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author | Dees_Troy <dees_troy@teamw.in> | 2012-09-11 21:28:06 +0200 |
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committer | Dees_Troy <dees_troy@teamw.in> | 2012-09-12 21:14:38 +0200 |
commit | 32c8eb81af916f04fd42e7294f699b10474beef6 (patch) | |
tree | d845c9e6435c0b6f6b1e6bc490315600b20e72eb /twmincrypt/twsha.c | |
parent | Clean up extra-functions (diff) | |
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Diffstat (limited to 'twmincrypt/twsha.c')
-rw-r--r-- | twmincrypt/twsha.c | 307 |
1 files changed, 307 insertions, 0 deletions
diff --git a/twmincrypt/twsha.c b/twmincrypt/twsha.c new file mode 100644 index 000000000..ac712c245 --- /dev/null +++ b/twmincrypt/twsha.c @@ -0,0 +1,307 @@ +/* sha.c +** +** Copyright 2008, 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. +*/ + +#include "twsha.h" + +// Some machines lack byteswap.h and endian.h. These have to use the +// slower code, even if they're little-endian. + +#if defined(HAVE_ENDIAN_H) && defined(HAVE_LITTLE_ENDIAN) + +#include <byteswap.h> +#include <memory.h> + +// This version is about 28% faster than the generic version below, +// but assumes little-endianness. + +static inline uint32_t ror27(uint32_t val) { + return (val >> 27) | (val << 5); +} +static inline uint32_t ror2(uint32_t val) { + return (val >> 2) | (val << 30); +} +static inline uint32_t ror31(uint32_t val) { + return (val >> 31) | (val << 1); +} + +static void SHA1_Transform(SHA_CTX* ctx) { + uint32_t W[80]; + register uint32_t A, B, C, D, E; + int t; + + A = ctx->state[0]; + B = ctx->state[1]; + C = ctx->state[2]; + D = ctx->state[3]; + E = ctx->state[4]; + +#define SHA_F1(A,B,C,D,E,t) \ + E += ror27(A) + \ + (W[t] = bswap_32(ctx->buf.w[t])) + \ + (D^(B&(C^D))) + 0x5A827999; \ + B = ror2(B); + + for (t = 0; t < 15; t += 5) { + SHA_F1(A,B,C,D,E,t + 0); + SHA_F1(E,A,B,C,D,t + 1); + SHA_F1(D,E,A,B,C,t + 2); + SHA_F1(C,D,E,A,B,t + 3); + SHA_F1(B,C,D,E,A,t + 4); + } + SHA_F1(A,B,C,D,E,t + 0); // 16th one, t == 15 + +#undef SHA_F1 + +#define SHA_F1(A,B,C,D,E,t) \ + E += ror27(A) + \ + (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \ + (D^(B&(C^D))) + 0x5A827999; \ + B = ror2(B); + + SHA_F1(E,A,B,C,D,t + 1); + SHA_F1(D,E,A,B,C,t + 2); + SHA_F1(C,D,E,A,B,t + 3); + SHA_F1(B,C,D,E,A,t + 4); + +#undef SHA_F1 + +#define SHA_F2(A,B,C,D,E,t) \ + E += ror27(A) + \ + (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \ + (B^C^D) + 0x6ED9EBA1; \ + B = ror2(B); + + for (t = 20; t < 40; t += 5) { + SHA_F2(A,B,C,D,E,t + 0); + SHA_F2(E,A,B,C,D,t + 1); + SHA_F2(D,E,A,B,C,t + 2); + SHA_F2(C,D,E,A,B,t + 3); + SHA_F2(B,C,D,E,A,t + 4); + } + +#undef SHA_F2 + +#define SHA_F3(A,B,C,D,E,t) \ + E += ror27(A) + \ + (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \ + ((B&C)|(D&(B|C))) + 0x8F1BBCDC; \ + B = ror2(B); + + for (; t < 60; t += 5) { + SHA_F3(A,B,C,D,E,t + 0); + SHA_F3(E,A,B,C,D,t + 1); + SHA_F3(D,E,A,B,C,t + 2); + SHA_F3(C,D,E,A,B,t + 3); + SHA_F3(B,C,D,E,A,t + 4); + } + +#undef SHA_F3 + +#define SHA_F4(A,B,C,D,E,t) \ + E += ror27(A) + \ + (W[t] = ror31(W[t-3] ^ W[t-8] ^ W[t-14] ^ W[t-16])) + \ + (B^C^D) + 0xCA62C1D6; \ + B = ror2(B); + + for (; t < 80; t += 5) { + SHA_F4(A,B,C,D,E,t + 0); + SHA_F4(E,A,B,C,D,t + 1); + SHA_F4(D,E,A,B,C,t + 2); + SHA_F4(C,D,E,A,B,t + 3); + SHA_F4(B,C,D,E,A,t + 4); + } + +#undef SHA_F4 + + ctx->state[0] += A; + ctx->state[1] += B; + ctx->state[2] += C; + ctx->state[3] += D; + ctx->state[4] += E; +} + +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 > sizeof(ctx->buf) - i) { + memcpy(&ctx->buf.b[i], p, sizeof(ctx->buf) - i); + len -= sizeof(ctx->buf) - i; + p += sizeof(ctx->buf) - i; + SHA1_Transform(ctx); + i = 0; + } + + 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) { + 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++) { + ctx->buf.w[i] = bswap_32(ctx->state[i]); + } + + return ctx->buf.b; +} + +#else // #if defined(HAVE_ENDIAN_H) && defined(HAVE_LITTLE_ENDIAN) + +#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; + 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_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[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; + 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; +} + +#endif // endianness + +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; +} + +/* 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; +} |