mirror of https://github.com/Cisco-Talos/clamav
Steve Morgan
12 years ago
parent
6d3d543b21
commit
2f61f76313
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/* Crypto/Sha256.c -- SHA-256 Hash
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2010-06-11 : Igor Pavlov : Public domain |
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This code is based on public domain code from Wei Dai's Crypto++ library. */ |
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#include "RotateDefs.h" |
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#include "Sha256.h" |
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/* define it for speed optimization */ |
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/* #define _SHA256_UNROLL */ |
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/* #define _SHA256_UNROLL2 */ |
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void Sha256_Init(CSha256 *p) |
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{ |
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p->state[0] = 0x6a09e667; |
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p->state[1] = 0xbb67ae85; |
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p->state[2] = 0x3c6ef372; |
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p->state[3] = 0xa54ff53a; |
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p->state[4] = 0x510e527f; |
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p->state[5] = 0x9b05688c; |
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p->state[6] = 0x1f83d9ab; |
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p->state[7] = 0x5be0cd19; |
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p->count = 0; |
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} |
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#define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22)) |
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#define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25)) |
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#define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3)) |
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#define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10)) |
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#define blk0(i) (W[i] = data[i]) |
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#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15])) |
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#define Ch(x,y,z) (z^(x&(y^z))) |
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#define Maj(x,y,z) ((x&y)|(z&(x|y))) |
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#define a(i) T[(0-(i))&7] |
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#define b(i) T[(1-(i))&7] |
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#define c(i) T[(2-(i))&7] |
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#define d(i) T[(3-(i))&7] |
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#define e(i) T[(4-(i))&7] |
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#define f(i) T[(5-(i))&7] |
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#define g(i) T[(6-(i))&7] |
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#define h(i) T[(7-(i))&7] |
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#ifdef _SHA256_UNROLL2 |
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#define R(a,b,c,d,e,f,g,h, i) h += S1(e) + Ch(e,f,g) + K[i+j] + (j?blk2(i):blk0(i));\ |
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d += h; h += S0(a) + Maj(a, b, c) |
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#define RX_8(i) \ |
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R(a,b,c,d,e,f,g,h, i); \
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R(h,a,b,c,d,e,f,g, i+1); \
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R(g,h,a,b,c,d,e,f, i+2); \
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R(f,g,h,a,b,c,d,e, i+3); \
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R(e,f,g,h,a,b,c,d, i+4); \
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R(d,e,f,g,h,a,b,c, i+5); \
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R(c,d,e,f,g,h,a,b, i+6); \
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R(b,c,d,e,f,g,h,a, i+7) |
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#else |
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#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\ |
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d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) |
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#ifdef _SHA256_UNROLL |
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#define RX_8(i) R(i+0); R(i+1); R(i+2); R(i+3); R(i+4); R(i+5); R(i+6); R(i+7); |
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#endif |
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#endif |
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static const UInt32 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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}; |
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static void Sha256_Transform(UInt32 *state, const UInt32 *data) |
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{ |
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UInt32 W[16]; |
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unsigned j; |
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#ifdef _SHA256_UNROLL2 |
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UInt32 a,b,c,d,e,f,g,h; |
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a = state[0]; |
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b = state[1]; |
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c = state[2]; |
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d = state[3]; |
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e = state[4]; |
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f = state[5]; |
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g = state[6]; |
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h = state[7]; |
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#else |
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UInt32 T[8]; |
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for (j = 0; j < 8; j++) |
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T[j] = state[j]; |
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#endif |
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for (j = 0; j < 64; j += 16) |
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{ |
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#if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2) |
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RX_8(0); RX_8(8); |
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#else |
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unsigned i; |
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for (i = 0; i < 16; i++) { R(i); } |
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#endif |
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} |
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#ifdef _SHA256_UNROLL2 |
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state[0] += a; |
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state[1] += b; |
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state[2] += c; |
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state[3] += d; |
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state[4] += e; |
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state[5] += f; |
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state[6] += g; |
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state[7] += h; |
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#else |
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for (j = 0; j < 8; j++) |
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state[j] += T[j]; |
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#endif |
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/* Wipe variables */ |
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/* memset(W, 0, sizeof(W)); */ |
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/* memset(T, 0, sizeof(T)); */ |
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} |
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#undef S0 |
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#undef S1 |
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#undef s0 |
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#undef s1 |
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static void Sha256_WriteByteBlock(CSha256 *p) |
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{ |
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UInt32 data32[16]; |
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unsigned i; |
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for (i = 0; i < 16; i++) |
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data32[i] = |
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((UInt32)(p->buffer[i * 4 ]) << 24) + |
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((UInt32)(p->buffer[i * 4 + 1]) << 16) + |
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((UInt32)(p->buffer[i * 4 + 2]) << 8) + |
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((UInt32)(p->buffer[i * 4 + 3])); |
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Sha256_Transform(p->state, data32); |
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} |
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void Sha256_Update(CSha256 *p, const Byte *data, size_t size) |
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{ |
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UInt32 curBufferPos = (UInt32)p->count & 0x3F; |
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while (size > 0) |
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{ |
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p->buffer[curBufferPos++] = *data++; |
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p->count++; |
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size--; |
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if (curBufferPos == 64) |
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{ |
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curBufferPos = 0; |
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Sha256_WriteByteBlock(p); |
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} |
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} |
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} |
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void Sha256_Final(CSha256 *p, Byte *digest) |
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{ |
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UInt64 lenInBits = (p->count << 3); |
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UInt32 curBufferPos = (UInt32)p->count & 0x3F; |
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unsigned i; |
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p->buffer[curBufferPos++] = 0x80; |
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while (curBufferPos != (64 - 8)) |
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{ |
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curBufferPos &= 0x3F; |
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if (curBufferPos == 0) |
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Sha256_WriteByteBlock(p); |
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p->buffer[curBufferPos++] = 0; |
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} |
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for (i = 0; i < 8; i++) |
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{ |
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p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56); |
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lenInBits <<= 8; |
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} |
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Sha256_WriteByteBlock(p); |
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for (i = 0; i < 8; i++) |
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{ |
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*digest++ = (Byte)(p->state[i] >> 24); |
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*digest++ = (Byte)(p->state[i] >> 16); |
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*digest++ = (Byte)(p->state[i] >> 8); |
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*digest++ = (Byte)(p->state[i]); |
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} |
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Sha256_Init(p); |
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} |
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