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329 lines
9.8 KiB
C
329 lines
9.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-3-Clause
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*
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* Copyright (c) 2001-2007, by Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008-2012, by Randall Stewart. All rights reserved.
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* Copyright (c) 2008-2013, by Michael Tuexen. All rights reserved.
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* Copyright (c) 2013, by Lally Singh. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* a) Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* b) Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the distribution.
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*
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* c) Neither the name of Cisco Systems, Inc. nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
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* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
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* THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <netinet/sctp_sha1.h>
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#if defined(SCTP_USE_NSS_SHA1)
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/* A SHA-1 Digest is 160 bits, or 20 bytes */
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#define SHA_DIGEST_LENGTH (20)
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void
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sctp_sha1_init(struct sctp_sha1_context *ctx)
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{
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ctx->pk11_ctx = PK11_CreateDigestContext(SEC_OID_SHA1);
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PK11_DigestBegin(ctx->pk11_ctx);
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}
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void
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sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
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{
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PK11_DigestOp(ctx->pk11_ctx, ptr, siz);
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}
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void
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sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
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{
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unsigned int output_len = 0;
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PK11_DigestFinal(ctx->pk11_ctx, digest, &output_len, SHA_DIGEST_LENGTH);
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PK11_DestroyContext(ctx->pk11_ctx, PR_TRUE);
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}
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#elif defined(SCTP_USE_OPENSSL_SHA1)
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void
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sctp_sha1_init(struct sctp_sha1_context *ctx)
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{
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SHA1_Init(&ctx->sha_ctx);
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}
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void
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sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
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{
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SHA1_Update(&ctx->sha_ctx, ptr, (unsigned long)siz);
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}
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void
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sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
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{
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SHA1_Final(digest, &ctx->sha_ctx);
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}
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#else
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#include <string.h>
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#if defined(_WIN32) && defined(__Userspace__)
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#include <winsock2.h>
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#elif !(defined(_WIN32) && !defined(__Userspace__))
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#include <arpa/inet.h>
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#endif
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#define F1(B,C,D) (((B & C) | ((~B) & D))) /* 0 <= t <= 19 */
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#define F2(B,C,D) (B ^ C ^ D) /* 20 <= t <= 39 */
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#define F3(B,C,D) ((B & C) | (B & D) | (C & D)) /* 40 <= t <= 59 */
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#define F4(B,C,D) (B ^ C ^ D) /* 600 <= t <= 79 */
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/* circular shift */
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#define CSHIFT(A,B) ((B << A) | (B >> (32-A)))
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#define K1 0x5a827999 /* 0 <= t <= 19 */
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#define K2 0x6ed9eba1 /* 20 <= t <= 39 */
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#define K3 0x8f1bbcdc /* 40 <= t <= 59 */
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#define K4 0xca62c1d6 /* 60 <= t <= 79 */
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#define H0INIT 0x67452301
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#define H1INIT 0xefcdab89
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#define H2INIT 0x98badcfe
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#define H3INIT 0x10325476
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#define H4INIT 0xc3d2e1f0
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void
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sctp_sha1_init(struct sctp_sha1_context *ctx)
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{
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/* Init the SHA-1 context structure */
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ctx->A = 0;
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ctx->B = 0;
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ctx->C = 0;
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ctx->D = 0;
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ctx->E = 0;
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ctx->H0 = H0INIT;
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ctx->H1 = H1INIT;
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ctx->H2 = H2INIT;
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ctx->H3 = H3INIT;
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ctx->H4 = H4INIT;
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ctx->TEMP = 0;
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memset(ctx->words, 0, sizeof(ctx->words));
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ctx->how_many_in_block = 0;
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ctx->running_total = 0;
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}
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static void
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sctp_sha1_process_a_block(struct sctp_sha1_context *ctx, unsigned int *block)
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{
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int i;
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/* init the W0-W15 to the block of words being hashed. */
