2 * Copyright (C) 2012 Martin Storsjo
4 * This file is part of FFmpeg.
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.
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.
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
25 #include "attributes.h"
33 #define MAX_HASHLEN 64
34 #define MAX_BLOCKLEN 128
36 typedef void (*hmac_final)(void *ctx, uint8_t *dst);
37 typedef void (*hmac_update)(void *ctx, const uint8_t *src, size_t len);
38 typedef void (*hmac_init)(void *ctx);
42 int blocklen, hashlen;
46 uint8_t key[MAX_BLOCKLEN];
50 #define DEFINE_SHA(bits) \
51 static av_cold void sha ## bits ##_init(void *ctx) \
53 av_sha_init(ctx, bits); \
56 #define DEFINE_SHA512(bits) \
57 static av_cold void sha ## bits ##_init(void *ctx) \
59 av_sha512_init(ctx, bits); \
68 AVHMAC *av_hmac_alloc(enum AVHMACType type)
70 AVHMAC *c = av_mallocz(sizeof(*c));
77 c->init = (hmac_init) av_md5_init;
78 c->update = (hmac_update) av_md5_update;
79 c->final = (hmac_final) av_md5_final;
80 c->hash = av_md5_alloc();
85 c->init = sha160_init;
86 c->update = (hmac_update) av_sha_update;
87 c->final = (hmac_final) av_sha_final;
88 c->hash = av_sha_alloc();
93 c->init = sha224_init;
94 c->update = (hmac_update) av_sha_update;
95 c->final = (hmac_final) av_sha_final;
96 c->hash = av_sha_alloc();
101 c->init = sha256_init;
102 c->update = (hmac_update) av_sha_update;
103 c->final = (hmac_final) av_sha_final;
104 c->hash = av_sha_alloc();
109 c->init = sha384_init;
110 c->update = (hmac_update) av_sha512_update;
111 c->final = (hmac_final) av_sha512_final;
112 c->hash = av_sha512_alloc();
117 c->init = sha512_init;
118 c->update = (hmac_update) av_sha512_update;
119 c->final = (hmac_final) av_sha512_final;
120 c->hash = av_sha512_alloc();
133 void av_hmac_free(AVHMAC *c)
141 void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
144 uint8_t block[MAX_BLOCKLEN];
145 if (keylen > c->blocklen) {
147 c->update(c->hash, key, keylen);
148 c->final(c->hash, c->key);
149 c->keylen = c->hashlen;
151 memcpy(c->key, key, keylen);
155 for (i = 0; i < c->keylen; i++)
156 block[i] = c->key[i] ^ 0x36;
157 for (i = c->keylen; i < c->blocklen; i++)
159 c->update(c->hash, block, c->blocklen);
162 void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
164 c->update(c->hash, data, len);
167 int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
169 uint8_t block[MAX_BLOCKLEN];
171 if (outlen < c->hashlen)
172 return AVERROR(EINVAL);
173 c->final(c->hash, out);
175 for (i = 0; i < c->keylen; i++)
176 block[i] = c->key[i] ^ 0x5C;
177 for (i = c->keylen; i < c->blocklen; i++)
179 c->update(c->hash, block, c->blocklen);
180 c->update(c->hash, out, c->hashlen);
181 c->final(c->hash, out);
185 int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
186 const uint8_t *key, unsigned int keylen,
187 uint8_t *out, unsigned int outlen)
189 av_hmac_init(c, key, keylen);
190 av_hmac_update(c, data, len);
191 return av_hmac_final(c, out, outlen);