mirror of
https://github.com/trezor/trezor-firmware.git
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185 lines
5.5 KiB
C
185 lines
5.5 KiB
C
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/* sha256.c
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**
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** Copyright 2013, 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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// Optimized for minimal code size.
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#include "sha256.h"
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#include <stdio.h>
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#include <string.h>
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#include <stdint.h>
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#define ror(value, bits) (((value) >> (bits)) | ((value) << (32 - (bits))))
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#define shr(value, bits) ((value) >> (bits))
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static const uint32_t K[64] = {
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0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
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0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
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0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
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0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
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0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
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0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
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0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
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0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
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0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
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0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
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0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
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0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
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0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
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0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
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0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
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0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 };
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static void SHA256_Transform(SHA256_CTX* ctx) {
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uint32_t W[64];
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uint32_t A, B, C, D, E, F, G, H;
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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 < 64; t++) {
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uint32_t s0 = ror(W[t-15], 7) ^ ror(W[t-15], 18) ^ shr(W[t-15], 3);
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uint32_t s1 = ror(W[t-2], 17) ^ ror(W[t-2], 19) ^ shr(W[t-2], 10);
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W[t] = W[t-16] + s0 + W[t-7] + s1;
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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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F = ctx->state[5];
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G = ctx->state[6];
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H = ctx->state[7];
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for(t = 0; t < 64; t++) {
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uint32_t s0 = ror(A, 2) ^ ror(A, 13) ^ ror(A, 22);
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uint32_t maj = (A & B) ^ (A & C) ^ (B & C);
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uint32_t t2 = s0 + maj;
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uint32_t s1 = ror(E, 6) ^ ror(E, 11) ^ ror(E, 25);
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uint32_t ch = (E & F) ^ ((~E) & G);
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uint32_t t1 = H + s1 + ch + K[t] + W[t];
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H = G;
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G = F;
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F = E;
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E = D + t1;
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D = C;
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C = B;
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B = A;
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A = t1 + t2;
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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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ctx->state[5] += F;
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ctx->state[6] += G;
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ctx->state[7] += H;
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}
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static const HASH_VTAB SHA256_VTAB = {
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SHA256_init,
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SHA256_update,
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SHA256_final,
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SHA256_hash,
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SHA256_DIGEST_SIZE
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};
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void SHA256_init(SHA256_CTX* ctx) {
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ctx->f = &SHA256_VTAB;
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ctx->state[0] = 0x6a09e667;
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ctx->state[1] = 0xbb67ae85;
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ctx->state[2] = 0x3c6ef372;
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ctx->state[3] = 0xa54ff53a;
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ctx->state[4] = 0x510e527f;
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ctx->state[5] = 0x9b05688c;
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ctx->state[6] = 0x1f83d9ab;
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ctx->state[7] = 0x5be0cd19;
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ctx->count = 0;
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}
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void SHA256_update(SHA256_CTX* ctx, const void* data, int len) {
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int i = (int) (ctx->count & 63);
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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 == 64) {
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SHA256_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* SHA256_final(SHA256_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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SHA256_update(ctx, (uint8_t*)"\x80", 1);
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while ((ctx->count & 63) != 56) {
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SHA256_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 = (uint8_t) (cnt >> ((7 - i) * 8));
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SHA256_update(ctx, &tmp, 1);
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}
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for (i = 0; i < 8; 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* SHA256_hash(const void* data, int len, uint8_t* digest) {
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SHA256_CTX ctx;
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SHA256_init(&ctx);
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SHA256_update(&ctx, data, len);
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memcpy(digest, SHA256_final(&ctx), SHA256_DIGEST_SIZE);
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return digest;
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}
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