mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-29 19:02:21 +00:00
5f84ad3ecc
* commit 'b864230c49089b087eef56988a3d6a784f6f9827': rtmp: Move RTMP digest calculation to a separate file Merged-by: James Almer <jamrial@gmail.com>
68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
/*
|
|
* RTMP network protocol
|
|
* Copyright (c) 2009 Konstantin Shishkov
|
|
*
|
|
* This file is part of FFmpeg.
|
|
*
|
|
* FFmpeg is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* FFmpeg is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with FFmpeg; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
|
|
/**
|
|
* @file
|
|
* RTMP protocol digest
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "libavutil/error.h"
|
|
#include "libavutil/hmac.h"
|
|
|
|
#include "rtmp.h"
|
|
|
|
int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap,
|
|
const uint8_t *key, int keylen, uint8_t *dst)
|
|
{
|
|
AVHMAC *hmac;
|
|
|
|
hmac = av_hmac_alloc(AV_HMAC_SHA256);
|
|
if (!hmac)
|
|
return AVERROR(ENOMEM);
|
|
|
|
av_hmac_init(hmac, key, keylen);
|
|
if (gap <= 0) {
|
|
av_hmac_update(hmac, src, len);
|
|
} else { //skip 32 bytes used for storing digest
|
|
av_hmac_update(hmac, src, gap);
|
|
av_hmac_update(hmac, src + gap + 32, len - gap - 32);
|
|
}
|
|
av_hmac_final(hmac, dst, 32);
|
|
|
|
av_hmac_free(hmac);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val,
|
|
int add_val)
|
|
{
|
|
int i, digest_pos = 0;
|
|
|
|
for (i = 0; i < 4; i++)
|
|
digest_pos += buf[i + off];
|
|
digest_pos = digest_pos % mod_val + add_val;
|
|
|
|
return digest_pos;
|
|
}
|