blob: 6e093802e584183f8cbafb5593a630ca2e25b5f1 [file] [log] [blame]
 // Copyright 2008 Google Inc. All Rights Reserved. // Author: mschilder@google.com (Marius Schilder) // // Optimized for minimal code size. #include "sha.h" #define rol(bits, value) (((value) << (bits)) | ((value) >> (32 - (bits)))) static void SHA1_Transform(SHA_CTX* ctx) { uint32_t W[80]; uint32_t A, B, C, D, E; uint8_t* p = ctx->buf.b; 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 < 80; t++) { W[t] = rol(1,W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16]); } A = ctx->state[0]; B = ctx->state[1]; C = ctx->state[2]; D = ctx->state[3]; E = ctx->state[4]; for(t = 0; t < 80; t++) { uint32_t tmp = rol(5,A) + E + W[t]; if (t < 20) tmp += (D^(B&(C^D))) + 0x5A827999; else if ( t < 40) tmp += (B^C^D) + 0x6ED9EBA1; else if ( t < 60) tmp += ((B&C)|(D&(B|C))) + 0x8F1BBCDC; else tmp += (B^C^D) + 0xCA62C1D6; E = D; D = C; C = rol(30,B); B = A; A = tmp; } ctx->state[0] += A; ctx->state[1] += B; ctx->state[2] += C; ctx->state[3] += D; ctx->state[4] += E; } void SHA_init(SHA_CTX* ctx) { ctx->state[0] = 0x67452301; ctx->state[1] = 0xEFCDAB89; ctx->state[2] = 0x98BADCFE; ctx->state[3] = 0x10325476; ctx->state[4] = 0xC3D2E1F0; ctx->count = 0; } void SHA_update(SHA_CTX* ctx, const void* data, int len) { int i = ctx->count % sizeof(ctx->buf); const uint8_t* p = (const uint8_t*)data; ctx->count += len; while (len--) { ctx->buf.b[i++] = *p++; if (i == sizeof(ctx->buf)) { SHA1_Transform(ctx); i = 0; } } } const uint8_t* SHA_final(SHA_CTX* ctx) { uint8_t *p = ctx->buf.b; uint64_t cnt = ctx->count * 8; int i; SHA_update(ctx, (uint8_t*)"\x80", 1); while ((ctx->count % sizeof(ctx->buf)) != (sizeof(ctx->buf) - 8)) { SHA_update(ctx, (uint8_t*)"\0", 1); } for (i = 0; i < 8; ++i) { uint8_t tmp = cnt >> ((7 - i) * 8); SHA_update(ctx, &tmp, 1); } for (i = 0; i < 5; i++) { uint32_t tmp = ctx->state[i]; *p++ = tmp >> 24; *p++ = tmp >> 16; *p++ = tmp >> 8; *p++ = tmp >> 0; } return ctx->buf.b; } /* Convenience function */ const uint8_t* SHA(const void* data, int len, uint8_t* digest) { const uint8_t* p; int i; SHA_CTX ctx; SHA_init(&ctx); SHA_update(&ctx, data, len); p = SHA_final(&ctx); for (i = 0; i < SHA_DIGEST_SIZE; ++i) { digest[i] = *p++; } return digest; }