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50 lines
1.6 KiB
50 lines
1.6 KiB
/* |
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* RC4 encryption/decryption/pseudo-random number generator |
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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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#ifndef AVUTIL_RC4_H |
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#define AVUTIL_RC4_H |
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#include <stdint.h> |
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struct AVRC4 { |
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uint8_t state[256]; |
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int x, y; |
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}; |
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/** |
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* @brief Initializes an AVRC4 context. |
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* |
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* @param key_bits must be a multiple of 8 |
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* @param decrypt 0 for encryption, 1 for decryption, currently has no effect |
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*/ |
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int av_rc4_init(struct AVRC4 *d, const uint8_t *key, int key_bits, int decrypt); |
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/** |
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* @brief Encrypts / decrypts using the RC4 algorithm. |
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* |
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* @param count number of bytes |
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* @param dst destination array, can be equal to src |
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* @param src source array, can be equal to dst, may be NULL |
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* @param iv not (yet) used for RC4, should be NULL |
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* @param decrypt 0 for encryption, 1 for decryption, not (yet) used |
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*/ |
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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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#endif /* AVUTIL_RC4_H */
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