misc/winutils/include/libavutil/xtea.h
author koda
Wed, 24 Oct 2012 14:55:31 +0100
changeset 7813 7ac83d79b897
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/*
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 * A 32-bit implementation of the XTEA algorithm
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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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 * Libav 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 Libav; 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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 * @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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 * 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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 */
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void av_xtea_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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 *
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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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 * @}
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 */
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#endif /* AVUTIL_XTEA_H */