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Switch to keybase go-crypto (for some elliptic curve key) + test (#1925)

Browse source 
* Switch to keybase go-crypto (for some elliptic curve key) + test

* Use assert.NoError 

and add a little more context to failing test description

* Use assert.(No)Error everywhere 🌈

and assert.Error in place of .Nil/.NotNil
This commit is contained in:
Antoine GIRARD 2017-06-14 02:43:43 +02:00 committed by Lunny Xiao
parent 5e92b82ac6
commit 274149dd14
56 changed files with 10621 additions and 925 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

6
models/gpg_key.go
View file

@ -19,9 +19,9 @@ import (
"code.gitea.io/gitea/modules/log"
"github.com/go-xorm/xorm"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/packet"
"github.com/keybase/go-crypto/openpgp"
"github.com/keybase/go-crypto/openpgp/armor"
"github.com/keybase/go-crypto/openpgp/packet"
)
// GPGKey represents a GPG key.

41
models/gpg_key_test.go
View file

@ -43,7 +43,28 @@ MkM/fdpyc2hY7Dl/+qFmN5MG5yGmMpQcX+RNNR222ibNC1D3wg==
-----END PGP PUBLIC KEY BLOCK-----`
key, err := checkArmoredGPGKeyString(testGPGArmor)
assert.Nil(t, err, "Could not parse a valid GPG armored key", key)
assert.NoError(t, err, "Could not parse a valid GPG public armored rsa key", key)
//TODO verify value of key
}
func TestCheckArmoredbrainpoolP256r1GPGKeyString(t *testing.T) {
testGPGArmor := `-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v2
mFMEV6HwkhMJKyQDAwIIAQEHAgMEUsvJO/j5dFMRRj67qeZC9fSKBsGZdOHRj2+6
8wssmbUuLTfT/ZjIbExETyY8hFnURRGpD2Ifyz0cKjXcbXfJtrQTRm9vYmFyIDxm
b29AYmFyLmRlPoh/BBMTCAAnBQJZOsDIAhsDBQkJZgGABQsJCAcCBhUICQoLAgQW
AgMBAh4BAheAAAoJEGuJTd/DBMzmNVQA/2beUrv1yU4gyvCiPDEm3pK42cSfaL5D
muCtPCUg9hlWAP4yq6M78NW8STfsXgn6oeziMYiHSTmV14nOamLuwwDWM7hXBFeh
8JISCSskAwMCCAEBBwIDBG3A+XfINAZp1CTse2mRNgeUE5DbUtEpO8ALXKA1UQsQ
DLKq27b7zTgawgXIGUGP6mWsJ5oH7MNAJ/uKTsYmX40DAQgHiGcEGBMIAA8FAleh
8JICGwwFCQlmAYAACgkQa4lN38MEzOZwKAD/QKyerAgcvzzLaqvtap3XvpYcw9tc
OyjLLnFQiVmq7kEA/0z0CQe3ZQiQIq5zrs7Nh1XRkFAo8GlU/SGC9XFFi722
=ZiSe
-----END PGP PUBLIC KEY BLOCK-----`
key, err := checkArmoredGPGKeyString(testGPGArmor)
assert.NoError(t, err, "Could not parse a valid GPG public armored brainpoolP256r1 key", key)
//TODO verify value of key
}
@ -79,11 +100,11 @@ MkM/fdpyc2hY7Dl/+qFmN5MG5yGmMpQcX+RNNR222ibNC1D3wg==
=i9b7
-----END PGP PUBLIC KEY BLOCK-----`
ekey, err := checkArmoredGPGKeyString(testGPGArmor)
assert.Nil(t, err, "Could not parse a valid GPG armored key", ekey)
assert.NoError(t, err, "Could not parse a valid GPG armored key", ekey)
pubkey := ekey.PrimaryKey
content, err := base64EncPubKey(pubkey)
assert.Nil(t, err, "Could not base64 encode a valid PublicKey content", ekey)
assert.NoError(t, err, "Could not base64 encode a valid PublicKey content", ekey)
key := &GPGKey{
KeyID: pubkey.KeyIdString(),
@ -144,21 +165,21 @@ Unknown GPG key with good email
`
//Reading Sign
goodSig, err := extractSignature(testGoodSigArmor)
assert.Nil(t, err, "Could not parse a valid GPG armored signature", testGoodSigArmor)
assert.NoError(t, err, "Could not parse a valid GPG armored signature", testGoodSigArmor)
badSig, err := extractSignature(testBadSigArmor)
assert.Nil(t, err, "Could not parse a valid GPG armored signature", testBadSigArmor)
assert.NoError(t, err, "Could not parse a valid GPG armored signature", testBadSigArmor)
//Generating hash of commit
goodHash, err := populateHash(goodSig.Hash, []byte(testGoodPayload))
assert.Nil(t, err, "Could not generate a valid hash of payload", testGoodPayload)
assert.NoError(t, err, "Could not generate a valid hash of payload", testGoodPayload)
badHash, err := populateHash(badSig.Hash, []byte(testBadPayload))
assert.Nil(t, err, "Could not generate a valid hash of payload", testBadPayload)
assert.NoError(t, err, "Could not generate a valid hash of payload", testBadPayload)
//Verify
err = verifySign(goodSig, goodHash, key)
assert.Nil(t, err, "Could not validate a good signature")
assert.NoError(t, err, "Could not validate a good signature")
err = verifySign(badSig, badHash, key)
assert.NotNil(t, err, "Validate a bad signature")
assert.Error(t, err, "Validate a bad signature")
err = verifySign(goodSig, goodHash, cannotsignkey)
assert.NotNil(t, err, "Validate a bad signature with a kay that can not sign")
assert.Error(t, err, "Validate a bad signature with a kay that can not sign")
}

27
vendor/github.com/keybase/go-crypto/LICENSE generated vendored Normal file
View file

@ -0,0 +1,27 @@
Copyright (c) 2009 The Go Authors. All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* Redistributions in binary form must reproduce the above
copyright notice, this list of conditions and the following disclaimer
in the documentation and/or other materials provided with the
distribution.
* Neither the name of Google Inc. nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

22
vendor/github.com/keybase/go-crypto/PATENTS generated vendored Normal file
View file

@ -0,0 +1,22 @@
Additional IP Rights Grant (Patents)
"This implementation" means the copyrightable works distributed by
Google as part of the Go project.
Google hereby grants to You a perpetual, worldwide, non-exclusive,
no-charge, royalty-free, irrevocable (except as stated in this section)
patent license to make, have made, use, offer to sell, sell, import,
transfer and otherwise run, modify and propagate the contents of this
implementation of Go, where such license applies only to those patent
claims, both currently owned or controlled by Google and acquired in
the future, licensable by Google that are necessarily infringed by this
implementation of Go. This grant does not include claims that would be
infringed only as a consequence of further modification of this
implementation. If you or your agent or exclusive licensee institute or
order or agree to the institution of patent litigation against any
entity (including a cross-claim or counterclaim in a lawsuit) alleging
that this implementation of Go or any code incorporated within this
implementation of Go constitutes direct or contributory patent
infringement, or inducement of patent infringement, then any patent
rights granted to you under this License for this implementation of Go
shall terminate as of the date such litigation is filed.

134
vendor/github.com/keybase/go-crypto/brainpool/brainpool.go generated vendored Normal file
View file

@ -0,0 +1,134 @@
// Package brainpool implements Brainpool elliptic curves.
// Implementation of rcurves is from github.com/ebfe/brainpool
// Note that these curves are implemented with naive, non-constant time operations
// and are likely not suitable for enviroments where timing attacks are a concern.
package brainpool
import (
"crypto/elliptic"
"math/big"
"sync"
)
var (
once sync.Once
p256t1, p384t1, p512t1 *elliptic.CurveParams
p256r1, p384r1, p512r1 *rcurve
)
func initAll() {
initP256t1()
initP384t1()
initP512t1()
initP256r1()
initP384r1()
initP512r1()
}
func initP256t1() {
p256t1 = &elliptic.CurveParams{Name: "brainpoolP256t1"}
p256t1.P, _ = new(big.Int).SetString("A9FB57DBA1EEA9BC3E660A909D838D726E3BF623D52620282013481D1F6E5377", 16)
p256t1.N, _ = new(big.Int).SetString("A9FB57DBA1EEA9BC3E660A909D838D718C397AA3B561A6F7901E0E82974856A7", 16)
p256t1.B, _ = new(big.Int).SetString("662C61C430D84EA4FE66A7733D0B76B7BF93EBC4AF2F49256AE58101FEE92B04", 16)
p256t1.Gx, _ = new(big.Int).SetString("A3E8EB3CC1CFE7B7732213B23A656149AFA142C47AAFBC2B79A191562E1305F4", 16)
p256t1.Gy, _ = new(big.Int).SetString("2D996C823439C56D7F7B22E14644417E69BCB6DE39D027001DABE8F35B25C9BE", 16)
p256t1.BitSize = 256
}
func initP256r1() {
twisted := p256t1
params := &elliptic.CurveParams{
Name: "brainpoolP256r1",
P: twisted.P,
N: twisted.N,
BitSize: twisted.BitSize,
}
params.Gx, _ = new(big.Int).SetString("8BD2AEB9CB7E57CB2C4B482FFC81B7AFB9DE27E1E3BD23C23A4453BD9ACE3262", 16)
params.Gy, _ = new(big.Int).SetString("547EF835C3DAC4FD97F8461A14611DC9C27745132DED8E545C1D54C72F046997", 16)
z, _ := new(big.Int).SetString("3E2D4BD9597B58639AE7AA669CAB9837CF5CF20A2C852D10F655668DFC150EF0", 16)
p256r1 = newrcurve(twisted, params, z)
}
func initP384t1() {
p384t1 = &elliptic.CurveParams{Name: "brainpoolP384t1"}
p384t1.P, _ = new(big.Int).SetString("8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B412B1DA197FB71123ACD3A729901D1A71874700133107EC53", 16)
p384t1.N, _ = new(big.Int).SetString("8CB91E82A3386D280F5D6F7E50E641DF152F7109ED5456B31F166E6CAC0425A7CF3AB6AF6B7FC3103B883202E9046565", 16)
p384t1.B, _ = new(big.Int).SetString("7F519EADA7BDA81BD826DBA647910F8C4B9346ED8CCDC64E4B1ABD11756DCE1D2074AA263B88805CED70355A33B471EE", 16)
p384t1.Gx, _ = new(big.Int).SetString("18DE98B02DB9A306F2AFCD7235F72A819B80AB12EBD653172476FECD462AABFFC4FF191B946A5F54D8D0AA2F418808CC", 16)
p384t1.Gy, _ = new(big.Int).SetString("25AB056962D30651A114AFD2755AD336747F93475B7A1FCA3B88F2B6A208CCFE469408584DC2B2912675BF5B9E582928", 16)
p384t1.BitSize = 384
}
func initP384r1() {
twisted := p384t1
params := &elliptic.CurveParams{
Name: "brainpoolP384r1",
P: twisted.P,
N: twisted.N,
BitSize: twisted.BitSize,
}
params.Gx, _ = new(big.Int).SetString("1D1C64F068CF45FFA2A63A81B7C13F6B8847A3E77EF14FE3DB7FCAFE0CBD10E8E826E03436D646AAEF87B2E247D4AF1E", 16)
params.Gy, _ = new(big.Int).SetString("8ABE1D7520F9C2A45CB1EB8E95CFD55262B70B29FEEC5864E19C054FF99129280E4646217791811142820341263C5315", 16)
z, _ := new(big.Int).SetString("41DFE8DD399331F7166A66076734A89CD0D2BCDB7D068E44E1F378F41ECBAE97D2D63DBC87BCCDDCCC5DA39E8589291C", 16)
p384r1 = newrcurve(twisted, params, z)
}
func initP512t1() {
p512t1 = &elliptic.CurveParams{Name: "brainpoolP512t1"}
p512t1.P, _ = new(big.Int).SetString("AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA703308717D4D9B009BC66842AECDA12AE6A380E62881FF2F2D82C68528AA6056583A48F3", 16)
p512t1.N, _ = new(big.Int).SetString("AADD9DB8DBE9C48B3FD4E6AE33C9FC07CB308DB3B3C9D20ED6639CCA70330870553E5C414CA92619418661197FAC10471DB1D381085DDADDB58796829CA90069", 16)
p512t1.B, _ = new(big.Int).SetString("7CBBBCF9441CFAB76E1890E46884EAE321F70C0BCB4981527897504BEC3E36A62BCDFA2304976540F6450085F2DAE145C22553B465763689180EA2571867423E", 16)
p512t1.Gx, _ = new(big.Int).SetString("640ECE5C12788717B9C1BA06CBC2A6FEBA85842458C56DDE9DB1758D39C0313D82BA51735CDB3EA499AA77A7D6943A64F7A3F25FE26F06B51BAA2696FA9035DA", 16)
p512t1.Gy, _ = new(big.Int).SetString("5B534BD595F5AF0FA2C892376C84ACE1BB4E3019B71634C01131159CAE03CEE9D9932184BEEF216BD71DF2DADF86A627306ECFF96DBB8BACE198B61E00F8B332", 16)
p512t1.BitSize = 512
}
func initP512r1() {
twisted := p512t1
params := &elliptic.CurveParams{
Name: "brainpoolP512r1",
P: twisted.P,
N: twisted.N,
BitSize: twisted.BitSize,
}
params.Gx, _ = new(big.Int).SetString("81AEE4BDD82ED9645A21322E9C4C6A9385ED9F70B5D916C1B43B62EEF4D0098EFF3B1F78E2D0D48D50D1687B93B97D5F7C6D5047406A5E688B352209BCB9F822", 16)
params.Gy, _ = new(big.Int).SetString("7DDE385D566332ECC0EABFA9CF7822FDF209F70024A57B1AA000C55B881F8111B2DCDE494A5F485E5BCA4BD88A2763AED1CA2B2FA8F0540678CD1E0F3AD80892", 16)
z, _ := new(big.Int).SetString("12EE58E6764838B69782136F0F2D3BA06E27695716054092E60A80BEDB212B64E585D90BCE13761F85C3F1D2A64E3BE8FEA2220F01EBA5EEB0F35DBD29D922AB", 16)
p512r1 = newrcurve(twisted, params, z)
}
// P256t1 returns a Curve which implements Brainpool P256t1 (see RFC 5639, section 3.4)
func P256t1() elliptic.Curve {
once.Do(initAll)
return p256t1
}
// P256r1 returns a Curve which implements Brainpool P256r1 (see RFC 5639, section 3.4)
func P256r1() elliptic.Curve {
once.Do(initAll)
return p256r1
}
// P384t1 returns a Curve which implements Brainpool P384t1 (see RFC 5639, section 3.6)
func P384t1() elliptic.Curve {
once.Do(initAll)
return p384t1
}
// P384r1 returns a Curve which implements Brainpool P384r1 (see RFC 5639, section 3.6)
func P384r1() elliptic.Curve {
once.Do(initAll)
return p384r1
}
// P512t1 returns a Curve which implements Brainpool P512t1 (see RFC 5639, section 3.7)
func P512t1() elliptic.Curve {
once.Do(initAll)
return p512t1
}
// P512r1 returns a Curve which implements Brainpool P512r1 (see RFC 5639, section 3.7)
func P512r1() elliptic.Curve {
once.Do(initAll)
return p512r1
}

83
vendor/github.com/keybase/go-crypto/brainpool/rcurve.go generated vendored Normal file
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@ -0,0 +1,83 @@
package brainpool
import (
"crypto/elliptic"
"math/big"
)
var _ elliptic.Curve = (*rcurve)(nil)
type rcurve struct {
twisted elliptic.Curve
params *elliptic.CurveParams
z *big.Int
zinv *big.Int
z2 *big.Int
z3 *big.Int
zinv2 *big.Int
zinv3 *big.Int
}
var (
two = big.NewInt(2)
three = big.NewInt(3)
)
func newrcurve(twisted elliptic.Curve, params *elliptic.CurveParams, z *big.Int) *rcurve {
zinv := new(big.Int).ModInverse(z, params.P)
return &rcurve{
twisted: twisted,
params: params,
z: z,
zinv: zinv,
z2: new(big.Int).Exp(z, two, params.P),
z3: new(big.Int).Exp(z, three, params.P),
zinv2: new(big.Int).Exp(zinv, two, params.P),
zinv3: new(big.Int).Exp(zinv, three, params.P),
}
}
func (curve *rcurve) toTwisted(x, y *big.Int) (*big.Int, *big.Int) {
var tx, ty big.Int
tx.Mul(x, curve.z2)
tx.Mod(&tx, curve.params.P)
ty.Mul(y, curve.z3)
ty.Mod(&ty, curve.params.P)
return &tx, &ty
}
func (curve *rcurve) fromTwisted(tx, ty *big.Int) (*big.Int, *big.Int) {
var x, y big.Int
x.Mul(tx, curve.zinv2)
x.Mod(&x, curve.params.P)
y.Mul(ty, curve.zinv3)
y.Mod(&y, curve.params.P)
return &x, &y
}
func (curve *rcurve) Params() *elliptic.CurveParams {
return curve.params
}
func (curve *rcurve) IsOnCurve(x, y *big.Int) bool {
return curve.twisted.IsOnCurve(curve.toTwisted(x, y))
}
func (curve *rcurve) Add(x1, y1, x2, y2 *big.Int) (x, y *big.Int) {
tx1, ty1 := curve.toTwisted(x1, y1)
tx2, ty2 := curve.toTwisted(x2, y2)
return curve.fromTwisted(curve.twisted.Add(tx1, ty1, tx2, ty2))
}
func (curve *rcurve) Double(x1, y1 *big.Int) (x, y *big.Int) {
return curve.fromTwisted(curve.twisted.Double(curve.toTwisted(x1, y1)))
}
func (curve *rcurve) ScalarMult(x1, y1 *big.Int, scalar []byte) (x, y *big.Int) {
tx1, ty1 := curve.toTwisted(x1, y1)
return curve.fromTwisted(curve.twisted.ScalarMult(tx1, ty1, scalar))
}
func (curve *rcurve) ScalarBaseMult(scalar []byte) (x, y *big.Int) {
return curve.fromTwisted(curve.twisted.ScalarBaseMult(scalar))
}

2
vendor/golang.org/x/crypto/cast5/cast5.go → vendor/github.com/keybase/go-crypto/cast5/cast5.go generated vendored
View file

@ -4,7 +4,7 @@
// Package cast5 implements CAST5, as defined in RFC 2144. CAST5 is a common
// OpenPGP cipher.
package cast5 // import "golang.org/x/crypto/cast5"
package cast5
import "errors"

20
vendor/github.com/keybase/go-crypto/curve25519/const_amd64.s generated vendored Normal file
View file

@ -0,0 +1,20 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
// +build amd64,!gccgo,!appengine
DATA ·REDMASK51(SB)/8, $0x0007FFFFFFFFFFFF
GLOBL ·REDMASK51(SB), 8, $8
DATA ·_121666_213(SB)/8, $996687872
GLOBL ·_121666_213(SB), 8, $8
DATA ·_2P0(SB)/8, $0xFFFFFFFFFFFDA
GLOBL ·_2P0(SB), 8, $8
DATA ·_2P1234(SB)/8, $0xFFFFFFFFFFFFE
GLOBL ·_2P1234(SB), 8, $8

88
vendor/github.com/keybase/go-crypto/curve25519/cswap_amd64.s generated vendored Normal file
View file

@ -0,0 +1,88 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
// +build amd64,!gccgo,!appengine
// func cswap(inout *[5]uint64, v uint64)
TEXT ·cswap(SB),7,$0
MOVQ inout+0(FP),DI
MOVQ v+8(FP),SI
CMPQ SI,$1
MOVQ 0(DI),SI
MOVQ 80(DI),DX
MOVQ 8(DI),CX
MOVQ 88(DI),R8
MOVQ SI,R9
CMOVQEQ DX,SI
CMOVQEQ R9,DX
MOVQ CX,R9
CMOVQEQ R8,CX
CMOVQEQ R9,R8
MOVQ SI,0(DI)
MOVQ DX,80(DI)
MOVQ CX,8(DI)
MOVQ R8,88(DI)
MOVQ 16(DI),SI
MOVQ 96(DI),DX
MOVQ 24(DI),CX
MOVQ 104(DI),R8
MOVQ SI,R9
CMOVQEQ DX,SI
CMOVQEQ R9,DX
MOVQ CX,R9
CMOVQEQ R8,CX
CMOVQEQ R9,R8
MOVQ SI,16(DI)
MOVQ DX,96(DI)
MOVQ CX,24(DI)
MOVQ R8,104(DI)
MOVQ 32(DI),SI
MOVQ 112(DI),DX
MOVQ 40(DI),CX
MOVQ 120(DI),R8
MOVQ SI,R9
CMOVQEQ DX,SI
CMOVQEQ R9,DX
MOVQ CX,R9
CMOVQEQ R8,CX
CMOVQEQ R9,R8
MOVQ SI,32(DI)
MOVQ DX,112(DI)
MOVQ CX,40(DI)
MOVQ R8,120(DI)
MOVQ 48(DI),SI
MOVQ 128(DI),DX
MOVQ 56(DI),CX
MOVQ 136(DI),R8
MOVQ SI,R9
CMOVQEQ DX,SI
CMOVQEQ R9,DX
MOVQ CX,R9
CMOVQEQ R8,CX
CMOVQEQ R9,R8
MOVQ SI,48(DI)
MOVQ DX,128(DI)
MOVQ CX,56(DI)
MOVQ R8,136(DI)
MOVQ 64(DI),SI
MOVQ 144(DI),DX
MOVQ 72(DI),CX
MOVQ 152(DI),R8
MOVQ SI,R9
CMOVQEQ DX,SI
CMOVQEQ R9,DX
MOVQ CX,R9
CMOVQEQ R8,CX
CMOVQEQ R9,R8
MOVQ SI,64(DI)
MOVQ DX,144(DI)
MOVQ CX,72(DI)
MOVQ R8,152(DI)
MOVQ DI,AX
MOVQ SI,DX
RET

841
vendor/github.com/keybase/go-crypto/curve25519/curve25519.go generated vendored Normal file
View file

