libavutil/sha.c

   1 /*
   2  * Copyright (C) 2007 Michael Niedermayer <michaelni@gmx.at>
   3  * Copyright (C) 2009 Konstantin Shishkov
   4  * based on public domain SHA-1 code by Steve Reid <steve@edmweb.com>
   5  * and on BSD-licensed SHA-2 code by Aaron D. Gifford
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "common.h"
  25 #include "avutil.h"
  26 #include "bswap.h"
  27 #include "sha.h"
  28
  29 /** hash context */
  30 typedef struct AVSHA {
  31     uint8_t  digest_len;  ///< digest length in 32-bit words
  32     uint64_t count;       ///< number of bytes in buffer
  33     uint8_t  buffer[64];  ///< 512-bit buffer of input values used in hash updating
  34     uint32_t state[8];    ///< current hash value
  35     /** function used to update hash for 512-bit input block */
  36     void     (*transform)(uint32_t *state, const uint8_t buffer[64]);
  37 } AVSHA;
  38
  39 const int av_sha_size = sizeof(AVSHA);
  40
  41 #define rol(value, bits) (((value) << (bits)) | ((value) >> (32 - (bits))))
  42
  43 /* (R0+R1), R2, R3, R4 are the different operations used in SHA1 */
  44 #define blk0(i) (block[i] = be2me_32(((const uint32_t*)buffer)[i]))
  45 #define blk(i)  (block[i] = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1))
  46
  47 #define R0(v,w,x,y,z,i) z += ((w&(x^y))^y)     + blk0(i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
  48 #define R1(v,w,x,y,z,i) z += ((w&(x^y))^y)     + blk (i) + 0x5A827999 + rol(v, 5); w = rol(w, 30);
  49 #define R2(v,w,x,y,z,i) z += ( w^x     ^y)     + blk (i) + 0x6ED9EBA1 + rol(v, 5); w = rol(w, 30);
  50 #define R3(v,w,x,y,z,i) z += (((w|x)&y)|(w&x)) + blk (i) + 0x8F1BBCDC + rol(v, 5); w = rol(w, 30);
  51 #define R4(v,w,x,y,z,i) z += ( w^x     ^y)     + blk (i) + 0xCA62C1D6 + rol(v, 5); w = rol(w, 30);
  52
  53 /* Hash a single 512-bit block. This is the core of the algorithm. */
  54
  55 static void sha1_transform(uint32_t state[5], const uint8_t buffer[64])
  56 {
  57     uint32_t block[80];
  58     unsigned int i, a, b, c, d, e;
  59
  60     a = state[0];
  61     b = state[1];
  62     c = state[2];
  63     d = state[3];
  64     e = state[4];
  65 #if CONFIG_SMALL
  66     for (i = 0; i < 80; i++) {
  67         int t;
  68         if (i < 16)
  69             t = be2me_32(((uint32_t*)buffer)[i]);
  70         else
  71             t = rol(block[i-3] ^ block[i-8] ^ block[i-14] ^ block[i-16], 1);
  72         block[i] = t;
  73         t += e + rol(a, 5);
  74         if (i < 40) {
  75             if (i < 20)
  76                 t += ((b&(c^d))^d)     + 0x5A827999;
  77             else
  78                 t += ( b^c     ^d)     + 0x6ED9EBA1;
  79         } else {
  80             if (i < 60)
  81                 t += (((b|c)&d)|(b&c)) + 0x8F1BBCDC;
  82             else
  83                 t += ( b^c     ^d)     + 0xCA62C1D6;
  84         }
  85         e = d;
  86         d = c;
  87         c = rol(b, 30);
  88         b = a;
  89         a = t;
  90     }
  91 #else
  92     for (i = 0; i < 15; i += 5) {
  93         R0(a, b, c, d, e, 0 + i);
  94         R0(e, a, b, c, d, 1 + i);
  95         R0(d, e, a, b, c, 2 + i);
  96         R0(c, d, e, a, b, 3 + i);
  97         R0(b, c, d, e, a, 4 + i);
  98     }
  99     R0(a, b, c, d, e, 15);
 100     R1(e, a, b, c, d, 16);
 101     R1(d, e, a, b, c, 17);
 102     R1(c, d, e, a, b, 18);
 103     R1(b, c, d, e, a, 19);
 104     for (i = 20; i < 40; i += 5) {
