68 lines
1.8 KiB
C
68 lines
1.8 KiB
C
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/*
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* RTMP network protocol
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* Copyright (c) 2009 Konstantin Shishkov
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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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/**
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* @file
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* RTMP protocol digest
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*/
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#include <stdint.h>
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#include "libavutil/error.h"
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#include "libavutil/hmac.h"
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#include "rtmp.h"
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int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap,
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const uint8_t *key, int keylen, uint8_t *dst)
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{
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AVHMAC *hmac;
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hmac = av_hmac_alloc(AV_HMAC_SHA256);
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if (!hmac)
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return AVERROR(ENOMEM);
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av_hmac_init(hmac, key, keylen);
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if (gap <= 0) {
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av_hmac_update(hmac, src, len);
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} else { //skip 32 bytes used for storing digest
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av_hmac_update(hmac, src, gap);
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av_hmac_update(hmac, src + gap + 32, len - gap - 32);
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}
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av_hmac_final(hmac, dst, 32);
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av_hmac_free(hmac);
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return 0;
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}
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int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val,
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int add_val)
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{
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int i, digest_pos = 0;
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for (i = 0; i < 4; i++)
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digest_pos += buf[i + off];
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digest_pos = digest_pos % mod_val + add_val;
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return digest_pos;
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}
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