/*
  * AES-CTR cipher
  * Copyright (c) 2015 Eran Kornblau <erankor at gmail dot com>
  *
  * 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_AES_CTR_H
 #define AVUTIL_AES_CTR_H
 
 #include <stdint.h>
 
 #include "attributes.h"
 #include "version.h"
 
 #define AES_CTR_KEY_SIZE (16)
 #define AES_CTR_IV_SIZE (8)
 
 struct AVAESCTR;
 
 /**
  * Allocate an AVAESCTR context.
  */
 struct AVAESCTR *av_aes_ctr_alloc(void);
 
 /**
  * Initialize an AVAESCTR context.
  * @param key encryption key, must have a length of AES_CTR_KEY_SIZE
  */
 int av_aes_ctr_init(struct AVAESCTR *a, const uint8_t *key);
 
 /**
  * Release an AVAESCTR context.
  */
 void av_aes_ctr_free(struct AVAESCTR *a);
 
 /**
  * Process a buffer using a previously initialized context.
  * @param dst destination array, can be equal to src
  * @param src source array, can be equal to dst
  * @param size the size of src and dst
  */
 void av_aes_ctr_crypt(struct AVAESCTR *a, uint8_t *dst, const uint8_t *src, int size);
 
 /**
  * Get the current iv
  */
 const uint8_t* av_aes_ctr_get_iv(struct AVAESCTR *a);
 
 /**
  * Generate a random iv
  */
 void av_aes_ctr_set_random_iv(struct AVAESCTR *a);
 
 /**
  * Forcefully change the iv
  */
 void av_aes_ctr_set_iv(struct AVAESCTR *a, const uint8_t* iv);
 
 /**
  * Increment the top 64 bit of the iv (performed after each frame)
  */
 void av_aes_ctr_increment_iv(struct AVAESCTR *a);
 
 /**
  * @}
  */
 
 #endif /* AVUTIL_AES_CTR_H */