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/**
* \file xtea.h
*
* \brief XTEA block cipher (32-bit)
*
* Copyright (C) 2006-2010, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_XTEA_H
#define POLARSSL_XTEA_H
#include <string.h>
#ifdef _MSC_VER
#include <basetsd.h>
typedef UINT32 uint32_t;
#else
#include <inttypes.h>
#endif
#define XTEA_ENCRYPT 1
#define XTEA_DECRYPT 0
#define POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH -0x0028 /**< The data input has an invalid length. */
/**
* \brief XTEA context structure
*/
typedef struct
{
uint32_t k[4]; /*!< key */
}
xtea_context;
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief XTEA key schedule
*
* \param ctx XTEA context to be initialized
* \param key the secret key
*/
void xtea_setup( xtea_context *ctx, unsigned char key[16] );
/**
* \brief XTEA cipher function
*
* \param ctx XTEA context
* \param mode XTEA_ENCRYPT or XTEA_DECRYPT
* \param input 8-byte input block
* \param output 8-byte output block
*
* \return 0 if successful
*/
int xtea_crypt_ecb( xtea_context *ctx,
int mode,
unsigned char input[8],
unsigned char output[8] );
/**
* \brief XTEA CBC cipher function
*
* \param ctx XTEA context
* \param mode XTEA_ENCRYPT or XTEA_DECRYPT
* \param length the length of input, multiple of 8
* \param iv initialization vector for CBC mode
* \param input input block
* \param output output block
*
* \return 0 if successful,
* POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0
*/
int xtea_crypt_cbc( xtea_context *ctx,
int mode,
size_t length,
unsigned char iv[8],
unsigned char *input,
unsigned char *output);
/*
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int xtea_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* xtea.h */
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