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67 lines
1.8 KiB
67 lines
1.8 KiB
/* |
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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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