mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-28 20:53:54 +02:00
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
|
/*
|
||
|
|
* 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 */
|