@ -0,0 +1,841 @@
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// We have a implementation in amd64 assembly so this code is only run on
// non-amd64 platforms. The amd64 assembly does not support gccgo.
// +build !amd64 gccgo appengine
package curve25519
// This code is a port of the public domain, "ref10" implementation of
// curve25519 from SUPERCOP 20130419 by D. J. Bernstein.
// fieldElement represents an element of the field GF(2^255 - 19). An element
// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77
// t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on
// context.
type fieldElement [10]int32
func feZero(fe *fieldElement) {
for i := range fe {
fe[i] = 0
}
}
func feOne(fe *fieldElement) {
feZero(fe)
fe[0] = 1
}
func feAdd(dst, a, b *fieldElement) {
for i := range dst {
dst[i] = a[i] + b[i]
}
}
func feSub(dst, a, b *fieldElement) {
for i := range dst {
dst[i] = a[i] - b[i]
}
}
func feCopy(dst, src *fieldElement) {
for i := range dst {
dst[i] = src[i]
}
}
// feCSwap replaces (f,g) with (g,f) if b == 1; replaces (f,g) with (f,g) if b == 0.
//
// Preconditions: b in {0,1}.
func feCSwap(f, g *fieldElement, b int32) {
var x fieldElement
b = -b
for i := range x {
x[i] = b & (f[i] ^ g[i])
}
for i := range f {
f[i] ^= x[i]
}
for i := range g {
g[i] ^= x[i]
}
}
// load3 reads a 24-bit, little-endian value from in.
func load3(in []byte) int64 {
var r int64
r = int64(in[0])
r |= int64(in[1]) << 8
r |= int64(in[2]) << 16
return r
}
// load4 reads a 32-bit, little-endian value from in.
func load4(in []byte) int64 {
var r int64
r = int64(in[0])
r |= int64(in[1]) << 8
r |= int64(in[2]) << 16
r |= int64(in[3]) << 24
return r
}
func feFromBytes(dst *fieldElement, src *[32]byte) {
h0 := load4(src[:])
h1 := load3(src[4:]) << 6
h2 := load3(src[7:]) << 5
h3 := load3(src[10:]) << 3
h4 := load3(src[13:]) << 2
h5 := load4(src[16:])
h6 := load3(src[20:]) << 7
h7 := load3(src[23:]) << 5
h8 := load3(src[26:]) << 4
h9 := load3(src[29:]) << 2
var carry [10]int64
carry[9] = (h9 + 1<<24) >> 25
h0 += carry[9] * 19
h9 -= carry[9] << 25
carry[1] = (h1 + 1<<24) >> 25
h2 += carry[1]
h1 -= carry[1] << 25
carry[3] = (h3 + 1<<24) >> 25
h4 += carry[3]
h3 -= carry[3] << 25
carry[5] = (h5 + 1<<24) >> 25
h6 += carry[5]
h5 -= carry[5] << 25
carry[7] = (h7 + 1<<24) >> 25
h8 += carry[7]
h7 -= carry[7] << 25
carry[0] = (h0 + 1<<25) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
carry[2] = (h2 + 1<<25) >> 26
h3 += carry[2]
h2 -= carry[2] << 26
carry[4] = (h4 + 1<<25) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
carry[6] = (h6 + 1<<25) >> 26
h7 += carry[6]
h6 -= carry[6] << 26
carry[8] = (h8 + 1<<25) >> 26
h9 += carry[8]
h8 -= carry[8] << 26
dst[0] = int32(h0)
dst[1] = int32(h1)
dst[2] = int32(h2)
dst[3] = int32(h3)
dst[4] = int32(h4)
dst[5] = int32(h5)
dst[6] = int32(h6)
dst[7] = int32(h7)
dst[8] = int32(h8)
dst[9] = int32(h9)
}
// feToBytes marshals h to s.
// Preconditions:
// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
//
// Write p=2^255-19; q=floor(h/p).
// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))).
//
// Proof:
// Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4.
// Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4.
//
// Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9).
// Then 0<y<1.
//
// Write r=h-pq.
// Have 0<=r<=p-1=2^255-20.
// Thus 0<=r+19(2^-255)r<r+19(2^-255)2^255<=2^255-1.
//
// Write x=r+19(2^-255)r+y.
// Then 0<x<2^255 so floor(2^(-255)x) = 0 so floor(q+2^(-255)x) = q.
//
// Have q+2^(-255)x = 2^(-255)(h + 19 2^(-25) h9 + 2^(-1))
// so floor(2^(-255)(h + 19 2^(-25) h9 + 2^(-1))) = q.
func feToBytes(s *[32]byte, h *fieldElement) {
var carry [10]int32
q := (19*h[9] + (1 << 24)) >> 25
q = (h[0] + q) >> 26
q = (h[1] + q) >> 25
q = (h[2] + q) >> 26
q = (h[3] + q) >> 25
q = (h[4] + q) >> 26
q = (h[5] + q) >> 25
q = (h[6] + q) >> 26
q = (h[7] + q) >> 25
q = (h[8] + q) >> 26
q = (h[9] + q) >> 25
// Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20.
h[0] += 19 * q
// Goal: Output h-2^255 q, which is between 0 and 2^255-20.
carry[0] = h[0] >> 26
h[1] += carry[0]
h[0] -= carry[0] << 26
carry[1] = h[1] >> 25
h[2] += carry[1]
h[1] -= carry[1] << 25
carry[2] = h[2] >> 26
h[3] += carry[2]
h[2] -= carry[2] << 26
carry[3] = h[3] >> 25
h[4] += carry[3]
h[3] -= carry[3] << 25
carry[4] = h[4] >> 26
h[5] += carry[4]
h[4] -= carry[4] << 26
carry[5] = h[5] >> 25
h[6] += carry[5]
h[5] -= carry[5] << 25
carry[6] = h[6] >> 26
h[7] += carry[6]
h[6] -= carry[6] << 26
carry[7] = h[7] >> 25
h[8] += carry[7]
h[7] -= carry[7] << 25
carry[8] = h[8] >> 26
h[9] += carry[8]
h[8] -= carry[8] << 26
carry[9] = h[9] >> 25
h[9] -= carry[9] << 25
// h10 = carry9
// Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20.
// Have h[0]+...+2^230 h[9] between 0 and 2^255-1;
// evidently 2^255 h10-2^255 q = 0.
// Goal: Output h[0]+...+2^230 h[9].
s[0] = byte(h[0] >> 0)
s[1] = byte(h[0] >> 8)
s[2] = byte(h[0] >> 16)
s[3] = byte((h[0] >> 24) | (h[1] << 2))
s[4] = byte(h[1] >> 6)
s[5] = byte(h[1] >> 14)
s[6] = byte((h[1] >> 22) | (h[2] << 3))
s[7] = byte(h[2] >> 5)
s[8] = byte(h[2] >> 13)
s[9] = byte((h[2] >> 21) | (h[3] << 5))
s[10] = byte(h[3] >> 3)
s[11] = byte(h[3] >> 11)
s[12] = byte((h[3] >> 19) | (h[4] << 6))
s[13] = byte(h[4] >> 2)
s[14] = byte(h[4] >> 10)
s[15] = byte(h[4] >> 18)
s[16] = byte(h[5] >> 0)
s[17] = byte(h[5] >> 8)
s[18] = byte(h[5] >> 16)
s[19] = byte((h[5] >> 24) | (h[6] << 1))
s[20] = byte(h[6] >> 7)
s[21] = byte(h[6] >> 15)
s[22] = byte((h[6] >> 23) | (h[7] << 3))
s[23] = byte(h[7] >> 5)
s[24] = byte(h[7] >> 13)
s[25] = byte((h[7] >> 21) | (h[8] << 4))
s[26] = byte(h[8] >> 4)
s[27] = byte(h[8] >> 12)
s[28] = byte((h[8] >> 20) | (h[9] << 6))
s[29] = byte(h[9] >> 2)
s[30] = byte(h[9] >> 10)
s[31] = byte(h[9] >> 18)
}
// feMul calculates h = f * g
// Can overlap h with f or g.
//
// Preconditions:
// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
// |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
//
// Postconditions:
// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
//
// Notes on implementation strategy:
//
// Using schoolbook multiplication.
// Karatsuba would save a little in some cost models.
//
// Most multiplications by 2 and 19 are 32-bit precomputations;
// cheaper than 64-bit postcomputations.
//
// There is one remaining multiplication by 19 in the carry chain;
// one *19 precomputation can be merged into this,
// but the resulting data flow is considerably less clean.
//
// There are 12 carries below.
// 10 of them are 2-way parallelizable and vectorizable.
// Can get away with 11 carries, but then data flow is much deeper.
//
// With tighter constraints on inputs can squeeze carries into int32.
func feMul(h, f, g *fieldElement) {
f0 := f[0]
f1 := f[1]
f2 := f[2]
f3 := f[3]
f4 := f[4]
f5 := f[5]
f6 := f[6]
f7 := f[7]
f8 := f[8]
f9 := f[9]
g0 := g[0]
g1 := g[1]
g2 := g[2]
g3 := g[3]
g4 := g[4]
g5 := g[5]
g6 := g[6]
g7 := g[7]
g8 := g[8]
g9 := g[9]
g1_19 := 19 * g1 // 1.4*2^29
g2_19 := 19 * g2 // 1.4*2^30; still ok
g3_19 := 19 * g3
g4_19 := 19 * g4
g5_19 := 19 * g5
g6_19 := 19 * g6
g7_19 := 19 * g7
g8_19 := 19 * g8
g9_19 := 19 * g9
f1_2 := 2 * f1
f3_2 := 2 * f3
f5_2 := 2 * f5
f7_2 := 2 * f7
f9_2 := 2 * f9
f0g0 := int64(f0) * int64(g0)
f0g1 := int64(f0) * int64(g1)
f0g2 := int64(f0) * int64(g2)
f0g3 := int64(f0) * int64(g3)
f0g4 := int64(f0) * int64(g4)
f0g5 := int64(f0) * int64(g5)
f0g6 := int64(f0) * int64(g6)
f0g7 := int64(f0) * int64(g7)
f0g8 := int64(f0) * int64(g8)
f0g9 := int64(f0) * int64(g9)
f1g0 := int64(f1) * int64(g0)
f1g1_2 := int64(f1_2) * int64(g1)
f1g2 := int64(f1) * int64(g2)
f1g3_2 := int64(f1_2) * int64(g3)
f1g4 := int64(f1) * int64(g4)
f1g5_2 := int64(f1_2) * int64(g5)
f1g6 := int64(f1) * int64(g6)
f1g7_2 := int64(f1_2) * int64(g7)
f1g8 := int64(f1) * int64(g8)
f1g9_38 := int64(f1_2) * int64(g9_19)
f2g0 := int64(f2) * int64(g0)
f2g1 := int64(f2) * int64(g1)
f2g2 := int64(f2) * int64(g2)
f2g3 := int64(f2) * int64(g3)
f2g4 := int64(f2) * int64(g4)
f2g5 := int64(f2) * int64(g5)
f2g6 := int64(f2) * int64(g6)
f2g7 := int64(f2) * int64(g7)
f2g8_19 := int64(f2) * int64(g8_19)
f2g9_19 := int64(f2) * int64(g9_19)
f3g0 := int64(f3) * int64(g0)
f3g1_2 := int64(f3_2) * int64(g1)
f3g2 := int64(f3) * int64(g2)
f3g3_2 := int64(f3_2) * int64(g3)
f3g4 := int64(f3) * int64(g4)
f3g5_2 := int64(f3_2) * int64(g5)
f3g6 := int64(f3) * int64(g6)
f3g7_38 := int64(f3_2) * int64(g7_19)
f3g8_19 := int64(f3) * int64(g8_19)
f3g9_38 := int64(f3_2) * int64(g9_19)
f4g0 := int64(f4) * int64(g0)
f4g1 := int64(f4) * int64(g1)
f4g2 := int64(f4) * int64(g2)
f4g3 := int64(f4) * int64(g3)
f4g4 := int64(f4) * int64(g4)
f4g5 := int64(f4) * int64(g5)
f4g6_19 := int64(f4) * int64(g6_19)
f4g7_19 := int64(f4) * int64(g7_19)
f4g8_19 := int64(f4) * int64(g8_19)
f4g9_19 := int64(f4) * int64(g9_19)
f5g0 := int64(f5) * int64(g0)
f5g1_2 := int64(f5_2) * int64(g1)
f5g2 := int64(f5) * int64(g2)
f5g3_2 := int64(f5_2) * int64(g3)
f5g4 := int64(f5) * int64(g4)
f5g5_38 := int64(f5_2) * int64(g5_19)
f5g6_19 := int64(f5) * int64(g6_19)
f5g7_38 := int64(f5_2) * int64(g7_19)
f5g8_19 := int64(f5) * int64(g8_19)
f5g9_38 := int64(f5_2) * int64(g9_19)
f6g0 := int64(f6) * int64(g0)
f6g1 := int64(f6) * int64(g1)
f6g2 := int64(f6) * int64(g2)
f6g3 := int64(f6) * int64(g3)
f6g4_19 := int64(f6) * int64(g4_19)
f6g5_19 := int64(f6) * int64(g5_19)
f6g6_19 := int64(f6) * int64(g6_19)
f6g7_19 := int64(f6) * int64(g7_19)
f6g8_19 := int64(f6) * int64(g8_19)
f6g9_19 := int64(f6) * int64(g9_19)
f7g0 := int64(f7) * int64(g0)
f7g1_2 := int64(f7_2) * int64(g1)
f7g2 := int64(f7) * int64(g2)
f7g3_38 := int64(f7_2) * int64(g3_19)
f7g4_19 := int64(f7) * int64(g4_19)
f7g5_38 := int64(f7_2) * int64(g5_19)
f7g6_19 := int64(f7) * int64(g6_19)
f7g7_38 := int64(f7_2) * int64(g7_19)
f7g8_19 := int64(f7) * int64(g8_19)
f7g9_38 := int64(f7_2) * int64(g9_19)
f8g0 := int64(f8) * int64(g0)
f8g1 := int64(f8) * int64(g1)
f8g2_19 := int64(f8) * int64(g2_19)
f8g3_19 := int64(f8) * int64(g3_19)
f8g4_19 := int64(f8) * int64(g4_19)
f8g5_19 := int64(f8) * int64(g5_19)
f8g6_19 := int64(f8) * int64(g6_19)
f8g7_19 := int64(f8) * int64(g7_19)
f8g8_19 := int64(f8) * int64(g8_19)
f8g9_19 := int64(f8) * int64(g9_19)
f9g0 := int64(f9) * int64(g0)
f9g1_38 := int64(f9_2) * int64(g1_19)
f9g2_19 := int64(f9) * int64(g2_19)
f9g3_38 := int64(f9_2) * int64(g3_19)
f9g4_19 := int64(f9) * int64(g4_19)
f9g5_38 := int64(f9_2) * int64(g5_19)
f9g6_19 := int64(f9) * int64(g6_19)
f9g7_38 := int64(f9_2) * int64(g7_19)
f9g8_19 := int64(f9) * int64(g8_19)
f9g9_38 := int64(f9_2) * int64(g9_19)
h0 := f0g0 + f1g9_38 + f2g8_19 + f3g7_38 + f4g6_19 + f5g5_38 + f6g4_19 + f7g3_38 + f8g2_19 + f9g1_38
h1 := f0g1 + f1g0 + f2g9_19 + f3g8_19 + f4g7_19 + f5g6_19 + f6g5_19 + f7g4_19 + f8g3_19 + f9g2_19
h2 := f0g2 + f1g1_2 + f2g0 + f3g9_38 + f4g8_19 + f5g7_38 + f6g6_19 + f7g5_38 + f8g4_19 + f9g3_38
h3 := f0g3 + f1g2 + f2g1 + f3g0 + f4g9_19 + f5g8_19 + f6g7_19 + f7g6_19 + f8g5_19 + f9g4_19
h4 := f0g4 + f1g3_2 + f2g2 + f3g1_2 + f4g0 + f5g9_38 + f6g8_19 + f7g7_38 + f8g6_19 + f9g5_38
h5 := f0g5 + f1g4 + f2g3 + f3g2 + f4g1 + f5g0 + f6g9_19 + f7g8_19 + f8g7_19 + f9g6_19
h6 := f0g6 + f1g5_2 + f2g4 + f3g3_2 + f4g2 + f5g1_2 + f6g0 + f7g9_38 + f8g8_19 + f9g7_38
h7 := f0g7 + f1g6 + f2g5 + f3g4 + f4g3 + f5g2 + f6g1 + f7g0 + f8g9_19 + f9g8_19
h8 := f0g8 + f1g7_2 + f2g6 + f3g5_2 + f4g4 + f5g3_2 + f6g2 + f7g1_2 + f8g0 + f9g9_38
h9 := f0g9 + f1g8 + f2g7 + f3g6 + f4g5 + f5g4 + f6g3 + f7g2 + f8g1 + f9g0
var carry [10]int64
// |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38))
// i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8
// |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19))
// i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9
carry[0] = (h0 + (1 << 25)) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
carry[4] = (h4 + (1 << 25)) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
// |h0| <= 2^25
// |h4| <= 2^25
// |h1| <= 1.51*2^58
// |h5| <= 1.51*2^58
carry[1] = (h1 + (1 << 24)) >> 25
h2 += carry[1]
h1 -= carry[1] << 25
carry[5] = (h5 + (1 << 24)) >> 25
h6 += carry[5]
h5 -= carry[5] << 25
// |h1| <= 2^24; from now on fits into int32
// |h5| <= 2^24; from now on fits into int32
// |h2| <= 1.21*2^59
// |h6| <= 1.21*2^59
carry[2] = (h2 + (1 << 25)) >> 26
h3 += carry[2]
h2 -= carry[2] << 26
carry[6] = (h6 + (1 << 25)) >> 26
h7 += carry[6]
h6 -= carry[6] << 26
// |h2| <= 2^25; from now on fits into int32 unchanged
// |h6| <= 2^25; from now on fits into int32 unchanged
// |h3| <= 1.51*2^58
// |h7| <= 1.51*2^58
carry[3] = (h3 + (1 << 24)) >> 25
h4 += carry[3]
h3 -= carry[3] << 25
carry[7] = (h7 + (1 << 24)) >> 25
h8 += carry[7]
h7 -= carry[7] << 25
// |h3| <= 2^24; from now on fits into int32 unchanged
// |h7| <= 2^24; from now on fits into int32 unchanged
// |h4| <= 1.52*2^33
// |h8| <= 1.52*2^33
carry[4] = (h4 + (1 << 25)) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
carry[8] = (h8 + (1 << 25)) >> 26
h9 += carry[8]
h8 -= carry[8] << 26
// |h4| <= 2^25; from now on fits into int32 unchanged
// |h8| <= 2^25; from now on fits into int32 unchanged
// |h5| <= 1.01*2^24
// |h9| <= 1.51*2^58
carry[9] = (h9 + (1 << 24)) >> 25
h0 += carry[9] * 19
h9 -= carry[9] << 25
// |h9| <= 2^24; from now on fits into int32 unchanged
// |h0| <= 1.8*2^37
carry[0] = (h0 + (1 << 25)) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
// |h0| <= 2^25; from now on fits into int32 unchanged
// |h1| <= 1.01*2^24
h[0] = int32(h0)
h[1] = int32(h1)
h[2] = int32(h2)
h[3] = int32(h3)
h[4] = int32(h4)
h[5] = int32(h5)
h[6] = int32(h6)
h[7] = int32(h7)
h[8] = int32(h8)
h[9] = int32(h9)
}
// feSquare calculates h = f*f. Can overlap h with f.
//
// Preconditions:
// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
//
// Postconditions:
// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
func feSquare(h, f *fieldElement) {
f0 := f[0]
f1 := f[1]
f2 := f[2]
f3 := f[3]
f4 := f[4]
f5 := f[5]
f6 := f[6]
f7 := f[7]
f8 := f[8]
f9 := f[9]
f0_2 := 2 * f0
f1_2 := 2 * f1
f2_2 := 2 * f2
f3_2 := 2 * f3
f4_2 := 2 * f4
f5_2 := 2 * f5
f6_2 := 2 * f6
f7_2 := 2 * f7
f5_38 := 38 * f5 // 1.31*2^30
f6_19 := 19 * f6 // 1.31*2^30
f7_38 := 38 * f7 // 1.31*2^30
f8_19 := 19 * f8 // 1.31*2^30
f9_38 := 38 * f9 // 1.31*2^30
f0f0 := int64(f0) * int64(f0)
f0f1_2 := int64(f0_2) * int64(f1)
f0f2_2 := int64(f0_2) * int64(f2)
f0f3_2 := int64(f0_2) * int64(f3)
f0f4_2 := int64(f0_2) * int64(f4)
f0f5_2 := int64(f0_2) * int64(f5)
f0f6_2 := int64(f0_2) * int64(f6)
f0f7_2 := int64(f0_2) * int64(f7)
f0f8_2 := int64(f0_2) * int64(f8)
f0f9_2 := int64(f0_2) * int64(f9)
f1f1_2 := int64(f1_2) * int64(f1)
f1f2_2 := int64(f1_2) * int64(f2)
f1f3_4 := int64(f1_2) * int64(f3_2)
f1f4_2 := int64(f1_2) * int64(f4)
f1f5_4 := int64(f1_2) * int64(f5_2)
f1f6_2 := int64(f1_2) * int64(f6)
f1f7_4 := int64(f1_2) * int64(f7_2)
f1f8_2 := int64(f1_2) * int64(f8)
f1f9_76 := int64(f1_2) * int64(f9_38)
f2f2 := int64(f2) * int64(f2)
f2f3_2 := int64(f2_2) * int64(f3)
f2f4_2 := int64(f2_2) * int64(f4)
f2f5_2 := int64(f2_2) * int64(f5)
f2f6_2 := int64(f2_2) * int64(f6)
f2f7_2 := int64(f2_2) * int64(f7)
f2f8_38 := int64(f2_2) * int64(f8_19)
f2f9_38 := int64(f2) * int64(f9_38)
f3f3_2 := int64(f3_2) * int64(f3)
f3f4_2 := int64(f3_2) * int64(f4)
f3f5_4 := int64(f3_2) * int64(f5_2)
f3f6_2 := int64(f3_2) * int64(f6)
f3f7_76 := int64(f3_2) * int64(f7_38)
f3f8_38 := int64(f3_2) * int64(f8_19)
f3f9_76 := int64(f3_2) * int64(f9_38)
f4f4 := int64(f4) * int64(f4)
f4f5_2 := int64(f4_2) * int64(f5)
f4f6_38 := int64(f4_2) * int64(f6_19)
f4f7_38 := int64(f4) * int64(f7_38)
f4f8_38 := int64(f4_2) * int64(f8_19)
f4f9_38 := int64(f4) * int64(f9_38)
f5f5_38 := int64(f5) * int64(f5_38)
f5f6_38 := int64(f5_2) * int64(f6_19)
f5f7_76 := int64(f5_2) * int64(f7_38)
f5f8_38 := int64(f5_2) * int64(f8_19)
f5f9_76 := int64(f5_2) * int64(f9_38)
f6f6_19 := int64(f6) * int64(f6_19)
f6f7_38 := int64(f6) * int64(f7_38)
f6f8_38 := int64(f6_2) * int64(f8_19)
f6f9_38 := int64(f6) * int64(f9_38)
f7f7_38 := int64(f7) * int64(f7_38)
f7f8_38 := int64(f7_2) * int64(f8_19)
f7f9_76 := int64(f7_2) * int64(f9_38)
f8f8_19 := int64(f8) * int64(f8_19)
f8f9_38 := int64(f8) * int64(f9_38)
f9f9_38 := int64(f9) * int64(f9_38)
h0 := f0f0 + f1f9_76 + f2f8_38 + f3f7_76 + f4f6_38 + f5f5_38
h1 := f0f1_2 + f2f9_38 + f3f8_38 + f4f7_38 + f5f6_38
h2 := f0f2_2 + f1f1_2 + f3f9_76 + f4f8_38 + f5f7_76 + f6f6_19
h3 := f0f3_2 + f1f2_2 + f4f9_38 + f5f8_38 + f6f7_38
h4 := f0f4_2 + f1f3_4 + f2f2 + f5f9_76 + f6f8_38 + f7f7_38
h5 := f0f5_2 + f1f4_2 + f2f3_2 + f6f9_38 + f7f8_38
h6 := f0f6_2 + f1f5_4 + f2f4_2 + f3f3_2 + f7f9_76 + f8f8_19
h7 := f0f7_2 + f1f6_2 + f2f5_2 + f3f4_2 + f8f9_38
h8 := f0f8_2 + f1f7_4 + f2f6_2 + f3f5_4 + f4f4 + f9f9_38
h9 := f0f9_2 + f1f8_2 + f2f7_2 + f3f6_2 + f4f5_2
var carry [10]int64
carry[0] = (h0 + (1 << 25)) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
carry[4] = (h4 + (1 << 25)) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
carry[1] = (h1 + (1 << 24)) >> 25
h2 += carry[1]
h1 -= carry[1] << 25
carry[5] = (h5 + (1 << 24)) >> 25
h6 += carry[5]
h5 -= carry[5] << 25
carry[2] = (h2 + (1 << 25)) >> 26
h3 += carry[2]
h2 -= carry[2] << 26
carry[6] = (h6 + (1 << 25)) >> 26
h7 += carry[6]
h6 -= carry[6] << 26
carry[3] = (h3 + (1 << 24)) >> 25
h4 += carry[3]
h3 -= carry[3] << 25
carry[7] = (h7 + (1 << 24)) >> 25
h8 += carry[7]
h7 -= carry[7] << 25
carry[4] = (h4 + (1 << 25)) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
carry[8] = (h8 + (1 << 25)) >> 26
h9 += carry[8]
h8 -= carry[8] << 26
carry[9] = (h9 + (1 << 24)) >> 25
h0 += carry[9] * 19
h9 -= carry[9] << 25
carry[0] = (h0 + (1 << 25)) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
h[0] = int32(h0)
h[1] = int32(h1)
h[2] = int32(h2)
h[3] = int32(h3)
h[4] = int32(h4)
h[5] = int32(h5)
h[6] = int32(h6)
h[7] = int32(h7)
h[8] = int32(h8)
h[9] = int32(h9)
}
// feMul121666 calculates h = f * 121666. Can overlap h with f.
//
// Preconditions:
// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc.
//
// Postconditions:
// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc.
func feMul121666(h, f *fieldElement) {
h0 := int64(f[0]) * 121666
h1 := int64(f[1]) * 121666
h2 := int64(f[2]) * 121666
h3 := int64(f[3]) * 121666
h4 := int64(f[4]) * 121666
h5 := int64(f[5]) * 121666
h6 := int64(f[6]) * 121666
h7 := int64(f[7]) * 121666
h8 := int64(f[8]) * 121666
h9 := int64(f[9]) * 121666
var carry [10]int64
carry[9] = (h9 + (1 << 24)) >> 25
h0 += carry[9] * 19
h9 -= carry[9] << 25
carry[1] = (h1 + (1 << 24)) >> 25
h2 += carry[1]
h1 -= carry[1] << 25
carry[3] = (h3 + (1 << 24)) >> 25
h4 += carry[3]
h3 -= carry[3] << 25
carry[5] = (h5 + (1 << 24)) >> 25
h6 += carry[5]
h5 -= carry[5] << 25
carry[7] = (h7 + (1 << 24)) >> 25
h8 += carry[7]
h7 -= carry[7] << 25
carry[0] = (h0 + (1 << 25)) >> 26
h1 += carry[0]
h0 -= carry[0] << 26
carry[2] = (h2 + (1 << 25)) >> 26
h3 += carry[2]
h2 -= carry[2] << 26
carry[4] = (h4 + (1 << 25)) >> 26
h5 += carry[4]
h4 -= carry[4] << 26
carry[6] = (h6 + (1 << 25)) >> 26
h7 += carry[6]
h6 -= carry[6] << 26
carry[8] = (h8 + (1 << 25)) >> 26
h9 += carry[8]
h8 -= carry[8] << 26
h[0] = int32(h0)
h[1] = int32(h1)
h[2] = int32(h2)
h[3] = int32(h3)
h[4] = int32(h4)
h[5] = int32(h5)
h[6] = int32(h6)
h[7] = int32(h7)
h[8] = int32(h8)
h[9] = int32(h9)
}
// feInvert sets out = z^-1.
func feInvert(out, z *fieldElement) {
var t0, t1, t2, t3 fieldElement
var i int
feSquare(&t0, z)
for i = 1; i < 1; i++ {
feSquare(&t0, &t0)
}
feSquare(&t1, &t0)
for i = 1; i < 2; i++ {
feSquare(&t1, &t1)
}
feMul(&t1, z, &t1)
feMul(&t0, &t0, &t1)
feSquare(&t2, &t0)
for i = 1; i < 1; i++ {
feSquare(&t2, &t2)
}
feMul(&t1, &t1, &t2)
feSquare(&t2, &t1)
for i = 1; i < 5; i++ {
feSquare(&t2, &t2)
}
feMul(&t1, &t2, &t1)
feSquare(&t2, &t1)
for i = 1; i < 10; i++ {
feSquare(&t2, &t2)
}
feMul(&t2, &t2, &t1)
feSquare(&t3, &t2)
for i = 1; i < 20; i++ {
feSquare(&t3, &t3)
}
feMul(&t2, &t3, &t2)
feSquare(&t2, &t2)
for i = 1; i < 10; i++ {
feSquare(&t2, &t2)
}
feMul(&t1, &t2, &t1)
feSquare(&t2, &t1)
for i = 1; i < 50; i++ {
feSquare(&t2, &t2)
}
feMul(&t2, &t2, &t1)
feSquare(&t3, &t2)
for i = 1; i < 100; i++ {
feSquare(&t3, &t3)
}
feMul(&t2, &t3, &t2)
feSquare(&t2, &t2)
for i = 1; i < 50; i++ {
feSquare(&t2, &t2)
}
feMul(&t1, &t2, &t1)
feSquare(&t1, &t1)
for i = 1; i < 5; i++ {
feSquare(&t1, &t1)
}
feMul(out, &t1, &t0)
}
func scalarMult(out, in, base *[32]byte) {
var e [32]byte
copy(e[:], in[:])
e[0] &= 248
e[31] &= 127
e[31] |= 64
var x1, x2, z2, x3, z3, tmp0, tmp1 fieldElement
feFromBytes(&x1, base)
feOne(&x2)
feCopy(&x3, &x1)
feOne(&z3)
swap := int32(0)
for pos := 254; pos >= 0; pos-- {
b := e[pos/8] >> uint(pos&7)
b &= 1
swap ^= int32(b)
feCSwap(&x2, &x3, swap)
feCSwap(&z2, &z3, swap)
swap = int32(b)
feSub(&tmp0, &x3, &z3)
feSub(&tmp1, &x2, &z2)
feAdd(&x2, &x2, &z2)
feAdd(&z2, &x3, &z3)
feMul(&z3, &tmp0, &x2)
feMul(&z2, &z2, &tmp1)
feSquare(&tmp0, &tmp1)
feSquare(&tmp1, &x2)
feAdd(&x3, &z3, &z2)
feSub(&z2, &z3, &z2)
feMul(&x2, &tmp1, &tmp0)
feSub(&tmp1, &tmp1, &tmp0)
feSquare(&z2, &z2)
feMul121666(&z3, &tmp1)
feSquare(&x3, &x3)
feAdd(&tmp0, &tmp0, &z3)
feMul(&z3, &x1, &z2)
feMul(&z2, &tmp1, &tmp0)
}
feCSwap(&x2, &x3, swap)
feCSwap(&z2, &z3, swap)
feInvert(&z2, &z2)
feMul(&x2, &x2, &z2)
feToBytes(out, &x2)
}

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vendor/github.com/keybase/go-crypto/curve25519/curve_impl.go generated vendored Normal file
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package curve25519
import (
"crypto/elliptic"
"math/big"
"sync"
)
var cv25519 cv25519Curve
type cv25519Curve struct {
*elliptic.CurveParams
}
func copyReverse(dst []byte, src []byte) {
// Curve 25519 multiplication functions expect scalars in reverse
// order than PGP. To keep the curve25519Curve type consistent
// with other curves, we reverse it here.
for i, j := 0, len(src)-1; j >= 0; i, j = i+1, j-1 {
dst[i] = src[j]
}
}
func (cv25519Curve) ScalarMult(x1, y1 *big.Int, scalar []byte) (x, y *big.Int) {
// Assume y1 is 0 with cv25519.
var dst [32]byte
var x1Bytes [32]byte
var scalarBytes [32]byte
copy(x1Bytes[:], x1.Bytes()[:32])
copyReverse(scalarBytes[:], scalar[:32])
scalarMult(&dst, &scalarBytes, &x1Bytes)
x = new(big.Int).SetBytes(dst[:])
y = new(big.Int)
return x, y
}
func (cv25519Curve) ScalarBaseMult(scalar []byte) (x, y *big.Int) {
var dst [32]byte
var scalarBytes [32]byte
copyReverse(scalarBytes[:], scalar[:32])
scalarMult(&dst, &scalarBytes, &basePoint)
x = new(big.Int).SetBytes(dst[:])
y = new(big.Int)
return x, y
}
func (cv25519Curve) IsOnCurve(bigX, bigY *big.Int) bool {
return bigY.Sign() == 0 // bigY == 0 ?
}
// More information about 0x40 point format:
// https://tools.ietf.org/html/draft-koch-eddsa-for-openpgp-00#section-3
// In addition to uncompressed point format described here:
// https://tools.ietf.org/html/rfc6637#section-6
func (cv25519Curve) MarshalType40(x, y *big.Int) []byte {
byteLen := 32
ret := make([]byte, 1+byteLen)
ret[0] = 0x40
xBytes := x.Bytes()
copy(ret[1+byteLen-len(xBytes):], xBytes)
return ret
}
func (cv25519Curve) UnmarshalType40(data []byte) (x, y *big.Int) {
if len(data) != 1+32 {
return nil, nil
}
if data[0] != 0x40 {
return nil, nil
}
x = new(big.Int).SetBytes(data[1:])
// Any x is a valid curve point.
return x, new(big.Int)
}
// ToCurve25519 casts given elliptic.Curve type to Curve25519 type, or
// returns nil, false if cast was unsuccessful.
func ToCurve25519(cv elliptic.Curve) (cv25519Curve, bool) {
cv2, ok := cv.(cv25519Curve)
return cv2, ok
}
func initCv25519() {
cv25519.CurveParams = &elliptic.CurveParams{Name: "Curve 25519"}
// Some code relies on these parameters being available for
// checking Curve coordinate length. They should not be used
// directly for any calculations.
cv25519.P, _ = new (big.Int).SetString("7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffed", 16)
cv25519.N, _ = new (big.Int).SetString("1000000000000000000000000000000014def9dea2f79cd65812631a5cf5d3ed", 16)
cv25519.Gx, _ = new (big.Int).SetString("9", 16)
cv25519.Gy, _ = new (big.Int).SetString("20ae19a1b8a086b4e01edd2c7748d14c923d4d7e6d7c61b229e9c5a27eced3d9", 16)
cv25519.BitSize = 256
}
var initonce sync.Once
// Cv25519 returns a Curve which (partially) implements Cv25519. Only
// ScalarMult and ScalarBaseMult are valid for this curve. Add and
// Double should not be used.
func Cv25519() elliptic.Curve {
initonce.Do(initCv25519)
return cv25519
}
func (curve cv25519Curve) Params() *elliptic.CurveParams {
return curve.CurveParams
}

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vendor/github.com/keybase/go-crypto/curve25519/doc.go generated vendored Normal file
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package curve25519 provides an implementation of scalar multiplication on
// the elliptic curve known as curve25519. See http://cr.yp.to/ecdh.html
package curve25519
// basePoint is the x coordinate of the generator of the curve.
var basePoint = [32]byte{9, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
// ScalarMult sets dst to the product in*base where dst and base are the x
// coordinates of group points and all values are in little-endian form.
func ScalarMult(dst, in, base *[32]byte) {
scalarMult(dst, in, base)
}
// ScalarBaseMult sets dst to the product in*base where dst and base are the x
// coordinates of group points, base is the standard generator and all values
// are in little-endian form.
func ScalarBaseMult(dst, in *[32]byte) {
ScalarMult(dst, in, &basePoint)
}

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vendor/github.com/keybase/go-crypto/curve25519/freeze_amd64.s generated vendored Normal file
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
// +build amd64,!gccgo,!appengine
// func freeze(inout *[5]uint64)
TEXT ·freeze(SB),7,$96-8
MOVQ inout+0(FP), DI
MOVQ SP,R11
MOVQ $31,CX
NOTQ CX
ANDQ CX,SP
ADDQ $32,SP
MOVQ R11,0(SP)
MOVQ R12,8(SP)
MOVQ R13,16(SP)
MOVQ R14,24(SP)
MOVQ R15,32(SP)
MOVQ BX,40(SP)
MOVQ BP,48(SP)
MOVQ 0(DI),SI
MOVQ 8(DI),DX
MOVQ 16(DI),CX
MOVQ 24(DI),R8
MOVQ 32(DI),R9
MOVQ ·REDMASK51(SB),AX
MOVQ AX,R10
SUBQ $18,R10
MOVQ $3,R11
REDUCELOOP:
MOVQ SI,R12
SHRQ $51,R12
ANDQ AX,SI
ADDQ R12,DX
MOVQ DX,R12
SHRQ $51,R12
ANDQ AX,DX
ADDQ R12,CX
MOVQ CX,R12
SHRQ $51,R12
ANDQ AX,CX
ADDQ R12,R8
MOVQ R8,R12
SHRQ $51,R12
ANDQ AX,R8
ADDQ R12,R9
MOVQ R9,R12
SHRQ $51,R12
ANDQ AX,R9
IMUL3Q $19,R12,R12
ADDQ R12,SI
SUBQ $1,R11
JA REDUCELOOP
MOVQ $1,R12
CMPQ R10,SI
CMOVQLT R11,R12
CMPQ AX,DX
CMOVQNE R11,R12
CMPQ AX,CX
CMOVQNE R11,R12
CMPQ AX,R8
CMOVQNE R11,R12
CMPQ AX,R9
CMOVQNE R11,R12
NEGQ R12
ANDQ R12,AX
ANDQ R12,R10
SUBQ R10,SI
SUBQ AX,DX
SUBQ AX,CX
SUBQ AX,R8
SUBQ AX,R9
MOVQ SI,0(DI)
MOVQ DX,8(DI)
MOVQ CX,16(DI)
MOVQ R8,24(DI)
MOVQ R9,32(DI)
MOVQ 0(SP),R11
MOVQ 8(SP),R12
MOVQ 16(SP),R13
MOVQ 24(SP),R14
MOVQ 32(SP),R15
MOVQ 40(SP),BX
MOVQ 48(SP),BP
MOVQ R11,SP
MOVQ DI,AX
MOVQ SI,DX
RET

1398
vendor/github.com/keybase/go-crypto/curve25519/ladderstep_amd64.s generated vendored Normal file
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vendor/github.com/keybase/go-crypto/curve25519/mont25519_amd64.go generated vendored Normal file
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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build amd64,!gccgo,!appengine
package curve25519
// These functions are implemented in the .s files. The names of the functions
// in the rest of the file are also taken from the SUPERCOP sources to help
// people following along.
//go:noescape
func cswap(inout *[5]uint64, v uint64)
//go:noescape
func ladderstep(inout *[5][5]uint64)
//go:noescape
func freeze(inout *[5]uint64)
//go:noescape
func mul(dest, a, b *[5]uint64)
//go:noescape
func square(out, in *[5]uint64)
// mladder uses a Montgomery ladder to calculate (xr/zr) *= s.
func mladder(xr, zr *[5]uint64, s *[32]byte) {
var work [5][5]uint64
work[0] = *xr
setint(&work[1], 1)
setint(&work[2], 0)
work[3] = *xr
setint(&work[4], 1)
j := uint(6)
var prevbit byte
for i := 31; i >= 0; i-- {
for j < 8 {
bit := ((*s)[i] >> j) & 1
swap := bit ^ prevbit
prevbit = bit
cswap(&work[1], uint64(swap))
ladderstep(&work)
j--
}
j = 7
}
*xr = work[1]
*zr = work[2]
}
func scalarMult(out, in, base *[32]byte) {
var e [32]byte
copy(e[:], (*in)[:])
e[0] &= 248
e[31] &= 127
e[31] |= 64
var t, z [5]uint64
unpack(&t, base)
mladder(&t, &z, &e)
invert(&z, &z)
mul(&t, &t, &z)
pack(out, &t)
}
func setint(r *[5]uint64, v uint64) {
r[0] = v
r[1] = 0
r[2] = 0
r[3] = 0
r[4] = 0
}
// unpack sets r = x where r consists of 5, 51-bit limbs in little-endian
// order.
func unpack(r *[5]uint64, x *[32]byte) {
r[0] = uint64(x[0]) |
uint64(x[1])<<8 |
uint64(x[2])<<16 |
uint64(x[3])<<24 |
uint64(x[4])<<32 |
uint64(x[5])<<40 |
uint64(x[6]&7)<<48
r[1] = uint64(x[6])>>3 |
uint64(x[7])<<5 |
uint64(x[8])<<13 |
uint64(x[9])<<21 |
uint64(x[10])<<29 |
uint64(x[11])<<37 |
uint64(x[12]&63)<<45
r[2] = uint64(x[12])>>6 |
uint64(x[13])<<2 |
uint64(x[14])<<10 |
uint64(x[15])<<18 |
uint64(x[16])<<26 |
uint64(x[17])<<34 |
uint64(x[18])<<42 |
uint64(x[19]&1)<<50
r[3] = uint64(x[19])>>1 |
uint64(x[20])<<7 |
uint64(x[21])<<15 |
uint64(x[22])<<23 |
uint64(x[23])<<31 |
uint64(x[24])<<39 |
uint64(x[25]&15)<<47
r[4] = uint64(x[25])>>4 |
uint64(x[26])<<4 |
uint64(x[27])<<12 |
uint64(x[28])<<20 |
uint64(x[29])<<28 |
uint64(x[30])<<36 |
uint64(x[31]&127)<<44
}
// pack sets out = x where out is the usual, little-endian form of the 5,
// 51-bit limbs in x.
func pack(out *[32]byte, x *[5]uint64) {
t := *x
freeze(&t)
out[0] = byte(t[0])
out[1] = byte(t[0] >> 8)
out[2] = byte(t[0] >> 16)
out[3] = byte(t[0] >> 24)
out[4] = byte(t[0] >> 32)
out[5] = byte(t[0] >> 40)
out[6] = byte(t[0] >> 48)
out[6] ^= byte(t[1]<<3) & 0xf8
out[7] = byte(t[1] >> 5)
out[8] = byte(t[1] >> 13)
out[9] = byte(t[1] >> 21)
out[10] = byte(t[1] >> 29)
out[11] = byte(t[1] >> 37)
out[12] = byte(t[1] >> 45)
out[12] ^= byte(t[2]<<6) & 0xc0
out[13] = byte(t[2] >> 2)
out[14] = byte(t[2] >> 10)
out[15] = byte(t[2] >> 18)
out[16] = byte(t[2] >> 26)
out[17] = byte(t[2] >> 34)
out[18] = byte(t[2] >> 42)
out[19] = byte(t[2] >> 50)
out[19] ^= byte(t[3]<<1) & 0xfe
out[20] = byte(t[3] >> 7)
out[21] = byte(t[3] >> 15)
out[22] = byte(t[3] >> 23)
out[23] = byte(t[3] >> 31)
out[24] = byte(t[3] >> 39)
out[25] = byte(t[3] >> 47)
out[25] ^= byte(t[4]<<4) & 0xf0
out[26] = byte(t[4] >> 4)
out[27] = byte(t[4] >> 12)
out[28] = byte(t[4] >> 20)
out[29] = byte(t[4] >> 28)
out[30] = byte(t[4] >> 36)
out[31] = byte(t[4] >> 44)
}
// invert calculates r = x^-1 mod p using Fermat's little theorem.
func invert(r *[5]uint64, x *[5]uint64) {
var z2, z9, z11, z2_5_0, z2_10_0, z2_20_0, z2_50_0, z2_100_0, t [5]uint64
square(&z2, x) /* 2 */
square(&t, &z2) /* 4 */
square(&t, &t) /* 8 */
mul(&z9, &t, x) /* 9 */
mul(&z11, &z9, &z2) /* 11 */
square(&t, &z11) /* 22 */
mul(&z2_5_0, &t, &z9) /* 2^5 - 2^0 = 31 */
square(&t, &z2_5_0) /* 2^6 - 2^1 */
for i := 1; i < 5; i++ { /* 2^20 - 2^10 */
square(&t, &t)
}
mul(&z2_10_0, &t, &z2_5_0) /* 2^10 - 2^0 */
square(&t, &z2_10_0) /* 2^11 - 2^1 */
for i := 1; i < 10; i++ { /* 2^20 - 2^10 */
square(&t, &t)
}
mul(&z2_20_0, &t, &z2_10_0) /* 2^20 - 2^0 */
square(&t, &z2_20_0) /* 2^21 - 2^1 */
for i := 1; i < 20; i++ { /* 2^40 - 2^20 */
square(&t, &t)
}
mul(&t, &t, &z2_20_0) /* 2^40 - 2^0 */
square(&t, &t) /* 2^41 - 2^1 */
for i := 1; i < 10; i++ { /* 2^50 - 2^10 */
square(&t, &t)
}
mul(&z2_50_0, &t, &z2_10_0) /* 2^50 - 2^0 */
square(&t, &z2_50_0) /* 2^51 - 2^1 */
for i := 1; i < 50; i++ { /* 2^100 - 2^50 */
square(&t, &t)
}
mul(&z2_100_0, &t, &z2_50_0) /* 2^100 - 2^0 */
square(&t, &z2_100_0) /* 2^101 - 2^1 */
for i := 1; i < 100; i++ { /* 2^200 - 2^100 */
square(&t, &t)
}
mul(&t, &t, &z2_100_0) /* 2^200 - 2^0 */
square(&t, &t) /* 2^201 - 2^1 */
for i := 1; i < 50; i++ { /* 2^250 - 2^50 */
square(&t, &t)
}
mul(&t, &t, &z2_50_0) /* 2^250 - 2^0 */
square(&t, &t) /* 2^251 - 2^1 */
square(&t, &t) /* 2^252 - 2^2 */
square(&t, &t) /* 2^253 - 2^3 */
square(&t, &t) /* 2^254 - 2^4 */
square(&t, &t) /* 2^255 - 2^5 */
mul(r, &t, &z11) /* 2^255 - 21 */
}

