142 lines
4.1 KiB
C
142 lines
4.1 KiB
C
/* sha.c
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**
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** Copyright 2008, The Android Open Source Project
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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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** * Redistributions of source code must retain the above copyright
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** notice, this list of conditions and the following disclaimer.
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** * Redistributions in binary form must reproduce the above copyright
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** notice, this list of conditions and the following disclaimer in the
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** documentation and/or other materials provided with the distribution.
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** * Neither the name of Google Inc. nor the names of its contributors may
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** be used to endorse or promote products derived from this software
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** without specific prior written permission.
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**
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** THIS SOFTWARE IS PROVIDED BY Google Inc. ``AS IS'' AND ANY EXPRESS OR
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** IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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** MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
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** EVENT SHALL Google Inc. BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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** PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
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** OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
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** WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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** OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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** ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "mincrypt/sha.h"
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#define rol(bits, value) (((value) << (bits)) | ((value) >> (32 - (bits))))
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static void SHA1_transform(SHA_CTX *ctx) {
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uint32_t W[80];
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uint32_t A, B, C, D, E;
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uint8_t *p = ctx->buf;
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int t;
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for(t = 0; t < 16; ++t) {
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uint32_t tmp = *p++ << 24;
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tmp |= *p++ << 16;
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tmp |= *p++ << 8;
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tmp |= *p++;
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W[t] = tmp;
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}
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for(; t < 80; t++) {
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W[t] = rol(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]);
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}
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A = ctx->state[0];
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B = ctx->state[1];
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C = ctx->state[2];
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D = ctx->state[3];
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E = ctx->state[4];
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for(t = 0; t < 80; t++) {
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uint32_t tmp = rol(5,A) + E + W[t];
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if (t < 20)
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tmp += (D^(B&(C^D))) + 0x5A827999;
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else if ( t < 40)
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tmp += (B^C^D) + 0x6ED9EBA1;
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else if ( t < 60)
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tmp += ((B&C)|(D&(B|C))) + 0x8F1BBCDC;
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else
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tmp += (B^C^D) + 0xCA62C1D6;
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E = D;
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D = C;
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C = rol(30,B);
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B = A;
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A = tmp;
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}
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ctx->state[0] += A;
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ctx->state[1] += B;
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ctx->state[2] += C;
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ctx->state[3] += D;
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ctx->state[4] += E;
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}
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void SHA_init(SHA_CTX *ctx) {
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ctx->state[0] = 0x67452301;
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ctx->state[1] = 0xEFCDAB89;
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ctx->state[2] = 0x98BADCFE;
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ctx->state[3] = 0x10325476;
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ctx->state[4] = 0xC3D2E1F0;
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ctx->count = 0;
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}
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void SHA_update(SHA_CTX *ctx, const void *data, int len) {
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int i = ctx->count % sizeof(ctx->buf);
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const uint8_t* p = (const uint8_t*)data;
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ctx->count += len;
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while (len--) {
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ctx->buf[i++] = *p++;
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if (i == sizeof(ctx->buf)) {
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SHA1_transform(ctx);
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i = 0;
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}
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}
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}
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const uint8_t *SHA_final(SHA_CTX *ctx) {
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uint8_t *p = ctx->buf;
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uint64_t cnt = ctx->count * 8;
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int i;
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SHA_update(ctx, (uint8_t*)"\x80", 1);
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while ((ctx->count % sizeof(ctx->buf)) != (sizeof(ctx->buf) - 8)) {
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SHA_update(ctx, (uint8_t*)"\0", 1);
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}
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for (i = 0; i < 8; ++i) {
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uint8_t tmp = cnt >> ((7 - i) * 8);
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SHA_update(ctx, &tmp, 1);
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}
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for (i = 0; i < 5; i++) {
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uint32_t tmp = ctx->state[i];
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*p++ = tmp >> 24;
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*p++ = tmp >> 16;
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*p++ = tmp >> 8;
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*p++ = tmp >> 0;
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}
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return ctx->buf;
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}
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/* Convenience function */
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const uint8_t* SHA(const void *data, int len, uint8_t *digest) {
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const uint8_t *p;
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int i;
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SHA_CTX ctx;
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SHA_init(&ctx);
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SHA_update(&ctx, data, len);
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p = SHA_final(&ctx);
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for (i = 0; i < SHA_DIGEST_SIZE; ++i) {
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digest[i] = *p++;
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}
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return digest;
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}
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