sha512.c

   1 /*
   2  * Copyright (C) 2015 Felix Fietkau <nbd@openwrt.org>
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16
  17 /* SHA512
  18  * Daniel Beer <dlbeer@gmail.com>, 22 Apr 2014
  19  *
  20  * This file is in the public domain.
  21  */
  22
  23 #include "sha512.h"
  24
  25 static const uint64_t sha512_initial_state[8] = {
  26         0x6a09e667f3bcc908LL, 0xbb67ae8584caa73bLL,
  27         0x3c6ef372fe94f82bLL, 0xa54ff53a5f1d36f1LL,
  28         0x510e527fade682d1LL, 0x9b05688c2b3e6c1fLL,
  29         0x1f83d9abfb41bd6bLL, 0x5be0cd19137e2179LL,
  30 };
  31
  32 static const uint64_t round_k[80] = {
  33         0x428a2f98d728ae22LL, 0x7137449123ef65cdLL,
  34         0xb5c0fbcfec4d3b2fLL, 0xe9b5dba58189dbbcLL,
  35         0x3956c25bf348b538LL, 0x59f111f1b605d019LL,
  36         0x923f82a4af194f9bLL, 0xab1c5ed5da6d8118LL,
  37         0xd807aa98a3030242LL, 0x12835b0145706fbeLL,
  38         0x243185be4ee4b28cLL, 0x550c7dc3d5ffb4e2LL,
  39         0x72be5d74f27b896fLL, 0x80deb1fe3b1696b1LL,
  40         0x9bdc06a725c71235LL, 0xc19bf174cf692694LL,
  41         0xe49b69c19ef14ad2LL, 0xefbe4786384f25e3LL,
  42         0x0fc19dc68b8cd5b5LL, 0x240ca1cc77ac9c65LL,
  43         0x2de92c6f592b0275LL, 0x4a7484aa6ea6e483LL,
  44         0x5cb0a9dcbd41fbd4LL, 0x76f988da831153b5LL,
  45         0x983e5152ee66dfabLL, 0xa831c66d2db43210LL,
  46         0xb00327c898fb213fLL, 0xbf597fc7beef0ee4LL,
  47         0xc6e00bf33da88fc2LL, 0xd5a79147930aa725LL,
  48         0x06ca6351e003826fLL, 0x142929670a0e6e70LL,
  49         0x27b70a8546d22ffcLL, 0x2e1b21385c26c926LL,
  50         0x4d2c6dfc5ac42aedLL, 0x53380d139d95b3dfLL,
  51         0x650a73548baf63deLL, 0x766a0abb3c77b2a8LL,
  52         0x81c2c92e47edaee6LL, 0x92722c851482353bLL,
  53         0xa2bfe8a14cf10364LL, 0xa81a664bbc423001LL,
  54         0xc24b8b70d0f89791LL, 0xc76c51a30654be30LL,
  55         0xd192e819d6ef5218LL, 0xd69906245565a910LL,
  56         0xf40e35855771202aLL, 0x106aa07032bbd1b8LL,
  57         0x19a4c116b8d2d0c8LL, 0x1e376c085141ab53LL,
  58         0x2748774cdf8eeb99LL, 0x34b0bcb5e19b48a8LL,
  59         0x391c0cb3c5c95a63LL, 0x4ed8aa4ae3418acbLL,
  60         0x5b9cca4f7763e373LL, 0x682e6ff3d6b2b8a3LL,
  61         0x748f82ee5defb2fcLL, 0x78a5636f43172f60LL,
  62         0x84c87814a1f0ab72LL, 0x8cc702081a6439ecLL,
  63         0x90befffa23631e28LL, 0xa4506cebde82bde9LL,
  64         0xbef9a3f7b2c67915LL, 0xc67178f2e372532bLL,
  65         0xca273eceea26619cLL, 0xd186b8c721c0c207LL,
  66         0xeada7dd6cde0eb1eLL, 0xf57d4f7fee6ed178LL,
  67         0x06f067aa72176fbaLL, 0x0a637dc5a2c898a6LL,
  68         0x113f9804bef90daeLL, 0x1b710b35131c471bLL,
  69         0x28db77f523047d84LL, 0x32caab7b40c72493LL,
  70         0x3c9ebe0a15c9bebcLL, 0x431d67c49c100d4cLL,
  71         0x4cc5d4becb3e42b6LL, 0x597f299cfc657e2aLL,
  72         0x5fcb6fab3ad6faecLL, 0x6c44198c4a475817LL,
  73 };
  74
  75 static inline uint64_t load64(const uint8_t *x)
  76 {
  77         uint64_t r;
  78
  79         r = *(x++);
  80         r = (r << 8) | *(x++);
  81         r = (r << 8) | *(x++);
  82         r = (r << 8) | *(x++);
  83         r = (r << 8) | *(x++);
  84         r = (r << 8) | *(x++);
  85         r = (r << 8) | *(x++);
  86         r = (r << 8) | *(x++);
  87
  88         return r;
  89 }
  90
  91 static inline void store64(uint8_t *x, uint64_t v)
  92 {
  93         x += 7;
  94         *(x--) = v;
  95         v >>= 8;
  96         *(x--) = v;
  97         v >>= 8;
  98         *(x--) = v;
  99         v >>= 8;
 100         *(x--) = v;
 101         v >>= 8;
 102         *(x--) = v;
 103         v >>= 8;
 104         *(x--) = v;
 105         v >>= 8;
 106         *(x--) = v;
 107         v >>= 8;
 108         *(x--) = v;
 109 }
 110
 111 static inline uint64_t rot64(uint64_t x, int bits)
 112 {
 113         return (x >> bits) | (x << (64 - bits));
 114 }
 115
 116 static void
 117 sha512_block(struct sha512_state *s, const uint8_t *blk)
 118 {
 119         uint64_t w[16];
 120         uint64_t a, b, c, d, e, f, g, h;
 121         int i;
 122
 123         for (i = 0; i < 16; i++) {
 124                 w[i] = load64(blk);
 125                 blk += 8;
 126         }
 127
 128         /* Load state */
 129         a = s->h[0];
 130         b = s->h[1];
 131         c = s->h[2];
