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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 4349 | Serge | 1 | /* |
| 2 | * RC4 encryption/decryption/pseudo-random number generator |
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| 3 | * |
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| 4 | * This file is part of FFmpeg. |
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| 5 | * |
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| 6 | * FFmpeg is free software; you can redistribute it and/or |
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| 7 | * modify it under the terms of the GNU Lesser General Public |
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| 8 | * License as published by the Free Software Foundation; either |
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| 9 | * version 2.1 of the License, or (at your option) any later version. |
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| 10 | * |
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| 11 | * FFmpeg is distributed in the hope that it will be useful, |
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| 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | * Lesser General Public License for more details. |
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| 15 | * |
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| 16 | * You should have received a copy of the GNU Lesser General Public |
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| 17 | * License along with FFmpeg; if not, write to the Free Software |
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| 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 19 | */ |
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| 20 | |||
| 21 | #ifndef AVUTIL_RC4_H |
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| 22 | #define AVUTIL_RC4_H |
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| 23 | |||
| 24 | #include |
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| 25 | |||
| 26 | struct AVRC4 { |
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| 27 | uint8_t state[256]; |
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| 28 | int x, y; |
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| 29 | }; |
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| 30 | |||
| 31 | /** |
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| 32 | * @brief Initializes an AVRC4 context. |
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| 33 | * |
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| 34 | * @param key_bits must be a multiple of 8 |
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| 35 | * @param decrypt 0 for encryption, 1 for decryption, currently has no effect |
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| 36 | */ |
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| 37 | int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt); |
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| 38 | |||
| 39 | /** |
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| 40 | * @brief Encrypts / decrypts using the RC4 algorithm. |
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| 41 | * |
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| 42 | * @param count number of bytes |
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| 43 | * @param dst destination array, can be equal to src |
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| 44 | * @param src source array, can be equal to dst, may be NULL |
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| 45 | * @param iv not (yet) used for RC4, should be NULL |
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| 46 | * @param decrypt 0 for encryption, 1 for decryption, not (yet) used |
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| 47 | */ |
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| 48 | void av_rc4_crypt(struct AVRC4 *d, uint8_t *dst, const uint8_t *src, int count, uint8_t *iv, int decrypt); |
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| 49 | |||
| 50 | #endif /* AVUTIL_RC4_H */ |