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/* step a) */
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for (i = 0; i < 16; i++) {
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ctx->words[i] = ntohl(block[i]);
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}
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/* now init the rest based on the SHA-1 formula, step b) */
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for (i = 16; i < 80; i++) {
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ctx->words[i] = CSHIFT(1, ((ctx->words[(i - 3)]) ^
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(ctx->words[(i - 8)]) ^
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(ctx->words[(i - 14)]) ^
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(ctx->words[(i - 16)])));
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}
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/* step c) */
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ctx->A = ctx->H0;
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ctx->B = ctx->H1;
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ctx->C = ctx->H2;
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ctx->D = ctx->H3;
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ctx->E = ctx->H4;
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/* step d) */
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for (i = 0; i < 80; i++) {
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if (i < 20) {
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ctx->TEMP = ((CSHIFT(5, ctx->A)) +
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(F1(ctx->B, ctx->C, ctx->D)) +
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(ctx->E) +
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ctx->words[i] +
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K1);
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} else if (i < 40) {
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ctx->TEMP = ((CSHIFT(5, ctx->A)) +
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(F2(ctx->B, ctx->C, ctx->D)) +
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(ctx->E) +
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(ctx->words[i]) +
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K2);
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} else if (i < 60) {
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ctx->TEMP = ((CSHIFT(5, ctx->A)) +
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(F3(ctx->B, ctx->C, ctx->D)) +
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(ctx->E) +
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(ctx->words[i]) +
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K3);
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} else {
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ctx->TEMP = ((CSHIFT(5, ctx->A)) +
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(F4(ctx->B, ctx->C, ctx->D)) +
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(ctx->E) +
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(ctx->words[i]) +
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K4);
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}
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ctx->E = ctx->D;
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ctx->D = ctx->C;
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ctx->C = CSHIFT(30, ctx->B);
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ctx->B = ctx->A;
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ctx->A = ctx->TEMP;
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}
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/* step e) */
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ctx->H0 = (ctx->H0) + (ctx->A);
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ctx->H1 = (ctx->H1) + (ctx->B);
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ctx->H2 = (ctx->H2) + (ctx->C);
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ctx->H3 = (ctx->H3) + (ctx->D);
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ctx->H4 = (ctx->H4) + (ctx->E);
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}
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void
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sctp_sha1_update(struct sctp_sha1_context *ctx, const unsigned char *ptr, unsigned int siz)
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{
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unsigned int number_left, left_to_fill;
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number_left = siz;
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while (number_left > 0) {
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left_to_fill = sizeof(ctx->sha_block) - ctx->how_many_in_block;
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if (left_to_fill > number_left) {
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/* can only partially fill up this one */
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memcpy(&ctx->sha_block[ctx->how_many_in_block],
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ptr, number_left);
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ctx->how_many_in_block += number_left;
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ctx->running_total += number_left;
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break;
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} else {
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/* block is now full, process it */
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memcpy(&ctx->sha_block[ctx->how_many_in_block],
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ptr, left_to_fill);
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sctp_sha1_process_a_block(ctx,
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(unsigned int *)ctx->sha_block);
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number_left -= left_to_fill;
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ctx->running_total += left_to_fill;
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ctx->how_many_in_block = 0;
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ptr = (const unsigned char *)(ptr + left_to_fill);
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}
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}
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}
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void
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sctp_sha1_final(unsigned char *digest, struct sctp_sha1_context *ctx)
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{
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/*
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* if any left in block fill with padding and process. Then transfer
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* the digest to the pointer. At the last block some special rules
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* need to apply. We must add a 1 bit following the message, then we
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* pad with 0's. The total size is encoded as a 64 bit number at the
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* end. Now if the last buffer has more than 55 octets in it we
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* cannot fit the 64 bit number + 10000000 pad on the end and must
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* add the 10000000 pad, pad the rest of the message with 0's and
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* then create an all 0 message with just the 64 bit size at the end
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* and run this block through by itself. Also the 64 bit int must
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* be in network byte order.