 105         R2(a, b, c, d, e, 0 + i);
 106         R2(e, a, b, c, d, 1 + i);
 107         R2(d, e, a, b, c, 2 + i);
 108         R2(c, d, e, a, b, 3 + i);
 109         R2(b, c, d, e, a, 4 + i);
 110     }
 111     for (; i < 60; i += 5) {
 112         R3(a, b, c, d, e, 0 + i);
 113         R3(e, a, b, c, d, 1 + i);
 114         R3(d, e, a, b, c, 2 + i);
 115         R3(c, d, e, a, b, 3 + i);
 116         R3(b, c, d, e, a, 4 + i);
 117     }
 118     for (; i < 80; i += 5) {
 119         R4(a, b, c, d, e, 0 + i);
 120         R4(e, a, b, c, d, 1 + i);
 121         R4(d, e, a, b, c, 2 + i);
 122         R4(c, d, e, a, b, 3 + i);
 123         R4(b, c, d, e, a, 4 + i);
 124     }
 125 #endif
 126     state[0] += a;
 127     state[1] += b;
 128     state[2] += c;
 129     state[3] += d;
 130     state[4] += e;
 131 }
 132
 133 static const uint32_t K256[64] = {
 134     0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
 135     0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
 136     0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
 137     0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
 138     0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
 139     0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
 140     0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
 141     0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
 142     0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
 143     0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
 144     0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
 145     0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
 146     0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
 147     0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
 148     0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
 149     0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
 150 };
 151
 152
 153 #define Ch(x,y,z)   (((x) & ((y) ^ (z))) ^ (z))
 154 #define Maj(x,y,z)  ((((x) | (y)) & (z)) | ((x) & (y)))
 155
 156 #define Sigma0_256(x)   (rol((x), 30) ^ rol((x), 19) ^ rol((x), 10))
 157 #define Sigma1_256(x)   (rol((x), 26) ^ rol((x), 21) ^ rol((x),  7))
 158 #define sigma0_256(x)   (rol((x), 25) ^ rol((x), 14) ^ ((x) >> 3))
 159 #define sigma1_256(x)   (rol((x), 15) ^ rol((x), 13) ^ ((x) >> 10))
 160
 161 #undef blk
 162 #define blk(i)  (block[i] = block[i - 16] + sigma0_256(block[i - 15]) + \
 163                             sigma1_256(block[i - 2]) + block[i - 7])
 164
 165 #define ROUND256(a,b,c,d,e,f,g,h)   \
 166     T1 += (h) + Sigma1_256(e) + Ch((e), (f), (g)) + K256[i]; \
 167     (d) += T1; \
 168     (h) = T1 + Sigma0_256(a) + Maj((a), (b), (c)); \
 169     i++
 170
 171 #define ROUND256_0_TO_15(a,b,c,d,e,f,g,h)   \
 172     T1 = blk0(i); \
 173     ROUND256(a,b,c,d,e,f,g,h)
 174
 175 #define ROUND256_16_TO_63(a,b,c,d,e,f,g,h)   \
 176     T1 = blk(i); \
 177     ROUND256(a,b,c,d,e,f,g,h)
 178
 179 static void sha256_transform(uint32_t *state, const uint8_t buffer[64])
 180 {
 181     unsigned int i, a, b, c, d, e, f, g, h;
 182     uint32_t block[64];
 183     uint32_t T1, av_unused(T2);
 184
 185     a = state[0];
 186     b = state[1];
 187     c = state[2];
 188     d = state[3];
 189     e = state[4];
 190     f = state[5];
 191     g = state[6];
 192     h = state[7];
 193 #if CONFIG_SMALL
 194     for (i = 0; i < 64; i++) {
 195         if (i < 16)
 196             T1 = blk0(i);
