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  1. /*
  2.  * Copyright (C) 2012 Martin Storsjo
  3.  *
  4.  * This file is part of FFmpeg.
  5.  *
  6.  * FFmpeg is free software; you can redistribute it and/or
  7.  * modify it under the terms of the GNU Lesser General Public
  8.  * License as published by the Free Software Foundation; either
  9.  * version 2.1 of the License, or (at your option) any later version.
  10.  *
  11.  * FFmpeg is distributed in the hope that it will be useful,
  12.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14.  * Lesser General Public License for more details.
  15.  *
  16.  * You should have received a copy of the GNU Lesser General Public
  17.  * License along with FFmpeg; if not, write to the Free Software
  18.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19.  */
  20.  
  21. #include <string.h>
  22.  
  23. #include "attributes.h"
  24. #include "hmac.h"
  25. #include "md5.h"
  26. #include "sha.h"
  27. #include "sha512.h"
  28. #include "mem.h"
  29.  
  30. #define MAX_HASHLEN 64
  31. #define MAX_BLOCKLEN 128
  32.  
  33. struct AVHMAC {
  34.     void *hash;
  35.     int blocklen, hashlen;
  36.     void (*final)(void*, uint8_t*);
  37.     void (*update)(void*, const uint8_t*, int len);
  38.     void (*init)(void*);
  39.     uint8_t key[MAX_BLOCKLEN];
  40.     int keylen;
  41. };
  42.  
  43. #define DEFINE_SHA(bits)                           \
  44. static av_cold void sha ## bits ##_init(void *ctx) \
  45. {                                                  \
  46.     av_sha_init(ctx, bits);                        \
  47. }
  48.  
  49. #define DEFINE_SHA512(bits)                        \
  50. static av_cold void sha ## bits ##_init(void *ctx) \
  51. {                                                  \
  52.     av_sha512_init(ctx, bits);                     \
  53. }
  54.  
  55. DEFINE_SHA(160)
  56. DEFINE_SHA(224)
  57. DEFINE_SHA(256)
  58. DEFINE_SHA512(384)
  59. DEFINE_SHA512(512)
  60.  
  61. AVHMAC *av_hmac_alloc(enum AVHMACType type)
  62. {
  63.     AVHMAC *c = av_mallocz(sizeof(*c));
  64.     if (!c)
  65.         return NULL;
  66.     switch (type) {
  67.     case AV_HMAC_MD5:
  68.         c->blocklen = 64;
  69.         c->hashlen  = 16;
  70.         c->init     = (void*)av_md5_init;
  71.         c->update   = (void*)av_md5_update;
  72.         c->final    = (void*)av_md5_final;
  73.         c->hash     = av_md5_alloc();
  74.         break;
  75.     case AV_HMAC_SHA1:
  76.         c->blocklen = 64;
  77.         c->hashlen  = 20;
  78.         c->init     = sha160_init;
  79.         c->update   = (void*)av_sha_update;
  80.         c->final    = (void*)av_sha_final;
  81.         c->hash     = av_sha_alloc();
  82.         break;
  83.     case AV_HMAC_SHA224:
  84.         c->blocklen = 64;
  85.         c->hashlen  = 28;
  86.         c->init     = sha224_init;
  87.         c->update   = (void*)av_sha_update;
  88.         c->final    = (void*)av_sha_final;
  89.         c->hash     = av_sha_alloc();
  90.         break;
  91.     case AV_HMAC_SHA256:
  92.         c->blocklen = 64;
  93.         c->hashlen  = 32;
  94.         c->init     = sha256_init;
  95.         c->update   = (void*)av_sha_update;
  96.         c->final    = (void*)av_sha_final;
  97.         c->hash     = av_sha_alloc();
  98.         break;
  99.     case AV_HMAC_SHA384:
  100.         c->blocklen = 128;
  101.         c->hashlen  = 48;
  102.         c->init     = sha384_init;
  103.         c->update   = (void*)av_sha512_update;
  104.         c->final    = (void*)av_sha512_final;
  105.         c->hash     = av_sha512_alloc();
  106.         break;
  107.     case AV_HMAC_SHA512:
  108.         c->blocklen = 128;
  109.         c->hashlen  = 64;
  110.         c->init     = sha512_init;
  111.         c->update   = (void*)av_sha512_update;
  112.         c->final    = (void*)av_sha512_final;
  113.         c->hash     = av_sha512_alloc();
  114.         break;
  115.     default:
  116.         av_free(c);
  117.         return NULL;
  118.     }
  119.     if (!c->hash) {
  120.         av_free(c);
  121.         return NULL;
  122.     }
  123.     return c;
  124. }
  125.  
  126. void av_hmac_free(AVHMAC *c)
  127. {
  128.     if (!c)
  129.         return;
  130.     av_free(c->hash);
  131.     av_free(c);
  132. }
  133.  
  134. void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
  135. {
  136.     int i;
  137.     uint8_t block[MAX_BLOCKLEN];
  138.     if (keylen > c->blocklen) {
  139.         c->init(c->hash);
  140.         c->update(c->hash, key, keylen);
  141.         c->final(c->hash, c->key);
  142.         c->keylen = c->hashlen;
  143.     } else {
  144.         memcpy(c->key, key, keylen);
  145.         c->keylen = keylen;
  146.     }
  147.     c->init(c->hash);
  148.     for (i = 0; i < c->keylen; i++)
  149.         block[i] = c->key[i] ^ 0x36;
  150.     for (i = c->keylen; i < c->blocklen; i++)
  151.         block[i] = 0x36;
  152.     c->update(c->hash, block, c->blocklen);
  153. }
  154.  
