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