191
vendor/github.com/keybase/go-crypto/curve25519/mul_amd64.s generated vendored Normal file
View file

@ -0,0 +1,191 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
// +build amd64,!gccgo,!appengine
// func mul(dest, a, b *[5]uint64)
TEXT ·mul(SB),0,$128-24
MOVQ dest+0(FP), DI
MOVQ a+8(FP), SI
MOVQ b+16(FP), DX
MOVQ SP,R11
MOVQ $31,CX
NOTQ CX
ANDQ CX,SP
ADDQ $32,SP
MOVQ R11,0(SP)
MOVQ R12,8(SP)
MOVQ R13,16(SP)
MOVQ R14,24(SP)
MOVQ R15,32(SP)
MOVQ BX,40(SP)
MOVQ BP,48(SP)
MOVQ DI,56(SP)
MOVQ DX,CX
MOVQ 24(SI),DX
IMUL3Q $19,DX,AX
MOVQ AX,64(SP)
MULQ 16(CX)
MOVQ AX,R8
MOVQ DX,R9
MOVQ 32(SI),DX
IMUL3Q $19,DX,AX
MOVQ AX,72(SP)
MULQ 8(CX)
ADDQ AX,R8
ADCQ DX,R9
MOVQ 0(SI),AX
MULQ 0(CX)
ADDQ AX,R8
ADCQ DX,R9
MOVQ 0(SI),AX
MULQ 8(CX)
MOVQ AX,R10
MOVQ DX,R11
MOVQ 0(SI),AX
MULQ 16(CX)
MOVQ AX,R12
MOVQ DX,R13
MOVQ 0(SI),AX
MULQ 24(CX)
MOVQ AX,R14
MOVQ DX,R15
MOVQ 0(SI),AX
MULQ 32(CX)
MOVQ AX,BX
MOVQ DX,BP
MOVQ 8(SI),AX
MULQ 0(CX)
ADDQ AX,R10
ADCQ DX,R11
MOVQ 8(SI),AX
MULQ 8(CX)
ADDQ AX,R12
ADCQ DX,R13
MOVQ 8(SI),AX
MULQ 16(CX)
ADDQ AX,R14
ADCQ DX,R15
MOVQ 8(SI),AX
MULQ 24(CX)
ADDQ AX,BX
ADCQ DX,BP
MOVQ 8(SI),DX
IMUL3Q $19,DX,AX
MULQ 32(CX)
ADDQ AX,R8
ADCQ DX,R9
MOVQ 16(SI),AX
MULQ 0(CX)
ADDQ AX,R12
ADCQ DX,R13
MOVQ 16(SI),AX
MULQ 8(CX)
ADDQ AX,R14
ADCQ DX,R15
MOVQ 16(SI),AX
MULQ 16(CX)
ADDQ AX,BX
ADCQ DX,BP
MOVQ 16(SI),DX
IMUL3Q $19,DX,AX
MULQ 24(CX)
ADDQ AX,R8
ADCQ DX,R9
MOVQ 16(SI),DX
IMUL3Q $19,DX,AX
MULQ 32(CX)
ADDQ AX,R10
ADCQ DX,R11
MOVQ 24(SI),AX
MULQ 0(CX)
ADDQ AX,R14
ADCQ DX,R15
MOVQ 24(SI),AX
MULQ 8(CX)
ADDQ AX,BX
ADCQ DX,BP
MOVQ 64(SP),AX
MULQ 24(CX)
ADDQ AX,R10
ADCQ DX,R11
MOVQ 64(SP),AX
MULQ 32(CX)
ADDQ AX,R12
ADCQ DX,R13
MOVQ 32(SI),AX
MULQ 0(CX)
ADDQ AX,BX
ADCQ DX,BP
MOVQ 72(SP),AX
MULQ 16(CX)
ADDQ AX,R10
ADCQ DX,R11
MOVQ 72(SP),AX
MULQ 24(CX)
ADDQ AX,R12
ADCQ DX,R13
MOVQ 72(SP),AX
MULQ 32(CX)
ADDQ AX,R14
ADCQ DX,R15
MOVQ ·REDMASK51(SB),SI
SHLQ $13,R9:R8
ANDQ SI,R8
SHLQ $13,R11:R10
ANDQ SI,R10
ADDQ R9,R10
SHLQ $13,R13:R12
ANDQ SI,R12
ADDQ R11,R12
SHLQ $13,R15:R14
ANDQ SI,R14
ADDQ R13,R14
SHLQ $13,BP:BX
ANDQ SI,BX
ADDQ R15,BX
IMUL3Q $19,BP,DX
ADDQ DX,R8
MOVQ R8,DX
SHRQ $51,DX
ADDQ R10,DX
MOVQ DX,CX
SHRQ $51,DX
ANDQ SI,R8
ADDQ R12,DX
MOVQ DX,R9
SHRQ $51,DX
ANDQ SI,CX
ADDQ R14,DX
MOVQ DX,AX
SHRQ $51,DX
ANDQ SI,R9
ADDQ BX,DX
MOVQ DX,R10
SHRQ $51,DX
ANDQ SI,AX
IMUL3Q $19,DX,DX
ADDQ DX,R8
ANDQ SI,R10
MOVQ R8,0(DI)
MOVQ CX,8(DI)
MOVQ R9,16(DI)
MOVQ AX,24(DI)
MOVQ R10,32(DI)
MOVQ 0(SP),R11
MOVQ 8(SP),R12
MOVQ 16(SP),R13
MOVQ 24(SP),R14
MOVQ 32(SP),R15
MOVQ 40(SP),BX
MOVQ 48(SP),BP
MOVQ R11,SP
MOVQ DI,AX
MOVQ SI,DX
RET

153
vendor/github.com/keybase/go-crypto/curve25519/square_amd64.s generated vendored Normal file
View file

@ -0,0 +1,153 @@
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// This code was translated into a form compatible with 6a from the public
// domain sources in SUPERCOP: http://bench.cr.yp.to/supercop.html
// +build amd64,!gccgo,!appengine
// func square(out, in *[5]uint64)
TEXT ·square(SB),7,$96-16
MOVQ out+0(FP), DI
MOVQ in+8(FP), SI
MOVQ SP,R11
MOVQ $31,CX
NOTQ CX
ANDQ CX,SP
ADDQ $32, SP
MOVQ R11,0(SP)
MOVQ R12,8(SP)
MOVQ R13,16(SP)
MOVQ R14,24(SP)
MOVQ R15,32(SP)
MOVQ BX,40(SP)
MOVQ BP,48(SP)
MOVQ 0(SI),AX
MULQ 0(SI)
MOVQ AX,CX
MOVQ DX,R8
MOVQ 0(SI),AX
SHLQ $1,AX
MULQ 8(SI)
MOVQ AX,R9
MOVQ DX,R10
MOVQ 0(SI),AX
SHLQ $1,AX
MULQ 16(SI)
MOVQ AX,R11
MOVQ DX,R12
MOVQ 0(SI),AX
SHLQ $1,AX
MULQ 24(SI)
MOVQ AX,R13
MOVQ DX,R14
MOVQ 0(SI),AX
SHLQ $1,AX
MULQ 32(SI)
MOVQ AX,R15
MOVQ DX,BX
MOVQ 8(SI),AX
MULQ 8(SI)
ADDQ AX,R11
ADCQ DX,R12
MOVQ 8(SI),AX
SHLQ $1,AX
MULQ 16(SI)
ADDQ AX,R13
ADCQ DX,R14
MOVQ 8(SI),AX
SHLQ $1,AX
MULQ 24(SI)
ADDQ AX,R15
ADCQ DX,BX
MOVQ 8(SI),DX
IMUL3Q $38,DX,AX
MULQ 32(SI)
ADDQ AX,CX
ADCQ DX,R8
MOVQ 16(SI),AX
MULQ 16(SI)
ADDQ AX,R15
ADCQ DX,BX
MOVQ 16(SI),DX
IMUL3Q $38,DX,AX
MULQ 24(SI)
ADDQ AX,CX
ADCQ DX,R8
MOVQ 16(SI),DX
IMUL3Q $38,DX,AX
MULQ 32(SI)
ADDQ AX,R9
ADCQ DX,R10
MOVQ 24(SI),DX
IMUL3Q $19,DX,AX
MULQ 24(SI)
ADDQ AX,R9
ADCQ DX,R10
MOVQ 24(SI),DX
IMUL3Q $38,DX,AX
MULQ 32(SI)
ADDQ AX,R11
ADCQ DX,R12
MOVQ 32(SI),DX
IMUL3Q $19,DX,AX
MULQ 32(SI)
ADDQ AX,R13
ADCQ DX,R14
MOVQ ·REDMASK51(SB),SI
SHLQ $13,R8:CX
ANDQ SI,CX
SHLQ $13,R10:R9
ANDQ SI,R9
ADDQ R8,R9
SHLQ $13,R12:R11
ANDQ SI,R11
ADDQ R10,R11
SHLQ $13,R14:R13
ANDQ SI,R13
ADDQ R12,R13
SHLQ $13,BX:R15
ANDQ SI,R15
ADDQ R14,R15
IMUL3Q $19,BX,DX
ADDQ DX,CX
MOVQ CX,DX
SHRQ $51,DX
ADDQ R9,DX
ANDQ SI,CX
MOVQ DX,R8
SHRQ $51,DX
ADDQ R11,DX
ANDQ SI,R8
MOVQ DX,R9
SHRQ $51,DX
ADDQ R13,DX
ANDQ SI,R9
MOVQ DX,AX
SHRQ $51,DX
ADDQ R15,DX
ANDQ SI,AX
MOVQ DX,R10
SHRQ $51,DX
IMUL3Q $19,DX,DX
ADDQ DX,CX
ANDQ SI,R10
MOVQ CX,0(DI)
MOVQ R8,8(DI)
MOVQ R9,16(DI)
MOVQ AX,24(DI)
MOVQ R10,32(DI)
MOVQ 0(SP),R11
MOVQ 8(SP),R12
MOVQ 16(SP),R13
MOVQ 24(SP),R14
MOVQ 32(SP),R15
MOVQ 40(SP),BX
MOVQ 48(SP),BP
MOVQ R11,SP
MOVQ DI,AX
MOVQ SI,DX
RET

181
vendor/github.com/keybase/go-crypto/ed25519/ed25519.go generated vendored Normal file
View file

@ -0,0 +1,181 @@
// Copyright 2016 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package ed25519 implements the Ed25519 signature algorithm. See
// http://ed25519.cr.yp.to/.
//
// These functions are also compatible with the “Ed25519” function defined in
// https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05.
package ed25519
// This code is a port of the public domain, “ref10” implementation of ed25519
// from SUPERCOP.
import (
"crypto"
cryptorand "crypto/rand"
"crypto/sha512"
"crypto/subtle"
"errors"
"io"
"strconv"
"github.com/keybase/go-crypto/ed25519/internal/edwards25519"
)
const (
// PublicKeySize is the size, in bytes, of public keys as used in this package.
PublicKeySize = 32
// PrivateKeySize is the size, in bytes, of private keys as used in this package.
PrivateKeySize = 64
// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
SignatureSize = 64
)
// PublicKey is the type of Ed25519 public keys.
type PublicKey []byte
// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
type PrivateKey []byte
// Public returns the PublicKey corresponding to priv.
func (priv PrivateKey) Public() crypto.PublicKey {
publicKey := make([]byte, PublicKeySize)
copy(publicKey, priv[32:])
return PublicKey(publicKey)
}
// Sign signs the given message with priv.
// Ed25519 performs two passes over messages to be signed and therefore cannot
// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
// indicate the message hasn't been hashed. This can be achieved by passing
// crypto.Hash(0) as the value for opts.
func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
if opts.HashFunc() != crypto.Hash(0) {
return nil, errors.New("ed25519: cannot sign hashed message")
}
return Sign(priv, message), nil
}
// GenerateKey generates a public/private key pair using entropy from rand.
// If rand is nil, crypto/rand.Reader will be used.
func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) {
if rand == nil {
rand = cryptorand.Reader
}
privateKey = make([]byte, PrivateKeySize)
publicKey = make([]byte, PublicKeySize)
_, err = io.ReadFull(rand, privateKey[:32])
if err != nil {
return nil, nil, err
}
digest := sha512.Sum512(privateKey[:32])
digest[0] &= 248
digest[31] &= 127
digest[31] |= 64
var A edwards25519.ExtendedGroupElement
var hBytes [32]byte
copy(hBytes[:], digest[:])
edwards25519.GeScalarMultBase(&A, &hBytes)
var publicKeyBytes [32]byte
A.ToBytes(&publicKeyBytes)
copy(privateKey[32:], publicKeyBytes[:])
copy(publicKey, publicKeyBytes[:])
return publicKey, privateKey, nil
}
// Sign signs the message with privateKey and returns a signature. It will
// panic if len(privateKey) is not PrivateKeySize.
func Sign(privateKey PrivateKey, message []byte) []byte {
if l := len(privateKey); l != PrivateKeySize {
panic("ed25519: bad private key length: " + strconv.Itoa(l))
}
h := sha512.New()
h.Write(privateKey[:32])
var digest1, messageDigest, hramDigest [64]byte
var expandedSecretKey [32]byte
h.Sum(digest1[:0])
copy(expandedSecretKey[:], digest1[:])
expandedSecretKey[0] &= 248
expandedSecretKey[31] &= 63
expandedSecretKey[31] |= 64
h.Reset()
h.Write(digest1[32:])
h.Write(message)
h.Sum(messageDigest[:0])
var messageDigestReduced [32]byte
edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
var R edwards25519.ExtendedGroupElement
edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
var encodedR [32]byte
R.ToBytes(&encodedR)
h.Reset()
h.Write(encodedR[:])
h.Write(privateKey[32:])
h.Write(message)
h.Sum(hramDigest[:0])
var hramDigestReduced [32]byte
edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
var s [32]byte
edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
signature := make([]byte, SignatureSize)
copy(signature[:], encodedR[:])
copy(signature[32:], s[:])
return signature
}
// Verify reports whether sig is a valid signature of message by publicKey. It
// will panic if len(publicKey) is not PublicKeySize.
func Verify(publicKey PublicKey, message, sig []byte) bool {
if l := len(publicKey); l != PublicKeySize {
panic("ed25519: bad public key length: " + strconv.Itoa(l))
}
if len(sig) != SignatureSize || sig[63]&224 != 0 {
return false
}
var A edwards25519.ExtendedGroupElement
var publicKeyBytes [32]byte
copy(publicKeyBytes[:], publicKey)
if !A.FromBytes(&publicKeyBytes) {
return false
}
edwards25519.FeNeg(&A.X, &A.X)
edwards25519.FeNeg(&A.T, &A.T)
h := sha512.New()
h.Write(sig[:32])
h.Write(publicKey[:])
h.Write(message)
var digest [64]byte
h.Sum(digest[:0])
var hReduced [32]byte
edwards25519.ScReduce(&hReduced, &digest)
var R edwards25519.ProjectiveGroupElement
var b [32]byte
copy(b[:], sig[32:])
edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b)
var checkR [32]byte
R.ToBytes(&checkR)
return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1
}

1422
vendor/github.com/keybase/go-crypto/ed25519/internal/edwards25519/const.go generated vendored Normal file
View file

File diff suppressed because it is too large Load diff

1771
vendor/github.com/keybase/go-crypto/ed25519/internal/edwards25519/edwards25519.go generated vendored Normal file
View file

File diff suppressed because it is too large Load diff

48
vendor/golang.org/x/crypto/openpgp/armor/armor.go → vendor/github.com/keybase/go-crypto/openpgp/armor/armor.go generated vendored
View file

@ -4,14 +4,17 @@
// Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
// very similar to PEM except that it has an additional CRC checksum.
package armor // import "golang.org/x/crypto/openpgp/armor"
package armor // import "github.com/keybase/go-crypto/openpgp/armor"
import (
"bufio"
"bytes"
"encoding/base64"
"golang.org/x/crypto/openpgp/errors"
"io"
"strings"
"unicode"
"github.com/keybase/go-crypto/openpgp/errors"
)
// A Block represents an OpenPGP armored structure.
@ -65,7 +68,14 @@ type lineReader struct {
in *bufio.Reader
buf []byte
eof bool
crc uint32
crc *uint32
}
// ourIsSpace checks if a rune is either space according to unicode
// package, or ZeroWidthSpace (which is not a space according to
// unicode module). Used to trim lines during header reading.
func ourIsSpace(r rune) bool {
return r == '\u200b' || unicode.IsSpace(r)
}
func (l *lineReader) Read(p []byte) (n int, err error) {
@ -79,13 +89,12 @@ func (l *lineReader) Read(p []byte) (n int, err error) {
return
}
line, isPrefix, err := l.in.ReadLine()
line, _, err := l.in.ReadLine()
if err != nil {
return
}
if isPrefix {
return 0, ArmorCorrupt
}
line = bytes.TrimFunc(line, ourIsSpace)
if len(line) == 5 && line[0] == '=' {
// This is the checksum line
@ -95,13 +104,19 @@ func (l *lineReader) Read(p []byte) (n int, err error) {
if m != 3 || err != nil {
return
}
l.crc = uint32(expectedBytes[0])<<16 |
crc := uint32(expectedBytes[0])<<16 |
uint32(expectedBytes[1])<<8 |
uint32(expectedBytes[2])
l.crc = &crc
line, _, err = l.in.ReadLine()
if err != nil && err != io.EOF {
return
for {
line, _, err = l.in.ReadLine()
if err != nil && err != io.EOF {
return
}
if len(strings.TrimSpace(string(line))) > 0 {
break
}
}
if !bytes.HasPrefix(line, armorEnd) {
return 0, ArmorCorrupt
@ -111,8 +126,11 @@ func (l *lineReader) Read(p []byte) (n int, err error) {
return 0, io.EOF
}
if len(line) > 96 {
return 0, ArmorCorrupt
if bytes.HasPrefix(line, armorEnd) {
// Unexpected ending, there was no checksum.
l.eof = true
l.crc = nil
return 0, io.EOF
}
n = copy(p, line)
@ -142,7 +160,7 @@ func (r *openpgpReader) Read(p []byte) (n int, err error) {
r.currentCRC = crc24(r.currentCRC, p[:n])
if err == io.EOF {
if r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
if r.lReader.crc != nil && *r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
return 0, ArmorCorrupt
}
}
@ -196,7 +214,7 @@ TryNextBlock:
p.Header[lastKey] += string(line)
continue
}
line = bytes.TrimSpace(line)
line = bytes.TrimFunc(line, ourIsSpace)
if len(line) == 0 {
break
}

2
vendor/golang.org/x/crypto/openpgp/armor/encode.go → vendor/github.com/keybase/go-crypto/openpgp/armor/encode.go generated vendored
View file

@ -125,7 +125,7 @@ func (e *encoding) Close() (err error) {
var b64ChecksumBytes [4]byte
base64.StdEncoding.Encode(b64ChecksumBytes[:], checksumBytes[:])
return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine)
return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine, []byte{'\n'})
}
// Encode returns a WriteCloser which will encode the data written to it in

0
vendor/golang.org/x/crypto/openpgp/canonical_text.go → vendor/github.com/keybase/go-crypto/openpgp/canonical_text.go generated vendored
View file

282
vendor/github.com/keybase/go-crypto/openpgp/ecdh/ecdh.go generated vendored Normal file
View file

@ -0,0 +1,282 @@
package ecdh
import (
"bytes"
"crypto"
"crypto/aes"
"crypto/elliptic"
"encoding/binary"
"errors"
"github.com/keybase/go-crypto/curve25519"
"io"
"math/big"
)
type PublicKey struct {
elliptic.Curve
X, Y *big.Int
}
type PrivateKey struct {
PublicKey
X *big.Int
}
// KDF implements Key Derivation Function as described in
// https://tools.ietf.org/html/rfc6637#section-7
func (e *PublicKey) KDF(S []byte, kdfParams []byte, hash crypto.Hash) []byte {
sLen := (e.Curve.Params().P.BitLen() + 7) / 8
buf := new(bytes.Buffer)
buf.Write([]byte{0, 0, 0, 1})
if sLen > len(S) {
// zero-pad the S. If we got invalid S (bigger than curve's
// P), we are going to produce invalid key. Garbage in,
// garbage out.
buf.Write(make([]byte, sLen-len(S)))
}
buf.Write(S)
buf.Write(kdfParams)
hashw := hash.New()
hashw.Write(buf.Bytes())
key := hashw.Sum(nil)
return key
}
// AESKeyUnwrap implements RFC 3394 Key Unwrapping. See
// http://tools.ietf.org/html/rfc3394#section-2.2.1
// Note: The second described algorithm ("index-based") is implemented
// here.
func AESKeyUnwrap(key, cipherText []byte) ([]byte, error) {
if len(cipherText)%8 != 0 {
return nil, errors.New("cipherText must by a multiple of 64 bits")
}
cipher, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
nblocks := len(cipherText)/8 - 1
// 1) Initialize variables.
// - Set A = C[0]
var A [aes.BlockSize]byte
copy(A[:8], cipherText[:8])
// For i = 1 to n
// Set R[i] = C[i]
R := make([]byte, len(cipherText)-8)
copy(R, cipherText[8:])
// 2) Compute intermediate values.
for j := 5; j >= 0; j-- {
for i := nblocks - 1; i >= 0; i-- {
// B = AES-1(K, (A ^ t) | R[i]) where t = n*j+i
// A = MSB(64, B)
t := uint64(nblocks*j + i + 1)
At := binary.BigEndian.Uint64(A[:8]) ^ t
binary.BigEndian.PutUint64(A[:8], At)
copy(A[8:], R[i*8:i*8+8])
cipher.Decrypt(A[:], A[:])
// R[i] = LSB(B, 64)
copy(R[i*8:i*8+8], A[8:])
}
}
// 3) Output results.
// If A is an appropriate initial value (see 2.2.3),
for i := 0; i < 8; i++ {
if A[i] != 0xA6 {
return nil, errors.New("Failed to unwrap key (A is not IV)")
}
}
return R, nil
}
// AESKeyWrap implements RFC 3394 Key Wrapping. See
// https://tools.ietf.org/html/rfc3394#section-2.2.2
// Note: The second described algorithm ("index-based") is implemented
// here.
func AESKeyWrap(key, plainText []byte) ([]byte, error) {
if len(plainText)%8 != 0 {
return nil, errors.New("plainText must be a multiple of 64 bits")
}
cipher, err := aes.NewCipher(key) // NewCipher checks key size
if err != nil {
return nil, err
}
nblocks := len(plainText) / 8
// 1) Initialize variables.
var A [aes.BlockSize]byte
// Section 2.2.3.1 -- Initial Value
// http://tools.ietf.org/html/rfc3394#section-2.2.3.1
for i := 0; i < 8; i++ {
A[i] = 0xA6
}
// For i = 1 to n
// Set R[i] = P[i]
R := make([]byte, len(plainText))
copy(R, plainText)
// 2) Calculate intermediate values.
for j := 0; j <= 5; j++ {
for i := 0; i < nblocks; i++ {
// B = AES(K, A | R[i])
copy(A[8:], R[i*8:i*8+8])
cipher.Encrypt(A[:], A[:])
// (Assume B = A)
// A = MSB(64, B) ^ t where t = (n*j)+1
t := uint64(j*nblocks + i + 1)
At := binary.BigEndian.Uint64(A[:8]) ^ t
binary.BigEndian.PutUint64(A[:8], At)
// R[i] = LSB(64, B)
copy(R[i*8:i*8+8], A[8:])
}
}
// 3) Output results.
// Set C[0] = A
// For i = 1 to n
// C[i] = R[i]
return append(A[:8], R...), nil
}
// PadBuffer pads byte buffer buf to a length being multiple of
// blockLen. Additional bytes appended to the buffer have value of the
// number padded bytes. E.g. if the buffer is 3 bytes short of being
// 40 bytes total, the appended bytes will be [03, 03, 03].
func PadBuffer(buf []byte, blockLen int) []byte {
padding := blockLen - (len(buf) % blockLen)
if padding == 0 {
return buf
}
padBuf := make([]byte, padding)
for i := 0; i < padding; i++ {
padBuf[i] = byte(padding)
}
return append(buf, padBuf...)
}
// UnpadBuffer verifies that buffer contains proper padding and
// returns buffer without the padding, or nil if the padding was
// invalid.
func UnpadBuffer(buf []byte, dataLen int) []byte {
padding := len(buf) - dataLen
outBuf := buf[:dataLen]
for i := dataLen; i < len(buf); i++ {
if buf[i] != byte(padding) {
// Invalid padding - bail out
return nil
}
}
return outBuf
}
func (e *PublicKey) Encrypt(random io.Reader, kdfParams []byte, plain []byte, hash crypto.Hash, kdfKeySize int) (Vx *big.Int, Vy *big.Int, C []byte, err error) {
// Vx, Vy - encryption key
// Note for Curve 25519 - curve25519 library already does key
// clamping in scalarMult, so we can use generic random scalar
// generation from elliptic.
priv, Vx, Vy, err := elliptic.GenerateKey(e.Curve, random)
if err != nil {
return nil, nil, nil, err
}
// Sx, Sy - shared secret
Sx, _ := e.Curve.ScalarMult(e.X, e.Y, priv)
// Encrypt the payload with KDF-ed S as the encryption key. Pass
// the ciphertext along with V to the recipient. Recipient can
// generate S using V and their priv key, and then KDF(S), on
// their own, to get encryption key and decrypt the ciphertext,
// revealing encryption key for symmetric encryption later.
plain = PadBuffer(plain, 8)
key := e.KDF(Sx.Bytes(), kdfParams, hash)
// Take only as many bytes from key as the key length (the hash
// result might be bigger)
encrypted, err := AESKeyWrap(key[:kdfKeySize], plain)
return Vx, Vy, encrypted, nil
}
func (e *PrivateKey) DecryptShared(X, Y *big.Int) []byte {
Sx, _ := e.Curve.ScalarMult(X, Y, e.X.Bytes())
return Sx.Bytes()
}
func countBits(buffer []byte) int {
var headerLen int
switch buffer[0] {
case 0x4:
headerLen = 3
case 0x40:
headerLen = 7
default:
// Unexpected header - but we can still count the bits.
val := buffer[0]
headerLen = 0
for val > 0 {
val = val / 2
headerLen++
}
}
return headerLen + (len(buffer)-1)*8
}
// elliptic.Marshal and elliptic.Unmarshal only marshals uncompressed
// 0x4 MPI types. These functions will check if the curve is cv25519,
// and if so, use 0x40 compressed type to (un)marshal. Otherwise,
// elliptic.(Un)marshal will be called.
// Marshal encodes point into either 0x4 uncompressed point form, or
// 0x40 compressed point for Curve 25519.
func Marshal(curve elliptic.Curve, x, y *big.Int) (buf []byte, bitSize int) {
// NOTE: Read more about MPI encoding in the RFC:
// https://tools.ietf.org/html/rfc4880#section-3.2
// We are required to encode size in bits, counting from the most-
// significant non-zero bit. So assuming that the buffer never
// starts with 0x00, we only need to count bits in the first byte
// - and in current implentation it will always be 0x4 or 0x40.
cv, ok := curve25519.ToCurve25519(curve)
if ok {
buf = cv.MarshalType40(x, y)
} else {
buf = elliptic.Marshal(curve, x, y)
}
return buf, countBits(buf)
}
// Unmarshal converts point, serialized by Marshal, into x, y pair.
// For 0x40 compressed points (for Curve 25519), y will always be 0.
// It is an error if point is not on the curve, On error, x = nil.
func Unmarshal(curve elliptic.Curve, data []byte) (x, y *big.Int) {
cv, ok := curve25519.ToCurve25519(curve)
if ok {
return cv.UnmarshalType40(data)
}
return elliptic.Unmarshal(curve, data)
}

2
vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go → vendor/github.com/keybase/go-crypto/openpgp/elgamal/elgamal.go generated vendored
View file

@ -10,7 +10,7 @@
// This form of ElGamal embeds PKCS#1 v1.5 padding, which may make it
// unsuitable for other protocols. RSA should be used in preference in any
// case.
package elgamal // import "golang.org/x/crypto/openpgp/elgamal"
package elgamal // import "github.com/keybase/go-crypto/openpgp/elgamal"
import (
"crypto/rand"

2
vendor/golang.org/x/crypto/openpgp/errors/errors.go → vendor/github.com/keybase/go-crypto/openpgp/errors/errors.go generated vendored
View file

@ -3,7 +3,7 @@
// license that can be found in the LICENSE file.
// Package errors contains common error types for the OpenPGP packages.
package errors // import "golang.org/x/crypto/openpgp/errors"
package errors // import "github.com/keybase/go-crypto/openpgp/errors"
import (
"strconv"

902
vendor/github.com/keybase/go-crypto/openpgp/keys.go generated vendored Normal file
View file

