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3d1690b8c6
It's been argued that the benefits of the current implementation far outweight those of making the structs opaque. This deprecation is not present in any release, so it can be safely removed. Reviewed-by: Ronald S. Bultje <rsbultje@gmail.com> Signed-off-by: James Almer <jamrial@gmail.com>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/*
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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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