 197         else
 198             T1 = blk(i);
 199         T1 += h + Sigma1_256(e) + Ch(e, f, g) + K256[i];
 200         T2 = Sigma0_256(a) + Maj(a, b, c);
 201         h = g;
 202         g = f;
 203         f = e;
 204         e = d + T1;
 205         d = c;
 206         c = b;
 207         b = a;
 208         a = T1 + T2;
 209     }
 210 #else
 211     for (i = 0; i < 16;) {
 212         ROUND256_0_TO_15(a, b, c, d, e, f, g, h);
 213         ROUND256_0_TO_15(h, a, b, c, d, e, f, g);
 214         ROUND256_0_TO_15(g, h, a, b, c, d, e, f);
 215         ROUND256_0_TO_15(f, g, h, a, b, c, d, e);
 216         ROUND256_0_TO_15(e, f, g, h, a, b, c, d);
 217         ROUND256_0_TO_15(d, e, f, g, h, a, b, c);
 218         ROUND256_0_TO_15(c, d, e, f, g, h, a, b);
 219         ROUND256_0_TO_15(b, c, d, e, f, g, h, a);
 220     }
 221
 222     for (; i < 64;) {
 223         ROUND256_16_TO_63(a, b, c, d, e, f, g, h);
 224         ROUND256_16_TO_63(h, a, b, c, d, e, f, g);
 225         ROUND256_16_TO_63(g, h, a, b, c, d, e, f);
 226         ROUND256_16_TO_63(f, g, h, a, b, c, d, e);
 227         ROUND256_16_TO_63(e, f, g, h, a, b, c, d);
 228         ROUND256_16_TO_63(d, e, f, g, h, a, b, c);
 229         ROUND256_16_TO_63(c, d, e, f, g, h, a, b);
 230         ROUND256_16_TO_63(b, c, d, e, f, g, h, a);
 231     }
 232 #endif
 233     state[0] += a;
 234     state[1] += b;
 235     state[2] += c;
 236     state[3] += d;
 237     state[4] += e;
 238     state[5] += f;
 239     state[6] += g;
 240     state[7] += h;
 241 }
 242
 243
 244 int av_sha_init(AVSHA* ctx, int bits)
 245 {
 246     ctx->digest_len = bits >> 5;
 247     switch (bits) {
 248     case 160: // SHA-1
 249         ctx->state[0] = 0x67452301;
 250         ctx->state[1] = 0xEFCDAB89;
 251         ctx->state[2] = 0x98BADCFE;
 252         ctx->state[3] = 0x10325476;
 253         ctx->state[4] = 0xC3D2E1F0;
 254         ctx->transform = sha1_transform;
 255         break;
 256     case 224: // SHA-224
 257         ctx->state[0] = 0xC1059ED8;
 258         ctx->state[1] = 0x367CD507;
 259         ctx->state[2] = 0x3070DD17;
 260         ctx->state[3] = 0xF70E5939;
 261         ctx->state[4] = 0xFFC00B31;
 262         ctx->state[5] = 0x68581511;
 263         ctx->state[6] = 0x64F98FA7;
 264         ctx->state[7] = 0xBEFA4FA4;
 265         ctx->transform = sha256_transform;
 266         break;
 267     case 256: // SHA-256
 268         ctx->state[0] = 0x6A09E667;
 269         ctx->state[1] = 0xBB67AE85;
 270         ctx->state[2] = 0x3C6EF372;
 271         ctx->state[3] = 0xA54FF53A;
 272         ctx->state[4] = 0x510E527F;
 273         ctx->state[5] = 0x9B05688C;
 274         ctx->state[6] = 0x1F83D9AB;
 275         ctx->state[7] = 0x5BE0CD19;
 276         ctx->transform = sha256_transform;
 277         break;
 278     default:
 279         return -1;
 280     }
 281     ctx->count = 0;
 282     return 0;
 283 }
 284
 285 void av_sha_update(AVSHA* ctx, const uint8_t* data, unsigned int len)
 286 {
 287     unsigned int i, j;
 288
 289     j = ctx->count & 63;
 290     ctx->count += len;
 291 #if CONFIG_SMALL
 292     for (i = 0; i < len; i++) {
 293         ctx->buffer[j++] = data[i];
 294         if (64 == j) {
 295             ctx->transform(ctx->state, ctx->buffer);
 296             j = 0;
 297         }
 298     }
 299 #else
 300     if ((j + len) > 63) {
 301         memcpy(&ctx->buffer[j], data, (i = 64 - j));