  155. void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
  156. {
  157.     c->update(c->hash, data, len);
  158. }
  159.  
  160. int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
  161. {
  162.     uint8_t block[MAX_BLOCKLEN];
  163.     int i;
  164.     if (outlen < c->hashlen)
  165.         return AVERROR(EINVAL);
  166.     c->final(c->hash, out);
  167.     c->init(c->hash);
  168.     for (i = 0; i < c->keylen; i++)
  169.         block[i] = c->key[i] ^ 0x5C;
  170.     for (i = c->keylen; i < c->blocklen; i++)
  171.         block[i] = 0x5C;
  172.     c->update(c->hash, block, c->blocklen);
  173.     c->update(c->hash, out, c->hashlen);
  174.     c->final(c->hash, out);
  175.     return c->hashlen;
  176. }
  177.  
  178. int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
  179.                  const uint8_t *key, unsigned int keylen,
  180.                  uint8_t *out, unsigned int outlen)
  181. {
  182.     av_hmac_init(c, key, keylen);
  183.     av_hmac_update(c, data, len);
  184.     return av_hmac_final(c, out, outlen);
  185. }
  186.  
  187. #ifdef TEST
  188. #include <stdio.h>
  189.  
  190. static void test(AVHMAC *hmac, const uint8_t *key, int keylen,
  191.                  const uint8_t *data, int datalen)
  192. {
  193.     uint8_t buf[MAX_HASHLEN];
  194.     int out, i;
  195.     // Some of the test vectors are strings, where sizeof() includes the
  196.     // trailing null byte - remove that.
  197.     if (!key[keylen - 1])
  198.         keylen--;
  199.     if (!data[datalen - 1])
  200.         datalen--;
  201.     out = av_hmac_calc(hmac, data, datalen, key, keylen, buf, sizeof(buf));
  202.     for (i = 0; i < out; i++)
  203.         printf("%02x", buf[i]);
  204.     printf("\n");
  205. }
  206.  
  207. int main(void)
  208. {
  209.     uint8_t key1[20], key3[131], data3[50];
  210.     enum AVHMACType i = AV_HMAC_SHA224;
  211.     static const uint8_t key2[]  = "Jefe";
  212.     static const uint8_t data1[] = "Hi There";
  213.     static const uint8_t data2[] = "what do ya want for nothing?";
  214.     static const uint8_t data4[] = "Test Using Larger Than Block-Size Key - Hash Key First";
  215.     static const uint8_t data5[] = "Test Using Larger Than Block-Size Key and Larger Than One Block-Size Data";
  216.     static const uint8_t data6[] = "This is a test using a larger than block-size key and a larger "
  217.                             "than block-size data. The key needs to be hashed before being used"
  218.                             " by the HMAC algorithm.";
  219.     AVHMAC *hmac = av_hmac_alloc(AV_HMAC_MD5);
  220.     if (!hmac)
  221.         return 1;
  222.     memset(key1, 0x0b, sizeof(key1));
  223.     memset(key3, 0xaa, sizeof(key3));
  224.     memset(data3, 0xdd, sizeof(data3));
  225.     // RFC 2202 test vectors
  226.     test(hmac, key1, 16, data1, sizeof(data1));
  227.     test(hmac, key2, sizeof(key2), data2, sizeof(data2));
  228.     test(hmac, key3, 16, data3, sizeof(data3));
  229.     test(hmac, key3, 80, data4, sizeof(data4));
  230.     test(hmac, key3, 80, data5, sizeof(data5));
  231.     av_hmac_free(hmac);
  232.  
  233.     /* SHA-1 */
  234.     hmac = av_hmac_alloc(AV_HMAC_SHA1);
  235.     if (!hmac)
  236.         return 1;
  237.     // RFC 2202 test vectors
  238.     test(hmac, key1, sizeof(key1), data1, sizeof(data1));
  239.     test(hmac, key2, sizeof(key2), data2, sizeof(data2));
  240.     test(hmac, key3, 20, data3, sizeof(data3));
  241.     test(hmac, key3, 80, data4, sizeof(data4));
  242.     test(hmac, key3, 80, data5, sizeof(data5));
  243.     av_hmac_free(hmac);
  244.  
  245.     /* SHA-2 */
  246.     while (i <= AV_HMAC_SHA512) {
  247.         hmac = av_hmac_alloc(i);
  248.         // RFC 4231 test vectors
  249.         test(hmac, key1, sizeof(key1), data1, sizeof(data1));
  250.         test(hmac, key2, sizeof(key2), data2, sizeof(data2));
  251.         test(hmac, key3, 20, data3, sizeof(data3));
  252.         test(hmac, key3, sizeof(key3), data4, sizeof(data4));
  253.         test(hmac, key3, sizeof(key3), data6, sizeof(data6));
  254.         av_hmac_free(hmac);
  255.         i++;
  256.     }
  257.     return 0;
  258. }
  259. #endif /* TEST */
  260.