@ -0,0 +1,902 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
"crypto/hmac"
"encoding/binary"
"io"
"time"
"github.com/keybase/go-crypto/openpgp/armor"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/packet"
"github.com/keybase/go-crypto/rsa"
)
// PublicKeyType is the armor type for a PGP public key.
var PublicKeyType = "PGP PUBLIC KEY BLOCK"
// PrivateKeyType is the armor type for a PGP private key.
var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
// An Entity represents the components of an OpenPGP key: a primary public key
// (which must be a signing key), one or more identities claimed by that key,
// and zero or more subkeys, which may be encryption keys.
type Entity struct {
PrimaryKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Identities map[string]*Identity // indexed by Identity.Name
Revocations []*packet.Signature
// Revocations that are signed by designated revokers. Reading keys
// will not verify these revocations, because it won't have access to
// issuers' public keys, API consumers should do this instead (or
// not, and just assume that the key is probably revoked).
UnverifiedRevocations []*packet.Signature
Subkeys []Subkey
BadSubkeys []BadSubkey
}
// An Identity represents an identity claimed by an Entity and zero or more
// assertions by other entities about that claim.
type Identity struct {
Name string // by convention, has the form "Full Name (comment) <email@example.com>"
UserId *packet.UserId
SelfSignature *packet.Signature
Signatures []*packet.Signature
Revocation *packet.Signature
}
// A Subkey is an additional public key in an Entity. Subkeys can be used for
// encryption.
type Subkey struct {
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Sig *packet.Signature
Revocation *packet.Signature
}
// BadSubkey is one that failed reconstruction, but we'll keep it around for
// informational purposes.
type BadSubkey struct {
Subkey
Err error
}
// A Key identifies a specific public key in an Entity. This is either the
// Entity's primary key or a subkey.
type Key struct {
Entity *Entity
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
SelfSignature *packet.Signature
KeyFlags packet.KeyFlagBits
}
// A KeyRing provides access to public and private keys.
type KeyRing interface {
// KeysById returns the set of keys that have the given key id.
// fp can be optionally supplied, which is the full key fingerprint.
// If it's provided, then it must match. This comes up in the case
// of GPG subpacket 33.
KeysById(id uint64, fp []byte) []Key
// KeysByIdAndUsage returns the set of keys with the given id
// that also meet the key usage given by requiredUsage.
// The requiredUsage is expressed as the bitwise-OR of
// packet.KeyFlag* values.
// fp can be optionally supplied, which is the full key fingerprint.
// If it's provided, then it must match. This comes up in the case
// of GPG subpacket 33.
KeysByIdUsage(id uint64, fp []byte, requiredUsage byte) []Key
// DecryptionKeys returns all private keys that are valid for
// decryption.
DecryptionKeys() []Key
}
// primaryIdentity returns the Identity marked as primary or the first identity
// if none are so marked.
func (e *Entity) primaryIdentity() *Identity {
var firstIdentity *Identity
for _, ident := range e.Identities {
if firstIdentity == nil {
firstIdentity = ident
}
if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
return ident
}
}
return firstIdentity
}
// encryptionKey returns the best candidate Key for encrypting a message to the
// given Entity.
func (e *Entity) encryptionKey(now time.Time) (Key, bool) {
candidateSubkey := -1
// Iterate the keys to find the newest key
var maxTime time.Time
for i, subkey := range e.Subkeys {
// NOTE(maxtaco)
// If there is a Flags subpacket, then we have to follow it, and only
// use keys that are marked for Encryption of Communication. If there
// isn't a Flags subpacket, and this is an Encrypt-Only key (right now only ElGamal
// suffices), then we implicitly use it. The check for primary below is a little
// more open-ended, but for now, let's be strict and potentially open up
// if we see bugs in the wild.
//
// One more note: old DSA/ElGamal keys tend not to have the Flags subpacket,
// so this sort of thing is pretty important for encrypting to older keys.
//
if ((subkey.Sig.FlagsValid && subkey.Sig.FlagEncryptCommunications) ||
(!subkey.Sig.FlagsValid && subkey.PublicKey.PubKeyAlgo == packet.PubKeyAlgoElGamal)) &&
subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
!subkey.Sig.KeyExpired(now) &&
subkey.Revocation == nil &&
(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
candidateSubkey = i
maxTime = subkey.Sig.CreationTime
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig, subkey.Sig.GetKeyFlags()}, true
}
// If we don't have any candidate subkeys for encryption and
// the primary key doesn't have any usage metadata then we
// assume that the primary key is ok. Or, if the primary key is
// marked as ok to encrypt to, then we can obviously use it.
//
// NOTE(maxtaco) - see note above, how this policy is a little too open-ended
// for my liking, but leave it for now.
i := e.primaryIdentity()
if (!i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications) &&
e.PrimaryKey.PubKeyAlgo.CanEncrypt() &&
!i.SelfSignature.KeyExpired(now) {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature, i.SelfSignature.GetKeyFlags()}, true
}
// This Entity appears to be signing only.
return Key{}, false
}
// signingKey return the best candidate Key for signing a message with this
// Entity.
func (e *Entity) signingKey(now time.Time) (Key, bool) {
candidateSubkey := -1
for i, subkey := range e.Subkeys {
if (!subkey.Sig.FlagsValid || subkey.Sig.FlagSign) &&
subkey.PrivateKey.PrivateKey != nil &&
subkey.PublicKey.PubKeyAlgo.CanSign() &&
subkey.Revocation == nil &&
!subkey.Sig.KeyExpired(now) {
candidateSubkey = i
break
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig, subkey.Sig.GetKeyFlags()}, true
}
// If we have no candidate subkey then we assume that it's ok to sign
// with the primary key.
i := e.primaryIdentity()
if (!i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign) &&
e.PrimaryKey.PubKeyAlgo.CanSign() &&
!i.SelfSignature.KeyExpired(now) &&
e.PrivateKey.PrivateKey != nil {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature, i.SelfSignature.GetKeyFlags()}, true
}
return Key{}, false
}
// An EntityList contains one or more Entities.
type EntityList []*Entity
func keyMatchesIdAndFingerprint(key *packet.PublicKey, id uint64, fp []byte) bool {
if key.KeyId != id {
return false
}
if fp == nil {
return true
}
return hmac.Equal(fp, key.Fingerprint[:])
}
// KeysById returns the set of keys that have the given key id.
// fp can be optionally supplied, which is the full key fingerprint.
// If it's provided, then it must match. This comes up in the case
// of GPG subpacket 33.
func (el EntityList) KeysById(id uint64, fp []byte) (keys []Key) {
for _, e := range el {
if keyMatchesIdAndFingerprint(e.PrimaryKey, id, fp) {
var selfSig *packet.Signature
for _, ident := range e.Identities {
if selfSig == nil {
selfSig = ident.SelfSignature
} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
selfSig = ident.SelfSignature
break
}
}
var keyFlags packet.KeyFlagBits
for _, ident := range e.Identities {
keyFlags.Merge(ident.SelfSignature.GetKeyFlags())
}
keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig, keyFlags})
}
for _, subKey := range e.Subkeys {
if keyMatchesIdAndFingerprint(subKey.PublicKey, id, fp) {
// If there's both a a revocation and a sig, then take the
// revocation. Otherwise, we can proceed with the sig.
sig := subKey.Revocation
if sig == nil {
sig = subKey.Sig
}
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, sig, sig.GetKeyFlags()})
}
}
}
return
}
// KeysByIdAndUsage returns the set of keys with the given id that also meet
// the key usage given by requiredUsage. The requiredUsage is expressed as
// the bitwise-OR of packet.KeyFlag* values.
// fp can be optionally supplied, which is the full key fingerprint.
// If it's provided, then it must match. This comes up in the case
// of GPG subpacket 33.
func (el EntityList) KeysByIdUsage(id uint64, fp []byte, requiredUsage byte) (keys []Key) {
for _, key := range el.KeysById(id, fp) {
if len(key.Entity.Revocations) > 0 {
continue
}
if key.SelfSignature.RevocationReason != nil {
continue
}
if requiredUsage != 0 {
var usage byte
switch {
case key.KeyFlags.Valid:
usage = key.KeyFlags.BitField
case key.PublicKey.PubKeyAlgo == packet.PubKeyAlgoElGamal:
// We also need to handle the case where, although the sig's
// flags aren't valid, the key can is implicitly usable for
// encryption by virtue of being ElGamal. See also the comment
// in encryptionKey() above.
usage |= packet.KeyFlagEncryptCommunications
usage |= packet.KeyFlagEncryptStorage
case key.PublicKey.PubKeyAlgo == packet.PubKeyAlgoDSA ||
key.PublicKey.PubKeyAlgo == packet.PubKeyAlgoECDSA ||
key.PublicKey.PubKeyAlgo == packet.PubKeyAlgoEdDSA:
usage |= packet.KeyFlagSign
// For a primary RSA key without any key flags, be as permissiable
// as possible.
case key.PublicKey.PubKeyAlgo == packet.PubKeyAlgoRSA &&
keyMatchesIdAndFingerprint(key.Entity.PrimaryKey, id, fp):
usage = (packet.KeyFlagCertify | packet.KeyFlagSign |
packet.KeyFlagEncryptCommunications | packet.KeyFlagEncryptStorage)
}
if usage&requiredUsage != requiredUsage {
continue
}
}
keys = append(keys, key)
}
return
}
// DecryptionKeys returns all private keys that are valid for decryption.
func (el EntityList) DecryptionKeys() (keys []Key) {
for _, e := range el {
for _, subKey := range e.Subkeys {
if subKey.PrivateKey != nil && subKey.PrivateKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig, subKey.Sig.GetKeyFlags()})
}
}
}
return
}
// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
block, err := armor.Decode(r)
if err == io.EOF {
return nil, errors.InvalidArgumentError("no armored data found")
}
if err != nil {
return nil, err
}
if block.Type != PublicKeyType && block.Type != PrivateKeyType {
return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
}
return ReadKeyRing(block.Body)
}
// ReadKeyRing reads one or more public/private keys. Unsupported keys are
// ignored as long as at least a single valid key is found.
func ReadKeyRing(r io.Reader) (el EntityList, err error) {
packets := packet.NewReader(r)
var lastUnsupportedError error
for {
var e *Entity
e, err = ReadEntity(packets)
if err != nil {
// TODO: warn about skipped unsupported/unreadable keys
if _, ok := err.(errors.UnsupportedError); ok {
lastUnsupportedError = err
err = readToNextPublicKey(packets)
} else if _, ok := err.(errors.StructuralError); ok {
// Skip unreadable, badly-formatted keys
lastUnsupportedError = err
err = readToNextPublicKey(packets)
}
if err == io.EOF {
err = nil
break
}
if err != nil {
el = nil
break
}
} else {
el = append(el, e)
}
}
if len(el) == 0 && err == nil {
err = lastUnsupportedError
}
return
}
// readToNextPublicKey reads packets until the start of the entity and leaves
// the first packet of the new entity in the Reader.
func readToNextPublicKey(packets *packet.Reader) (err error) {
var p packet.Packet
for {
p, err = packets.Next()
if err == io.EOF {
return
} else if err != nil {
if _, ok := err.(errors.UnsupportedError); ok {
err = nil
continue
}
return
}
if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
packets.Unread(p)
return
}
}
panic("unreachable")
}
// ReadEntity reads an entity (public key, identities, subkeys etc) from the
// given Reader.
func ReadEntity(packets *packet.Reader) (*Entity, error) {
e := new(Entity)
e.Identities = make(map[string]*Identity)
p, err := packets.Next()
if err != nil {
return nil, err
}
var ok bool
if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
packets.Unread(p)
return nil, errors.StructuralError("first packet was not a public/private key")
} else {
e.PrimaryKey = &e.PrivateKey.PublicKey
}
}
if !e.PrimaryKey.PubKeyAlgo.CanSign() {
return nil, errors.StructuralError("primary key cannot be used for signatures")
}
var current *Identity
var revocations []*packet.Signature
designatedRevokers := make(map[uint64]bool)
EachPacket:
for {
p, err := packets.Next()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
switch pkt := p.(type) {
case *packet.UserId:
// Make a new Identity object, that we might wind up throwing away.
// We'll only add it if we get a valid self-signature over this
// userID.
current = new(Identity)
current.Name = pkt.Id
current.UserId = pkt
case *packet.Signature:
if pkt.SigType == packet.SigTypeKeyRevocation {
// These revocations won't revoke UIDs (see
// SigTypeIdentityRevocation). Handle these first,
// because key might have revocation coming from
// another key (designated revoke).
revocations = append(revocations, pkt)
continue
}
// These are signatures by other people on this key. Let's just ignore them
// from the beginning, since they shouldn't affect our key decoding one way
// or the other.
if pkt.IssuerKeyId != nil && *pkt.IssuerKeyId != e.PrimaryKey.KeyId {
continue
}
// If this is a signature made by the keyholder, and the signature has stubbed out
// critical packets, then *now* we need to bail out.
if e := pkt.StubbedOutCriticalError; e != nil {
return nil, e
}
// Next handle the case of a self-signature. According to RFC8440,
// Section 5.2.3.3, if there are several self-signatures,
// we should take the newer one. If they were both created
// at the same time, but one of them has keyflags specified and the
// other doesn't, keep the one with the keyflags. We have actually
// seen this in the wild (see the 'Yield' test in read_test.go).
// If there is a tie, and both have the same value for FlagsValid,
// then "last writer wins."
//
// HOWEVER! We have seen yet more keys in the wild (see the 'Spiros'
// test in read_test.go), in which the later self-signature is a bunch
// of junk, and doesn't even specify key flags. Does it really make
// sense to overwrite reasonable key flags with the empty set? I'm not
// sure what that would be trying to achieve, and plus GPG seems to be
// ok with this situation, and ignores the later (empty) keyflag set.
// So further tighten our overwrite rules, and only allow the later
// signature to overwrite the earlier signature if so doing won't
// trash the key flags.
if current != nil &&
(current.SelfSignature == nil ||
(!pkt.CreationTime.Before(current.SelfSignature.CreationTime) &&
(pkt.FlagsValid || !current.SelfSignature.FlagsValid))) &&
(pkt.SigType == packet.SigTypePositiveCert || pkt.SigType == packet.SigTypeGenericCert) &&
pkt.IssuerKeyId != nil &&
*pkt.IssuerKeyId == e.PrimaryKey.KeyId {
if err = e.PrimaryKey.VerifyUserIdSignature(current.Name, e.PrimaryKey, pkt); err == nil {
current.SelfSignature = pkt
// NOTE(maxtaco) 2016.01.11
// Only register an identity once we've gotten a valid self-signature.
// It's possible therefore for us to throw away `current` in the case
// no valid self-signatures were found. That's OK as long as there are
// other identies that make sense.
//
// NOTE! We might later see a revocation for this very same UID, and it
// won't be undone. We've preserved this feature from the original
// Google OpenPGP we forked from.
e.Identities[current.Name] = current
} else {
// We really should warn that there was a failure here. Not raise an error
// since this really shouldn't be a fail-stop error.
}
} else if current != nil && pkt.SigType == packet.SigTypeIdentityRevocation {
if err = e.PrimaryKey.VerifyUserIdSignature(current.Name, e.PrimaryKey, pkt); err == nil {
// Note: we are not removing the identity from
// e.Identities. Caller can always filter by Revocation
// field to ignore revoked identities.
current.Revocation = pkt
}
} else if pkt.SigType == packet.SigTypeDirectSignature {
if err = e.PrimaryKey.VerifyRevocationSignature(e.PrimaryKey, pkt); err == nil {
if desig := pkt.DesignatedRevoker; desig != nil {
// If it's a designated revoker signature, take last 8 octects
// of fingerprint as Key ID and save it to designatedRevokers
// map. We consult this map later to see if a foreign
// revocation should be added to UnverifiedRevocations.
keyID := binary.BigEndian.Uint64(desig.Fingerprint[len(desig.Fingerprint)-8:])
designatedRevokers[keyID] = true
}
}
} else if current == nil {
// NOTE(maxtaco)
//
// See https://github.com/keybase/client/issues/2666
//
// There might have been a user attribute picture before this signature,
// in which case this is still a valid PGP key. In the future we might
// not ignore user attributes (like picture). But either way, it doesn't
// make sense to bail out here. Keep looking for other valid signatures.
//
// Used to be:
// return nil, errors.StructuralError("signature packet found before user id packet")
} else {
current.Signatures = append(current.Signatures, pkt)
}
case *packet.PrivateKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, &pkt.PublicKey, pkt)
if err != nil {
return nil, err
}
case *packet.PublicKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, pkt, nil)
if err != nil {
return nil, err
}
default:
// we ignore unknown packets
}
}
if len(e.Identities) == 0 {
return nil, errors.StructuralError("entity without any identities")
}
for _, revocation := range revocations {
if revocation.IssuerKeyId == nil || *revocation.IssuerKeyId == e.PrimaryKey.KeyId {
// Key revokes itself, something that we can verify.
err = e.PrimaryKey.VerifyRevocationSignature(e.PrimaryKey, revocation)
if err == nil {
e.Revocations = append(e.Revocations, revocation)
} else {
return nil, errors.StructuralError("revocation signature signed by alternate key")
}
} else if revocation.IssuerKeyId != nil {
if _, ok := designatedRevokers[*revocation.IssuerKeyId]; ok {
// Revocation is done by certified designated revoker,
// but we can't verify the revocation.
e.UnverifiedRevocations = append(e.UnverifiedRevocations, revocation)
}
}
}
return e, nil
}
func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
var subKey Subkey
subKey.PublicKey = pub
subKey.PrivateKey = priv
var lastErr error
for {
p, err := packets.Next()
if err == io.EOF {
break
}
if err != nil {
return errors.StructuralError("subkey signature invalid: " + err.Error())
}
sig, ok := p.(*packet.Signature)
if !ok {
// Hit a non-signature packet, so assume we're up to the next key
packets.Unread(p)
break
}
if st := sig.SigType; st != packet.SigTypeSubkeyBinding && st != packet.SigTypeSubkeyRevocation {
// Note(maxtaco):
// We used to error out here, but instead, let's fast-forward past
// packets that are in the wrong place (like misplaced 0x13 signatures)
// until we get to one that works. For a test case,
// see TestWithBadSubkeySignaturePackets.
continue
}
err = e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, sig)
if err != nil {
// Non valid signature, so again, no need to abandon all hope, just continue;
// make a note of the error we hit.
lastErr = errors.StructuralError("subkey signature invalid: " + err.Error())
continue
}
switch sig.SigType {
case packet.SigTypeSubkeyBinding:
// Does the "new" sig set expiration to later date than
// "previous" sig?
if subKey.Sig == nil || subKey.Sig.ExpiresBeforeOther(sig) {
subKey.Sig = sig
}
case packet.SigTypeSubkeyRevocation:
// First writer wins
if subKey.Revocation == nil {
subKey.Revocation = sig
}
}
}
if subKey.Sig != nil {
e.Subkeys = append(e.Subkeys, subKey)
} else {
if lastErr == nil {
lastErr = errors.StructuralError("Subkey wasn't signed; expected a 'binding' signature")
}
e.BadSubkeys = append(e.BadSubkeys, BadSubkey{Subkey: subKey, Err: lastErr})
}
return nil
}
const defaultRSAKeyBits = 2048
// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
// single identity composed of the given full name, comment and email, any of
// which may be empty but must not contain any of "()<>\x00".
// If config is nil, sensible defaults will be used.
func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
currentTime := config.Now()
bits := defaultRSAKeyBits
if config != nil && config.RSABits != 0 {
bits = config.RSABits
}
uid := packet.NewUserId(name, comment, email)
if uid == nil {
return nil, errors.InvalidArgumentError("user id field contained invalid characters")
}
signingPriv, err := rsa.GenerateKey(config.Random(), bits)
if err != nil {
return nil, err
}
encryptingPriv, err := rsa.GenerateKey(config.Random(), bits)
if err != nil {
return nil, err
}
e := &Entity{
PrimaryKey: packet.NewRSAPublicKey(currentTime, &signingPriv.PublicKey),
PrivateKey: packet.NewRSAPrivateKey(currentTime, signingPriv),
Identities: make(map[string]*Identity),
}
isPrimaryId := true
e.Identities[uid.Id] = &Identity{
Name: uid.Name,
UserId: uid,
SelfSignature: &packet.Signature{
CreationTime: currentTime,
SigType: packet.SigTypePositiveCert,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
IsPrimaryId: &isPrimaryId,
FlagsValid: true,
FlagSign: true,
FlagCertify: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
},
}
e.Subkeys = make([]Subkey, 1)
e.Subkeys[0] = Subkey{
PublicKey: packet.NewRSAPublicKey(currentTime, &encryptingPriv.PublicKey),
PrivateKey: packet.NewRSAPrivateKey(currentTime, encryptingPriv),
Sig: &packet.Signature{
CreationTime: currentTime,
SigType: packet.SigTypeSubkeyBinding,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
FlagsValid: true,
FlagEncryptStorage: true,
FlagEncryptCommunications: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
},
}
e.Subkeys[0].PublicKey.IsSubkey = true
e.Subkeys[0].PrivateKey.IsSubkey = true
return e, nil
}
// SerializePrivate serializes an Entity, including private key material, to
// the given Writer. For now, it must only be used on an Entity returned from
// NewEntity.
// If config is nil, sensible defaults will be used.
func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
err = e.PrivateKey.Serialize(w)
if err != nil {
return
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return
}
if e.PrivateKey.PrivateKey != nil {
err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
if err != nil {
return
}
}
err = ident.SelfSignature.Serialize(w)
if err != nil {
return
}
}
for _, subkey := range e.Subkeys {
err = subkey.PrivateKey.Serialize(w)
if err != nil {
return
}
// Workaround shortcoming of SignKey(), which doesn't work to reverse-sign
// sub-signing keys. So if requested, just reuse the signatures already
// available to us (if we read this key from a keyring).
if e.PrivateKey.PrivateKey != nil && !config.ReuseSignatures() {
err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
if err != nil {
return
}
}
if subkey.Revocation != nil {
err = subkey.Revocation.Serialize(w)
if err != nil {
return
}
}
err = subkey.Sig.Serialize(w)
if err != nil {
return
}
}
return nil
}
// Serialize writes the public part of the given Entity to w. (No private
// key material will be output).
func (e *Entity) Serialize(w io.Writer) error {
err := e.PrimaryKey.Serialize(w)
if err != nil {
return err
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return err
}
err = ident.SelfSignature.Serialize(w)
if err != nil {
return err
}
for _, sig := range ident.Signatures {
err = sig.Serialize(w)
if err != nil {
return err
}
}
}
for _, subkey := range e.Subkeys {
err = subkey.PublicKey.Serialize(w)
if err != nil {
return err
}
if subkey.Revocation != nil {
err = subkey.Revocation.Serialize(w)
if err != nil {
return err
}
}
err = subkey.Sig.Serialize(w)
if err != nil {
return err
}
}
return nil
}
// SignIdentity adds a signature to e, from signer, attesting that identity is
// associated with e. The provided identity must already be an element of
// e.Identities and the private key of signer must have been decrypted if
// necessary.
// If config is nil, sensible defaults will be used.
func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
if signer.PrivateKey == nil {
return errors.InvalidArgumentError("signing Entity must have a private key")
}
if signer.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
}
ident, ok := e.Identities[identity]
if !ok {
return errors.InvalidArgumentError("given identity string not found in Entity")
}
sig := &packet.Signature{
SigType: packet.SigTypeGenericCert,
PubKeyAlgo: signer.PrivateKey.PubKeyAlgo,
Hash: config.Hash(),
CreationTime: config.Now(),
IssuerKeyId: &signer.PrivateKey.KeyId,
}
if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
return err
}
ident.Signatures = append(ident.Signatures, sig)
return nil
}
// CopySubkeyRevocations copies subkey revocations from the src Entity over
// to the receiver entity. We need this because `gpg --export-secret-key` does
// not appear to output subkey revocations. In this case we need to manually
// merge with the output of `gpg --export`.
func (e *Entity) CopySubkeyRevocations(src *Entity) {
m := make(map[[20]byte]*packet.Signature)
for _, subkey := range src.Subkeys {
if subkey.Revocation != nil {
m[subkey.PublicKey.Fingerprint] = subkey.Revocation
}
}
for i, subkey := range e.Subkeys {
if r := m[subkey.PublicKey.Fingerprint]; r != nil {
e.Subkeys[i].Revocation = r
}
}
}
// CheckDesignatedRevokers will try to confirm any of designated
// revocation of entity. For this function to work, revocation
// issuer's key should be found in keyring. First successfully
// verified designated revocation is returned along with the key that
// verified it.
func FindVerifiedDesignatedRevoke(keyring KeyRing, entity *Entity) (*packet.Signature, *Key) {
for _, sig := range entity.UnverifiedRevocations {
if sig.IssuerKeyId == nil {
continue
}
issuerKeyId := *sig.IssuerKeyId
issuerFingerprint := sig.IssuerFingerprint
keys := keyring.KeysByIdUsage(issuerKeyId, issuerFingerprint, packet.KeyFlagSign)
if len(keys) == 0 {
continue
}
for _, key := range keys {
err := key.PublicKey.VerifyRevocationSignature(entity.PrimaryKey, sig)
if err == nil {
return sig, &key
}
}
}
return nil, nil
}

3
vendor/golang.org/x/crypto/openpgp/packet/compressed.go → vendor/github.com/keybase/go-crypto/openpgp/packet/compressed.go generated vendored
View file

@ -8,9 +8,10 @@ import (
"compress/bzip2"
"compress/flate"
"compress/zlib"
"golang.org/x/crypto/openpgp/errors"
"io"
"strconv"
"github.com/keybase/go-crypto/openpgp/errors"
)
// Compressed represents a compressed OpenPGP packet. The decompressed contents

7
vendor/golang.org/x/crypto/openpgp/packet/config.go → vendor/github.com/keybase/go-crypto/openpgp/packet/config.go generated vendored
View file

@ -46,6 +46,9 @@ type Config struct {
// RSABits is the number of bits in new RSA keys made with NewEntity.
// If zero, then 2048 bit keys are created.
RSABits int
// ReuseSignatures tells us to reuse existing Signatures
// on serialized output.
ReuseSignaturesOnSerialize bool
}
func (c *Config) Random() io.Reader {
@ -89,3 +92,7 @@ func (c *Config) PasswordHashIterations() int {
}
return c.S2KCount
}
func (c *Config) ReuseSignatures() bool {
return c != nil && c.ReuseSignaturesOnSerialize
}

104
vendor/github.com/keybase/go-crypto/openpgp/packet/ecdh.go generated vendored Normal file
View file

@ -0,0 +1,104 @@
package packet
import (
"bytes"
"io"
"math/big"
"github.com/keybase/go-crypto/openpgp/ecdh"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
)
// ECDHKdfParams generates KDF parameters sequence for given
// PublicKey. See https://tools.ietf.org/html/rfc6637#section-8
func ECDHKdfParams(pub *PublicKey) []byte {
buf := new(bytes.Buffer)
oid := pub.ec.oid
buf.WriteByte(byte(len(oid)))
buf.Write(oid)
buf.WriteByte(18) // ECDH TYPE
pub.ecdh.serialize(buf)
buf.WriteString("Anonymous Sender ")
buf.Write(pub.Fingerprint[:])
return buf.Bytes()
}
func decryptKeyECDH(priv *PrivateKey, X, Y *big.Int, C []byte) (out []byte, err error) {
ecdhpriv, ok := priv.PrivateKey.(*ecdh.PrivateKey)
if !ok {
return nil, errors.InvalidArgumentError("bad internal ECDH key")
}
Sx := ecdhpriv.DecryptShared(X, Y)
kdfParams := ECDHKdfParams(&priv.PublicKey)
hash, ok := s2k.HashIdToHash(byte(priv.ecdh.KdfHash))
if !ok {
return nil, errors.InvalidArgumentError("invalid hash id in private key")
}
key := ecdhpriv.KDF(Sx, kdfParams, hash)
keySize := CipherFunction(priv.ecdh.KdfAlgo).KeySize()
decrypted, err := ecdh.AESKeyUnwrap(key[:keySize], C)
if err != nil {
return nil, err
}
// We have to "read ahead" to discover real length of the
// encryption key and properly unpad buffer.
cipherFunc := CipherFunction(decrypted[0])
// +3 bytes = 1-byte cipher id and checksum 2-byte checksum.
out = ecdh.UnpadBuffer(decrypted, cipherFunc.KeySize()+3)
if out == nil {
return nil, errors.InvalidArgumentError("invalid padding while ECDH")
}
return out, nil
}
func serializeEncryptedKeyECDH(w io.Writer, rand io.Reader, header [10]byte, pub *PublicKey, keyBlock []byte) error {
ecdhpub := pub.PublicKey.(*ecdh.PublicKey)
kdfParams := ECDHKdfParams(pub)
hash, ok := s2k.HashIdToHash(byte(pub.ecdh.KdfHash))
if !ok {
return errors.InvalidArgumentError("invalid hash id in private key")
}
kdfKeySize := CipherFunction(pub.ecdh.KdfAlgo).KeySize()
Vx, Vy, C, err := ecdhpub.Encrypt(rand, kdfParams, keyBlock, hash, kdfKeySize)
if err != nil {
return err
}
mpis, mpiBitLen := ecdh.Marshal(ecdhpub.Curve, Vx, Vy)
packetLen := len(header) /* header length in bytes */
packetLen += 2 /* mpi length in bits */ + len(mpis)
packetLen += 1 /* ciphertext size in bytes */ + len(C)
err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
if err != nil {
return err
}
_, err = w.Write(header[:])
if err != nil {
return err
}
_, err = w.Write([]byte{byte(mpiBitLen >> 8), byte(mpiBitLen)})
if err != nil {
return err
}
_, err = w.Write(mpis[:])
if err != nil {
return err
}
w.Write([]byte{byte(len(C))})
w.Write(C[:])
return nil
}

35
vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go → vendor/github.com/keybase/go-crypto/openpgp/packet/encrypted_key.go generated vendored
View file

@ -5,14 +5,15 @@
package packet
import (
"crypto/rsa"
"encoding/binary"
"io"
"math/big"
"strconv"
"golang.org/x/crypto/openpgp/elgamal"
"golang.org/x/crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/ecdh"
"github.com/keybase/go-crypto/openpgp/elgamal"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/rsa"
)
const encryptedKeyVersion = 3
@ -26,6 +27,7 @@ type EncryptedKey struct {
Key []byte // only valid after a successful Decrypt
encryptedMPI1, encryptedMPI2 parsedMPI
ecdh_C []byte
}
func (e *EncryptedKey) parse(r io.Reader) (err error) {
@ -48,9 +50,25 @@ func (e *EncryptedKey) parse(r io.Reader) (err error) {
return
}
e.encryptedMPI2.bytes, e.encryptedMPI2.bitLength, err = readMPI(r)
case PubKeyAlgoECDH:
e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r)
if err != nil {
return err
}
_, err = readFull(r, buf[:1]) // read C len (1 byte)
if err != nil {
return err
}
e.ecdh_C = make([]byte, int(buf[0]))
_, err = readFull(r, e.ecdh_C)
}
if err != nil {
return err
}
_, err = consumeAll(r)
return
return err
}
func checksumKeyMaterial(key []byte) uint16 {
@ -77,6 +95,13 @@ func (e *EncryptedKey) Decrypt(priv *PrivateKey, config *Config) error {
c1 := new(big.Int).SetBytes(e.encryptedMPI1.bytes)
c2 := new(big.Int).SetBytes(e.encryptedMPI2.bytes)
b, err = elgamal.Decrypt(priv.PrivateKey.(*elgamal.PrivateKey), c1, c2)
case PubKeyAlgoECDH:
// Note: Unmarshal checks if point is on the curve.
c1, c2 := ecdh.Unmarshal(priv.PrivateKey.(*ecdh.PrivateKey).Curve, e.encryptedMPI1.bytes)
if c1 == nil {
return errors.InvalidArgumentError("failed to parse EC point for encryption key")
}
b, err = decryptKeyECDH(priv, c1, c2, e.ecdh_C)
default:
err = errors.InvalidArgumentError("cannot decrypted encrypted session key with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
}
@ -147,6 +172,8 @@ func SerializeEncryptedKey(w io.Writer, pub *PublicKey, cipherFunc CipherFunctio
return serializeEncryptedKeyRSA(w, config.Random(), buf, pub.PublicKey.(*rsa.PublicKey), keyBlock)
case PubKeyAlgoElGamal:
return serializeEncryptedKeyElGamal(w, config.Random(), buf, pub.PublicKey.(*elgamal.PublicKey), keyBlock)
case PubKeyAlgoECDH:
return serializeEncryptedKeyECDH(w, config.Random(), buf, pub, keyBlock)
case PubKeyAlgoDSA, PubKeyAlgoRSASignOnly:
return errors.InvalidArgumentError("cannot encrypt to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
}

0
vendor/golang.org/x/crypto/openpgp/packet/literal.go → vendor/github.com/keybase/go-crypto/openpgp/packet/literal.go generated vendored
View file

0
vendor/golang.org/x/crypto/openpgp/packet/ocfb.go → vendor/github.com/keybase/go-crypto/openpgp/packet/ocfb.go generated vendored
View file

5
vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go → vendor/github.com/keybase/go-crypto/openpgp/packet/one_pass_signature.go generated vendored
View file

@ -7,10 +7,11 @@ package packet
import (
"crypto"
"encoding/binary"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/s2k"
"io"
"strconv"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
)
// OnePassSignature represents a one-pass signature packet. See RFC 4880,

2
vendor/golang.org/x/crypto/openpgp/packet/opaque.go → vendor/github.com/keybase/go-crypto/openpgp/packet/opaque.go generated vendored
View file

@ -9,7 +9,7 @@ import (
"io"
"io/ioutil"
"golang.org/x/crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/errors"
)
// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is

58
vendor/golang.org/x/crypto/openpgp/packet/packet.go → vendor/github.com/keybase/go-crypto/openpgp/packet/packet.go generated vendored
View file

@ -4,17 +4,19 @@
// Package packet implements parsing and serialization of OpenPGP packets, as
// specified in RFC 4880.
package packet // import "golang.org/x/crypto/openpgp/packet"
package packet // import "github.com/keybase/go-crypto/openpgp/packet"
import (
"bufio"
"crypto/aes"
"crypto/cipher"
"crypto/des"
"golang.org/x/crypto/cast5"
"golang.org/x/crypto/openpgp/errors"
"crypto/elliptic"
"io"
"math/big"
"github.com/keybase/go-crypto/cast5"
"github.com/keybase/go-crypto/openpgp/errors"
)
// readFull is the same as io.ReadFull except that reading zero bytes returns
@ -273,6 +275,8 @@ func consumeAll(r io.Reader) (n int64, err error) {
return
}
}
panic("unreachable")
}
// packetType represents the numeric ids of the different OpenPGP packet types. See
@ -383,17 +387,18 @@ func Read(r io.Reader) (p Packet, err error) {
type SignatureType uint8
const (
SigTypeBinary SignatureType = 0
SigTypeText = 1
SigTypeGenericCert = 0x10
SigTypePersonaCert = 0x11
SigTypeCasualCert = 0x12
SigTypePositiveCert = 0x13
SigTypeSubkeyBinding = 0x18
SigTypePrimaryKeyBinding = 0x19
SigTypeDirectSignature = 0x1F
SigTypeKeyRevocation = 0x20
SigTypeSubkeyRevocation = 0x28
SigTypeBinary SignatureType = 0
SigTypeText = 1
SigTypeGenericCert = 0x10
SigTypePersonaCert = 0x11
SigTypeCasualCert = 0x12
SigTypePositiveCert = 0x13
SigTypeSubkeyBinding = 0x18
SigTypePrimaryKeyBinding = 0x19
SigTypeDirectSignature = 0x1F
SigTypeKeyRevocation = 0x20
SigTypeSubkeyRevocation = 0x28
SigTypeIdentityRevocation = 0x30
)
// PublicKeyAlgorithm represents the different public key system specified for
@ -410,13 +415,15 @@ const (
// RFC 6637, Section 5.
PubKeyAlgoECDH PublicKeyAlgorithm = 18
PubKeyAlgoECDSA PublicKeyAlgorithm = 19
// RFC -1
PubKeyAlgoEdDSA PublicKeyAlgorithm = 22
)
// CanEncrypt returns true if it's possible to encrypt a message to a public
// key of the given type.
func (pka PublicKeyAlgorithm) CanEncrypt() bool {
switch pka {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal:
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal, PubKeyAlgoECDH:
return true
}
return false
@ -426,7 +433,7 @@ func (pka PublicKeyAlgorithm) CanEncrypt() bool {
// sign a message.
func (pka PublicKeyAlgorithm) CanSign() bool {
switch pka {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA, PubKeyAlgoEdDSA:
return true
}
return false
@ -520,6 +527,25 @@ func writeMPI(w io.Writer, bitLength uint16, mpiBytes []byte) (err error) {
return
}
func WritePaddedBigInt(w io.Writer, length int, X *big.Int) (n int, err error) {
bytes := X.Bytes()
n1, err := w.Write(make([]byte, length-len(bytes)))
if err != nil {
return n1, err
}
n2, err := w.Write(bytes)
if err != nil {
return n2, err
}
return (n1 + n2), err
}
// Minimum number of bytes to fit the curve coordinates. All
// coordinates have to be 0-padded to this length.
func mpiPointByteLength(curve elliptic.Curve) int {
return (curve.Params().P.BitLen() + 7) / 8
}
// writeBig serializes a *big.Int to w.
func writeBig(w io.Writer, i *big.Int) error {
return writeMPI(w, uint16(i.BitLen()), i.Bytes())