 302         ctx->transform(ctx->state, ctx->buffer);
 303         for (; i + 63 < len; i += 64)
 304             ctx->transform(ctx->state, &data[i]);
 305         j = 0;
 306     } else
 307         i = 0;
 308     memcpy(&ctx->buffer[j], &data[i], len - i);
 309 #endif
 310 }
 311
 312 void av_sha_final(AVSHA* ctx, uint8_t *digest)
 313 {
 314     int i;
 315     uint64_t finalcount = be2me_64(ctx->count << 3);
 316
 317     av_sha_update(ctx, "\200", 1);
 318     while ((ctx->count & 63) != 56)
 319         av_sha_update(ctx, "", 1);
 320     av_sha_update(ctx, (uint8_t *)&finalcount, 8); /* Should cause a transform() */
 321     for (i = 0; i < ctx->digest_len; i++)
 322         ((uint32_t*)digest)[i] = be2me_32(ctx->state[i]);
 323 }
 324
 325 #if LIBAVUTIL_VERSION_MAJOR < 51
 326 struct AVSHA1 {
 327     AVSHA sha;
 328 };
 329
 330 const int av_sha1_size = sizeof(struct AVSHA1);
 331
 332 void av_sha1_init(struct AVSHA1* context)
 333 {
 334     av_sha_init(&context->sha, 160);
 335 }
 336
 337 void av_sha1_update(struct AVSHA1* context, const uint8_t* data, unsigned int len)
 338 {
 339     av_sha_update(&context->sha, data, len);
 340 }
 341
 342 void av_sha1_final(struct AVSHA1* context, uint8_t digest[20])
 343 {
 344     av_sha_final(&context->sha, digest);
 345 }
 346 #endif
 347
 348 #ifdef TEST
 349 #include <stdio.h>
 350 #undef printf
 351
 352 int main(void)
 353 {
 354     int i, j, k;
 355     AVSHA ctx;
 356     unsigned char digest[32];
 357     const int lengths[3] = { 160, 224, 256 };
 358
 359     for (j = 0; j < 3; j++) {
 360         printf("Testing SHA-%d\n", lengths[j]);
 361         for (k = 0; k < 3; k++) {
 362             av_sha_init(&ctx, lengths[j]);
 363             if (k == 0)
 364                 av_sha_update(&ctx, "abc", 3);
 365             else if (k == 1)
 366                 av_sha_update(&ctx, "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq", 56);
 367             else
 368                 for (i = 0; i < 1000*1000; i++)
 369                     av_sha_update(&ctx, "a", 1);
 370             av_sha_final(&ctx, digest);
 371             for (i = 0; i < lengths[j] >> 3; i++)
 372                 printf("%02X", digest[i]);
 373             putchar('\n');
 374         }
 375         switch (j) {
 376         case 0:
 377             //test vectors (from FIPS PUB 180-1)
 378             printf("A9993E36 4706816A BA3E2571 7850C26C 9CD0D89D\n"
 379                    "84983E44 1C3BD26E BAAE4AA1 F95129E5 E54670F1\n"
 380                    "34AA973C D4C4DAA4 F61EEB2B DBAD2731 6534016F\n");
 381             break;
 382         case 1:
 383             //test vectors (from FIPS PUB 180-2 Appendix A)
 384             printf("23097d22 3405d822 8642a477 bda255b3 2aadbce4 bda0b3f7 e36c9da7\n"
 385                    "75388b16 512776cc 5dba5da1 fd890150 b0c6455c b4f58b19 52522525\n"
 386                    "20794655 980c91d8 bbb4c1ea 97618a4b f03f4258 1948b2ee 4ee7ad67\n");
 387             break;
 388         case 2:
 389             //test vectors (from FIPS PUB 180-2)
 390             printf("ba7816bf 8f01cfea 414140de 5dae2223 b00361a3 96177a9c b410ff61 f20015ad\n"
 391                    "248d6a61 d20638b8 e5c02693 0c3e6039 a33ce459 64ff2167 f6ecedd4 19db06c1\n"
 392                    "cdc76e5c 9914fb92 81a1c7e2 84d73e67 f1809a48 a497200e 046d39cc c7112cd0\n");
 393             break;
 394         }
 395     }
 396
 397     return 0;
 398 }
 399 #endif