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*/
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int left_to_fill;
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unsigned int i, *ptr;
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if (ctx->how_many_in_block > 55) {
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/*
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* special case, we need to process two blocks here. One for
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* the current stuff plus possibly the pad. The other for
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* the size.
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*/
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left_to_fill = sizeof(ctx->sha_block) - ctx->how_many_in_block;
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if (left_to_fill == 0) {
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/* Should not really happen but I am paranoid */
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sctp_sha1_process_a_block(ctx,
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(unsigned int *)ctx->sha_block);
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/* init last block, a bit different than the rest */
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ctx->sha_block[0] = '\x80';
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for (i = 1; i < sizeof(ctx->sha_block); i++) {
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ctx->sha_block[i] = 0x0;
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}
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} else if (left_to_fill == 1) {
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ctx->sha_block[ctx->how_many_in_block] = '\x80';
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sctp_sha1_process_a_block(ctx,
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(unsigned int *)ctx->sha_block);
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/* init last block */
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memset(ctx->sha_block, 0, sizeof(ctx->sha_block));
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} else {
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ctx->sha_block[ctx->how_many_in_block] = '\x80';
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for (i = (ctx->how_many_in_block + 1);
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i < sizeof(ctx->sha_block);
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i++) {
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ctx->sha_block[i] = 0x0;
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}
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sctp_sha1_process_a_block(ctx,
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(unsigned int *)ctx->sha_block);
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/* init last block */
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memset(ctx->sha_block, 0, sizeof(ctx->sha_block));
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}
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/* This is in bits so multiply by 8 */
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ctx->running_total *= 8;
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ptr = (unsigned int *)&ctx->sha_block[60];
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*ptr = htonl(ctx->running_total);
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sctp_sha1_process_a_block(ctx, (unsigned int *)ctx->sha_block);
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} else {
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/*
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* easy case, we just pad this message to size - end with 0
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* add the magic 0x80 to the next word and then put the
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* network byte order size in the last spot and process the
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* block.
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*/
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ctx->sha_block[ctx->how_many_in_block] = '\x80';
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for (i = (ctx->how_many_in_block + 1);
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i < sizeof(ctx->sha_block);
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i++) {
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ctx->sha_block[i] = 0x0;
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}
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/* get last int spot */
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ctx->running_total *= 8;
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ptr = (unsigned int *)&ctx->sha_block[60];
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*ptr = htonl(ctx->running_total);
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sctp_sha1_process_a_block(ctx, (unsigned int *)ctx->sha_block);
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}
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/* transfer the digest back to the user */
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digest[3] = (ctx->H0 & 0xff);
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digest[2] = ((ctx->H0 >> 8) & 0xff);
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digest[1] = ((ctx->H0 >> 16) & 0xff);
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digest[0] = ((ctx->H0 >> 24) & 0xff);
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digest[7] = (ctx->H1 & 0xff);
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digest[6] = ((ctx->H1 >> 8) & 0xff);
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digest[5] = ((ctx->H1 >> 16) & 0xff);
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digest[4] = ((ctx->H1 >> 24) & 0xff);
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digest[11] = (ctx->H2 & 0xff);
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digest[10] = ((ctx->H2 >> 8) & 0xff);
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digest[9] = ((ctx->H2 >> 16) & 0xff);
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digest[8] = ((ctx->H2 >> 24) & 0xff);
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digest[15] = (ctx->H3 & 0xff);
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digest[14] = ((ctx->H3 >> 8) & 0xff);
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digest[13] = ((ctx->H3 >> 16) & 0xff);
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digest[12] = ((ctx->H3 >> 24) & 0xff);
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digest[19] = (ctx->H4 & 0xff);
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digest[18] = ((ctx->H4 >> 8) & 0xff);
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digest[17] = ((ctx->H4 >> 16) & 0xff);
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digest[16] = ((ctx->H4 >> 24) & 0xff);
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}
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#endif
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