diff options
Diffstat (limited to 'libc/sha.c')
-rw-r--r-- | libc/sha.c | 123 |
1 files changed, 0 insertions, 123 deletions
diff --git a/libc/sha.c b/libc/sha.c deleted file mode 100644 index 6e09380..0000000 --- a/libc/sha.c +++ /dev/null @@ -1,123 +0,0 @@ -// 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; -} |