| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | /* | ||
| 2 | * RTMP network protocol | ||
| 3 | * Copyright (c) 2009 Konstantin Shishkov | ||
| 4 | * | ||
| 5 | * This file is part of FFmpeg. | ||
| 6 | * | ||
| 7 | * FFmpeg is free software; you can redistribute it and/or | ||
| 8 | * modify it under the terms of the GNU Lesser General Public | ||
| 9 | * License as published by the Free Software Foundation; either | ||
| 10 | * version 2.1 of the License, or (at your option) any later version. | ||
| 11 | * | ||
| 12 | * FFmpeg is distributed in the hope that it will be useful, | ||
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
| 15 | * Lesser General Public License for more details. | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU Lesser General Public | ||
| 18 | * License along with FFmpeg; if not, write to the Free Software | ||
| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA | ||
| 20 | */ | ||
| 21 | |||
| 22 | /** | ||
| 23 | * @file | ||
| 24 | * RTMP protocol digest | ||
| 25 | */ | ||
| 26 | |||
| 27 | #include <stdint.h> | ||
| 28 | |||
| 29 | #include "libavutil/error.h" | ||
| 30 | #include "libavutil/hmac.h" | ||
| 31 | |||
| 32 | #include "rtmp.h" | ||
| 33 | |||
| 34 | ✗ | int ff_rtmp_calc_digest(const uint8_t *src, int len, int gap, | |
| 35 | const uint8_t *key, int keylen, uint8_t *dst) | ||
| 36 | { | ||
| 37 | AVHMAC *hmac; | ||
| 38 | |||
| 39 | ✗ | hmac = av_hmac_alloc(AV_HMAC_SHA256); | |
| 40 | ✗ | if (!hmac) | |
| 41 | ✗ | return AVERROR(ENOMEM); | |
| 42 | |||
| 43 | ✗ | av_hmac_init(hmac, key, keylen); | |
| 44 | ✗ | if (gap <= 0) { | |
| 45 | ✗ | av_hmac_update(hmac, src, len); | |
| 46 | } else { //skip 32 bytes used for storing digest | ||
| 47 | ✗ | av_hmac_update(hmac, src, gap); | |
| 48 | ✗ | av_hmac_update(hmac, src + gap + 32, len - gap - 32); | |
| 49 | } | ||
| 50 | ✗ | av_hmac_final(hmac, dst, 32); | |
| 51 | |||
| 52 | ✗ | av_hmac_free(hmac); | |
| 53 | |||
| 54 | ✗ | return 0; | |
| 55 | } | ||
| 56 | |||
| 57 | ✗ | int ff_rtmp_calc_digest_pos(const uint8_t *buf, int off, int mod_val, | |
| 58 | int add_val) | ||
| 59 | { | ||
| 60 | ✗ | int i, digest_pos = 0; | |
| 61 | |||
| 62 | ✗ | for (i = 0; i < 4; i++) | |
| 63 | ✗ | digest_pos += buf[i + off]; | |
| 64 | ✗ | digest_pos = digest_pos % mod_val + add_val; | |
| 65 | |||
| 66 | ✗ | return digest_pos; | |
| 67 | } | ||
| 68 |