sha256.c (5276B)
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 "rotate-bits/rotate-bits.h" 6 #include "sha256.h" 7 8 /* define it for speed optimization */ 9 #define _SHA256_UNROLL 10 #define _SHA256_UNROLL2 11 12 void 13 sha256_init(sha256_t *p) 14 { 15 p->state[0] = 0x6a09e667; 16 p->state[1] = 0xbb67ae85; 17 p->state[2] = 0x3c6ef372; 18 p->state[3] = 0xa54ff53a; 19 p->state[4] = 0x510e527f; 20 p->state[5] = 0x9b05688c; 21 p->state[6] = 0x1f83d9ab; 22 p->state[7] = 0x5be0cd19; 23 p->count = 0; 24 } 25 26 #define S0(x) (ROTR32(x, 2) ^ ROTR32(x,13) ^ ROTR32(x, 22)) 27 #define S1(x) (ROTR32(x, 6) ^ ROTR32(x,11) ^ ROTR32(x, 25)) 28 #define s0(x) (ROTR32(x, 7) ^ ROTR32(x,18) ^ (x >> 3)) 29 #define s1(x) (ROTR32(x,17) ^ ROTR32(x,19) ^ (x >> 10)) 30 31 #define blk0(i) (W[i] = data[i]) 32 #define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15])) 33 34 #define Ch(x,y,z) (z^(x&(y^z))) 35 #define Maj(x,y,z) ((x&y)|(z&(x|y))) 36 37 #define a(i) T[(0-(i))&7] 38 #define b(i) T[(1-(i))&7] 39 #define c(i) T[(2-(i))&7] 40 #define d(i) T[(3-(i))&7] 41 #define e(i) T[(4-(i))&7] 42 #define f(i) T[(5-(i))&7] 43 #define g(i) T[(6-(i))&7] 44 #define h(i) T[(7-(i))&7] 45 46 47 #ifdef _SHA256_UNROLL2 48 49 #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));\ 50 d += h; h += S0(a) + Maj(a, b, c) 51 52 #define RX_8(i) \ 53 R(a,b,c,d,e,f,g,h, i); \ 54 R(h,a,b,c,d,e,f,g, (i+1)); \ 55 R(g,h,a,b,c,d,e,f, (i+2)); \ 56 R(f,g,h,a,b,c,d,e, (i+3)); \ 57 R(e,f,g,h,a,b,c,d, (i+4)); \ 58 R(d,e,f,g,h,a,b,c, (i+5)); \ 59 R(c,d,e,f,g,h,a,b, (i+6)); \ 60 R(b,c,d,e,f,g,h,a, (i+7)) 61 62 #else 63 64 #define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\ 65 d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i)) 66 67 #ifdef _SHA256_UNROLL 68 69 #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); 70 71 #endif 72 73 #endif 74 75 static const uint32_t K[64] = { 76 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 77 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5, 78 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3, 79 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 80 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc, 81 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da, 82 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 83 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967, 84 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13, 85 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 86 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3, 87 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070, 88 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 89 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3, 90 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208, 91 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2 92 }; 93 94 static void 95 sha256_transform(uint32_t *state, const uint32_t *data) 96 { 97 uint32_t W[16]; 98 unsigned j; 99 #ifdef _SHA256_UNROLL2 100 uint32_t 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 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 150 sha256_write_byte_block(sha256_t *p) 151 { 152 uint32_t data32[16]; 153 unsigned i; 154 for (i = 0; i < 16; i++) 155 data32[i] = 156 ((uint32_t)(p->buffer[i * 4 ]) << 24) + 157 ((uint32_t)(p->buffer[i * 4 + 1]) << 16) + 158 ((uint32_t)(p->buffer[i * 4 + 2]) << 8) + 159 ((uint32_t)(p->buffer[i * 4 + 3])); 160 sha256_transform(p->state, data32); 161 } 162 163 164 void 165 sha256_hash(unsigned char *buf, const unsigned char *data, size_t size) 166 { 167 sha256_t hash; 168 sha256_init(&hash); 169 sha256_update(&hash, data, size); 170 sha256_final(&hash, buf); 171 } 172 173 174 void 175 sha256_update(sha256_t *p, const unsigned char *data, size_t size) 176 { 177 uint32_t curBufferPos = (uint32_t)p->count & 0x3F; 178 while (size > 0) 179 { 180 p->buffer[curBufferPos++] = *data++; 181 p->count++; 182 size--; 183 if (curBufferPos == 64) 184 { 185 curBufferPos = 0; 186 sha256_write_byte_block(p); 187 } 188 } 189 } 190 191 192 void 193 sha256_final(sha256_t *p, unsigned char *digest) 194 { 195 uint64_t lenInBits = (p->count << 3); 196 uint32_t curBufferPos = (uint32_t)p->count & 0x3F; 197 unsigned i; 198 p->buffer[curBufferPos++] = 0x80; 199 while (curBufferPos != (64 - 8)) 200 { 201 curBufferPos &= 0x3F; 202 if (curBufferPos == 0) 203 sha256_write_byte_block(p); 204 p->buffer[curBufferPos++] = 0; 205 } 206 for (i = 0; i < 8; i++) 207 { 208 p->buffer[curBufferPos++] = (unsigned char)(lenInBits >> 56); 209 lenInBits <<= 8; 210 } 211 sha256_write_byte_block(p); 212 213 for (i = 0; i < 8; i++) 214 { 215 *digest++ = (unsigned char)(p->state[i] >> 24); 216 *digest++ = (unsigned char)(p->state[i] >> 16); 217 *digest++ = (unsigned char)(p->state[i] >> 8); 218 *digest++ = (unsigned char)(p->state[i]); 219 } 220 sha256_init(p); 221 }