/*

 * A 32-bit implementation of the XTEA algorithm

 *

 * This file is part of Libav.

 *

 * Libav 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.

 *

 * Libav 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 Libav; 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>

/**

 * @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 */