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  1. /*
  2.  * Copyright (C) 2013 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  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. #include <stdint.h>
  21. #include "hash.h"
  22.  
  23. #include "adler32.h"
  24. #include "crc.h"
  25. #include "md5.h"
  26. #include "murmur3.h"
  27. #include "ripemd.h"
  28. #include "sha.h"
  29. #include "sha512.h"
  30.  
  31. #include "avstring.h"
  32. #include "error.h"
  33. #include "intreadwrite.h"
  34. #include "mem.h"
  35.  
  36. enum hashtype {
  37.     MD5,
  38.     MURMUR3,
  39.     RIPEMD128,
  40.     RIPEMD160,
  41.     RIPEMD256,
  42.     RIPEMD320,
  43.     SHA160,
  44.     SHA224,
  45.     SHA256,
  46.     SHA512_224,
  47.     SHA512_256,
  48.     SHA384,
  49.     SHA512,
  50.     CRC32,
  51.     ADLER32,
  52.     NUM_HASHES
  53. };
  54.  
  55. typedef struct AVHashContext {
  56.     void *ctx;
  57.     enum hashtype type;
  58.     const AVCRC *crctab;
  59.     uint32_t crc;
  60. } AVHashContext;
  61.  
  62. struct {
  63.     const char *name;
  64.     int size;
  65. } hashdesc[] = {
  66.     [MD5]     = {"MD5",     16},
  67.     [MURMUR3] = {"murmur3", 16},
  68.     [RIPEMD128] = {"RIPEMD128", 16},
  69.     [RIPEMD160] = {"RIPEMD160", 20},
  70.     [RIPEMD256] = {"RIPEMD256", 32},
  71.     [RIPEMD320] = {"RIPEMD320", 40},
  72.     [SHA160]  = {"SHA160",  20},
  73.     [SHA224]  = {"SHA224",  28},
  74.     [SHA256]  = {"SHA256",  32},
  75.     [SHA512_224]  = {"SHA512/224",  28},
  76.     [SHA512_256]  = {"SHA512/256",  32},
  77.     [SHA384]  = {"SHA384",  48},
  78.     [SHA512]  = {"SHA512",  64},
  79.     [CRC32]   = {"CRC32",    4},
  80.     [ADLER32] = {"adler32",  4},
  81. };
  82.  
  83. const char *av_hash_names(int i)
  84. {
  85.     if (i < 0 || i >= NUM_HASHES) return NULL;
  86.     return hashdesc[i].name;
  87. }
  88.  
  89. const char *av_hash_get_name(const AVHashContext *ctx)
  90. {
  91.     return hashdesc[ctx->type].name;
  92. }
  93.  
  94. int av_hash_get_size(const AVHashContext *ctx)
  95. {
  96.     return hashdesc[ctx->type].size;
  97. }
  98.  
  99. int av_hash_alloc(AVHashContext **ctx, const char *name)
  100. {
  101.     AVHashContext *res;
  102.     int i;
  103.     *ctx = NULL;
  104.     for (i = 0; i < NUM_HASHES; i++)
  105.         if (av_strcasecmp(name, hashdesc[i].name) == 0)
  106.             break;
  107.     if (i >= NUM_HASHES) return AVERROR(EINVAL);
  108.     res = av_mallocz(sizeof(*res));
  109.     if (!res) return AVERROR(ENOMEM);
  110.     res->type = i;
  111.     switch (i) {
  112.     case MD5:     res->ctx = av_md5_alloc(); break;
  113.     case MURMUR3: res->ctx = av_murmur3_alloc(); break;
  114.     case RIPEMD128:
  115.     case RIPEMD160:
  116.     case RIPEMD256:
  117.     case RIPEMD320: res->ctx = av_ripemd_alloc(); break;
  118.     case SHA160:
  119.     case SHA224:
  120.     case SHA256:  res->ctx = av_sha_alloc(); break;
  121.     case SHA512_224:
  122.     case SHA512_256:
  123.     case SHA384:
  124.     case SHA512:  res->ctx = av_sha512_alloc(); break;
  125.     case CRC32:   res->crctab = av_crc_get_table(AV_CRC_32_IEEE_LE); break;
  126.     case ADLER32: break;
  127.     }
  128.     if (i != ADLER32 && i != CRC32 && !res->ctx) {
  129.         av_free(res);
  130.         return AVERROR(ENOMEM);
  131.     }
  132.     *ctx = res;
  133.     return 0;
  134. }
  135.  
