2 * Copyright (C) 2012 Martin Storsjo
4 * This file is part of Libav.
6 * Libav 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.
11 * Libav 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.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 #include "attributes.h"
29 #define MAX_HASHLEN 32
30 #define MAX_BLOCKLEN 64
34 int blocklen, hashlen;
35 void (*final)(void*, uint8_t*);
36 void (*update)(void*, const uint8_t*, int len);
38 uint8_t key[MAX_BLOCKLEN];
42 #define DEFINE_SHA(bits) \
43 static av_cold void sha ## bits ##_init(void *ctx) \
45 av_sha_init(ctx, bits); \
52 AVHMAC *av_hmac_alloc(enum AVHMACType type)
54 AVHMAC *c = av_mallocz(sizeof(*c));
61 c->init = av_md5_init;
62 c->update = av_md5_update;
63 c->final = av_md5_final;
64 c->hash = av_md5_alloc();
69 c->init = sha160_init;
70 c->update = av_sha_update;
71 c->final = av_sha_final;
72 c->hash = av_sha_alloc();
77 c->init = sha224_init;
78 c->update = av_sha_update;
79 c->final = av_sha_final;
80 c->hash = av_sha_alloc();
85 c->init = sha256_init;
86 c->update = av_sha_update;
87 c->final = av_sha_final;
88 c->hash = av_sha_alloc();
101 void av_hmac_free(AVHMAC *c)
109 void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
112 uint8_t block[MAX_BLOCKLEN];
113 if (keylen > c->blocklen) {
115 c->update(c->hash, key, keylen);
116 c->final(c->hash, c->key);
117 c->keylen = c->hashlen;
119 memcpy(c->key, key, keylen);
123 for (i = 0; i < c->keylen; i++)
124 block[i] = c->key[i] ^ 0x36;
125 for (i = c->keylen; i < c->blocklen; i++)
127 c->update(c->hash, block, c->blocklen);
130 void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
132 c->update(c->hash, data, len);
135 int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
137 uint8_t block[MAX_BLOCKLEN];
139 if (outlen < c->hashlen)
140 return AVERROR(EINVAL);
141 c->final(c->hash, out);
143 for (i = 0; i < c->keylen; i++)
144 block[i] = c->key[i] ^ 0x5C;
145 for (i = c->keylen; i < c->blocklen; i++)
147 c->update(c->hash, block, c->blocklen);
148 c->update(c->hash, out, c->hashlen);
149 c->final(c->hash, out);
153 int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
154 const uint8_t *key, unsigned int keylen,
155 uint8_t *out, unsigned int outlen)
157 av_hmac_init(c, key, keylen);
158 av_hmac_update(c, data, len);
159 return av_hmac_final(c, out, outlen);