/*
  * A 32-bit implementation of the TEA algorithm
  * Copyright (c) 2015 Vesselin Bontchev
  *
  * 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_TEA_H
 #define AVUTIL_TEA_H
 
 #include <stdint.h>
 
 /**
  * @file
  * @brief Public header for libavutil TEA algorithm
  * @defgroup lavu_tea TEA
  * @ingroup lavu_crypto
  * @{
  */
 
 extern const int av_tea_size;
 
 struct AVTEA;
 
 /**
   * Allocate an AVTEA context
   * To free the struct: av_free(ptr)
   */
 struct AVTEA *av_tea_alloc(void);
 
 /**
  * Initialize an AVTEA context.
  *
  * @param ctx an AVTEA context
  * @param key a key of 16 bytes used for encryption/decryption
  * @param rounds the number of rounds in TEA (64 is the "standard")
  */
 void av_tea_init(struct AVTEA *ctx, const uint8_t key[16], int rounds);
 
 /**
  * Encrypt or decrypt a buffer using a previously initialized context.
  *
  * @param ctx an AVTEA 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_tea_crypt(struct AVTEA *ctx, uint8_t *dst, const uint8_t *src,
                   int count, uint8_t *iv, int decrypt);
 
 /**
  * @}
  */
 
 #endif /* AVUTIL_TEA_H */