SHA512.c (6695B)
1 /* 2 * SHA-512 Implementation 3 * Uses 64-bit operations, optimized with compiler intrinsics 4 */ 5 6 #include <stdio.h> 7 #include <stdlib.h> 8 #include <string.h> 9 #include <stdint.h> 10 11 // SHA-512 context 12 typedef struct { 13 uint64_t state[8]; 14 uint64_t count[2]; 15 uint8_t buffer[128]; 16 } sha512_context; 17 18 // SHA-512 constants 19 static const uint64_t K[80] = { 20 0x428a2f98d728ae22ULL, 0x7137449123ef65cdULL, 0xb5c0fbcfec4d3b2fULL, 0xe9b5dba58189dbbcULL, 21 0x3956c25bf348b538ULL, 0x59f111f1b605d019ULL, 0x923f82a4af194f9bULL, 0xab1c5ed5da6d8118ULL, 22 0xd807aa98a3030242ULL, 0x12835b0145706fbeULL, 0x243185be4ee4b28cULL, 0x550c7dc3d5ffb4e2ULL, 23 0x72be5d74f27b896fULL, 0x80deb1fe3b1696b1ULL, 0x9bdc06a725c71235ULL, 0xc19bf174cf692694ULL, 24 0xe49b69c19ef14ad2ULL, 0xefbe4786384f25e3ULL, 0x0fc19dc68b8cd5b5ULL, 0x240ca1cc77ac9c65ULL, 25 0x2de92c6f592b0275ULL, 0x4a7484aa6ea6e483ULL, 0x5cb0a9dcbd41fbd4ULL, 0x76f988da831153b5ULL, 26 0x983e5152ee66dfabULL, 0xa831c66d2db43210ULL, 0xb00327c898fb213fULL, 0xbf597fc7beef0ee4ULL, 27 0xc6e00bf33da88fc2ULL, 0xd5a79147930aa725ULL, 0x06ca6351e003826fULL, 0x142929670a0e6e70ULL, 28 0x27b70a8546d22ffcULL, 0x2e1b21385c26c926ULL, 0x4d2c6dfc5ac42aedULL, 0x53380d139d95b3dfULL, 29 0x650a73548baf63deULL, 0x766a0abb3c77b2a8ULL, 0x81c2c92e47edaee6ULL, 0x92722c851482353bULL, 30 0xa2bfe8a14cf10364ULL, 0xa81a664bbc423001ULL, 0xc24b8b70d0f89791ULL, 0xc76c51a30654be30ULL, 31 0xd192e819d6ef5218ULL, 0xd69906245565a910ULL, 0xf40e35855771202aULL, 0x106aa07032bbd1b8ULL, 32 0x19a4c116b8d2d0c8ULL, 0x1e376c085141ab53ULL, 0x2748774cdf8eeb99ULL, 0x34b0bcb5e19b48a8ULL, 33 0x391c0cb3c5c95a63ULL, 0x4ed8aa4ae3418acbULL, 0x5b9cca4f7763e373ULL, 0x682e6ff3d6b2b8a3ULL, 34 0x748f82ee5defb2fcULL, 0x78a5636f43172f60ULL, 0x84c87814a1f0ab72ULL, 0x8cc702081a6439ecULL, 35 0x90befffa23631e28ULL, 0xa4506cebde82bde9ULL, 0xbef9a3f7b2c67915ULL, 0xc67178f2e372532bULL, 36 0xca273eceea26619cULL, 0xd186b8c721c0c207ULL, 0xeada7dd6cde0eb1eULL, 0xf57d4f7fee6ed178ULL, 37 0x06f067aa72176fbaULL, 0x0a637dc5a2c898a6ULL, 0x113f9804bef90daeULL, 0x1b710b35131c471bULL, 38 0x28db77f523047d84ULL, 0x32caab7b40c72493ULL, 0x3c9ebe0a15c9bebcULL, 0x431d67c49c100d4cULL, 39 0x4cc5d4becb3e42b6ULL, 0x597f299cfc657e2aULL, 0x5fcb6fab3ad6faecULL, 0x6c44198c4a475817ULL 40 }; 41 42 // Rotate right for 64-bit 43 #define ROTR64(x, n) (((x) >> (n)) | ((x) << (64 - (n)))) 44 #define SHR64(x, n) ((x) >> (n)) 45 46 // SHA-512 functions 47 #define CH64(x, y, z) (((x) & (y)) ^ (~(x) & (z))) 48 #define MAJ64(x, y, z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z))) 49 #define SIGMA0_512(x) (ROTR64(x, 28) ^ ROTR64(x, 34) ^ ROTR64(x, 39)) 50 #define SIGMA1_512(x) (ROTR64(x, 14) ^ ROTR64(x, 18) ^ ROTR64(x, 41)) 51 #define sigma0_512(x) (ROTR64(x, 1) ^ ROTR64(x, 8) ^ SHR64(x, 7)) 52 #define sigma1_512(x) (ROTR64(x, 19) ^ ROTR64(x, 61) ^ SHR64(x, 6)) 53 54 // SHA-512 transform 55 static void sha512_transform(uint64_t state[8], const uint8_t block[128]) { 56 uint64_t W[80]; 57 uint64_t a, b, c, d, e, f, g, h, t1, t2; 58 int i; 59 60 // Prepare message schedule 61 for (i = 0; i < 16; i++) { 62 W[i] = ((uint64_t)block[i * 8] << 56) | 63 ((uint64_t)block[i * 8 + 1] << 48) | 64 ((uint64_t)block[i * 8 + 2] << 40) | 65 ((uint64_t)block[i * 8 + 3] << 32) | 66 ((uint64_t)block[i * 8 + 4] << 24) | 67 ((uint64_t)block[i * 8 + 5] << 16) | 68 ((uint64_t)block[i * 8 + 6] << 8) | 69 ((uint64_t)block[i * 8 + 7]); 70 } 71 72 for (i = 16; i < 80; i++) { 73 W[i] = sigma1_512(W[i - 2]) + W[i - 7] + sigma0_512(W[i - 15]) + W[i - 16]; 74 } 75 76 // Initialize working variables 77 a = state[0]; b = state[1]; c = state[2]; d = state[3]; 78 e = state[4]; f = state[5]; g = state[6]; h = state[7]; 79 80 // Main loop 81 for (i = 0; i < 80; i++) { 82 t1 = h + SIGMA1_512(e) + CH64(e, f, g) + K[i] + W[i]; 83 t2 = SIGMA0_512(a) + MAJ64(a, b, c); 84 h = g; g = f; f = e; e = d + t1; 85 d = c; c = b; b = a; a = t1 + t2; 86 } 87 88 // Update state 89 state[0] += a; state[1] += b; state[2] += c; state[3] += d; 90 state[4] += e; state[5] += f; state[6] += g; state[7] += h; 91 } 92 93 // Initialize SHA-512 context 94 void sha512_init(sha512_context *ctx) { 95 ctx->state[0] = 0x6a09e667f3bcc908ULL; 96 ctx->state[1] = 0xbb67ae8584caa73bULL; 97 ctx->state[2] = 0x3c6ef372fe94f82bULL; 98 ctx->state[3] = 0xa54ff53a5f1d36f1ULL; 99 ctx->state[4] = 0x510e527fade682d1ULL; 100 ctx->state[5] = 0x9b05688c2b3e6c1fULL; 101 ctx->state[6] = 0x1f83d9abfb41bd6bULL; 102 ctx->state[7] = 0x5be0cd19137e2179ULL; 103 ctx->count[0] = 0; 104 ctx->count[1] = 0; 105 } 106 107 // Update SHA-512 with data 108 void sha512_update(sha512_context *ctx, const uint8_t *data, size_t len) { 109 size_t i, index, part_len; 110 111 index = (size_t)((ctx->count[0] >> 3) & 0x7F); 112 113 uint64_t bitlen = (uint64_t)len << 3; 114 if ((ctx->count[0] += bitlen) < bitlen) { 115 ctx->count[1]++; 116 } 117 ctx->count[1] += ((uint64_t)len >> 61); 118 119 part_len = 128 - index; 120 121 if (len >= part_len) { 122 memcpy(&ctx->buffer[index], data, part_len); 123 sha512_transform(ctx->state, ctx->buffer); 124 125 for (i = part_len; i + 127 < len; i += 128) { 126 sha512_transform(ctx->state, &data[i]); 127 } 128 index = 0; 129 } else { 130 i = 0; 131 } 132 133 memcpy(&ctx->buffer[index], &data[i], len - i); 134 } 135 136 // Finalize SHA-512 and produce digest 137 void sha512_final(sha512_context *ctx, uint8_t digest[64]) { 138 uint8_t bits[16]; 139 size_t index, pad_len; 140 141 // Encode bit count 142 for (int i = 0; i < 8; i++) { 143 bits[15 - i] = (uint8_t)(ctx->count[0] >> (i * 8)); 144 bits[7 - i] = (uint8_t)(ctx->count[1] >> (i * 8)); 145 } 146 147 // Pad 148 index = (size_t)((ctx->count[0] >> 3) & 0x7F); 149 pad_len = (index < 112) ? (112 - index) : (240 - index); 150 151 uint8_t padding[128]; 152 padding[0] = 0x80; 153 memset(padding + 1, 0, pad_len - 1); 154 155 sha512_update(ctx, padding, pad_len); 156 sha512_update(ctx, bits, 16); 157 158 // Store digest 159 for (int i = 0; i < 8; i++) { 160 digest[i * 8] = (uint8_t)(ctx->state[i] >> 56); 161 digest[i * 8 + 1] = (uint8_t)(ctx->state[i] >> 48); 162 digest[i * 8 + 2] = (uint8_t)(ctx->state[i] >> 40); 163 digest[i * 8 + 3] = (uint8_t)(ctx->state[i] >> 32); 164 digest[i * 8 + 4] = (uint8_t)(ctx->state[i] >> 24); 165 digest[i * 8 + 5] = (uint8_t)(ctx->state[i] >> 16); 166 digest[i * 8 + 6] = (uint8_t)(ctx->state[i] >> 8); 167 digest[i * 8 + 7] = (uint8_t)(ctx->state[i]); 168 } 169 } 170 171 // One-shot SHA-512 172 void sha512(const uint8_t *data, size_t len, uint8_t digest[64]) { 173 sha512_context ctx; 174 sha512_init(&ctx); 175 sha512_update(&ctx, data, len); 176 sha512_final(&ctx, digest); 177 }