272
vendor/golang.org/x/crypto/openpgp/packet/private_key.go → vendor/github.com/keybase/go-crypto/openpgp/packet/private_key.go generated vendored
View file

@ -6,21 +6,23 @@ package packet
import (
"bytes"
"crypto"
"crypto/cipher"
"crypto/dsa"
"crypto/ecdsa"
"crypto/rsa"
"crypto/sha1"
"fmt"
"io"
"io/ioutil"
"math/big"
"strconv"
"time"
"golang.org/x/crypto/openpgp/elgamal"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/s2k"
"github.com/keybase/go-crypto/ed25519"
"github.com/keybase/go-crypto/openpgp/ecdh"
"github.com/keybase/go-crypto/openpgp/elgamal"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
"github.com/keybase/go-crypto/rsa"
)
// PrivateKey represents a possibly encrypted private key. See RFC 4880,
@ -31,9 +33,32 @@ type PrivateKey struct {
encryptedData []byte
cipher CipherFunction
s2k func(out, in []byte)
PrivateKey interface{} // An *{rsa|dsa|ecdsa}.PrivateKey or a crypto.Signer.
PrivateKey interface{} // An *rsa.PrivateKey or *dsa.PrivateKey.
sha1Checksum bool
iv []byte
s2kHeader []byte
}
type EdDSAPrivateKey struct {
PrivateKey
seed parsedMPI
}
func (e *EdDSAPrivateKey) Sign(digest []byte) (R, S []byte, err error) {
r := bytes.NewReader(e.seed.bytes)
publicKey, privateKey, err := ed25519.GenerateKey(r)
if err != nil {
return nil, nil, err
}
if !bytes.Equal(publicKey, e.PublicKey.edk.p.bytes[1:]) { // [1:] because [0] is 0x40 mpi header
return nil, nil, errors.UnsupportedError("EdDSA: Private key does not match public key.")
}
sig := ed25519.Sign(privateKey, digest)
sigLen := ed25519.SignatureSize / 2
return sig[:sigLen], sig[sigLen:], nil
}
func NewRSAPrivateKey(currentTime time.Time, priv *rsa.PrivateKey) *PrivateKey {
@ -64,23 +89,6 @@ func NewECDSAPrivateKey(currentTime time.Time, priv *ecdsa.PrivateKey) *PrivateK
return pk
}
// NewSignerPrivateKey creates a sign-only PrivateKey from a crypto.Signer that
// implements RSA or ECDSA.
func NewSignerPrivateKey(currentTime time.Time, signer crypto.Signer) *PrivateKey {
pk := new(PrivateKey)
switch pubkey := signer.Public().(type) {
case rsa.PublicKey:
pk.PublicKey = *NewRSAPublicKey(currentTime, &pubkey)
pk.PubKeyAlgo = PubKeyAlgoRSASignOnly
case ecdsa.PublicKey:
pk.PublicKey = *NewECDSAPublicKey(currentTime, &pubkey)
default:
panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey")
}
pk.PrivateKey = signer
return pk
}
func (pk *PrivateKey) parse(r io.Reader) (err error) {
err = (&pk.PublicKey).parse(r)
if err != nil {
@ -112,10 +120,16 @@ func (pk *PrivateKey) parse(r io.Reader) (err error) {
if s2kType == 254 {
pk.sha1Checksum = true
}
// S2K == nil implies that we got a "GNU Dummy" S2K. For instance,
// because our master secret key is on a USB key in a vault somewhere.
// In that case, there is no further data to consume here.
if pk.s2k == nil {
pk.Encrypted = false
return
}
default:
return errors.UnsupportedError("deprecated s2k function in private key")
}
if pk.Encrypted {
blockSize := pk.cipher.blockSize()
if blockSize == 0 {
@ -148,31 +162,105 @@ func mod64kHash(d []byte) uint16 {
return h
}
// Encrypt is the counterpart to the Decrypt() method below. It encrypts
// the private key with the provided passphrase. If config is nil, then
// the standard, and sensible, defaults apply.
//
// A key will be derived from the given passphrase using S2K Specifier
// Type 3 (Iterated + Salted, see RFC-4880 Sec. 3.7.1.3). This choice
// is hardcoded in s2k.Serialize(). S2KCount is hardcoded to 0, which is
// equivalent to 65536. And the hash algorithm for key-derivation can be
// set with config. The encrypted PrivateKey, using the algorithm specified
// in config (if provided), is written out to the encryptedData member.
// When Serialize() is called, this encryptedData member will be
// serialized, using S2K Usage value of 254, and thus SHA1 checksum.
func (pk *PrivateKey) Encrypt(passphrase []byte, config *Config) (err error) {
if pk.PrivateKey == nil {
return errors.InvalidArgumentError("there is no private key to encrypt")
}
pk.sha1Checksum = true
pk.cipher = config.Cipher()
s2kConfig := s2k.Config{
Hash: config.Hash(),
S2KCount: 0,
}
s2kBuf := bytes.NewBuffer(nil)
derivedKey := make([]byte, pk.cipher.KeySize())
err = s2k.Serialize(s2kBuf, derivedKey, config.Random(), passphrase, &s2kConfig)
if err != nil {
return err
}
pk.s2kHeader = s2kBuf.Bytes()
// No good way to set pk.s2k but to call s2k.Parse(),
// even though we have all the information here, but
// most of the functions needed are private to s2k.
pk.s2k, err = s2k.Parse(s2kBuf)
pk.iv = make([]byte, pk.cipher.blockSize())
if _, err = config.Random().Read(pk.iv); err != nil {
return err
}
privateKeyBuf := bytes.NewBuffer(nil)
if err = pk.serializePrivateKey(privateKeyBuf); err != nil {
return err
}
checksum := sha1.Sum(privateKeyBuf.Bytes())
if _, err = privateKeyBuf.Write(checksum[:]); err != nil {
return err
}
pkData := privateKeyBuf.Bytes()
block := pk.cipher.new(derivedKey)
pk.encryptedData = make([]byte, len(pkData))
cfb := cipher.NewCFBEncrypter(block, pk.iv)
cfb.XORKeyStream(pk.encryptedData, pkData)
pk.Encrypted = true
return nil
}
func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
// TODO(agl): support encrypted private keys
buf := bytes.NewBuffer(nil)
err = pk.PublicKey.serializeWithoutHeaders(buf)
if err != nil {
return
}
buf.WriteByte(0 /* no encryption */)
privateKeyBuf := bytes.NewBuffer(nil)
switch priv := pk.PrivateKey.(type) {
case *rsa.PrivateKey:
err = serializeRSAPrivateKey(privateKeyBuf, priv)
case *dsa.PrivateKey:
err = serializeDSAPrivateKey(privateKeyBuf, priv)
case *elgamal.PrivateKey:
err = serializeElGamalPrivateKey(privateKeyBuf, priv)
case *ecdsa.PrivateKey:
err = serializeECDSAPrivateKey(privateKeyBuf, priv)
default:
err = errors.InvalidArgumentError("unknown private key type")
}
if err != nil {
return
if pk.PrivateKey == nil {
_, err = buf.Write([]byte{
254, // SHA-1 Convention
9, // Encryption scheme (AES256)
101, // GNU Extensions
2, // Hash value (SHA1)
'G', 'N', 'U', // "GNU" as a string
1, // Extension type 1001 (minus 1000)
})
} else if pk.Encrypted {
_, err = buf.Write([]byte{
254, // SHA-1 Convention
byte(pk.cipher), // Encryption scheme
})
if err != nil {
return err
}
if _, err = buf.Write(pk.s2kHeader); err != nil {
return err
}
if _, err = buf.Write(pk.iv); err != nil {
return err
}
if _, err = privateKeyBuf.Write(pk.encryptedData); err != nil {
return err
}
} else {
buf.WriteByte(0 /* no encryption */)
if err = pk.serializePrivateKey(privateKeyBuf); err != nil {
return err
}
}
ptype := packetTypePrivateKey
@ -181,7 +269,11 @@ func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
if pk.IsSubkey {
ptype = packetTypePrivateSubkey
}
err = serializeHeader(w, ptype, len(contents)+len(privateKeyBytes)+2)
totalLen := len(contents) + len(privateKeyBytes)
if !pk.Encrypted {
totalLen += 2
}
err = serializeHeader(w, ptype, totalLen)
if err != nil {
return
}
@ -194,15 +286,38 @@ func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
return
}
checksum := mod64kHash(privateKeyBytes)
var checksumBytes [2]byte
checksumBytes[0] = byte(checksum >> 8)
checksumBytes[1] = byte(checksum)
_, err = w.Write(checksumBytes[:])
if len(privateKeyBytes) > 0 && !pk.Encrypted {
checksum := mod64kHash(privateKeyBytes)
var checksumBytes [2]byte
checksumBytes[0] = byte(checksum >> 8)
checksumBytes[1] = byte(checksum)
_, err = w.Write(checksumBytes[:])
}
return
}
func (pk *PrivateKey) serializePrivateKey(w io.Writer) (err error) {
switch priv := pk.PrivateKey.(type) {
case *rsa.PrivateKey:
err = serializeRSAPrivateKey(w, priv)
case *dsa.PrivateKey:
err = serializeDSAPrivateKey(w, priv)
case *elgamal.PrivateKey:
err = serializeElGamalPrivateKey(w, priv)
case *ecdsa.PrivateKey:
err = serializeECDSAPrivateKey(w, priv)
case *ecdh.PrivateKey:
err = serializeECDHPrivateKey(w, priv)
case *EdDSAPrivateKey:
err = serializeEdDSAPrivateKey(w, priv)
default:
err = errors.InvalidArgumentError("unknown private key type")
}
return err
}
func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error {
err := writeBig(w, priv.D)
if err != nil {
@ -231,11 +346,23 @@ func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error {
return writeBig(w, priv.D)
}
func serializeECDHPrivateKey(w io.Writer, priv *ecdh.PrivateKey) error {
return writeBig(w, priv.X)
}
func serializeEdDSAPrivateKey(w io.Writer, priv *EdDSAPrivateKey) error {
return writeMPI(w, priv.seed.bitLength, priv.seed.bytes)
}
// Decrypt decrypts an encrypted private key using a passphrase.
func (pk *PrivateKey) Decrypt(passphrase []byte) error {
if !pk.Encrypted {
return nil
}
// For GNU Dummy S2K, there's no key here, so don't do anything.
if pk.s2k == nil {
return nil
}
key := make([]byte, pk.cipher.KeySize())
pk.s2k(key, passphrase)
@ -284,6 +411,10 @@ func (pk *PrivateKey) parsePrivateKey(data []byte) (err error) {
return pk.parseElGamalPrivateKey(data)
case PubKeyAlgoECDSA:
return pk.parseECDSAPrivateKey(data)
case PubKeyAlgoECDH:
return pk.parseECDHPrivateKey(data)
case PubKeyAlgoEdDSA:
return pk.parseEdDSAPrivateKey(data)
}
panic("impossible")
}
@ -360,8 +491,10 @@ func (pk *PrivateKey) parseElGamalPrivateKey(data []byte) (err error) {
return nil
}
func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
func (pk *PrivateKey) parseECDHPrivateKey(data []byte) (err error) {
pub := pk.PublicKey.PublicKey.(*ecdh.PublicKey)
priv := new(ecdh.PrivateKey)
priv.PublicKey = *pub
buf := bytes.NewBuffer(data)
d, _, err := readMPI(buf)
@ -369,10 +502,47 @@ func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
return
}
pk.PrivateKey = &ecdsa.PrivateKey{
PublicKey: *ecdsaPub,
D: new(big.Int).SetBytes(d),
priv.X = new(big.Int).SetBytes(d)
pk.PrivateKey = priv
pk.Encrypted = false
pk.encryptedData = nil
return nil
}
func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
ecdsaPriv := new(ecdsa.PrivateKey)
ecdsaPriv.PublicKey = *ecdsaPub
buf := bytes.NewBuffer(data)
d, _, err := readMPI(buf)
if err != nil {
return
}
ecdsaPriv.D = new(big.Int).SetBytes(d)
pk.PrivateKey = ecdsaPriv
pk.Encrypted = false
pk.encryptedData = nil
return nil
}
func (pk *PrivateKey) parseEdDSAPrivateKey(data []byte) (err error) {
eddsaPriv := new(EdDSAPrivateKey)
eddsaPriv.PublicKey = pk.PublicKey
buf := bytes.NewBuffer(data)
eddsaPriv.seed.bytes, eddsaPriv.seed.bitLength, err = readMPI(buf)
if err != nil {
return err
}
if bLen := len(eddsaPriv.seed.bytes); bLen != 32 { // 32 bytes private part of ed25519 key.
return errors.UnsupportedError(fmt.Sprintf("Unexpected EdDSA private key length: %d", bLen))
}
pk.PrivateKey = eddsaPriv
pk.Encrypted = false
pk.encryptedData = nil

258
vendor/golang.org/x/crypto/openpgp/packet/public_key.go → vendor/github.com/keybase/go-crypto/openpgp/packet/public_key.go generated vendored
View file

@ -10,7 +10,6 @@ import (
"crypto/dsa"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rsa"
"crypto/sha1"
_ "crypto/sha256"
_ "crypto/sha512"
@ -22,8 +21,13 @@ import (
"strconv"
"time"
"golang.org/x/crypto/openpgp/elgamal"
"golang.org/x/crypto/openpgp/errors"
"github.com/keybase/go-crypto/brainpool"
"github.com/keybase/go-crypto/curve25519"
"github.com/keybase/go-crypto/ed25519"
"github.com/keybase/go-crypto/openpgp/ecdh"
"github.com/keybase/go-crypto/openpgp/elgamal"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/rsa"
)
var (
@ -33,9 +37,19 @@ var (
oidCurveP384 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x22}
// NIST curve P-521
oidCurveP521 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x23}
// Brainpool curve P-256r1
oidCurveP256r1 []byte = []byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x07}
// Brainpool curve P-384r1
oidCurveP384r1 []byte = []byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0B}
// Brainpool curve P-512r1
oidCurveP512r1 []byte = []byte{0x2B, 0x24, 0x03, 0x03, 0x02, 0x08, 0x01, 0x01, 0x0D}
// EdDSA
oidEdDSA []byte = []byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0xDA, 0x47, 0x0F, 0x01}
// cv25519
oidCurve25519 []byte = []byte{0x2B, 0x06, 0x01, 0x04, 0x01, 0x97, 0x55, 0x01, 0x05, 0x01}
)
const maxOIDLength = 8
const maxOIDLength = 10
// ecdsaKey stores the algorithm-specific fields for ECDSA keys.
// as defined in RFC 6637, Section 9.
@ -46,6 +60,38 @@ type ecdsaKey struct {
p parsedMPI
}
type edDSAkey struct {
ecdsaKey
}
func copyFrontFill(dst, src []byte, length int) int {
if srcLen := len(src); srcLen < length {
return copy(dst[length-srcLen:], src[:])
} else {
return copy(dst[:], src[:])
}
}
func (e *edDSAkey) Verify(payload []byte, r parsedMPI, s parsedMPI) bool {
const halfSigSize = ed25519.SignatureSize / 2
var sig [ed25519.SignatureSize]byte
// NOTE: The first byte is 0x40 - MPI header
// TODO: Maybe clean the code up and use 0x40 as a header when
// reading and keep only actual number in p field. Find out how
// other MPIs are stored.
key := e.p.bytes[1:]
// Note: it may happen that R + S do not form 64-byte signature buffer that
// ed25519 expects, but because we copy it over to an array of exact size,
// we will always pass correctly sized slice to Verify. Slice too short
// would make ed25519 panic().
copyFrontFill(sig[:halfSigSize], r.bytes, halfSigSize)
copyFrontFill(sig[halfSigSize:], s.bytes, halfSigSize)
return ed25519.Verify(key, payload, sig[:])
}
// parseOID reads the OID for the curve as defined in RFC 6637, Section 9.
func parseOID(r io.Reader) (oid []byte, err error) {
buf := make([]byte, maxOIDLength)
@ -67,7 +113,7 @@ func (f *ecdsaKey) parse(r io.Reader) (err error) {
return err
}
f.p.bytes, f.p.bitLength, err = readMPI(r)
return
return err
}
func (f *ecdsaKey) serialize(w io.Writer) (err error) {
@ -80,17 +126,34 @@ func (f *ecdsaKey) serialize(w io.Writer) (err error) {
return writeMPIs(w, f.p)
}
func getCurveByOid(oid []byte) elliptic.Curve {
switch {
case bytes.Equal(oid, oidCurveP256):
return elliptic.P256()
case bytes.Equal(oid, oidCurveP384):
return elliptic.P384()
case bytes.Equal(oid, oidCurveP521):
return elliptic.P521()
case bytes.Equal(oid, oidCurveP256r1):
return brainpool.P256r1()
case bytes.Equal(oid, oidCurveP384r1):
return brainpool.P384r1()
case bytes.Equal(oid, oidCurveP512r1):
return brainpool.P512r1()
case bytes.Equal(oid, oidCurve25519):
return curve25519.Cv25519()
default:
return nil
}
}
func (f *ecdsaKey) newECDSA() (*ecdsa.PublicKey, error) {
var c elliptic.Curve
if bytes.Equal(f.oid, oidCurveP256) {
c = elliptic.P256()
} else if bytes.Equal(f.oid, oidCurveP384) {
c = elliptic.P384()
} else if bytes.Equal(f.oid, oidCurveP521) {
c = elliptic.P521()
} else {
var c = getCurveByOid(f.oid)
// Curve25519 should not be used in ECDSA.
if c == nil || bytes.Equal(f.oid, oidCurve25519) {
return nil, errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", f.oid))
}
// Note: Unmarshal already checks if point is on curve.
x, y := elliptic.Unmarshal(c, f.p.bytes)
if x == nil {
return nil, errors.UnsupportedError("failed to parse EC point")
@ -98,6 +161,20 @@ func (f *ecdsaKey) newECDSA() (*ecdsa.PublicKey, error) {
return &ecdsa.PublicKey{Curve: c, X: x, Y: y}, nil
}
func (f *ecdsaKey) newECDH() (*ecdh.PublicKey, error) {
var c = getCurveByOid(f.oid)
if c == nil {
return nil, errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", f.oid))
}
// ecdh.Unmarshal handles unmarshaling for all curve types. It
// also checks if point is on curve.
x, y := ecdh.Unmarshal(c, f.p.bytes)
if x == nil {
return nil, errors.UnsupportedError("failed to parse EC point")
}
return &ecdh.PublicKey{Curve: c, X: x, Y: y}, nil
}
func (f *ecdsaKey) byteLen() int {
return 1 + len(f.oid) + 2 + len(f.p.bytes)
}
@ -163,6 +240,9 @@ type PublicKey struct {
// RFC 6637 fields
ec *ecdsaKey
ecdh *ecdhKdf
// EdDSA fields (no RFC available), uses ecdsa scaffolding
edk *edDSAkey
}
// signingKey provides a convenient abstraction over signature verification
@ -172,21 +252,28 @@ type signingKey interface {
serializeWithoutHeaders(io.Writer) error
}
func fromBig(n *big.Int) parsedMPI {
func FromBig(n *big.Int) parsedMPI {
return parsedMPI{
bytes: n.Bytes(),
bitLength: uint16(n.BitLen()),
}
}
func FromBytes(bytes []byte) parsedMPI {
return parsedMPI{
bytes: bytes,
bitLength: uint16(8 * len(bytes)),
}
}
// NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey.
func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey) *PublicKey {
pk := &PublicKey{
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoRSA,
PublicKey: pub,
n: fromBig(pub.N),
e: fromBig(big.NewInt(int64(pub.E))),
n: FromBig(pub.N),
e: FromBig(big.NewInt(int64(pub.E))),
}
pk.setFingerPrintAndKeyId()
@ -199,25 +286,38 @@ func NewDSAPublicKey(creationTime time.Time, pub *dsa.PublicKey) *PublicKey {
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoDSA,
PublicKey: pub,
p: fromBig(pub.P),
q: fromBig(pub.Q),
g: fromBig(pub.G),
y: fromBig(pub.Y),
p: FromBig(pub.P),
q: FromBig(pub.Q),
g: FromBig(pub.G),
y: FromBig(pub.Y),
}
pk.setFingerPrintAndKeyId()
return pk
}
// check EdDSA public key material.
// There is currently no RFC for it, but it doesn't mean it's not
// implemented or in use.
func (e *edDSAkey) check() error {
if !bytes.Equal(e.oid, oidEdDSA) {
return errors.UnsupportedError(fmt.Sprintf("Bad OID for EdDSA key: %v", e.oid))
}
if bLen := len(e.p.bytes); bLen != 33 { // 32 bytes for ed25519 key and 1 byte for 0x40 header
return errors.UnsupportedError(fmt.Sprintf("Unexpected EdDSA public key length: %d", bLen))
}
return nil
}
// NewElGamalPublicKey returns a PublicKey that wraps the given elgamal.PublicKey.
func NewElGamalPublicKey(creationTime time.Time, pub *elgamal.PublicKey) *PublicKey {
pk := &PublicKey{
CreationTime: creationTime,
PubKeyAlgo: PubKeyAlgoElGamal,
PublicKey: pub,
p: fromBig(pub.P),
g: fromBig(pub.G),
y: fromBig(pub.Y),
p: FromBig(pub.P),
g: FromBig(pub.G),
y: FromBig(pub.Y),
}
pk.setFingerPrintAndKeyId()
@ -231,7 +331,6 @@ func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey
PublicKey: pub,
ec: new(ecdsaKey),
}
switch pub.Curve {
case elliptic.P256():
pk.ec.oid = oidCurveP256
@ -239,10 +338,13 @@ func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey
pk.ec.oid = oidCurveP384
case elliptic.P521():
pk.ec.oid = oidCurveP521
default:
panic("unknown elliptic curve")
case brainpool.P256r1():
pk.ec.oid = oidCurveP256r1
case brainpool.P384r1():
pk.ec.oid = oidCurveP384r1
case brainpool.P512r1():
pk.ec.oid = oidCurveP512r1
}
pk.ec.p.bytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
pk.ec.p.bitLength = uint16(8 * len(pk.ec.p.bytes))
@ -269,6 +371,12 @@ func (pk *PublicKey) parse(r io.Reader) (err error) {
err = pk.parseDSA(r)
case PubKeyAlgoElGamal:
err = pk.parseElGamal(r)
case PubKeyAlgoEdDSA:
pk.edk = new(edDSAkey)
if err = pk.edk.parse(r); err != nil {
return err
}
err = pk.edk.check()
case PubKeyAlgoECDSA:
pk.ec = new(ecdsaKey)
if err = pk.ec.parse(r); err != nil {
@ -284,8 +392,7 @@ func (pk *PublicKey) parse(r io.Reader) (err error) {
if err = pk.ecdh.parse(r); err != nil {
return
}
// The ECDH key is stored in an ecdsa.PublicKey for convenience.
pk.PublicKey, err = pk.ec.newECDSA()
pk.PublicKey, err = pk.ec.newECDH()
default:
err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
}
@ -318,7 +425,7 @@ func (pk *PublicKey) parseRSA(r io.Reader) (err error) {
return
}
if len(pk.e.bytes) > 3 {
if len(pk.e.bytes) > 7 {
err = errors.UnsupportedError("large public exponent")
return
}
@ -328,7 +435,7 @@ func (pk *PublicKey) parseRSA(r io.Reader) (err error) {
}
for i := 0; i < len(pk.e.bytes); i++ {
rsa.E <<= 8
rsa.E |= int(pk.e.bytes[i])
rsa.E |= int64(pk.e.bytes[i])
}
pk.PublicKey = rsa
return
@ -410,6 +517,8 @@ func (pk *PublicKey) SerializeSignaturePrefix(h io.Writer) {
case PubKeyAlgoECDH:
pLength += uint16(pk.ec.byteLen())
pLength += uint16(pk.ecdh.byteLen())
case PubKeyAlgoEdDSA:
pLength += uint16(pk.edk.byteLen())
default:
panic("unknown public key algorithm")
}
@ -439,6 +548,8 @@ func (pk *PublicKey) Serialize(w io.Writer) (err error) {
case PubKeyAlgoECDH:
length += pk.ec.byteLen()
length += pk.ecdh.byteLen()
case PubKeyAlgoEdDSA:
length += pk.edk.byteLen()
default:
panic("unknown public key algorithm")
}
@ -480,6 +591,8 @@ func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) {
return writeMPIs(w, pk.p, pk.g, pk.y)
case PubKeyAlgoECDSA:
return pk.ec.serialize(w)
case PubKeyAlgoEdDSA:
return pk.edk.serialize(w)
case PubKeyAlgoECDH:
if err = pk.ec.serialize(w); err != nil {
return
@ -504,9 +617,18 @@ func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err erro
signed.Write(sig.HashSuffix)
hashBytes := signed.Sum(nil)
if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
return errors.SignatureError("hash tag doesn't match")
}
// NOTE(maxtaco) 2016-08-22
//
// We used to do this:
//
// if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
// return errors.SignatureError("hash tag doesn't match")
// }
//
// But don't do anything in this case. Some GPGs generate bad
// 2-byte hash prefixes, but GPG also doesn't seem to care on
// import. See BrentMaxwell's key. I think it's safe to disable
// this check!
if pk.PubKeyAlgo != sig.PubKeyAlgo {
return errors.InvalidArgumentError("public key and signature use different algorithms")
@ -537,9 +659,15 @@ func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err erro
return errors.SignatureError("ECDSA verification failure")
}
return nil
case PubKeyAlgoEdDSA:
if !pk.edk.Verify(hashBytes, sig.EdDSASigR, sig.EdDSASigS) {
return errors.SignatureError("EdDSA verification failure")
}
return nil
default:
return errors.SignatureError("Unsupported public key algorithm used in signature")
}
panic("unreachable")
}
// VerifySignatureV3 returns nil iff sig is a valid signature, made by this
@ -584,6 +712,7 @@ func (pk *PublicKey) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err
default:
panic("shouldn't happen")
}
panic("unreachable")
}
// keySignatureHash returns a Hash of the message that needs to be signed for
@ -594,12 +723,18 @@ func keySignatureHash(pk, signed signingKey, hashFunc crypto.Hash) (h hash.Hash,
}
h = hashFunc.New()
updateKeySignatureHash(pk, signed, h)
return
}
// updateKeySignatureHash does the actual hash updates for keySignatureHash.
func updateKeySignatureHash(pk, signed signingKey, h hash.Hash) {
// RFC 4880, section 5.2.4
pk.SerializeSignaturePrefix(h)
pk.serializeWithoutHeaders(h)
signed.SerializeSignaturePrefix(h)
signed.serializeWithoutHeaders(h)
return
}
// VerifyKeySignature returns nil iff sig is a valid signature, made by this
@ -614,6 +749,19 @@ func (pk *PublicKey) VerifyKeySignature(signed *PublicKey, sig *Signature) error
}
if sig.FlagSign {
// BUG(maxtaco)
//
// We should check for more than FlagsSign here, because if
// you read keys.go, we can sometimes use signing subkeys even if they're
// not explicitly flagged as such. However, so doing fails lots of currently
// working tests, so I'm not going to do much here.
//
// In other words, we should have this disjunction in the condition above:
//
// || (!sig.FlagsValid && pk.PubKeyAlgo.CanSign()) {
//
// Signing subkeys must be cross-signed. See
// https://www.gnupg.org/faq/subkey-cross-certify.html.
if sig.EmbeddedSignature == nil {
@ -648,14 +796,27 @@ func keyRevocationHash(pk signingKey, hashFunc crypto.Hash) (h hash.Hash, err er
// VerifyRevocationSignature returns nil iff sig is a valid signature, made by this
// public key.
func (pk *PublicKey) VerifyRevocationSignature(sig *Signature) (err error) {
h, err := keyRevocationHash(pk, sig.Hash)
func (pk *PublicKey) VerifyRevocationSignature(revokedKey *PublicKey, sig *Signature) (err error) {
h, err := keyRevocationHash(revokedKey, sig.Hash)
if err != nil {
return err
}
return pk.VerifySignature(h, sig)
}
type teeHash struct {
h hash.Hash
}
func (t teeHash) Write(b []byte) (n int, err error) {
fmt.Printf("hash -> %s %+v\n", string(b), b)
return t.h.Write(b)
}
func (t teeHash) Sum(b []byte) []byte { return t.h.Sum(b) }
func (t teeHash) Reset() { t.h.Reset() }
func (t teeHash) Size() int { return t.h.Size() }
func (t teeHash) BlockSize() int { return t.h.BlockSize() }
// userIdSignatureHash returns a Hash of the message that needs to be signed
// to assert that pk is a valid key for id.
func userIdSignatureHash(id string, pk *PublicKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
@ -664,6 +825,14 @@ func userIdSignatureHash(id string, pk *PublicKey, hashFunc crypto.Hash) (h hash
}
h = hashFunc.New()
updateUserIdSignatureHash(id, pk, h)
return
}
// updateUserIdSignatureHash does the actual hash updates for
// userIdSignatureHash.
func updateUserIdSignatureHash(id string, pk *PublicKey, h hash.Hash) {
// RFC 4880, section 5.2.4
pk.SerializeSignaturePrefix(h)
pk.serializeWithoutHeaders(h)
@ -732,7 +901,9 @@ func writeMPIs(w io.Writer, mpis ...parsedMPI) (err error) {
return
}
// BitLength returns the bit length for the given public key.
// BitLength returns the bit length for the given public key. Used for
// displaying key information, actual buffers and BigInts inside may
// have non-matching different size if the key is invalid.
func (pk *PublicKey) BitLength() (bitLength uint16, err error) {
switch pk.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
@ -741,6 +912,17 @@ func (pk *PublicKey) BitLength() (bitLength uint16, err error) {
bitLength = pk.p.bitLength
case PubKeyAlgoElGamal:
bitLength = pk.p.bitLength
case PubKeyAlgoECDH:
ecdhPublicKey := pk.PublicKey.(*ecdh.PublicKey)
bitLength = uint16(ecdhPublicKey.Curve.Params().BitSize)
case PubKeyAlgoECDSA:
ecdsaPublicKey := pk.PublicKey.(*ecdsa.PublicKey)
bitLength = uint16(ecdsaPublicKey.Curve.Params().BitSize)
case PubKeyAlgoEdDSA:
// EdDSA only support ed25519 curves right now, just return
// the length. Also, we don't have any PublicKey.Curve object
// to look the size up from.
bitLength = 256
default:
err = errors.InvalidArgumentError("bad public-key algorithm")
}

13
vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go → vendor/github.com/keybase/go-crypto/openpgp/packet/public_key_v3.go generated vendored
View file

@ -7,7 +7,6 @@ package packet
import (
"crypto"
"crypto/md5"
"crypto/rsa"
"encoding/binary"
"fmt"
"hash"
@ -16,7 +15,8 @@ import (
"strconv"
"time"
"golang.org/x/crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/rsa"
)
// PublicKeyV3 represents older, version 3 public keys. These keys are less secure and
@ -42,8 +42,8 @@ func newRSAPublicKeyV3(creationTime time.Time, pub *rsa.PublicKey) *PublicKeyV3
pk := &PublicKeyV3{
CreationTime: creationTime,
PublicKey: pub,
n: fromBig(pub.N),
e: fromBig(big.NewInt(int64(pub.E))),
n: FromBig(pub.N),
e: FromBig(big.NewInt(int64(pub.E))),
}
pk.setFingerPrintAndKeyId()
@ -100,14 +100,14 @@ func (pk *PublicKeyV3) parseRSA(r io.Reader) (err error) {
if len(pk.n.bytes) < 8 {
return errors.StructuralError("v3 public key modulus is too short")
}
if len(pk.e.bytes) > 3 {
if len(pk.e.bytes) > 7 {
err = errors.UnsupportedError("large public exponent")
return
}
rsa := &rsa.PublicKey{N: new(big.Int).SetBytes(pk.n.bytes)}
for i := 0; i < len(pk.e.bytes); i++ {
rsa.E <<= 8
rsa.E |= int(pk.e.bytes[i])
rsa.E |= int64(pk.e.bytes[i])
}
pk.PublicKey = rsa
return
@ -216,6 +216,7 @@ func (pk *PublicKeyV3) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (er
// V3 public keys only support RSA.
panic("shouldn't happen")
}
panic("unreachable")
}
// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this

