1 /* Crypto/Sha256.c -- SHA-256 Hash 2 2010-06-11 : Igor Pavlov : Public domain 3 This code is based on public domain code from Wei Dai's Crypto++ library. */ 4 5 #include "Precomp.h" 6 7 #include "RotateDefs.h" 8 #include "Sha256.h" 9 10 /* define it for speed optimization */ 11 /* #define _SHA256_UNROLL */ 12 /* #define _SHA256_UNROLL2 */ 13 14 void Sha256_Init(CSha256 *p) 15 { 16 p->state[0] = 0x6a09e667; 17 p->state[1] = 0xbb67ae85; 18 p->state[2] = 0x3c6ef372; 19 p->state[3] = 0xa54ff53a; 20 p->state[4] = 0x510e527f; 21 p->state[5] = 0x9b05688c; 22 p->state[6] = 0x1f83d9ab; 23 p->state[7] = 0x5be0cd19; 24 p->count = 0; 25 } 26 27 #define S0(x) (rotrFixed(x, 2) ^ rotrFixed(x,13) ^ rotrFixed(x, 22)) 28 #define S1(x) (rotrFixed(x, 6) ^ rotrFixed(x,11) ^ rotrFixed(x, 25)) 29 #define s0(x) (rotrFixed(x, 7) ^ rotrFixed(x,18) ^ (x >> 3)) 30 #define s1(x) (rotrFixed(x,17) ^ rotrFixed(x,19) ^ (x >> 10)) 31 32 #define blk0(i) (W[i] = data[i]) 33 #define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15])) 34 35 #define Ch(x,y,z) (z^(x&(y^z))) 36 #define Maj(x,y,z) ((x&y)|(z&(x|y))) 37 38 #define a(i) T[(0-(i))&7] 39 #define b(i) T[(1-(i))&7] 40 #define c(i) T[(2-(i))&7] 41 #define d(i) T[(3-(i))&7] 42 #define e(i) T[(4-(i))&7] 43 #define f(i) T[(5-(i))&7] 44 #define g(i) T[(6-(i))&7] 45 #define h(i) T[(7-(i))&7] 46 47 48 #ifdef _SHA256_UNROLL2 49 50 #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));\ 51 d += h; h += S0(a) + Maj(a, b, c) 52 53 #define RX_8(i) \ 54 R(a,b,c,d,e,f,g,h, i); \ 55 R(h,a,b,c,d,e,f,g, i+1); \ 56 R(g,h,a,b,c,d,e,f, i+2); \ 57 R(f,g,h,a,b,c,d,e, i+3); \ 58 R(e,f,g,h,a,b,c,d, i+4); \ 59 R(d,e,f,g,h,a,b,c, i+5); \ 60 R(c,d,e,f,g,h,a,b, i+6); \ 61 R(b,c,d,e,f,g,h,a, i+7) 62 63 #else 64 65 #define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\ 66 d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) 67 68 #ifdef _SHA256_UNROLL 69 70 #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); 71 72 #endif 73 74 #endif 75 76 static const UInt32 K[64] = { 77 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 78 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 79 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 80 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 81 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 82 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 83 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 84 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 85 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 86 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 87 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 88 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 89 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 90 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 91 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 92 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 93 }; 94 95 static void Sha256_Transform(UInt32 *state, const UInt32 *data) 96 { 97 UInt32 W[16]; 98 unsigned j; 99 #ifdef _SHA256_UNROLL2 100 UInt32 a,b,c,d,e,f,g,h; 101 a = state[0]; 102 b = state[1]; 103 c = state[2]; 104 d = state[3]; 105 e = state[4]; 106 f = state[5]; 107 g = state[6]; 108 h = state[7]; 109 #else 110 UInt32 T[8]; 111 for (j = 0; j < 8; j++) 112 T[j] = state[j]; 113 #endif 114 115 for (j = 0; j < 64; j += 16) 116 { 117 #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2) 118 RX_8(0); RX_8(8); 119 #else 120 unsigned i; 121 for (i = 0; i < 16; i++) { R(i); } 122 #endif 123 } 124 125 #ifdef _SHA256_UNROLL2 126 state[0] += a; 127 state[1] += b; 128 state[2] += c; 129 state[3] += d; 130 state[4] += e; 131 state[5] += f; 132 state[6] += g; 133 state[7] += h; 134 #else 135 for (j = 0; j < 8; j++) 136 state[j] += T[j]; 137 #endif 138 139 /* Wipe variables */ 140 /* memset(W, 0, sizeof(W)); */ 141 /* memset(T, 0, sizeof(T)); */ 142 } 143 144 #undef S0 145 #undef S1 146 #undef s0 147 #undef s1 148 149 static void Sha256_WriteByteBlock(CSha256 *p) 150 { 151 UInt32 data32[16]; 152 unsigned i; 153 for (i = 0; i < 16; i++) 154 data32[i] = 155 ((UInt32)(p->buffer[i * 4 ]) << 24) + 156 ((UInt32)(p->buffer[i * 4 + 1]) << 16) + 157 ((UInt32)(p->buffer[i * 4 + 2]) << 8) + 158 ((UInt32)(p->buffer[i * 4 + 3])); 159 Sha256_Transform(p->state, data32); 160 } 161 162 void Sha256_Update(CSha256 *p, const Byte *data, size_t size) 163 { 164 UInt32 curBufferPos = (UInt32)p->count & 0x3F; 165 while (size > 0) 166 { 167 p->buffer[curBufferPos++] = *data++; 168 p->count++; 169 size--; 170 if (curBufferPos == 64) 171 { 172 curBufferPos = 0; 173 Sha256_WriteByteBlock(p); 174 } 175 } 176 } 177 178 void Sha256_Final(CSha256 *p, Byte *digest) 179 { 180 UInt64 lenInBits = (p->count << 3); 181 UInt32 curBufferPos = (UInt32)p->count & 0x3F; 182 unsigned i; 183 p->buffer[curBufferPos++] = 0x80; 184 while (curBufferPos != (64 - 8)) 185 { 186 curBufferPos &= 0x3F; 187 if (curBufferPos == 0) 188 Sha256_WriteByteBlock(p); 189 p->buffer[curBufferPos++] = 0; 190 } 191 for (i = 0; i < 8; i++) 192 { 193 p->buffer[curBufferPos++] = (Byte)(lenInBits >> 56); 194 lenInBits <<= 8; 195 } 196 Sha256_WriteByteBlock(p); 197 198 for (i = 0; i < 8; i++) 199 { 200 *digest++ = (Byte)(p->state[i] >> 24); 201 *digest++ = (Byte)(p->state[i] >> 16); 202 *digest++ = (Byte)(p->state[i] >> 8); 203 *digest++ = (Byte)(p->state[i]); 204 } 205 Sha256_Init(p); 206 } 207
