[deb_ffmpeg.git] / ffmpeg / libavutil / xtea.h

/*
 * A 32-bit implementation of the XTEA algorithm
 * Copyright (c) 2012 Samuel Pitoiset
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#ifndef AVUTIL_XTEA_H
#define AVUTIL_XTEA_H

#include <stdint.h>

/**
 * @file
 * @brief Public header for libavutil XTEA algorithm
 * @defgroup lavu_xtea XTEA
 * @ingroup lavu_crypto
 * @{
 */

typedef struct AVXTEA {
    uint32_t key[16];
} AVXTEA;

/**
 * Initialize an AVXTEA context.
 *
 * @param ctx an AVXTEA context
 * @param key a key of 16 bytes used for encryption/decryption
 */
void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);

/**
 * Encrypt or decrypt a buffer using a previously initialized context.
 *
 * @param ctx an AVXTEA context
 * @param dst destination array, can be equal to src
 * @param src source array, can be equal to dst
 * @param count number of 8 byte blocks
 * @param iv initialization vector for CBC mode, if NULL then ECB will be used
 * @param decrypt 0 for encryption, 1 for decryption
 */
void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                   int count, uint8_t *iv, int decrypt);

/**
 * @}
 */

#endif /* AVUTIL_XTEA_H */
Commit	Line	Data
2ba45a60 DM	1	/*
	2	* A 32-bit implementation of the XTEA algorithm
	3	* Copyright (c) 2012 Samuel Pitoiset
	4	*
	5	* This file is part of FFmpeg.
	6	*
	7	* FFmpeg is free software; you can redistribute it and/or
	8	* modify it under the terms of the GNU Lesser General Public
	9	* License as published by the Free Software Foundation; either
	10	* version 2.1 of the License, or (at your option) any later version.
	11	*
	12	* FFmpeg is distributed in the hope that it will be useful,
	13	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	15	* Lesser General Public License for more details.
	16	*
	17	* You should have received a copy of the GNU Lesser General Public
	18	* License along with FFmpeg; if not, write to the Free Software
	19	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	20	*/
	21
	22	#ifndef AVUTIL_XTEA_H
	23	#define AVUTIL_XTEA_H
	24
	25	#include <stdint.h>
	26
	27	/**
	28	* @file
	29	* @brief Public header for libavutil XTEA algorithm
	30	* @defgroup lavu_xtea XTEA
	31	* @ingroup lavu_crypto
	32	* @{
	33	*/
	34
	35	typedef struct AVXTEA {
	36	uint32_t key[16];
	37	} AVXTEA;
	38
	39	/**
	40	* Initialize an AVXTEA context.
	41	*
	42	* @param ctx an AVXTEA context
	43	* @param key a key of 16 bytes used for encryption/decryption
	44	*/
	45	void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
	46
	47	/**
	48	* Encrypt or decrypt a buffer using a previously initialized context.
	49	*
	50	* @param ctx an AVXTEA context
	51	* @param dst destination array, can be equal to src
	52	* @param src source array, can be equal to dst
	53	* @param count number of 8 byte blocks
	54	* @param iv initialization vector for CBC mode, if NULL then ECB will be used
	55	* @param decrypt 0 for encryption, 1 for decryption
	56	*/
	57	void av_xtea_crypt(struct AVXTEA ctx, uint8_t dst, const uint8_t *src,
	58	int count, uint8_t *iv, int decrypt);
	59
	60	/**
	61	* @}
	62	*/
	63
	64	#endif /* AVUTIL_XTEA_H */