4
vendor/golang.org/x/crypto/openpgp/packet/reader.go → vendor/github.com/keybase/go-crypto/openpgp/packet/reader.go generated vendored
View file

@ -5,8 +5,9 @@
package packet
import (
"golang.org/x/crypto/openpgp/errors"
"io"
"github.com/keybase/go-crypto/openpgp/errors"
)
// Reader reads packets from an io.Reader and allows packets to be 'unread' so
@ -46,7 +47,6 @@ func (r *Reader) Next() (p Packet, err error) {
return nil, err
}
}
return nil, io.EOF
}

245
vendor/golang.org/x/crypto/openpgp/packet/signature.go → vendor/github.com/keybase/go-crypto/openpgp/packet/signature.go generated vendored
View file

@ -9,16 +9,15 @@ import (
"crypto"
"crypto/dsa"
"crypto/ecdsa"
"encoding/asn1"
"encoding/binary"
"hash"
"io"
"math/big"
"strconv"
"time"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/s2k"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
"github.com/keybase/go-crypto/rsa"
)
const (
@ -29,6 +28,29 @@ const (
KeyFlagEncryptStorage
)
// Signer can be implemented by application code to do actual signing.
type Signer interface {
hash.Hash
Sign(sig *Signature) error
KeyId() uint64
PublicKeyAlgo() PublicKeyAlgorithm
}
// RevocationKey represents designated revoker packet. See RFC 4880
// section 5.2.3.15 for details.
type RevocationKey struct {
Class byte
PublicKeyAlgo PublicKeyAlgorithm
Fingerprint []byte
}
// KeyFlagBits holds boolean whether any usage flags were provided in
// the signature and BitField with KeyFlag* flags.
type KeyFlagBits struct {
Valid bool
BitField byte
}
// Signature represents a signature. See RFC 4880, section 5.2.
type Signature struct {
SigType SignatureType
@ -45,6 +67,7 @@ type Signature struct {
RSASignature parsedMPI
DSASigR, DSASigS parsedMPI
ECDSASigR, ECDSASigS parsedMPI
EdDSASigR, EdDSASigS parsedMPI
// rawSubpackets contains the unparsed subpackets, in order.
rawSubpackets []outputSubpacket
@ -54,8 +77,10 @@ type Signature struct {
SigLifetimeSecs, KeyLifetimeSecs *uint32
PreferredSymmetric, PreferredHash, PreferredCompression []uint8
PreferredKeyServer string
IssuerKeyId *uint64
IsPrimaryId *bool
IssuerFingerprint []byte
// FlagsValid is set if any flags were given. See RFC 4880, section
// 5.2.3.21 for details.
@ -67,6 +92,12 @@ type Signature struct {
RevocationReason *uint8
RevocationReasonText string
// PolicyURI is optional. See RFC 4880, Section 5.2.3.20 for details
PolicyURI string
// Regex is a regex that can match a PGP UID. See RFC 4880, 5.2.3.14 for details
Regex string
// MDC is set if this signature has a feature packet that indicates
// support for MDC subpackets.
MDC bool
@ -76,6 +107,16 @@ type Signature struct {
// subkey as their own.
EmbeddedSignature *Signature
// StubbedOutCriticalError is not fail-stop, since it shouldn't break key parsing
// when appearing in WoT-style cross signatures. But it should prevent a signature
// from being applied to a primary or subkey.
StubbedOutCriticalError error
// DesignaterRevoker will be present if this signature certifies a
// designated revoking key id (3rd party key that can sign
// revocation for this key).
DesignatedRevoker *RevocationKey
outSubpackets []outputSubpacket
}
@ -98,7 +139,7 @@ func (sig *Signature) parse(r io.Reader) (err error) {
sig.SigType = SignatureType(buf[0])
sig.PubKeyAlgo = PublicKeyAlgorithm(buf[1])
switch sig.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA, PubKeyAlgoEdDSA:
default:
err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
return
@ -162,6 +203,11 @@ func (sig *Signature) parse(r io.Reader) (err error) {
if err == nil {
sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r)
}
case PubKeyAlgoEdDSA:
sig.EdDSASigR.bytes, sig.EdDSASigR.bitLength, err = readMPI(r)
if err == nil {
sig.EdDSASigS.bytes, sig.EdDSASigS.bitLength, err = readMPI(r)
}
case PubKeyAlgoECDSA:
sig.ECDSASigR.bytes, sig.ECDSASigR.bitLength, err = readMPI(r)
if err == nil {
@ -195,16 +241,21 @@ type signatureSubpacketType uint8
const (
creationTimeSubpacket signatureSubpacketType = 2
signatureExpirationSubpacket signatureSubpacketType = 3
regularExpressionSubpacket signatureSubpacketType = 6
keyExpirationSubpacket signatureSubpacketType = 9
prefSymmetricAlgosSubpacket signatureSubpacketType = 11
revocationKey signatureSubpacketType = 12
issuerSubpacket signatureSubpacketType = 16
prefHashAlgosSubpacket signatureSubpacketType = 21
prefCompressionSubpacket signatureSubpacketType = 22
prefKeyServerSubpacket signatureSubpacketType = 24
primaryUserIdSubpacket signatureSubpacketType = 25
policyURISubpacket signatureSubpacketType = 26
keyFlagsSubpacket signatureSubpacketType = 27
reasonForRevocationSubpacket signatureSubpacketType = 29
featuresSubpacket signatureSubpacketType = 30
embeddedSignatureSubpacket signatureSubpacketType = 32
issuerFingerprint signatureSubpacketType = 33
)
// parseSignatureSubpacket parses a single subpacket. len(subpacket) is >= 1.
@ -382,6 +433,32 @@ func parseSignatureSubpacket(sig *Signature, subpacket []byte, isHashed bool) (r
if sigType := sig.EmbeddedSignature.SigType; sigType != SigTypePrimaryKeyBinding {
return nil, errors.StructuralError("cross-signature has unexpected type " + strconv.Itoa(int(sigType)))
}
case policyURISubpacket:
// See RFC 4880, Section 5.2.3.20
sig.PolicyURI = string(subpacket[:])
case regularExpressionSubpacket:
sig.Regex = string(subpacket[:])
if isCritical {
sig.StubbedOutCriticalError = errors.UnsupportedError("regex support is stubbed out")
}
case prefKeyServerSubpacket:
sig.PreferredKeyServer = string(subpacket[:])
case issuerFingerprint:
// The first byte is how many bytes the fingerprint is, but we'll just
// read until the end of the subpacket, so we'll ignore it.
sig.IssuerFingerprint = append([]byte{}, subpacket[1:]...)
case revocationKey:
// Authorizes the specified key to issue revocation signatures
// for a key.
// TODO: Class octet must have bit 0x80 set. If the bit 0x40
// is set, then this means that the revocation information is
// sensitive.
sig.DesignatedRevoker = &RevocationKey{
Class: subpacket[0],
PublicKeyAlgo: PublicKeyAlgorithm(subpacket[1]),
Fingerprint: append([]byte{}, subpacket[2:]...),
}
default:
if isCritical {
err = errors.UnsupportedError("unknown critical signature subpacket type " + strconv.Itoa(int(packetType)))
@ -464,6 +541,26 @@ func (sig *Signature) KeyExpired(currentTime time.Time) bool {
return currentTime.After(expiry)
}
// ExpiresBeforeOther checks if other signature has expiration at
// later date than sig.
func (sig *Signature) ExpiresBeforeOther(other *Signature) bool {
if sig.KeyLifetimeSecs == nil {
// This sig never expires, or has infinitely long expiration
// time.
return false
} else if other.KeyLifetimeSecs == nil {
// This sig expires at some non-infinite point, but the other
// sig never expires.
return true
}
getExpiryDate := func(s *Signature) time.Time {
return s.CreationTime.Add(time.Duration(*s.KeyLifetimeSecs) * time.Second)
}
return getExpiryDate(other).After(getExpiryDate(sig))
}
// buildHashSuffix constructs the HashSuffix member of sig in preparation for signing.
func (sig *Signature) buildHashSuffix() (err error) {
hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true)
@ -509,16 +606,27 @@ func (sig *Signature) signPrepareHash(h hash.Hash) (digest []byte, err error) {
// On success, the signature is stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err error) {
signer, hashIsSigner := h.(Signer)
if !hashIsSigner && (priv == nil || priv.PrivateKey == nil) {
err = errors.InvalidArgumentError("attempting to sign with nil PrivateKey")
return
}
sig.outSubpackets = sig.buildSubpackets()
digest, err := sig.signPrepareHash(h)
if err != nil {
return
}
if hashIsSigner {
err = signer.Sign(sig)
return
}
switch priv.PubKeyAlgo {
case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
// supports both *rsa.PrivateKey and crypto.Signer
sig.RSASignature.bytes, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash)
sig.RSASignature.bytes, err = rsa.SignPKCS1v15(config.Random(), priv.PrivateKey.(*rsa.PrivateKey), sig.Hash, digest)
sig.RSASignature.bitLength = uint16(8 * len(sig.RSASignature.bytes))
case PubKeyAlgoDSA:
dsaPriv := priv.PrivateKey.(*dsa.PrivateKey)
@ -536,20 +644,16 @@ func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err e
sig.DSASigS.bitLength = uint16(8 * len(sig.DSASigS.bytes))
}
case PubKeyAlgoECDSA:
var r, s *big.Int
if pk, ok := priv.PrivateKey.(*ecdsa.PrivateKey); ok {
// direct support, avoid asn1 wrapping/unwrapping
r, s, err = ecdsa.Sign(config.Random(), pk, digest)
} else {
var b []byte
b, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, nil)
if err == nil {
r, s, err = unwrapECDSASig(b)
}
}
r, s, err := ecdsa.Sign(config.Random(), priv.PrivateKey.(*ecdsa.PrivateKey), digest)
if err == nil {
sig.ECDSASigR = fromBig(r)
sig.ECDSASigS = fromBig(s)
sig.ECDSASigR = FromBig(r)
sig.ECDSASigS = FromBig(s)
}
case PubKeyAlgoEdDSA:
r, s, err := priv.PrivateKey.(*EdDSAPrivateKey).Sign(digest)
if err == nil {
sig.EdDSASigR = FromBytes(r)
sig.EdDSASigS = FromBytes(s)
}
default:
err = errors.UnsupportedError("public key algorithm: " + strconv.Itoa(int(sig.PubKeyAlgo)))
@ -558,19 +662,6 @@ func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err e
return
}
// unwrapECDSASig parses the two integer components of an ASN.1-encoded ECDSA
// signature.
func unwrapECDSASig(b []byte) (r, s *big.Int, err error) {
var ecsdaSig struct {
R, S *big.Int
}
_, err = asn1.Unmarshal(b, &ecsdaSig)
if err != nil {
return
}
return ecsdaSig.R, ecsdaSig.S, nil
}
// SignUserId computes a signature from priv, asserting that pub is a valid
// key for the identity id. On success, the signature is stored in sig. Call
// Serialize to write it out.
@ -583,6 +674,16 @@ func (sig *Signature) SignUserId(id string, pub *PublicKey, priv *PrivateKey, co
return sig.Sign(h, priv, config)
}
// SignUserIdWithSigner computes a signature from priv, asserting that pub is a
// valid key for the identity id. On success, the signature is stored in sig.
// Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
func (sig *Signature) SignUserIdWithSigner(id string, pub *PublicKey, s Signer, config *Config) error {
updateUserIdSignatureHash(id, pub, s)
return sig.Sign(s, nil, config)
}
// SignKey computes a signature from priv, asserting that pub is a subkey. On
// success, the signature is stored in sig. Call Serialize to write it out.
// If config is nil, sensible defaults will be used.
@ -594,13 +695,25 @@ func (sig *Signature) SignKey(pub *PublicKey, priv *PrivateKey, config *Config)
return sig.Sign(h, priv, config)
}
// SignKeyWithSigner computes a signature using s, asserting that
// signeePubKey is a subkey. On success, the signature is stored in sig. Call
// Serialize to write it out. If config is nil, sensible defaults will be used.
func (sig *Signature) SignKeyWithSigner(signeePubKey *PublicKey, signerPubKey *PublicKey, s Signer, config *Config) error {
updateKeySignatureHash(signerPubKey, signeePubKey, s)
return sig.Sign(s, nil, config)
}
// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
// called first.
func (sig *Signature) Serialize(w io.Writer) (err error) {
if len(sig.outSubpackets) == 0 {
sig.outSubpackets = sig.rawSubpackets
}
if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil && sig.ECDSASigR.bytes == nil {
if sig.RSASignature.bytes == nil &&
sig.DSASigR.bytes == nil &&
sig.ECDSASigR.bytes == nil &&
sig.EdDSASigR.bytes == nil {
return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
}
@ -611,6 +724,9 @@ func (sig *Signature) Serialize(w io.Writer) (err error) {
case PubKeyAlgoDSA:
sigLength = 2 + len(sig.DSASigR.bytes)
sigLength += 2 + len(sig.DSASigS.bytes)
case PubKeyAlgoEdDSA:
sigLength = 2 + len(sig.EdDSASigR.bytes)
sigLength += 2 + len(sig.EdDSASigS.bytes)
case PubKeyAlgoECDSA:
sigLength = 2 + len(sig.ECDSASigR.bytes)
sigLength += 2 + len(sig.ECDSASigS.bytes)
@ -651,6 +767,8 @@ func (sig *Signature) Serialize(w io.Writer) (err error) {
err = writeMPIs(w, sig.RSASignature)
case PubKeyAlgoDSA:
err = writeMPIs(w, sig.DSASigR, sig.DSASigS)
case PubKeyAlgoEdDSA:
err = writeMPIs(w, sig.EdDSASigR, sig.EdDSASigS)
case PubKeyAlgoECDSA:
err = writeMPIs(w, sig.ECDSASigR, sig.ECDSASigS)
default:
@ -687,20 +805,7 @@ func (sig *Signature) buildSubpackets() (subpackets []outputSubpacket) {
// Key flags may only appear in self-signatures or certification signatures.
if sig.FlagsValid {
var flags byte
if sig.FlagCertify {
flags |= KeyFlagCertify
}
if sig.FlagSign {
flags |= KeyFlagSign
}
if sig.FlagEncryptCommunications {
flags |= KeyFlagEncryptCommunications
}
if sig.FlagEncryptStorage {
flags |= KeyFlagEncryptStorage
}
subpackets = append(subpackets, outputSubpacket{true, keyFlagsSubpacket, false, []byte{flags}})
subpackets = append(subpackets, outputSubpacket{true, keyFlagsSubpacket, false, []byte{sig.GetKeyFlags().BitField}})
}
// The following subpackets may only appear in self-signatures
@ -729,3 +834,47 @@ func (sig *Signature) buildSubpackets() (subpackets []outputSubpacket) {
return
}
func (sig *Signature) GetKeyFlags() (ret KeyFlagBits) {
if !sig.FlagsValid {
return ret
}
ret.Valid = true
if sig.FlagCertify {
ret.BitField |= KeyFlagCertify
}
if sig.FlagSign {
ret.BitField |= KeyFlagSign
}
if sig.FlagEncryptCommunications {
ret.BitField |= KeyFlagEncryptCommunications
}
if sig.FlagEncryptStorage {
ret.BitField |= KeyFlagEncryptStorage
}
return ret
}
func (f *KeyFlagBits) HasFlagCertify() bool {
return f.BitField&KeyFlagCertify != 0
}
func (f *KeyFlagBits) HasFlagSign() bool {
return f.BitField&KeyFlagSign != 0
}
func (f *KeyFlagBits) HasFlagEncryptCommunications() bool {
return f.BitField&KeyFlagEncryptCommunications != 0
}
func (f *KeyFlagBits) HasFlagEncryptStorage() bool {
return f.BitField&KeyFlagEncryptStorage != 0
}
func (f *KeyFlagBits) Merge(other KeyFlagBits) {
if other.Valid {
f.Valid = true
f.BitField |= other.BitField
}
}

4
vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go → vendor/github.com/keybase/go-crypto/openpgp/packet/signature_v3.go generated vendored
View file

@ -12,8 +12,8 @@ import (
"strconv"
"time"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/s2k"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
)
// SignatureV3 represents older version 3 signatures. These signatures are less secure

7
vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go → vendor/github.com/keybase/go-crypto/openpgp/packet/symmetric_key_encrypted.go generated vendored
View file

@ -10,8 +10,8 @@ import (
"io"
"strconv"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/s2k"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/s2k"
)
// This is the largest session key that we'll support. Since no 512-bit cipher
@ -48,6 +48,9 @@ func (ske *SymmetricKeyEncrypted) parse(r io.Reader) error {
if err != nil {
return err
}
if ske.s2k == nil {
return errors.UnsupportedError("can't use dummy S2K for symmetric key encryption")
}
encryptedKey := make([]byte, maxSessionKeySizeInBytes)
// The session key may follow. We just have to try and read to find

3
vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go → vendor/github.com/keybase/go-crypto/openpgp/packet/symmetrically_encrypted.go generated vendored
View file

@ -8,10 +8,11 @@ import (
"crypto/cipher"
"crypto/sha1"
"crypto/subtle"
"golang.org/x/crypto/openpgp/errors"
"hash"
"io"
"strconv"
"github.com/keybase/go-crypto/openpgp/errors"
)
// SymmetricallyEncrypted represents a symmetrically encrypted byte string. The

0
vendor/golang.org/x/crypto/openpgp/packet/userattribute.go → vendor/github.com/keybase/go-crypto/openpgp/packet/userattribute.go generated vendored
View file

0
vendor/golang.org/x/crypto/openpgp/packet/userid.go → vendor/github.com/keybase/go-crypto/openpgp/packet/userid.go generated vendored
View file

7
vendor/github.com/keybase/go-crypto/openpgp/patch.sh generated vendored Normal file
View file

@ -0,0 +1,7 @@
#!/bin/sh
patch < sig-v3.patch
patch < s2k-gnu-dummy.patch
find . -type f -name '*.go' -exec sed -i'' -e 's/golang.org\/x\/crypto\/openpgp/github.com\/keybase\/go-crypto\/openpgp/' {} \;
find . -type f -name '*.go-e' -exec rm {} \;
go test ./...

61
vendor/golang.org/x/crypto/openpgp/read.go → vendor/github.com/keybase/go-crypto/openpgp/read.go generated vendored
View file

@ -3,18 +3,19 @@
// license that can be found in the LICENSE file.
// Package openpgp implements high level operations on OpenPGP messages.
package openpgp // import "golang.org/x/crypto/openpgp"
package openpgp // import "github.com/keybase/go-crypto/openpgp"
import (
"crypto"
"crypto/hmac"
_ "crypto/sha256"
"hash"
"io"
"strconv"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/packet"
"github.com/keybase/go-crypto/openpgp/armor"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/packet"
)
// SignatureType is the armor type for a PGP signature.
@ -50,7 +51,7 @@ type MessageDetails struct {
// If IsSigned is true and SignedBy is non-zero then the signature will
// be verified as UnverifiedBody is read. The signature cannot be
// checked until the whole of UnverifiedBody is read so UnverifiedBody
// must be consumed until EOF before the data can be trusted. Even if a
// must be consumed until EOF before the data can trusted. Even if a
// message isn't signed (or the signer is unknown) the data may contain
// an authentication code that is only checked once UnverifiedBody has
// been consumed. Once EOF has been seen, the following fields are
@ -113,7 +114,7 @@ ParsePackets:
// This packet contains the decryption key encrypted to a public key.
md.EncryptedToKeyIds = append(md.EncryptedToKeyIds, p.KeyId)
switch p.Algo {
case packet.PubKeyAlgoRSA, packet.PubKeyAlgoRSAEncryptOnly, packet.PubKeyAlgoElGamal:
case packet.PubKeyAlgoRSA, packet.PubKeyAlgoRSAEncryptOnly, packet.PubKeyAlgoElGamal, packet.PubKeyAlgoECDH:
break
default:
continue
@ -122,7 +123,7 @@ ParsePackets:
if p.KeyId == 0 {
keys = keyring.DecryptionKeys()
} else {
keys = keyring.KeysById(p.KeyId)
keys = keyring.KeysById(p.KeyId, nil)
}
for _, k := range keys {
pubKeys = append(pubKeys, keyEnvelopePair{k, p})
@ -255,7 +256,7 @@ FindLiteralData:
md.IsSigned = true
md.SignedByKeyId = p.KeyId
keys := keyring.KeysByIdUsage(p.KeyId, packet.KeyFlagSign)
keys := keyring.KeysByIdUsage(p.KeyId, nil, packet.KeyFlagSign)
if len(keys) > 0 {
md.SignedBy = &keys[0]
}
@ -336,7 +337,16 @@ func (scr *signatureCheckReader) Read(buf []byte) (n int, err error) {
var ok bool
if scr.md.Signature, ok = p.(*packet.Signature); ok {
scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
var err error
if fingerprint := scr.md.Signature.IssuerFingerprint; fingerprint != nil {
if !hmac.Equal(fingerprint, scr.md.SignedBy.PublicKey.Fingerprint[:]) {
err = errors.StructuralError("bad key fingerprint")
}
}
if err == nil {
err = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
}
scr.md.SignatureError = err
} else if scr.md.SignatureV3, ok = p.(*packet.SignatureV3); ok {
scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignatureV3(scr.h, scr.md.SignatureV3)
} else {
@ -361,7 +371,13 @@ func (scr *signatureCheckReader) Read(buf []byte) (n int, err error) {
// returns the signer if the signature is valid. If the signer isn't known,
// ErrUnknownIssuer is returned.
func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
signer, _, err = checkDetachedSignature(keyring, signed, signature)
return signer, err
}
func checkDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, issuer *uint64, err error) {
var issuerKeyId uint64
var issuerFingerprint []byte
var hashFunc crypto.Hash
var sigType packet.SignatureType
var keys []Key
@ -371,29 +387,30 @@ func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signe
for {
p, err = packets.Next()
if err == io.EOF {
return nil, errors.ErrUnknownIssuer
return nil, nil, errors.ErrUnknownIssuer
}
if err != nil {
return nil, err
return nil, nil, err
}
switch sig := p.(type) {
case *packet.Signature:
if sig.IssuerKeyId == nil {
return nil, errors.StructuralError("signature doesn't have an issuer")
return nil, nil, errors.StructuralError("signature doesn't have an issuer")
}
issuerKeyId = *sig.IssuerKeyId
hashFunc = sig.Hash
sigType = sig.SigType
issuerFingerprint = sig.IssuerFingerprint
case *packet.SignatureV3:
issuerKeyId = sig.IssuerKeyId
hashFunc = sig.Hash
sigType = sig.SigType
default:
return nil, errors.StructuralError("non signature packet found")
return nil, nil, errors.StructuralError("non signature packet found")
}
keys = keyring.KeysByIdUsage(issuerKeyId, packet.KeyFlagSign)
keys = keyring.KeysByIdUsage(issuerKeyId, issuerFingerprint, packet.KeyFlagSign)
if len(keys) > 0 {
break
}
@ -405,11 +422,11 @@ func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signe
h, wrappedHash, err := hashForSignature(hashFunc, sigType)
if err != nil {
return nil, err
return nil, nil, err
}
if _, err := io.Copy(wrappedHash, signed); err != nil && err != io.EOF {
return nil, err
return nil, nil, err
}
for _, key := range keys {
@ -423,20 +440,24 @@ func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signe
}
if err == nil {
return key.Entity, nil
return key.Entity, &issuerKeyId, nil
}
}
return nil, err
return nil, nil, err
}
// CheckArmoredDetachedSignature performs the same actions as
// CheckDetachedSignature but expects the signature to be armored.
func CheckArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
signer, _, err = checkArmoredDetachedSignature(keyring, signed, signature)
return signer, err
}
func checkArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, issuer *uint64, err error) {
body, err := readArmored(signature, SignatureType)
if err != nil {
return
}
return CheckDetachedSignature(keyring, signed, body)
return checkDetachedSignature(keyring, signed, body)
}

59
vendor/golang.org/x/crypto/openpgp/s2k/s2k.go → vendor/github.com/keybase/go-crypto/openpgp/s2k/s2k.go generated vendored
View file

@ -4,7 +4,7 @@
// Package s2k implements the various OpenPGP string-to-key transforms as
// specified in RFC 4800 section 3.7.1.
package s2k // import "golang.org/x/crypto/openpgp/s2k"
package s2k // import "github.com/keybase/go-crypto/openpgp/s2k"
import (
"crypto"
@ -12,7 +12,7 @@ import (
"io"
"strconv"
"golang.org/x/crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/errors"
)
// Config collects configuration parameters for s2k key-stretching
@ -151,6 +151,53 @@ func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
}
}
func parseGNUExtensions(r io.Reader) (f func(out, in []byte), err error) {
var buf [9]byte
// A three-byte string identifier
_, err = io.ReadFull(r, buf[:3])
if err != nil {
return
}
gnuExt := string(buf[:3])
if gnuExt != "GNU" {
return nil, errors.UnsupportedError("Malformed GNU extension: " + gnuExt)
}
_, err = io.ReadFull(r, buf[:1])
if err != nil {
return
}
gnuExtType := int(buf[0])
switch gnuExtType {
case 1:
return nil, nil
case 2:
// Read a serial number, which is prefixed by a 1-byte length.
// The maximum length is 16.
var lenBuf [1]byte
_, err = io.ReadFull(r, lenBuf[:])
if err != nil {
return
}
maxLen := 16
ivLen := int(lenBuf[0])
if ivLen > maxLen {
ivLen = maxLen
}
ivBuf := make([]byte, ivLen)
// For now we simply discard the IV
_, err = io.ReadFull(r, ivBuf)
if err != nil {
return
}
return nil, nil
default:
return nil, errors.UnsupportedError("unknown S2K GNU protection mode: " + strconv.Itoa(int(gnuExtType)))
}
}
// Parse reads a binary specification for a string-to-key transformation from r
// and returns a function which performs that transform.
func Parse(r io.Reader) (f func(out, in []byte), err error) {
@ -161,6 +208,12 @@ func Parse(r io.Reader) (f func(out, in []byte), err error) {
return
}
// GNU Extensions; handle them before we try to look for a hash, which won't
// be needed in most cases anyway.
if buf[0] == 101 {
return parseGNUExtensions(r)
}
hash, ok := HashIdToHash(buf[1])
if !ok {
return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
@ -251,7 +304,7 @@ func HashIdToHash(id byte) (h crypto.Hash, ok bool) {
}
// HashIdToString returns the name of the hash function corresponding to the
// given OpenPGP hash id.
// given OpenPGP hash id, or panics if id is unknown.
func HashIdToString(id byte) (name string, ok bool) {
for _, m := range hashToHashIdMapping {
if m.id == id {

135
vendor/github.com/keybase/go-crypto/openpgp/sig-v3.patch generated vendored Normal file
View file

@ -0,0 +1,135 @@
diff --git a/openpgp/read.go b/openpgp/read.go
index a6cecc5..0c9397b 100644
--- a/openpgp/read.go
+++ b/openpgp/read.go
@@ -56,8 +56,9 @@ type MessageDetails struct {
// been consumed. Once EOF has been seen, the following fields are
// valid. (An authentication code failure is reported as a
// SignatureError error when reading from UnverifiedBody.)
- SignatureError error // nil if the signature is good.
- Signature *packet.Signature // the signature packet itself.
+ SignatureError error // nil if the signature is good.
+ Signature *packet.Signature // the signature packet itself, if v4 (default)
+ SignatureV3 *packet.SignatureV3 // the signature packet if it is a v2 or v3 signature
decrypted io.ReadCloser
}
@@ -334,13 +335,15 @@ func (scr *signatureCheckReader) Read(buf []byte) (n int, err error) {
}
var ok bool
- if scr.md.Signature, ok = p.(*packet.Signature); !ok {
+ if scr.md.Signature, ok = p.(*packet.Signature); ok {
+ scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
+ } else if scr.md.SignatureV3, ok = p.(*packet.SignatureV3); ok {
+ scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignatureV3(scr.h, scr.md.SignatureV3)
+ } else {
scr.md.SignatureError = errors.StructuralError("LiteralData not followed by Signature")
return
}
- scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
-
// The SymmetricallyEncrypted packet, if any, might have an
// unsigned hash of its own. In order to check this we need to
// close that Reader.
diff --git a/openpgp/read_test.go b/openpgp/read_test.go
index 52f942c..abe8d7b 100644
--- a/openpgp/read_test.go
+++ b/openpgp/read_test.go
@@ -13,6 +13,7 @@ import (
"strings"
"testing"
+ "golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/errors"
)
@@ -411,6 +412,50 @@ func TestIssue11504(t *testing.T) {
testReadMessageError(t, "9303000130303030303030303030983002303030303030030000000130")
}
+// TestSignatureV3Message tests the verification of V3 signature, generated
+// with a modern V4-style key. Some people have their clients set to generate
+// V3 signatures, so it's useful to be able to verify them.
+func TestSignatureV3Message(t *testing.T) {
+ sig, err := armor.Decode(strings.NewReader(signedMessageV3))
+ if err != nil {
+ t.Error(err)
+ return
+ }
+ key, err := ReadArmoredKeyRing(strings.NewReader(keyV4forVerifyingSignedMessageV3))
+ if err != nil {
+ t.Error(err)
+ return
+ }
+ md, err := ReadMessage(sig.Body, key, nil, nil)
+ if err != nil {
+ t.Error(err)
+ return
+ }
+
+ _, err = ioutil.ReadAll(md.UnverifiedBody)
+ if err != nil {
+ t.Error(err)
+ return
+ }
+
+ // We'll see a sig error here after reading in the UnverifiedBody above,
+ // if there was one to see.
+ if err = md.SignatureError; err != nil {
+ t.Error(err)
+ return
+ }
+
+ if md.SignatureV3 == nil {
+ t.Errorf("No available signature after checking signature")
+ return
+ }
+ if md.Signature != nil {
+ t.Errorf("Did not expect a signature V4 back")
+ return
+ }
+ return
+}
+
const testKey1KeyId = 0xA34D7E18C20C31BB
const testKey3KeyId = 0x338934250CCC0360
@@ -504,3 +549,36 @@ const unknownHashFunctionHex = `8a00000040040001990006050253863c24000a09103b4fe6
const missingHashFunctionHex = `8a00000040040001030006050253863c24000a09103b4fe6acc0b21f32ffff0101010101010101010101010101010101010101010101010101010101010101010101010101`
const campbellQuine = `a0b001000300fcffa0b001000d00f2ff000300fcffa0b001000d00f2ff8270a01c00000500faff8270a01c00000500faff000500faff001400ebff8270a01c00000500faff000500faff001400ebff428821c400001400ebff428821c400001400ebff428821c400001400ebff428821c400001400ebff428821c400000000ffff000000ffff000b00f4ff428821c400000000ffff000000ffff000b00f4ff0233214c40000100feff000233214c40000100feff0000`
+
+const keyV4forVerifyingSignedMessageV3 = `-----BEGIN PGP PUBLIC KEY BLOCK-----
+Comment: GPGTools - https://gpgtools.org
+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RZia
+-----END PGP PUBLIC KEY BLOCK-----
+`
+
+const signedMessageV3 = `-----BEGIN PGP MESSAGE-----
+Comment: GPGTools - https://gpgtools.org
+
+owGbwMvMwMVYWXlhlrhb9GXG03JJDKF/MtxDMjKLFYAoUaEktbhEITe1uDgxPVWP
+q5NhKjMrWAVcC9evD8z/bF/uWNjqtk/X3y5/38XGRQHm/57rrDRYuGnTw597Xqka
+uM3137/hH3Os+Jf2dc0fXOITKwJvXJvecPVs0ta+Vg7ZO1MLn8w58Xx+6L58mbka
+DGHyU9yTueZE8D+QF/Tz28Y78dqtF56R1VPn9Xw4uJqrWYdd7b3vIZ1V6R4Nh05d
+iT57d/OhWwA=
+=hG7R
+-----END PGP MESSAGE-----
+`

151
vendor/golang.org/x/crypto/openpgp/write.go → vendor/github.com/keybase/go-crypto/openpgp/write.go generated vendored
View file

