mirror of
https://github.com/nyanmisaka/ffmpeg-rockchip.git
synced 2025-10-31 20:42:49 +08:00
e12f403678
* commit '588b6215b4c74945994eb9636b0699028c069ed2':
rtmpcrypt: Do the xtea decryption in little endian mode
xtea: Add functions for little endian mode
Conflicts:
libavutil/xtea.c
Merged-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
|
|
* 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 */
|