woodpecker/server/services/encryption/aes.go

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// Copyright 2023 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package encryption
import (
"crypto/cipher"
"encoding/base64"
"fmt"
"github.com/google/tink/go/subtle/random"
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"go.woodpecker-ci.org/woodpecker/v2/server/services/encryption/types"
"go.woodpecker-ci.org/woodpecker/v2/server/store"
)
type aesEncryptionService struct {
cipher cipher.AEAD
keyID string
store store.Store
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clients []types.EncryptionClient
}
func (svc *aesEncryptionService) Encrypt(plaintext, associatedData string) (string, error) {
msg := []byte(plaintext)
aad := []byte(associatedData)
nonce := random.GetRandomBytes(uint32(AES_GCM_SIV_NonceSize))
ciphertext := svc.cipher.Seal(nil, nonce, msg, aad)
result := make([]byte, 0, AES_GCM_SIV_NonceSize+len(ciphertext))
result = append(result, nonce...)
result = append(result, ciphertext...)
return base64.StdEncoding.EncodeToString(result), nil
}
func (svc *aesEncryptionService) Decrypt(ciphertext, associatedData string) (string, error) {
bytes, err := base64.StdEncoding.DecodeString(ciphertext)
if err != nil {
return "", fmt.Errorf(errTemplateBase64DecryptionFailed, err)
}
nonce := bytes[:AES_GCM_SIV_NonceSize]
message := bytes[AES_GCM_SIV_NonceSize:]
plaintext, err := svc.cipher.Open(nil, nonce, message, []byte(associatedData))
if err != nil {
return "", fmt.Errorf(errTemplateDecryptionFailed, err)
}
return string(plaintext), nil
}
func (svc *aesEncryptionService) Disable() error {
return svc.disable()
}