@ -11,10 +11,10 @@ import (
"strconv"
"time"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/packet"
"golang.org/x/crypto/openpgp/s2k"
"github.com/keybase/go-crypto/openpgp/armor"
"github.com/keybase/go-crypto/openpgp/errors"
"github.com/keybase/go-crypto/openpgp/packet"
"github.com/keybase/go-crypto/openpgp/s2k"
)
// DetachSign signs message with the private key from signer (which must
@ -59,20 +59,57 @@ func armoredDetachSign(w io.Writer, signer *Entity, message io.Reader, sigType p
return out.Close()
}
// SignWithSigner signs the message of type sigType with s and writes the
// signature to w.
// If config is nil, sensible defaults will be used.
func SignWithSigner(s packet.Signer, w io.Writer, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
keyId := s.KeyId()
sig := new(packet.Signature)
sig.SigType = sigType
sig.PubKeyAlgo = s.PublicKeyAlgo()
sig.Hash = config.Hash()
sig.CreationTime = config.Now()
sig.IssuerKeyId = &keyId
s.Reset()
wrapped := s.(hash.Hash)
if sigType == packet.SigTypeText {
wrapped = NewCanonicalTextHash(s)
}
io.Copy(wrapped, message)
err = sig.Sign(s, nil, config)
if err != nil {
return
}
err = sig.Serialize(w)
return
}
func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
if signer.PrivateKey == nil {
signerSubkey, ok := signer.signingKey(config.Now())
if !ok {
err = errors.InvalidArgumentError("no valid signing keys")
return
}
if signerSubkey.PrivateKey == nil {
return errors.InvalidArgumentError("signing key doesn't have a private key")
}
if signer.PrivateKey.Encrypted {
if signerSubkey.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing key is encrypted")
}
sig := new(packet.Signature)
sig.SigType = sigType
sig.PubKeyAlgo = signer.PrivateKey.PubKeyAlgo
sig.PubKeyAlgo = signerSubkey.PrivateKey.PubKeyAlgo
sig.Hash = config.Hash()
sig.CreationTime = config.Now()
sig.IssuerKeyId = &signer.PrivateKey.KeyId
sig.IssuerKeyId = &signerSubkey.PrivateKey.KeyId
h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
if err != nil {
@ -80,7 +117,7 @@ func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.S
}
io.Copy(wrappedHash, message)
err = sig.Sign(h, signer.PrivateKey, config)
err = sig.Sign(h, signerSubkey.PrivateKey, config)
if err != nil {
return
}
@ -198,11 +235,20 @@ func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHint
hashToHashId(crypto.SHA1),
hashToHashId(crypto.RIPEMD160),
}
// In the event that a recipient doesn't specify any supported ciphers
// or hash functions, these are the ones that we assume that every
// implementation supports.
defaultCiphers := candidateCiphers[len(candidateCiphers)-1:]
defaultHashes := candidateHashes[len(candidateHashes)-1:]
// If no preferences were specified, assume something safe and reasonable.
defaultCiphers := []uint8{
uint8(packet.CipherAES128),
uint8(packet.CipherAES192),
uint8(packet.CipherAES256),
uint8(packet.CipherCAST5),
}
defaultHashes := []uint8{
hashToHashId(crypto.SHA256),
hashToHashId(crypto.SHA512),
hashToHashId(crypto.RIPEMD160),
}
encryptKeys := make([]Key, len(to))
for i := range to {
@ -226,12 +272,15 @@ func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHint
candidateHashes = intersectPreferences(candidateHashes, preferredHashes)
}
if len(candidateCiphers) == 0 || len(candidateHashes) == 0 {
return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common algorithms")
if len(candidateCiphers) == 0 {
return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common ciphers")
}
if len(candidateHashes) == 0 {
return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common hashes")
}
cipher := packet.CipherFunction(candidateCiphers[0])
// If the cipher specified by config is a candidate, we'll use that.
// If the cipher specifed by config is a candidate, we'll use that.
configuredCipher := config.Cipher()
for _, c := range candidateCiphers {
cipherFunc := packet.CipherFunction(c)
@ -376,3 +425,71 @@ func (c noOpCloser) Write(data []byte) (n int, err error) {
func (c noOpCloser) Close() error {
return nil
}
// AttachedSign is like openpgp.Encrypt (as in p.crypto/openpgp/write.go), but
// don't encrypt at all, just sign the literal unencrypted data.
// Unfortunately we need to duplicate some code here that's already
// in write.go
func AttachedSign(out io.WriteCloser, signed Entity, hints *FileHints,
config *packet.Config) (in io.WriteCloser, err error) {
if hints == nil {
hints = &FileHints{}
}
if config == nil {
config = &packet.Config{}
}
var signer *packet.PrivateKey
signKey, ok := signed.signingKey(config.Now())
if !ok {
err = errors.InvalidArgumentError("no valid signing keys")
return
}
signer = signKey.PrivateKey
if signer == nil {
err = errors.InvalidArgumentError("no valid signing keys")
return
}
if signer.Encrypted {
err = errors.InvalidArgumentError("signing key must be decrypted")
return
}
hasher := crypto.SHA512
ops := &packet.OnePassSignature{
SigType: packet.SigTypeBinary,
Hash: hasher,
PubKeyAlgo: signer.PubKeyAlgo,
KeyId: signer.KeyId,
IsLast: true,
}
if err = ops.Serialize(out); err != nil {
return
}
var epochSeconds uint32
if !hints.ModTime.IsZero() {
epochSeconds = uint32(hints.ModTime.Unix())
}
// We don't want the literal serializer to closer the output stream
// since we're going to need to write to it when we finish up the
// signature stuff.
in, err = packet.SerializeLiteral(noOpCloser{out}, hints.IsBinary, hints.FileName, epochSeconds)
if err != nil {
return
}
// If we need to write a signature packet after the literal
// data then we need to stop literalData from closing
// encryptedData.
in = signatureWriter{out, in, hasher, hasher.New(), signer, config}
return
}

325
vendor/github.com/keybase/go-crypto/rsa/pkcs1v15.go generated vendored Normal file
View file

@ -0,0 +1,325 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rsa
import (
"crypto"
"crypto/subtle"
"errors"
"io"
"math/big"
)
// This file implements encryption and decryption using PKCS#1 v1.5 padding.
// PKCS1v15DecrypterOpts is for passing options to PKCS#1 v1.5 decryption using
// the crypto.Decrypter interface.
type PKCS1v15DecryptOptions struct {
// SessionKeyLen is the length of the session key that is being
// decrypted. If not zero, then a padding error during decryption will
// cause a random plaintext of this length to be returned rather than
// an error. These alternatives happen in constant time.
SessionKeyLen int
}
// EncryptPKCS1v15 encrypts the given message with RSA and the padding scheme from PKCS#1 v1.5.
// The message must be no longer than the length of the public modulus minus 11 bytes.
//
// The rand parameter is used as a source of entropy to ensure that encrypting
// the same message twice doesn't result in the same ciphertext.
//
// WARNING: use of this function to encrypt plaintexts other than session keys
// is dangerous. Use RSA OAEP in new protocols.
func EncryptPKCS1v15(rand io.Reader, pub *PublicKey, msg []byte) (out []byte, err error) {
if err := checkPub(pub); err != nil {
return nil, err
}
k := (pub.N.BitLen() + 7) / 8
if len(msg) > k-11 {
err = ErrMessageTooLong
return
}
// EM = 0x00 || 0x02 || PS || 0x00 || M
em := make([]byte, k)
em[1] = 2
ps, mm := em[2:len(em)-len(msg)-1], em[len(em)-len(msg):]
err = nonZeroRandomBytes(ps, rand)
if err != nil {
return
}
em[len(em)-len(msg)-1] = 0
copy(mm, msg)
m := new(big.Int).SetBytes(em)
c := encrypt(new(big.Int), pub, m)
copyWithLeftPad(em, c.Bytes())
out = em
return
}
// DecryptPKCS1v15 decrypts a plaintext using RSA and the padding scheme from PKCS#1 v1.5.
// If rand != nil, it uses RSA blinding to avoid timing side-channel attacks.
//
// Note that whether this function returns an error or not discloses secret
// information. If an attacker can cause this function to run repeatedly and
// learn whether each instance returned an error then they can decrypt and
// forge signatures as if they had the private key. See
// DecryptPKCS1v15SessionKey for a way of solving this problem.
func DecryptPKCS1v15(rand io.Reader, priv *PrivateKey, ciphertext []byte) (out []byte, err error) {
if err := checkPub(&priv.PublicKey); err != nil {
return nil, err
}
valid, out, index, err := decryptPKCS1v15(rand, priv, ciphertext)
if err != nil {
return
}
if valid == 0 {
return nil, ErrDecryption
}
out = out[index:]
return
}
// DecryptPKCS1v15SessionKey decrypts a session key using RSA and the padding scheme from PKCS#1 v1.5.
// If rand != nil, it uses RSA blinding to avoid timing side-channel attacks.
// It returns an error if the ciphertext is the wrong length or if the
// ciphertext is greater than the public modulus. Otherwise, no error is
// returned. If the padding is valid, the resulting plaintext message is copied
// into key. Otherwise, key is unchanged. These alternatives occur in constant
// time. It is intended that the user of this function generate a random
// session key beforehand and continue the protocol with the resulting value.
// This will remove any possibility that an attacker can learn any information
// about the plaintext.
// See ``Chosen Ciphertext Attacks Against Protocols Based on the RSA
// Encryption Standard PKCS #1'', Daniel Bleichenbacher, Advances in Cryptology
// (Crypto '98).
//
// Note that if the session key is too small then it may be possible for an
// attacker to brute-force it. If they can do that then they can learn whether
// a random value was used (because it'll be different for the same ciphertext)
// and thus whether the padding was correct. This defeats the point of this
// function. Using at least a 16-byte key will protect against this attack.
func DecryptPKCS1v15SessionKey(rand io.Reader, priv *PrivateKey, ciphertext []byte, key []byte) (err error) {
if err := checkPub(&priv.PublicKey); err != nil {
return err
}
k := (priv.N.BitLen() + 7) / 8
if k-(len(key)+3+8) < 0 {
return ErrDecryption
}
valid, em, index, err := decryptPKCS1v15(rand, priv, ciphertext)
if err != nil {
return
}
if len(em) != k {
// This should be impossible because decryptPKCS1v15 always
// returns the full slice.
return ErrDecryption
}
valid &= subtle.ConstantTimeEq(int32(len(em)-index), int32(len(key)))
subtle.ConstantTimeCopy(valid, key, em[len(em)-len(key):])
return
}
// decryptPKCS1v15 decrypts ciphertext using priv and blinds the operation if
// rand is not nil. It returns one or zero in valid that indicates whether the
// plaintext was correctly structured. In either case, the plaintext is
// returned in em so that it may be read independently of whether it was valid
// in order to maintain constant memory access patterns. If the plaintext was
// valid then index contains the index of the original message in em.
func decryptPKCS1v15(rand io.Reader, priv *PrivateKey, ciphertext []byte) (valid int, em []byte, index int, err error) {
k := (priv.N.BitLen() + 7) / 8
if k < 11 {
err = ErrDecryption
return
}
c := new(big.Int).SetBytes(ciphertext)
m, err := decrypt(rand, priv, c)
if err != nil {
return
}
em = leftPad(m.Bytes(), k)
firstByteIsZero := subtle.ConstantTimeByteEq(em[0], 0)
secondByteIsTwo := subtle.ConstantTimeByteEq(em[1], 2)
// The remainder of the plaintext must be a string of non-zero random
// octets, followed by a 0, followed by the message.
// lookingForIndex: 1 iff we are still looking for the zero.
// index: the offset of the first zero byte.
lookingForIndex := 1
for i := 2; i < len(em); i++ {
equals0 := subtle.ConstantTimeByteEq(em[i], 0)
index = subtle.ConstantTimeSelect(lookingForIndex&equals0, i, index)
lookingForIndex = subtle.ConstantTimeSelect(equals0, 0, lookingForIndex)
}
// The PS padding must be at least 8 bytes long, and it starts two
// bytes into em.
validPS := subtle.ConstantTimeLessOrEq(2+8, index)
valid = firstByteIsZero & secondByteIsTwo & (^lookingForIndex & 1) & validPS
index = subtle.ConstantTimeSelect(valid, index+1, 0)
return valid, em, index, nil
}
// nonZeroRandomBytes fills the given slice with non-zero random octets.
func nonZeroRandomBytes(s []byte, rand io.Reader) (err error) {
_, err = io.ReadFull(rand, s)
if err != nil {
return
}
for i := 0; i < len(s); i++ {
for s[i] == 0 {
_, err = io.ReadFull(rand, s[i:i+1])
if err != nil {
return
}
// In tests, the PRNG may return all zeros so we do
// this to break the loop.
s[i] ^= 0x42
}
}
return
}
// These are ASN1 DER structures:
// DigestInfo ::= SEQUENCE {
// digestAlgorithm AlgorithmIdentifier,
// digest OCTET STRING
// }
// For performance, we don't use the generic ASN1 encoder. Rather, we
// precompute a prefix of the digest value that makes a valid ASN1 DER string
// with the correct contents.
var hashPrefixes = map[crypto.Hash][]byte{
crypto.MD5: {0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86, 0x48, 0x86, 0xf7, 0x0d, 0x02, 0x05, 0x05, 0x00, 0x04, 0x10},
crypto.SHA1: {0x30, 0x21, 0x30, 0x09, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x05, 0x00, 0x04, 0x14},
crypto.SHA224: {0x30, 0x2d, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x04, 0x05, 0x00, 0x04, 0x1c},
crypto.SHA256: {0x30, 0x31, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x01, 0x05, 0x00, 0x04, 0x20},
crypto.SHA384: {0x30, 0x41, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x02, 0x05, 0x00, 0x04, 0x30},
crypto.SHA512: {0x30, 0x51, 0x30, 0x0d, 0x06, 0x09, 0x60, 0x86, 0x48, 0x01, 0x65, 0x03, 0x04, 0x02, 0x03, 0x05, 0x00, 0x04, 0x40},
crypto.MD5SHA1: {}, // A special TLS case which doesn't use an ASN1 prefix.
crypto.RIPEMD160: {0x30, 0x20, 0x30, 0x08, 0x06, 0x06, 0x28, 0xcf, 0x06, 0x03, 0x00, 0x31, 0x04, 0x14},
}
// SignPKCS1v15 calculates the signature of hashed using RSASSA-PKCS1-V1_5-SIGN from RSA PKCS#1 v1.5.
// Note that hashed must be the result of hashing the input message using the
// given hash function. If hash is zero, hashed is signed directly. This isn't
// advisable except for interoperability.
//
// If rand is not nil then RSA blinding will be used to avoid timing side-channel attacks.
//
// This function is deterministic. Thus, if the set of possible messages is
// small, an attacker may be able to build a map from messages to signatures
// and identify the signed messages. As ever, signatures provide authenticity,
// not confidentiality.
func SignPKCS1v15(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed []byte) (s []byte, err error) {
hashLen, prefix, err := pkcs1v15HashInfo(hash, len(hashed))
if err != nil {
return
}
tLen := len(prefix) + hashLen
k := (priv.N.BitLen() + 7) / 8
if k < tLen+11 {
return nil, ErrMessageTooLong
}
// EM = 0x00 || 0x01 || PS || 0x00 || T
em := make([]byte, k)
em[1] = 1
for i := 2; i < k-tLen-1; i++ {
em[i] = 0xff
}
copy(em[k-tLen:k-hashLen], prefix)
copy(em[k-hashLen:k], hashed)
m := new(big.Int).SetBytes(em)
c, err := decryptAndCheck(rand, priv, m)
if err != nil {
return
}
copyWithLeftPad(em, c.Bytes())
s = em
return
}
// VerifyPKCS1v15 verifies an RSA PKCS#1 v1.5 signature.
// hashed is the result of hashing the input message using the given hash
// function and sig is the signature. A valid signature is indicated by
// returning a nil error. If hash is zero then hashed is used directly. This
// isn't advisable except for interoperability.
func VerifyPKCS1v15(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte) (err error) {
hashLen, prefix, err := pkcs1v15HashInfo(hash, len(hashed))
if err != nil {
return
}
tLen := len(prefix) + hashLen
k := (pub.N.BitLen() + 7) / 8
if k < tLen+11 {
err = ErrVerification
return
}
c := new(big.Int).SetBytes(sig)
m := encrypt(new(big.Int), pub, c)
em := leftPad(m.Bytes(), k)
// EM = 0x00 || 0x01 || PS || 0x00 || T
ok := subtle.ConstantTimeByteEq(em[0], 0)
ok &= subtle.ConstantTimeByteEq(em[1], 1)
ok &= subtle.ConstantTimeCompare(em[k-hashLen:k], hashed)
ok &= subtle.ConstantTimeCompare(em[k-tLen:k-hashLen], prefix)
ok &= subtle.ConstantTimeByteEq(em[k-tLen-1], 0)
for i := 2; i < k-tLen-1; i++ {
ok &= subtle.ConstantTimeByteEq(em[i], 0xff)
}
if ok != 1 {
return ErrVerification
}
return nil
}
func pkcs1v15HashInfo(hash crypto.Hash, inLen int) (hashLen int, prefix []byte, err error) {
// Special case: crypto.Hash(0) is used to indicate that the data is
// signed directly.
if hash == 0 {
return inLen, nil, nil
}
hashLen = hash.Size()
if inLen != hashLen {
return 0, nil, errors.New("crypto/rsa: input must be hashed message")
}
prefix, ok := hashPrefixes[hash]
if !ok {
return 0, nil, errors.New("crypto/rsa: unsupported hash function")
}
return
}
// copyWithLeftPad copies src to the end of dest, padding with zero bytes as
// needed.
func copyWithLeftPad(dest, src []byte) {
numPaddingBytes := len(dest) - len(src)
for i := 0; i < numPaddingBytes; i++ {
dest[i] = 0
}
copy(dest[numPaddingBytes:], src)
}

297
vendor/github.com/keybase/go-crypto/rsa/pss.go generated vendored Normal file
View file

@ -0,0 +1,297 @@
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package rsa
// This file implements the PSS signature scheme [1].
//
// [1] http://www.rsa.com/rsalabs/pkcs/files/h11300-wp-pkcs-1v2-2-rsa-cryptography-standard.pdf
import (
"bytes"
"crypto"
"errors"
"hash"
"io"
"math/big"
)
func emsaPSSEncode(mHash []byte, emBits int, salt []byte, hash hash.Hash) ([]byte, error) {
// See [1], section 9.1.1
hLen := hash.Size()
sLen := len(salt)
emLen := (emBits + 7) / 8
// 1. If the length of M is greater than the input limitation for the
// hash function (2^61 - 1 octets for SHA-1), output "message too
// long" and stop.
//
// 2. Let mHash = Hash(M), an octet string of length hLen.
if len(mHash) != hLen {
return nil, errors.New("crypto/rsa: input must be hashed message")
}
// 3. If emLen < hLen + sLen + 2, output "encoding error" and stop.
if emLen < hLen+sLen+2 {
return nil, errors.New("crypto/rsa: encoding error")
}
em := make([]byte, emLen)
db := em[:emLen-sLen-hLen-2+1+sLen]
h := em[emLen-sLen-hLen-2+1+sLen : emLen-1]
// 4. Generate a random octet string salt of length sLen; if sLen = 0,
// then salt is the empty string.
//
// 5. Let
// M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt;
//
// M' is an octet string of length 8 + hLen + sLen with eight
// initial zero octets.
//
// 6. Let H = Hash(M'), an octet string of length hLen.
var prefix [8]byte
hash.Write(prefix[:])
hash.Write(mHash)
hash.Write(salt)
h = hash.Sum(h[:0])
hash.Reset()
// 7. Generate an octet string PS consisting of emLen - sLen - hLen - 2
// zero octets. The length of PS may be 0.
//
// 8. Let DB = PS || 0x01 || salt; DB is an octet string of length
// emLen - hLen - 1.
db[emLen-sLen-hLen-2] = 0x01
copy(db[emLen-sLen-hLen-1:], salt)
// 9. Let dbMask = MGF(H, emLen - hLen - 1).
//
// 10. Let maskedDB = DB \xor dbMask.
mgf1XOR(db, hash, h)
// 11. Set the leftmost 8 * emLen - emBits bits of the leftmost octet in
// maskedDB to zero.
db[0] &= (0xFF >> uint(8*emLen-emBits))
// 12. Let EM = maskedDB || H || 0xbc.
em[emLen-1] = 0xBC
// 13. Output EM.
return em, nil
}
func emsaPSSVerify(mHash, em []byte, emBits, sLen int, hash hash.Hash) error {
// 1. If the length of M is greater than the input limitation for the
// hash function (2^61 - 1 octets for SHA-1), output "inconsistent"
// and stop.
//
// 2. Let mHash = Hash(M), an octet string of length hLen.
hLen := hash.Size()
if hLen != len(mHash) {
return ErrVerification
}
// 3. If emLen < hLen + sLen + 2, output "inconsistent" and stop.
emLen := (emBits + 7) / 8
if emLen < hLen+sLen+2 {
return ErrVerification
}
// 4. If the rightmost octet of EM does not have hexadecimal value
// 0xbc, output "inconsistent" and stop.
if em[len(em)-1] != 0xBC {
return ErrVerification
}
// 5. Let maskedDB be the leftmost emLen - hLen - 1 octets of EM, and
// let H be the next hLen octets.
db := em[:emLen-hLen-1]
h := em[emLen-hLen-1 : len(em)-1]
// 6. If the leftmost 8 * emLen - emBits bits of the leftmost octet in
// maskedDB are not all equal to zero, output "inconsistent" and
// stop.
if em[0]&(0xFF<<uint(8-(8*emLen-emBits))) != 0 {
return ErrVerification
}
// 7. Let dbMask = MGF(H, emLen - hLen - 1).
//
// 8. Let DB = maskedDB \xor dbMask.
mgf1XOR(db, hash, h)
// 9. Set the leftmost 8 * emLen - emBits bits of the leftmost octet in DB
// to zero.
db[0] &= (0xFF >> uint(8*emLen-emBits))
if sLen == PSSSaltLengthAuto {
FindSaltLength:
for sLen = emLen - (hLen + 2); sLen >= 0; sLen-- {
switch db[emLen-hLen-sLen-2] {
case 1:
break FindSaltLength
case 0:
continue
default:
return ErrVerification
}
}
if sLen < 0 {
return ErrVerification
}
} else {
// 10. If the emLen - hLen - sLen - 2 leftmost octets of DB are not zero
// or if the octet at position emLen - hLen - sLen - 1 (the leftmost
// position is "position 1") does not have hexadecimal value 0x01,
// output "inconsistent" and stop.
for _, e := range db[:emLen-hLen-sLen-2] {
if e != 0x00 {
return ErrVerification
}
}
if db[emLen-hLen-sLen-2] != 0x01 {
return ErrVerification
}
}
// 11. Let salt be the last sLen octets of DB.
salt := db[len(db)-sLen:]
// 12. Let
// M' = (0x)00 00 00 00 00 00 00 00 || mHash || salt ;
// M' is an octet string of length 8 + hLen + sLen with eight
// initial zero octets.
//
// 13. Let H' = Hash(M'), an octet string of length hLen.
var prefix [8]byte
hash.Write(prefix[:])
hash.Write(mHash)
hash.Write(salt)
h0 := hash.Sum(nil)
// 14. If H = H', output "consistent." Otherwise, output "inconsistent."
if !bytes.Equal(h0, h) {
return ErrVerification
}
return nil
}
// signPSSWithSalt calculates the signature of hashed using PSS [1] with specified salt.
// Note that hashed must be the result of hashing the input message using the
// given hash function. salt is a random sequence of bytes whose length will be
// later used to verify the signature.
func signPSSWithSalt(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed, salt []byte) (s []byte, err error) {
nBits := priv.N.BitLen()
em, err := emsaPSSEncode(hashed, nBits-1, salt, hash.New())
if err != nil {
return
}
m := new(big.Int).SetBytes(em)
c, err := decryptAndCheck(rand, priv, m)
if err != nil {
return
}
s = make([]byte, (nBits+7)/8)
copyWithLeftPad(s, c.Bytes())
return
}
const (
// PSSSaltLengthAuto causes the salt in a PSS signature to be as large
// as possible when signing, and to be auto-detected when verifying.
PSSSaltLengthAuto = 0
// PSSSaltLengthEqualsHash causes the salt length to equal the length
// of the hash used in the signature.
PSSSaltLengthEqualsHash = -1
)
// PSSOptions contains options for creating and verifying PSS signatures.
type PSSOptions struct {
// SaltLength controls the length of the salt used in the PSS
// signature. It can either be a number of bytes, or one of the special
// PSSSaltLength constants.
SaltLength int
// Hash, if not zero, overrides the hash function passed to SignPSS.
// This is the only way to specify the hash function when using the
// crypto.Signer interface.
Hash crypto.Hash
}
// HashFunc returns pssOpts.Hash so that PSSOptions implements
// crypto.SignerOpts.
func (pssOpts *PSSOptions) HashFunc() crypto.Hash {
return pssOpts.Hash
}
func (opts *PSSOptions) saltLength() int {
if opts == nil {
return PSSSaltLengthAuto
}
return opts.SaltLength
}
// SignPSS calculates the signature of hashed using RSASSA-PSS [1].
// Note that hashed must be the result of hashing the input message using the
// given hash function. The opts argument may be nil, in which case sensible
// defaults are used.
func SignPSS(rand io.Reader, priv *PrivateKey, hash crypto.Hash, hashed []byte, opts *PSSOptions) (s []byte, err error) {
saltLength := opts.saltLength()
switch saltLength {
case PSSSaltLengthAuto:
saltLength = (priv.N.BitLen()+7)/8 - 2 - hash.Size()
case PSSSaltLengthEqualsHash:
saltLength = hash.Size()
}
if opts != nil && opts.Hash != 0 {
hash = opts.Hash
}
salt := make([]byte, saltLength)
if _, err = io.ReadFull(rand, salt); err != nil {
return
}
return signPSSWithSalt(rand, priv, hash, hashed, salt)
}
// VerifyPSS verifies a PSS signature.
// hashed is the result of hashing the input message using the given hash
// function and sig is the signature. A valid signature is indicated by
// returning a nil error. The opts argument may be nil, in which case sensible
// defaults are used.
func VerifyPSS(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte, opts *PSSOptions) error {
return verifyPSS(pub, hash, hashed, sig, opts.saltLength())
}
// verifyPSS verifies a PSS signature with the given salt length.
func verifyPSS(pub *PublicKey, hash crypto.Hash, hashed []byte, sig []byte, saltLen int) error {
nBits := pub.N.BitLen()
if len(sig) != (nBits+7)/8 {
return ErrVerification
}
s := new(big.Int).SetBytes(sig)
m := encrypt(new(big.Int), pub, s)
emBits := nBits - 1
emLen := (emBits + 7) / 8
if emLen < len(m.Bytes()) {
return ErrVerification
}
em := make([]byte, emLen)
copyWithLeftPad(em, m.Bytes())
if saltLen == PSSSaltLengthEqualsHash {
saltLen = hash.Size()
}
return emsaPSSVerify(hashed, em, emBits, saltLen, hash.New())
}

