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https://github.com/vgmstream/vgmstream.git
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67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
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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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#ifndef AVUTIL_RC4_H
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#define AVUTIL_RC4_H
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#include <stdint.h>
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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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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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* 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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* @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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* @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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#endif /* AVUTIL_RC4_H */
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