/* sha256.c ** ** Copyright 2013, The Android Open Source Project ** ** 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 Google Inc. ``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 Google Inc. 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. */ // Optimized for minimal code size. #include "sha256.h" #include <stdio.h> #include <string.h> #include <stdint.h> #define ror(value, bits) (((value) >> (bits)) | ((value) << (32 - (bits)))) #define shr(value, bits) ((value) >> (bits)) static const uint32_t K[64] = { 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 }; static void SHA256_Transform(SHA256_CTX* ctx) { uint32_t W[64]; uint32_t A, B, C, D, E, F, G, H; uint8_t* p = ctx->buf; int t; for(t = 0; t < 16; ++t) { uint32_t tmp = *p++ << 24; tmp |= *p++ << 16; tmp |= *p++ << 8; tmp |= *p++; W[t] = tmp; } for(; t < 64; t++) { uint32_t s0 = ror(W[t-15], 7) ^ ror(W[t-15], 18) ^ shr(W[t-15], 3); uint32_t s1 = ror(W[t-2], 17) ^ ror(W[t-2], 19) ^ shr(W[t-2], 10); W[t] = W[t-16] + s0 + W[t-7] + s1; } A = ctx->state[0]; B = ctx->state[1]; C = ctx->state[2]; D = ctx->state[3]; E = ctx->state[4]; F = ctx->state[5]; G = ctx->state[6]; H = ctx->state[7]; for(t = 0; t < 64; t++) { uint32_t s0 = ror(A, 2) ^ ror(A, 13) ^ ror(A, 22); uint32_t maj = (A & B) ^ (A & C) ^ (B & C); uint32_t t2 = s0 + maj; uint32_t s1 = ror(E, 6) ^ ror(E, 11) ^ ror(E, 25); uint32_t ch = (E & F) ^ ((~E) & G); uint32_t t1 = H + s1 + ch + K[t] + W[t]; H = G; G = F; F = E; E = D + t1; D = C; C = B; B = A; A = t1 + t2; } ctx->state[0] += A; ctx->state[1] += B; ctx->state[2] += C; ctx->state[3] += D; ctx->state[4] += E; ctx->state[5] += F; ctx->state[6] += G; ctx->state[7] += H; } static const HASH_VTAB SHA256_VTAB = { SHA256_init, SHA256_update, SHA256_final, SHA256_hash, SHA256_DIGEST_SIZE }; void SHA256_init(SHA256_CTX* ctx) { ctx->f = &SHA256_VTAB; ctx->state[0] = 0x6a09e667; ctx->state[1] = 0xbb67ae85; ctx->state[2] = 0x3c6ef372; ctx->state[3] = 0xa54ff53a; ctx->state[4] = 0x510e527f; ctx->state[5] = 0x9b05688c; ctx->state[6] = 0x1f83d9ab; ctx->state[7] = 0x5be0cd19; ctx->count = 0; } void SHA256_update(SHA256_CTX* ctx, const void* data, int len) { int i = (int) (ctx->count & 63); const uint8_t* p = (const uint8_t*)data; ctx->count += len; while (len--) { ctx->buf[i++] = *p++; if (i == 64) { SHA256_Transform(ctx); i = 0; } } } const uint8_t* SHA256_final(SHA256_CTX* ctx) { uint8_t *p = ctx->buf; uint64_t cnt = ctx->count * 8; int i; SHA256_update(ctx, (uint8_t*)"\x80", 1); while ((ctx->count & 63) != 56) { SHA256_update(ctx, (uint8_t*)"\0", 1); } for (i = 0; i < 8; ++i) { uint8_t tmp = (uint8_t) (cnt >> ((7 - i) * 8)); SHA256_update(ctx, &tmp, 1); } for (i = 0; i < 8; i++) { uint32_t tmp = ctx->state[i]; *p++ = tmp >> 24; *p++ = tmp >> 16; *p++ = tmp >> 8; *p++ = tmp >> 0; } return ctx->buf; } /* Convenience function */ const uint8_t* SHA256_hash(const void* data, int len, uint8_t* digest) { SHA256_CTX ctx; SHA256_init(&ctx); SHA256_update(&ctx, data, len); memcpy(digest, SHA256_final(&ctx), SHA256_DIGEST_SIZE); return digest; }