646
vendor/github.com/keybase/go-crypto/rsa/rsa.go generated vendored Normal file
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@ -0,0 +1,646 @@
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package rsa implements RSA encryption as specified in PKCS#1.
//
// RSA is a single, fundamental operation that is used in this package to
// implement either public-key encryption or public-key signatures.
//
// The original specification for encryption and signatures with RSA is PKCS#1
// and the terms "RSA encryption" and "RSA signatures" by default refer to
// PKCS#1 version 1.5. However, that specification has flaws and new designs
// should use version two, usually called by just OAEP and PSS, where
// possible.
//
// Two sets of interfaces are included in this package. When a more abstract
// interface isn't neccessary, there are functions for encrypting/decrypting
// with v1.5/OAEP and signing/verifying with v1.5/PSS. If one needs to abstract
// over the public-key primitive, the PrivateKey struct implements the
// Decrypter and Signer interfaces from the crypto package.
package rsa
import (
"crypto"
"crypto/rand"
"crypto/subtle"
"errors"
"hash"
"io"
"math/big"
)
var bigZero = big.NewInt(0)
var bigOne = big.NewInt(1)
// A PublicKey represents the public part of an RSA key.
type PublicKey struct {
N *big.Int // modulus
E int64 // public exponent
}
// OAEPOptions is an interface for passing options to OAEP decryption using the
// crypto.Decrypter interface.
type OAEPOptions struct {
// Hash is the hash function that will be used when generating the mask.
Hash crypto.Hash
// Label is an arbitrary byte string that must be equal to the value
// used when encrypting.
Label []byte
}
var (
errPublicModulus = errors.New("crypto/rsa: missing public modulus")
errPublicExponentSmall = errors.New("crypto/rsa: public exponent too small")
errPublicExponentLarge = errors.New("crypto/rsa: public exponent too large")
)
// checkPub sanity checks the public key before we use it.
// We require pub.E to fit into a 32-bit integer so that we
// do not have different behavior depending on whether
// int is 32 or 64 bits. See also
// http://www.imperialviolet.org/2012/03/16/rsae.html.
func checkPub(pub *PublicKey) error {
if pub.N == nil {
return errPublicModulus
}
if pub.E < 2 {
return errPublicExponentSmall
}
if pub.E > 1<<63-1 {
return errPublicExponentLarge
}
return nil
}
// A PrivateKey represents an RSA key
type PrivateKey struct {
PublicKey // public part.
D *big.Int // private exponent
Primes []*big.Int // prime factors of N, has >= 2 elements.
// Precomputed contains precomputed values that speed up private
// operations, if available.
Precomputed PrecomputedValues
}
// Public returns the public key corresponding to priv.
func (priv *PrivateKey) Public() crypto.PublicKey {
return &priv.PublicKey
}
// Sign signs msg with priv, reading randomness from rand. If opts is a
// *PSSOptions then the PSS algorithm will be used, otherwise PKCS#1 v1.5 will
// be used. This method is intended to support keys where the private part is
// kept in, for example, a hardware module. Common uses should use the Sign*
// functions in this package.
func (priv *PrivateKey) Sign(rand io.Reader, msg []byte, opts crypto.SignerOpts) ([]byte, error) {
if pssOpts, ok := opts.(*PSSOptions); ok {
return SignPSS(rand, priv, pssOpts.Hash, msg, pssOpts)
}
return SignPKCS1v15(rand, priv, opts.HashFunc(), msg)
}
// Decrypt decrypts ciphertext with priv. If opts is nil or of type
// *PKCS1v15DecryptOptions then PKCS#1 v1.5 decryption is performed. Otherwise
// opts must have type *OAEPOptions and OAEP decryption is done.
func (priv *PrivateKey) Decrypt(rand io.Reader, ciphertext []byte, opts crypto.DecrypterOpts) (plaintext []byte, err error) {
if opts == nil {
return DecryptPKCS1v15(rand, priv, ciphertext)
}
switch opts := opts.(type) {
case *OAEPOptions:
return DecryptOAEP(opts.Hash.New(), rand, priv, ciphertext, opts.Label)
case *PKCS1v15DecryptOptions:
if l := opts.SessionKeyLen; l > 0 {
plaintext = make([]byte, l)
if _, err := io.ReadFull(rand, plaintext); err != nil {
return nil, err
}
if err := DecryptPKCS1v15SessionKey(rand, priv, ciphertext, plaintext); err != nil {
return nil, err
}
return plaintext, nil
} else {
return DecryptPKCS1v15(rand, priv, ciphertext)
}
default:
return nil, errors.New("crypto/rsa: invalid options for Decrypt")
}
}
type PrecomputedValues struct {
Dp, Dq *big.Int // D mod (P-1) (or mod Q-1)
Qinv *big.Int // Q^-1 mod P
// CRTValues is used for the 3rd and subsequent primes. Due to a
// historical accident, the CRT for the first two primes is handled
// differently in PKCS#1 and interoperability is sufficiently
// important that we mirror this.
CRTValues []CRTValue
}
// CRTValue contains the precomputed Chinese remainder theorem values.
type CRTValue struct {
Exp *big.Int // D mod (prime-1).
Coeff *big.Int // R·Coeff ≡ 1 mod Prime.
R *big.Int // product of primes prior to this (inc p and q).
}
// Validate performs basic sanity checks on the key.
// It returns nil if the key is valid, or else an error describing a problem.
func (priv *PrivateKey) Validate() error {
if err := checkPub(&priv.PublicKey); err != nil {
return err
}
// Check that Πprimes == n.
modulus := new(big.Int).Set(bigOne)
for _, prime := range priv.Primes {
// Any primes ≤ 1 will cause divide-by-zero panics later.
if prime.Cmp(bigOne) <= 0 {
return errors.New("crypto/rsa: invalid prime value")
}
modulus.Mul(modulus, prime)
}
if modulus.Cmp(priv.N) != 0 {
return errors.New("crypto/rsa: invalid modulus")
}
// Check that de ≡ 1 mod p-1, for each prime.
// This implies that e is coprime to each p-1 as e has a multiplicative
// inverse. Therefore e is coprime to lcm(p-1,q-1,r-1,...) =
// exponent(ℤ/nℤ). It also implies that a^de ≡ a mod p as a^(p-1) ≡ 1
// mod p. Thus a^de ≡ a mod n for all a coprime to n, as required.
congruence := new(big.Int)
de := new(big.Int).SetInt64(int64(priv.E))
de.Mul(de, priv.D)
for _, prime := range priv.Primes {
pminus1 := new(big.Int).Sub(prime, bigOne)
congruence.Mod(de, pminus1)
if congruence.Cmp(bigOne) != 0 {
return errors.New("crypto/rsa: invalid exponents")
}
}
return nil
}
// GenerateKey generates an RSA keypair of the given bit size using the
// random source random (for example, crypto/rand.Reader).
func GenerateKey(random io.Reader, bits int) (priv *PrivateKey, err error) {
return GenerateMultiPrimeKey(random, 2, bits)
}
// GenerateMultiPrimeKey generates a multi-prime RSA keypair of the given bit
// size and the given random source, as suggested in [1]. Although the public
// keys are compatible (actually, indistinguishable) from the 2-prime case,
// the private keys are not. Thus it may not be possible to export multi-prime
// private keys in certain formats or to subsequently import them into other
// code.
//
// Table 1 in [2] suggests maximum numbers of primes for a given size.
//
// [1] US patent 4405829 (1972, expired)
// [2] http://www.cacr.math.uwaterloo.ca/techreports/2006/cacr2006-16.pdf
func GenerateMultiPrimeKey(random io.Reader, nprimes int, bits int) (priv *PrivateKey, err error) {
priv = new(PrivateKey)
priv.E = 65537
if nprimes < 2 {
return nil, errors.New("crypto/rsa: GenerateMultiPrimeKey: nprimes must be >= 2")
}
primes := make([]*big.Int, nprimes)
NextSetOfPrimes:
for {
todo := bits
// crypto/rand should set the top two bits in each prime.
// Thus each prime has the form
// p_i = 2^bitlen(p_i) × 0.11... (in base 2).
// And the product is:
// P = 2^todo × α
// where α is the product of nprimes numbers of the form 0.11...
//
// If α < 1/2 (which can happen for nprimes > 2), we need to
// shift todo to compensate for lost bits: the mean value of 0.11...
// is 7/8, so todo + shift - nprimes * log2(7/8) ~= bits - 1/2
// will give good results.
if nprimes >= 7 {
todo += (nprimes - 2) / 5
}
for i := 0; i < nprimes; i++ {
primes[i], err = rand.Prime(random, todo/(nprimes-i))
if err != nil {
return nil, err
}
todo -= primes[i].BitLen()
}
// Make sure that primes is pairwise unequal.
for i, prime := range primes {
for j := 0; j < i; j++ {
if prime.Cmp(primes[j]) == 0 {
continue NextSetOfPrimes
}
}
}
n := new(big.Int).Set(bigOne)
totient := new(big.Int).Set(bigOne)
pminus1 := new(big.Int)
for _, prime := range primes {
n.Mul(n, prime)
pminus1.Sub(prime, bigOne)
totient.Mul(totient, pminus1)
}
if n.BitLen() != bits {
// This should never happen for nprimes == 2 because
// crypto/rand should set the top two bits in each prime.
// For nprimes > 2 we hope it does not happen often.
continue NextSetOfPrimes
}
g := new(big.Int)
priv.D = new(big.Int)
y := new(big.Int)
e := big.NewInt(int64(priv.E))
g.GCD(priv.D, y, e, totient)
if g.Cmp(bigOne) == 0 {
if priv.D.Sign() < 0 {
priv.D.Add(priv.D, totient)
}
priv.Primes = primes
priv.N = n
break
}
}
priv.Precompute()
return
}
// incCounter increments a four byte, big-endian counter.
func incCounter(c *[4]byte) {
if c[3]++; c[3] != 0 {
return
}
if c[2]++; c[2] != 0 {
return
}
if c[1]++; c[1] != 0 {
return
}
c[0]++
}
// mgf1XOR XORs the bytes in out with a mask generated using the MGF1 function
// specified in PKCS#1 v2.1.
func mgf1XOR(out []byte, hash hash.Hash, seed []byte) {
var counter [4]byte
var digest []byte
done := 0
for done < len(out) {
hash.Write(seed)
hash.Write(counter[0:4])
digest = hash.Sum(digest[:0])
hash.Reset()
for i := 0; i < len(digest) && done < len(out); i++ {
out[done] ^= digest[i]
done++
}
incCounter(&counter)
}
}
// ErrMessageTooLong is returned when attempting to encrypt a message which is
// too large for the size of the public key.
var ErrMessageTooLong = errors.New("crypto/rsa: message too long for RSA public key size")
func encrypt(c *big.Int, pub *PublicKey, m *big.Int) *big.Int {
e := big.NewInt(int64(pub.E))
c.Exp(m, e, pub.N)
return c
}
// EncryptOAEP encrypts the given message with RSA-OAEP.
//
// OAEP is parameterised by a hash function that is used as a random oracle.
// Encryption and decryption of a given message must use the same hash function
// and sha256.New() is a reasonable choice.
//
// The random parameter is used as a source of entropy to ensure that
// encrypting the same message twice doesn't result in the same ciphertext.
//
// The label parameter may contain arbitrary data that will not be encrypted,
// but which gives important context to the message. For example, if a given
// public key is used to decrypt two types of messages then distinct label
// values could be used to ensure that a ciphertext for one purpose cannot be
// used for another by an attacker. If not required it can be empty.
//
// The message must be no longer than the length of the public modulus less
// twice the hash length plus 2.
func EncryptOAEP(hash hash.Hash, random io.Reader, pub *PublicKey, msg []byte, label []byte) (out []byte, err error) {
if err := checkPub(pub); err != nil {
return nil, err
}
hash.Reset()
k := (pub.N.BitLen() + 7) / 8
if len(msg) > k-2*hash.Size()-2 {
err = ErrMessageTooLong
return
}
hash.Write(label)
lHash := hash.Sum(nil)
hash.Reset()
em := make([]byte, k)
seed := em[1 : 1+hash.Size()]
db := em[1+hash.Size():]
copy(db[0:hash.Size()], lHash)
db[len(db)-len(msg)-1] = 1
copy(db[len(db)-len(msg):], msg)
_, err = io.ReadFull(random, seed)
if err != nil {
return
}
mgf1XOR(db, hash, seed)
mgf1XOR(seed, hash, db)
m := new(big.Int)
m.SetBytes(em)
c := encrypt(new(big.Int), pub, m)
out = c.Bytes()
if len(out) < k {
// If the output is too small, we need to left-pad with zeros.
t := make([]byte, k)
copy(t[k-len(out):], out)
out = t
}
return
}
// ErrDecryption represents a failure to decrypt a message.
// It is deliberately vague to avoid adaptive attacks.
var ErrDecryption = errors.New("crypto/rsa: decryption error")
// ErrVerification represents a failure to verify a signature.
// It is deliberately vague to avoid adaptive attacks.
var ErrVerification = errors.New("crypto/rsa: verification error")
// modInverse returns ia, the inverse of a in the multiplicative group of prime
// order n. It requires that a be a member of the group (i.e. less than n).
func modInverse(a, n *big.Int) (ia *big.Int, ok bool) {
g := new(big.Int)
x := new(big.Int)
y := new(big.Int)
g.GCD(x, y, a, n)
if g.Cmp(bigOne) != 0 {
// In this case, a and n aren't coprime and we cannot calculate
// the inverse. This happens because the values of n are nearly
// prime (being the product of two primes) rather than truly
// prime.
return
}
if x.Cmp(bigOne) < 0 {
// 0 is not the multiplicative inverse of any element so, if x
// < 1, then x is negative.
x.Add(x, n)
}
return x, true
}
// Precompute performs some calculations that speed up private key operations
// in the future.
func (priv *PrivateKey) Precompute() {
if priv.Precomputed.Dp != nil {
return
}
priv.Precomputed.Dp = new(big.Int).Sub(priv.Primes[0], bigOne)
priv.Precomputed.Dp.Mod(priv.D, priv.Precomputed.Dp)
priv.Precomputed.Dq = new(big.Int).Sub(priv.Primes[1], bigOne)
priv.Precomputed.Dq.Mod(priv.D, priv.Precomputed.Dq)
priv.Precomputed.Qinv = new(big.Int).ModInverse(priv.Primes[1], priv.Primes[0])
r := new(big.Int).Mul(priv.Primes[0], priv.Primes[1])
priv.Precomputed.CRTValues = make([]CRTValue, len(priv.Primes)-2)
for i := 2; i < len(priv.Primes); i++ {
prime := priv.Primes[i]
values := &priv.Precomputed.CRTValues[i-2]
values.Exp = new(big.Int).Sub(prime, bigOne)
values.Exp.Mod(priv.D, values.Exp)
values.R = new(big.Int).Set(r)
values.Coeff = new(big.Int).ModInverse(r, prime)
r.Mul(r, prime)
}
}
// decrypt performs an RSA decryption, resulting in a plaintext integer. If a
// random source is given, RSA blinding is used.
func decrypt(random io.Reader, priv *PrivateKey, c *big.Int) (m *big.Int, err error) {
// TODO(agl): can we get away with reusing blinds?
if c.Cmp(priv.N) > 0 {
err = ErrDecryption
return
}
var ir *big.Int
if random != nil {
// Blinding enabled. Blinding involves multiplying c by r^e.
// Then the decryption operation performs (m^e * r^e)^d mod n
// which equals mr mod n. The factor of r can then be removed
// by multiplying by the multiplicative inverse of r.
var r *big.Int
for {
r, err = rand.Int(random, priv.N)
if err != nil {
return
}
if r.Cmp(bigZero) == 0 {
r = bigOne
}
var ok bool
ir, ok = modInverse(r, priv.N)
if ok {
break
}
}
bigE := big.NewInt(int64(priv.E))
rpowe := new(big.Int).Exp(r, bigE, priv.N)
cCopy := new(big.Int).Set(c)
cCopy.Mul(cCopy, rpowe)
cCopy.Mod(cCopy, priv.N)
c = cCopy
}
if priv.Precomputed.Dp == nil {
m = new(big.Int).Exp(c, priv.D, priv.N)
} else {
// We have the precalculated values needed for the CRT.
m = new(big.Int).Exp(c, priv.Precomputed.Dp, priv.Primes[0])
m2 := new(big.Int).Exp(c, priv.Precomputed.Dq, priv.Primes[1])
m.Sub(m, m2)
if m.Sign() < 0 {
m.Add(m, priv.Primes[0])
}
m.Mul(m, priv.Precomputed.Qinv)
m.Mod(m, priv.Primes[0])
m.Mul(m, priv.Primes[1])
m.Add(m, m2)
for i, values := range priv.Precomputed.CRTValues {
prime := priv.Primes[2+i]
m2.Exp(c, values.Exp, prime)
m2.Sub(m2, m)
m2.Mul(m2, values.Coeff)
m2.Mod(m2, prime)
if m2.Sign() < 0 {
m2.Add(m2, prime)
}
m2.Mul(m2, values.R)
m.Add(m, m2)
}
}
if ir != nil {
// Unblind.
m.Mul(m, ir)
m.Mod(m, priv.N)
}
return
}
func decryptAndCheck(random io.Reader, priv *PrivateKey, c *big.Int) (m *big.Int, err error) {
m, err = decrypt(random, priv, c)
if err != nil {
return nil, err
}
// In order to defend against errors in the CRT computation, m^e is
// calculated, which should match the original ciphertext.
check := encrypt(new(big.Int), &priv.PublicKey, m)
if c.Cmp(check) != 0 {
return nil, errors.New("rsa: internal error")
}
return m, nil
}
// DecryptOAEP decrypts ciphertext using RSA-OAEP.
// OAEP is parameterised by a hash function that is used as a random oracle.
// Encryption and decryption of a given message must use the same hash function
// and sha256.New() is a reasonable choice.
//
// The random parameter, if not nil, is used to blind the private-key operation
// and avoid timing side-channel attacks. Blinding is purely internal to this
// function – the random data need not match that used when encrypting.
//
// The label parameter must match the value given when encrypting. See
// EncryptOAEP for details.
func DecryptOAEP(hash hash.Hash, random io.Reader, priv *PrivateKey, ciphertext []byte, label []byte) (msg []byte, err error) {
if err := checkPub(&priv.PublicKey); err != nil {
return nil, err
}
k := (priv.N.BitLen() + 7) / 8
if len(ciphertext) > k ||
k < hash.Size()*2+2 {
err = ErrDecryption
return
}
c := new(big.Int).SetBytes(ciphertext)
m, err := decrypt(random, priv, c)
if err != nil {
return
}
hash.Write(label)
lHash := hash.Sum(nil)
hash.Reset()
// Converting the plaintext number to bytes will strip any
// leading zeros so we may have to left pad. We do this unconditionally
// to avoid leaking timing information. (Although we still probably
// leak the number of leading zeros. It's not clear that we can do
// anything about this.)
em := leftPad(m.Bytes(), k)
firstByteIsZero := subtle.ConstantTimeByteEq(em[0], 0)
seed := em[1 : hash.Size()+1]
db := em[hash.Size()+1:]
mgf1XOR(seed, hash, db)
mgf1XOR(db, hash, seed)
lHash2 := db[0:hash.Size()]
// We have to validate the plaintext in constant time in order to avoid
// attacks like: J. Manger. A Chosen Ciphertext Attack on RSA Optimal
// Asymmetric Encryption Padding (OAEP) as Standardized in PKCS #1
// v2.0. In J. Kilian, editor, Advances in Cryptology.
lHash2Good := subtle.ConstantTimeCompare(lHash, lHash2)
// The remainder of the plaintext must be zero or more 0x00, followed
// by 0x01, followed by the message.
// lookingForIndex: 1 iff we are still looking for the 0x01
// index: the offset of the first 0x01 byte
// invalid: 1 iff we saw a non-zero byte before the 0x01.
var lookingForIndex, index, invalid int
lookingForIndex = 1
rest := db[hash.Size():]
for i := 0; i < len(rest); i++ {
equals0 := subtle.ConstantTimeByteEq(rest[i], 0)
equals1 := subtle.ConstantTimeByteEq(rest[i], 1)
index = subtle.ConstantTimeSelect(lookingForIndex&equals1, i, index)
lookingForIndex = subtle.ConstantTimeSelect(equals1, 0, lookingForIndex)
invalid = subtle.ConstantTimeSelect(lookingForIndex&^equals0, 1, invalid)
}
if firstByteIsZero&lHash2Good&^invalid&^lookingForIndex != 1 {
err = ErrDecryption
return
}
msg = rest[index+1:]
return
}
// leftPad returns a new slice of length size. The contents of input are right
// aligned in the new slice.
func leftPad(input []byte, size int) (out []byte) {
n := len(input)
if n > size {
n = size
}
out = make([]byte, size)
copy(out[len(out)-n:], input)
return
}

637
vendor/golang.org/x/crypto/openpgp/keys.go generated vendored
View file

@ -1,637 +0,0 @@
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package openpgp
import (
"crypto/rsa"
"io"
"time"
"golang.org/x/crypto/openpgp/armor"
"golang.org/x/crypto/openpgp/errors"
"golang.org/x/crypto/openpgp/packet"
)
// PublicKeyType is the armor type for a PGP public key.
var PublicKeyType = "PGP PUBLIC KEY BLOCK"
// PrivateKeyType is the armor type for a PGP private key.
var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
// An Entity represents the components of an OpenPGP key: a primary public key
// (which must be a signing key), one or more identities claimed by that key,
// and zero or more subkeys, which may be encryption keys.
type Entity struct {
PrimaryKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Identities map[string]*Identity // indexed by Identity.Name
Revocations []*packet.Signature
Subkeys []Subkey
}
// An Identity represents an identity claimed by an Entity and zero or more
// assertions by other entities about that claim.
type Identity struct {
Name string // by convention, has the form "Full Name (comment) <email@example.com>"
UserId *packet.UserId
SelfSignature *packet.Signature
Signatures []*packet.Signature
}
// A Subkey is an additional public key in an Entity. Subkeys can be used for
// encryption.
type Subkey struct {
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
Sig *packet.Signature
}
// A Key identifies a specific public key in an Entity. This is either the
// Entity's primary key or a subkey.
type Key struct {
Entity *Entity
PublicKey *packet.PublicKey
PrivateKey *packet.PrivateKey
SelfSignature *packet.Signature
}
// A KeyRing provides access to public and private keys.
type KeyRing interface {
// KeysById returns the set of keys that have the given key id.
KeysById(id uint64) []Key
// KeysByIdAndUsage returns the set of keys with the given id
// that also meet the key usage given by requiredUsage.
// The requiredUsage is expressed as the bitwise-OR of
// packet.KeyFlag* values.
KeysByIdUsage(id uint64, requiredUsage byte) []Key
// DecryptionKeys returns all private keys that are valid for
// decryption.
DecryptionKeys() []Key
}
// primaryIdentity returns the Identity marked as primary or the first identity
// if none are so marked.
func (e *Entity) primaryIdentity() *Identity {
var firstIdentity *Identity
for _, ident := range e.Identities {
if firstIdentity == nil {
firstIdentity = ident
}
if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
return ident
}
}
return firstIdentity
}
// encryptionKey returns the best candidate Key for encrypting a message to the
// given Entity.
func (e *Entity) encryptionKey(now time.Time) (Key, bool) {
candidateSubkey := -1
// Iterate the keys to find the newest key
var maxTime time.Time
for i, subkey := range e.Subkeys {
if subkey.Sig.FlagsValid &&
subkey.Sig.FlagEncryptCommunications &&
subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
!subkey.Sig.KeyExpired(now) &&
(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
candidateSubkey = i
maxTime = subkey.Sig.CreationTime
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
}
// If we don't have any candidate subkeys for encryption and
// the primary key doesn't have any usage metadata then we
// assume that the primary key is ok. Or, if the primary key is
// marked as ok to encrypt to, then we can obviously use it.
i := e.primaryIdentity()
if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications &&
e.PrimaryKey.PubKeyAlgo.CanEncrypt() &&
!i.SelfSignature.KeyExpired(now) {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
}
// This Entity appears to be signing only.
return Key{}, false
}
// signingKey return the best candidate Key for signing a message with this
// Entity.
func (e *Entity) signingKey(now time.Time) (Key, bool) {
candidateSubkey := -1
for i, subkey := range e.Subkeys {
if subkey.Sig.FlagsValid &&
subkey.Sig.FlagSign &&
subkey.PublicKey.PubKeyAlgo.CanSign() &&
!subkey.Sig.KeyExpired(now) {
candidateSubkey = i
break
}
}
if candidateSubkey != -1 {
subkey := e.Subkeys[candidateSubkey]
return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
}
// If we have no candidate subkey then we assume that it's ok to sign
// with the primary key.
i := e.primaryIdentity()
if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign &&
!i.SelfSignature.KeyExpired(now) {
return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
}
return Key{}, false
}
// An EntityList contains one or more Entities.
type EntityList []*Entity
// KeysById returns the set of keys that have the given key id.
func (el EntityList) KeysById(id uint64) (keys []Key) {
for _, e := range el {
if e.PrimaryKey.KeyId == id {
var selfSig *packet.Signature
for _, ident := range e.Identities {
if selfSig == nil {
selfSig = ident.SelfSignature
} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
selfSig = ident.SelfSignature
break
}
}
keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig})
}
for _, subKey := range e.Subkeys {
if subKey.PublicKey.KeyId == id {
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
}
}
}
return
}
// KeysByIdAndUsage returns the set of keys with the given id that also meet
// the key usage given by requiredUsage. The requiredUsage is expressed as
// the bitwise-OR of packet.KeyFlag* values.
func (el EntityList) KeysByIdUsage(id uint64, requiredUsage byte) (keys []Key) {
for _, key := range el.KeysById(id) {
if len(key.Entity.Revocations) > 0 {
continue
}
if key.SelfSignature.RevocationReason != nil {
continue
}
if key.SelfSignature.FlagsValid && requiredUsage != 0 {
var usage byte
if key.SelfSignature.FlagCertify {
usage |= packet.KeyFlagCertify
}
if key.SelfSignature.FlagSign {
usage |= packet.KeyFlagSign
}
if key.SelfSignature.FlagEncryptCommunications {
usage |= packet.KeyFlagEncryptCommunications
}
if key.SelfSignature.FlagEncryptStorage {
usage |= packet.KeyFlagEncryptStorage
}
if usage&requiredUsage != requiredUsage {
continue
}
}
keys = append(keys, key)
}
return
}
// DecryptionKeys returns all private keys that are valid for decryption.
func (el EntityList) DecryptionKeys() (keys []Key) {
for _, e := range el {
for _, subKey := range e.Subkeys {
if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
}
}
}
return
}
// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
block, err := armor.Decode(r)
if err == io.EOF {
return nil, errors.InvalidArgumentError("no armored data found")
}
if err != nil {
return nil, err
}
if block.Type != PublicKeyType && block.Type != PrivateKeyType {
return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
}
return ReadKeyRing(block.Body)
}
// ReadKeyRing reads one or more public/private keys. Unsupported keys are
// ignored as long as at least a single valid key is found.
func ReadKeyRing(r io.Reader) (el EntityList, err error) {
packets := packet.NewReader(r)
var lastUnsupportedError error
for {
var e *Entity
e, err = ReadEntity(packets)
if err != nil {
// TODO: warn about skipped unsupported/unreadable keys
if _, ok := err.(errors.UnsupportedError); ok {
lastUnsupportedError = err
err = readToNextPublicKey(packets)
} else if _, ok := err.(errors.StructuralError); ok {
// Skip unreadable, badly-formatted keys
lastUnsupportedError = err
err = readToNextPublicKey(packets)
}
if err == io.EOF {
err = nil
break
}
if err != nil {
el = nil
break
}
} else {
el = append(el, e)
}
}
if len(el) == 0 && err == nil {
err = lastUnsupportedError
}
return
}
// readToNextPublicKey reads packets until the start of the entity and leaves
// the first packet of the new entity in the Reader.
func readToNextPublicKey(packets *packet.Reader) (err error) {
var p packet.Packet
for {
p, err = packets.Next()
if err == io.EOF {
return
} else if err != nil {
if _, ok := err.(errors.UnsupportedError); ok {
err = nil
continue
}
return
}
if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
packets.Unread(p)
return
}
}
}
// ReadEntity reads an entity (public key, identities, subkeys etc) from the
// given Reader.
func ReadEntity(packets *packet.Reader) (*Entity, error) {
e := new(Entity)
e.Identities = make(map[string]*Identity)
p, err := packets.Next()
if err != nil {
return nil, err
}
var ok bool
if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
packets.Unread(p)
return nil, errors.StructuralError("first packet was not a public/private key")
} else {
e.PrimaryKey = &e.PrivateKey.PublicKey
}
}
if !e.PrimaryKey.PubKeyAlgo.CanSign() {
return nil, errors.StructuralError("primary key cannot be used for signatures")
}
var current *Identity
var revocations []*packet.Signature
EachPacket:
for {
p, err := packets.Next()
if err == io.EOF {
break
} else if err != nil {
return nil, err
}
switch pkt := p.(type) {
case *packet.UserId:
current = new(Identity)
current.Name = pkt.Id
current.UserId = pkt
e.Identities[pkt.Id] = current
for {
p, err = packets.Next()
if err == io.EOF {
return nil, io.ErrUnexpectedEOF
} else if err != nil {
return nil, err
}
sig, ok := p.(*packet.Signature)
if !ok {
return nil, errors.StructuralError("user ID packet not followed by self-signature")
}
if (sig.SigType == packet.SigTypePositiveCert || sig.SigType == packet.SigTypeGenericCert) && sig.IssuerKeyId != nil && *sig.IssuerKeyId == e.PrimaryKey.KeyId {
if err = e.PrimaryKey.VerifyUserIdSignature(pkt.Id, e.PrimaryKey, sig); err != nil {
return nil, errors.StructuralError("user ID self-signature invalid: " + err.Error())
}
current.SelfSignature = sig
break
}
current.Signatures = append(current.Signatures, sig)
}
case *packet.Signature:
if pkt.SigType == packet.SigTypeKeyRevocation {
revocations = append(revocations, pkt)
} else if pkt.SigType == packet.SigTypeDirectSignature {
// TODO: RFC4880 5.2.1 permits signatures
// directly on keys (eg. to bind additional
// revocation keys).
} else if current == nil {
return nil, errors.StructuralError("signature packet found before user id packet")
} else {
current.Signatures = append(current.Signatures, pkt)
}
case *packet.PrivateKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, &pkt.PublicKey, pkt)
if err != nil {
return nil, err
}
case *packet.PublicKey:
if pkt.IsSubkey == false {
packets.Unread(p)
break EachPacket
}
err = addSubkey(e, packets, pkt, nil)
if err != nil {
return nil, err
}
default:
// we ignore unknown packets
}
}
if len(e.Identities) == 0 {
return nil, errors.StructuralError("entity without any identities")
}
for _, revocation := range revocations {
err = e.PrimaryKey.VerifyRevocationSignature(revocation)
if err == nil {
e.Revocations = append(e.Revocations, revocation)
} else {
// TODO: RFC 4880 5.2.3.15 defines revocation keys.
return nil, errors.StructuralError("revocation signature signed by alternate key")
}
}
return e, nil
}
func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
var subKey Subkey
subKey.PublicKey = pub
subKey.PrivateKey = priv
p, err := packets.Next()
if err == io.EOF {
return io.ErrUnexpectedEOF
}
if err != nil {
return errors.StructuralError("subkey signature invalid: " + err.Error())
}
var ok bool
subKey.Sig, ok = p.(*packet.Signature)
if !ok {
return errors.StructuralError("subkey packet not followed by signature")
}
if subKey.Sig.SigType != packet.SigTypeSubkeyBinding && subKey.Sig.SigType != packet.SigTypeSubkeyRevocation {
return errors.StructuralError("subkey signature with wrong type")
}
err = e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, subKey.Sig)
if err != nil {
return errors.StructuralError("subkey signature invalid: " + err.Error())
}
e.Subkeys = append(e.Subkeys, subKey)
return nil
}
const defaultRSAKeyBits = 2048
// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
// single identity composed of the given full name, comment and email, any of
// which may be empty but must not contain any of "()<>\x00".
// If config is nil, sensible defaults will be used.
func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
currentTime := config.Now()
bits := defaultRSAKeyBits
if config != nil && config.RSABits != 0 {
bits = config.RSABits
}
uid := packet.NewUserId(name, comment, email)
if uid == nil {
return nil, errors.InvalidArgumentError("user id field contained invalid characters")
}
signingPriv, err := rsa.GenerateKey(config.Random(), bits)
if err != nil {
return nil, err
}
encryptingPriv, err := rsa.GenerateKey(config.Random(), bits)
if err != nil {
return nil, err
}
e := &Entity{
PrimaryKey: packet.NewRSAPublicKey(currentTime, &signingPriv.PublicKey),
PrivateKey: packet.NewRSAPrivateKey(currentTime, signingPriv),
Identities: make(map[string]*Identity),
}
isPrimaryId := true
e.Identities[uid.Id] = &Identity{
Name: uid.Name,
UserId: uid,
SelfSignature: &packet.Signature{
CreationTime: currentTime,
SigType: packet.SigTypePositiveCert,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
IsPrimaryId: &isPrimaryId,
FlagsValid: true,
FlagSign: true,
FlagCertify: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
},
}
// If the user passes in a DefaultHash via packet.Config,
// set the PreferredHash for the SelfSignature.
if config != nil && config.DefaultHash != 0 {
e.Identities[uid.Id].SelfSignature.PreferredHash = []uint8{hashToHashId(config.DefaultHash)}
}
e.Subkeys = make([]Subkey, 1)
e.Subkeys[0] = Subkey{
PublicKey: packet.NewRSAPublicKey(currentTime, &encryptingPriv.PublicKey),
PrivateKey: packet.NewRSAPrivateKey(currentTime, encryptingPriv),
Sig: &packet.Signature{
CreationTime: currentTime,
SigType: packet.SigTypeSubkeyBinding,
PubKeyAlgo: packet.PubKeyAlgoRSA,
Hash: config.Hash(),
FlagsValid: true,
FlagEncryptStorage: true,
FlagEncryptCommunications: true,
IssuerKeyId: &e.PrimaryKey.KeyId,
},
}
e.Subkeys[0].PublicKey.IsSubkey = true
e.Subkeys[0].PrivateKey.IsSubkey = true
return e, nil
}
// SerializePrivate serializes an Entity, including private key material, to
// the given Writer. For now, it must only be used on an Entity returned from
// NewEntity.
// If config is nil, sensible defaults will be used.
func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
err = e.PrivateKey.Serialize(w)
if err != nil {
return
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return
}
err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
if err != nil {
return
}
err = ident.SelfSignature.Serialize(w)
if err != nil {
return
}
}
for _, subkey := range e.Subkeys {
err = subkey.PrivateKey.Serialize(w)
if err != nil {
return
}
err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
if err != nil {
return
}
err = subkey.Sig.Serialize(w)
if err != nil {
return
}
}
return nil
}
// Serialize writes the public part of the given Entity to w. (No private
// key material will be output).
func (e *Entity) Serialize(w io.Writer) error {
err := e.PrimaryKey.Serialize(w)
if err != nil {
return err
}
for _, ident := range e.Identities {
err = ident.UserId.Serialize(w)
if err != nil {
return err
}
err = ident.SelfSignature.Serialize(w)
if err != nil {
return err
}
for _, sig := range ident.Signatures {
err = sig.Serialize(w)
if err != nil {
return err
}
}
}
for _, subkey := range e.Subkeys {
err = subkey.PublicKey.Serialize(w)
if err != nil {
return err
}
err = subkey.Sig.Serialize(w)
if err != nil {
return err
}
}
return nil
}
// SignIdentity adds a signature to e, from signer, attesting that identity is
// associated with e. The provided identity must already be an element of
// e.Identities and the private key of signer must have been decrypted if
// necessary.
// If config is nil, sensible defaults will be used.
func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
if signer.PrivateKey == nil {
return errors.InvalidArgumentError("signing Entity must have a private key")
}
if signer.PrivateKey.Encrypted {
return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
}
ident, ok := e.Identities[identity]
if !ok {
return errors.InvalidArgumentError("given identity string not found in Entity")
}
sig := &packet.Signature{
SigType: packet.SigTypeGenericCert,
PubKeyAlgo: signer.PrivateKey.PubKeyAlgo,
Hash: config.Hash(),
CreationTime: config.Now(),
IssuerKeyId: &signer.PrivateKey.KeyId,
}
if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
return err
}
ident.Signatures = append(ident.Signatures, sig)
return nil
}

120
vendor/vendor.json vendored
View file

@ -515,6 +515,84 @@
"revision": "b2c7a7da5b2995941048f60146e67702a292e468",
"revisionTime": "2016-02-12T04:00:40Z"
},
{
"checksumSHA1": "VJk3rOWfxEV9Ilig5lgzH1qg8Ss=",
"path": "github.com/keybase/go-crypto/brainpool",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "rnRjEJs5luF+DIXp2J6LFcQk8Gg=",
"path": "github.com/keybase/go-crypto/cast5",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "F5++ZQS5Vt7hd6lxPCKTffvph1A=",
"path": "github.com/keybase/go-crypto/curve25519",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "IvrDXwIixB5yPPbo6tq1/1cSn78=",
"path": "github.com/keybase/go-crypto/ed25519",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "4+fslB6pCbplNq4viy6CrOkkY6Y=",
"path": "github.com/keybase/go-crypto/ed25519/internal/edwards25519",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "fgFlkfkaotUjBVhJik2979oCeJw=",
"path": "github.com/keybase/go-crypto/openpgp",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "+spfcEChljh3yeIg4K/xHOQ2pVM=",
"path": "github.com/keybase/go-crypto/openpgp/armor",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "nWhmwjBJqPSvkCWqaap2Z9EiS1k=",
"path": "github.com/keybase/go-crypto/openpgp/ecdh",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "uxXG9IC/XF8jwwvZUbW65+x8/+M=",
"path": "github.com/keybase/go-crypto/openpgp/elgamal",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "EyUf82Yknzc75m8RcA21CNQINw0=",
"path": "github.com/keybase/go-crypto/openpgp/errors",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "y16ATKgHL/k6rQZqdXP1sIAJxE0=",
"path": "github.com/keybase/go-crypto/openpgp/packet",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "BGDxg1Xtsz0DSPzdQGJLLQqfYc8=",
"path": "github.com/keybase/go-crypto/openpgp/s2k",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "rE3pp7b3gfcmBregzpIvN5IdFhY=",
"path": "github.com/keybase/go-crypto/rsa",
"revision": "00ac4db533f63ef97576cbc7b07939ff7daf7329",
"revisionTime": "2017-06-05T14:56:57Z"
},
{
"checksumSHA1": "fh+CcgeUUsnuwSORHYWg0ycbp+4=",
"path": "github.com/klauspost/compress/flate",
@ -1182,12 +1260,6 @@
"revision": "2c050d2dae5345c417db301f11fda6fbf5ad0f0a",
"revisionTime": "2016-09-14T08:04:27Z"
},
{
"checksumSHA1": "TT1rac6kpQp2vz24m5yDGUNQ/QQ=",
"path": "golang.org/x/crypto/cast5",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "dwOedwBJ1EIK9+S3t108Bx054Y8=",
"path": "golang.org/x/crypto/curve25519",
@ -1212,42 +1284,6 @@
"revision": "ede567c8e044a5913dad1d1af3696d9da953104c",
"revisionTime": "2016-11-04T19:41:44Z"
},
{
"checksumSHA1": "IIhFTrLlmlc6lEFSitqi4aw2lw0=",
"path": "golang.org/x/crypto/openpgp",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "olOKkhrdkYQHZ0lf1orrFQPQrv4=",
"path": "golang.org/x/crypto/openpgp/armor",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "eo/KtdjieJQXH7Qy+faXFcF70ME=",
"path": "golang.org/x/crypto/openpgp/elgamal",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "rlxVSaGgqdAgwblsErxTxIfuGfg=",
"path": "golang.org/x/crypto/openpgp/errors",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "LWdaR8Q9yn6eBCcnGl0HvJRDUBE=",
"path": "golang.org/x/crypto/openpgp/packet",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "s2qT4UwvzBSkzXuiuMkowif1Olw=",
"path": "golang.org/x/crypto/openpgp/s2k",
"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
"revisionTime": "2017-01-13T19:21:00Z"
},
{
"checksumSHA1": "1MGpGDQqnUoRpv7VEcQrXOBydXE=",
"path": "golang.org/x/crypto/pbkdf2",