 132         d = s->h[3];
 133         e = s->h[4];
 134         f = s->h[5];
 135         g = s->h[6];
 136         h = s->h[7];
 137
 138         for (i = 0; i < 80; i++) {
 139                 /* Compute value of w[i + 16]. w[wrap(i)] is currently w[i] */
 140                 const uint64_t wi = w[i & 15];
 141                 const uint64_t wi15 = w[(i + 1) & 15];
 142                 const uint64_t wi2 = w[(i + 14) & 15];
 143                 const uint64_t wi7 = w[(i + 9) & 15];
 144                 const uint64_t s0 =
 145                         rot64(wi15, 1) ^ rot64(wi15, 8) ^ (wi15 >> 7);
 146                 const uint64_t s1 =
 147                         rot64(wi2, 19) ^ rot64(wi2, 61) ^ (wi2 >> 6);
 148
 149                 /* Round calculations */
 150                 const uint64_t S0 = rot64(a, 28) ^ rot64(a, 34) ^ rot64(a, 39);
 151                 const uint64_t S1 = rot64(e, 14) ^ rot64(e, 18) ^ rot64(e, 41);
 152                 const uint64_t ch = (e & f) ^ ((~e) & g);
 153                 const uint64_t temp1 = h + S1 + ch + round_k[i] + wi;
 154                 const uint64_t maj = (a & b) ^ (a & c) ^ (b & c);
 155                 const uint64_t temp2 = S0 + maj;
 156
 157                 /* Update round state */
 158                 h = g;
 159                 g = f;
 160                 f = e;
 161                 e = d + temp1;
 162                 d = c;
 163                 c = b;
 164                 b = a;
 165                 a = temp1 + temp2;
 166
 167                 /* w[wrap(i)] becomes w[i + 16] */
 168                 w[i & 15] = wi + s0 + wi7 + s1;
 169         }
 170
 171         /* Store state */
 172         s->h[0] += a;
 173         s->h[1] += b;
 174         s->h[2] += c;
 175         s->h[3] += d;
 176         s->h[4] += e;
 177         s->h[5] += f;
 178         s->h[6] += g;
 179         s->h[7] += h;
 180 }
 181
 182 void sha512_init(struct sha512_state *s)
 183 {
 184         memcpy(s->h, &sha512_initial_state, sizeof(s->h));
 185         s->len = 0;
 186 }
 187
 188 void sha512_add(struct sha512_state *s, const void *data, size_t len)
 189 {
 190         unsigned int partial = s->len & (SHA512_BLOCK_SIZE - 1);
 191
 192         if (partial) {
 193                 unsigned int cur = SHA512_BLOCK_SIZE - partial;
 194
 195                 if (cur > len)
 196                         cur = len;
 197
 198                 memcpy(&s->partial[partial], data, cur);
 199
 200                 s->len += cur;
 201                 data += cur;
 202                 len -= cur;
 203
 204                 partial = s->len & (SHA512_BLOCK_SIZE - 1);
 205                 if (!partial)
 206                         sha512_block(s, s->partial);
 207         }
 208
 209         while (len >= SHA512_BLOCK_SIZE) {
 210                 sha512_block(s, data);
 211
 212                 s->len += SHA512_BLOCK_SIZE;
 213                 data += SHA512_BLOCK_SIZE;
 214                 len -= SHA512_BLOCK_SIZE;
 215         }
 216
 217         if (!len)
 218                 return;
 219
 220         memcpy(s->partial, data, len);
 221         s->len += len;
 222 }
 223
 224 void sha512_final(struct sha512_state *s, uint8_t *hash)
 225 {
 226         size_t last_size = s->len & (SHA512_BLOCK_SIZE - 1);
 227         unsigned int len = SHA512_HASH_SIZE;
 228         int i = 0;
 229
 230         s->partial[last_size++] = 0x80;
 231         if (last_size < SHA512_BLOCK_SIZE)
 232                 memset(&s->partial[last_size], 0,
 233                        SHA512_BLOCK_SIZE - last_size);
 234
 235         if (last_size > 110) {
 236                 sha512_block(s, s->partial);
 237                 memset(s->partial, 0, sizeof(s->partial));
 238         }
 239
 240         /* Note: we assume total_size fits in 61 bits */
 241         store64(s->partial + SHA512_BLOCK_SIZE - 8, s->len << 3);
 242         sha512_block(s, s->partial);
 243
 244         /* Read out whole words */
 245         while (len >= 8) {
 246                 store64(hash, s->h[i++]);
 247                 hash += 8;
 248                 len -= 8;
 249         }
 250
 251         /* Read out bytes */
 252         if (len) {
 253                 uint8_t tmp[8];
 254
 255                 store64(tmp, s->h[i]);
 256                 memcpy(hash, tmp, len);
 257         }
 258 }