mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-21 15:00:27 +00:00
72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/*
|
|
* 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 */
|