/*
  * 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;

 
 /**
  * Allocate an AVXTEA context.
  */
 AVXTEA *av_xtea_alloc(void);

 
 /**
  * Initialize an AVXTEA context.
  *

  * @param ctx an AVXTEA context

  * @param key a key of 16 bytes used for encryption/decryption,
  *            interpreted as big endian 32 bit numbers

  */
 void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
 
 /**

  * Initialize an AVXTEA context.
  *
  * @param ctx an AVXTEA context
  * @param key a key of 16 bytes used for encryption/decryption,
  *            interpreted as little endian 32 bit numbers
  */
 void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]);
 
 /**

  * Encrypt or decrypt a buffer using a previously initialized context,
  * in big endian format.

  *

  * @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);
 
 /**

  * Encrypt or decrypt a buffer using a previously initialized context,
  * in little endian format.
  *
  * @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_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                       int count, uint8_t *iv, int decrypt);
 
 /**

  * @}
  */
 
 #endif /* AVUTIL_XTEA_H */