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| | | /* |
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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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| | | |
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| | | #ifndef AVUTIL_RC4_H |
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| | | #define AVUTIL_RC4_H |
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| | | |
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| | | #include <stdint.h> |
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| | | |
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| | | /** |
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| | | * @defgroup lavu_rc4 RC4 |
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| | | * @ingroup lavu_crypto |
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| | | * @{ |
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| | | */ |
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| | | |
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| | | typedef struct AVRC4 { |
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| | | uint8_t state[256]; |
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| | | int x, y; |
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| | | } AVRC4; |
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| | | |
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| | | /** |
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| | | * Allocate an AVRC4 context. |
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| | | */ |
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| | | AVRC4 *av_rc4_alloc(void); |
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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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| | | * @return zero on success, negative value otherwise |
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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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| | | /** |
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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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| | | |
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| | | /** |
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| | | * @} |
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| | | */ |
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| | | |
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| | | #endif /* AVUTIL_RC4_H */ |
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