95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/*
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* A 32-bit implementation of the XTEA algorithm
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* Copyright (c) 2012 Samuel Pitoiset
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_XTEA_H
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#define AVUTIL_XTEA_H
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#include <stdint.h>
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/**
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* @file
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* @brief Public header for libavutil XTEA algorithm
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* @defgroup lavu_xtea XTEA
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* @ingroup lavu_crypto
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* @{
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*/
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typedef struct AVXTEA {
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uint32_t key[16];
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} AVXTEA;
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/**
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* Allocate an AVXTEA context.
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*/
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AVXTEA *av_xtea_alloc(void);
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/**
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* Initialize an AVXTEA context.
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*
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* @param ctx an AVXTEA context
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* @param key a key of 16 bytes used for encryption/decryption,
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* interpreted as big endian 32 bit numbers
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*/
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void av_xtea_init(struct AVXTEA *ctx, const uint8_t key[16]);
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/**
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* Initialize an AVXTEA context.
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*
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* @param ctx an AVXTEA context
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* @param key a key of 16 bytes used for encryption/decryption,
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* interpreted as little endian 32 bit numbers
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*/
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void av_xtea_le_init(struct AVXTEA *ctx, const uint8_t key[16]);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context,
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* in big endian format.
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*
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* @param ctx an AVXTEA context
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* @param dst destination array, can be equal to src
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* @param src source array, can be equal to dst
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* @param count number of 8 byte blocks
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* @param iv initialization vector for CBC mode, if NULL then ECB will be used
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_xtea_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
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int count, uint8_t *iv, int decrypt);
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/**
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* Encrypt or decrypt a buffer using a previously initialized context,
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* in little endian format.
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*
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* @param ctx an AVXTEA context
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* @param dst destination array, can be equal to src
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* @param src source array, can be equal to dst
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* @param count number of 8 byte blocks
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* @param iv initialization vector for CBC mode, if NULL then ECB will be used
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* @param decrypt 0 for encryption, 1 for decryption
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*/
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void av_xtea_le_crypt(struct AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
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int count, uint8_t *iv, int decrypt);
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/**
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* @}
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*/
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#endif /* AVUTIL_XTEA_H */
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