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https://github.com/FFmpeg/FFmpeg.git
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e7e0186eeb
* commit 'ab2ad8bd56882c0ea160b154e8b836eb71abc49d': lavf: Add functions for SRTP decryption/encryption lavu: Add an API for calculating HMAC (RFC 2104) Conflicts: doc/APIchanges libavutil/version.h Merged-by: Michael Niedermayer <michaelni@gmx.at>
139 lines
3.5 KiB
C
139 lines
3.5 KiB
C
/*
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* Copyright (C) 2012 Martin Storsjo
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <string.h>
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#include "hmac.h"
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#include "md5.h"
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#include "sha.h"
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#include "mem.h"
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#define MAX_HASHLEN 20
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#define MAX_BLOCKLEN 64
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struct AVHMAC {
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void *hash;
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int blocklen, hashlen;
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void (*final)(void*, uint8_t*);
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void (*update)(void*, const uint8_t*, int len);
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void (*init)(void*);
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uint8_t key[MAX_BLOCKLEN];
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int keylen;
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};
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static void sha1_init(void *ctx)
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{
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av_sha_init(ctx, 160);
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}
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AVHMAC *av_hmac_alloc(enum AVHMACType type)
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{
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AVHMAC *c = av_mallocz(sizeof(*c));
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if (!c)
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return NULL;
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switch (type) {
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case AV_HMAC_MD5:
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c->blocklen = 64;
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c->hashlen = 16;
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c->init = av_md5_init;
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c->update = av_md5_update;
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c->final = av_md5_final;
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c->hash = av_md5_alloc();
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break;
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case AV_HMAC_SHA1:
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c->blocklen = 64;
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c->hashlen = 20;
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c->init = sha1_init;
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c->update = av_sha_update;
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c->final = av_sha_final;
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c->hash = av_sha_alloc();
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break;
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default:
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av_free(c);
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return NULL;
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}
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if (!c->hash) {
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av_free(c);
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return NULL;
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}
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return c;
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}
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void av_hmac_free(AVHMAC *c)
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{
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if (!c)
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return;
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av_free(c->hash);
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av_free(c);
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}
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void av_hmac_init(AVHMAC *c, const uint8_t *key, unsigned int keylen)
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{
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int i;
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uint8_t block[MAX_BLOCKLEN];
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if (keylen > c->blocklen) {
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c->init(c->hash);
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c->update(c->hash, key, keylen);
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c->final(c->hash, c->key);
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c->keylen = c->hashlen;
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} else {
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memcpy(c->key, key, keylen);
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c->keylen = keylen;
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}
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c->init(c->hash);
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for (i = 0; i < c->keylen; i++)
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block[i] = c->key[i] ^ 0x36;
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for (i = c->keylen; i < c->blocklen; i++)
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block[i] = 0x36;
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c->update(c->hash, block, c->blocklen);
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}
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void av_hmac_update(AVHMAC *c, const uint8_t *data, unsigned int len)
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{
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c->update(c->hash, data, len);
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}
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int av_hmac_final(AVHMAC *c, uint8_t *out, unsigned int outlen)
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{
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uint8_t block[MAX_BLOCKLEN];
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int i;
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if (outlen < c->hashlen)
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return AVERROR(EINVAL);
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c->final(c->hash, out);
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c->init(c->hash);
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for (i = 0; i < c->keylen; i++)
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block[i] = c->key[i] ^ 0x5C;
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for (i = c->keylen; i < c->blocklen; i++)
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block[i] = 0x5C;
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c->update(c->hash, block, c->blocklen);
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c->update(c->hash, out, c->hashlen);
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c->final(c->hash, out);
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return c->hashlen;
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}
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int av_hmac_calc(AVHMAC *c, const uint8_t *data, unsigned int len,
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const uint8_t *key, unsigned int keylen,
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uint8_t *out, unsigned int outlen)
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{
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av_hmac_init(c, key, keylen);
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av_hmac_update(c, data, len);
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return av_hmac_final(c, out, outlen);
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}
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