  136. void av_hash_init(AVHashContext *ctx)
  137. {
  138.     switch (ctx->type) {
  139.     case MD5:     av_md5_init(ctx->ctx); break;
  140.     case MURMUR3: av_murmur3_init(ctx->ctx); break;
  141.     case RIPEMD128: av_ripemd_init(ctx->ctx, 128); break;
  142.     case RIPEMD160: av_ripemd_init(ctx->ctx, 160); break;
  143.     case RIPEMD256: av_ripemd_init(ctx->ctx, 256); break;
  144.     case RIPEMD320: av_ripemd_init(ctx->ctx, 320); break;
  145.     case SHA160:  av_sha_init(ctx->ctx, 160); break;
  146.     case SHA224:  av_sha_init(ctx->ctx, 224); break;
  147.     case SHA256:  av_sha_init(ctx->ctx, 256); break;
  148.     case SHA512_224:  av_sha512_init(ctx->ctx, 224); break;
  149.     case SHA512_256:  av_sha512_init(ctx->ctx, 256); break;
  150.     case SHA384:  av_sha512_init(ctx->ctx, 384); break;
  151.     case SHA512:  av_sha512_init(ctx->ctx, 512); break;
  152.     case CRC32:   ctx->crc = UINT32_MAX; break;
  153.     case ADLER32: ctx->crc = 1; break;
  154.     }
  155. }
  156.  
  157. void av_hash_update(AVHashContext *ctx, const uint8_t *src, int len)
  158. {
  159.     switch (ctx->type) {
  160.     case MD5:     av_md5_update(ctx->ctx, src, len); break;
  161.     case MURMUR3: av_murmur3_update(ctx->ctx, src, len); break;
  162.     case RIPEMD128:
  163.     case RIPEMD160:
  164.     case RIPEMD256:
  165.     case RIPEMD320: av_ripemd_update(ctx->ctx, src, len); break;
  166.     case SHA160:
  167.     case SHA224:
  168.     case SHA256:  av_sha_update(ctx->ctx, src, len); break;
  169.     case SHA512_224:
  170.     case SHA512_256:
  171.     case SHA384:
  172.     case SHA512:  av_sha512_update(ctx->ctx, src, len); break;
  173.     case CRC32:   ctx->crc = av_crc(ctx->crctab, ctx->crc, src, len); break;
  174.     case ADLER32: ctx->crc = av_adler32_update(ctx->crc, src, len); break;
  175.     }
  176. }
  177.  
  178. void av_hash_final(AVHashContext *ctx, uint8_t *dst)
  179. {
  180.     switch (ctx->type) {
  181.     case MD5:     av_md5_final(ctx->ctx, dst); break;
  182.     case MURMUR3: av_murmur3_final(ctx->ctx, dst); break;
  183.     case RIPEMD128:
  184.     case RIPEMD160:
  185.     case RIPEMD256:
  186.     case RIPEMD320: av_ripemd_final(ctx->ctx, dst); break;
  187.     case SHA160:
  188.     case SHA224:
  189.     case SHA256:  av_sha_final(ctx->ctx, dst); break;
  190.     case SHA512_224:
  191.     case SHA512_256:
  192.     case SHA384:
  193.     case SHA512:  av_sha512_final(ctx->ctx, dst); break;
  194.     case CRC32:   AV_WB32(dst, ctx->crc ^ UINT32_MAX); break;
  195.     case ADLER32: AV_WB32(dst, ctx->crc); break;
  196.     }
  197. }
  198.  
  199. void av_hash_freep(AVHashContext **ctx)
  200. {
  201.     if (*ctx)
  202.         av_freep(&(*ctx)->ctx);
  203.     av_freep(ctx);
  204. }
  205.