xtea.h File Reference

XTEA block cipher (32-bit). More...

#include "config.h"
#include <string.h>
#include <inttypes.h>

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Data Structures
struct	xtea_context
	XTEA context structure. More...
Defines
#define	XTEA_ENCRYPT   1
#define	XTEA_DECRYPT   0
#define	POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH   -0x0028
	The data input has an invalid length.
Functions
void	xtea_setup (xtea_context *ctx, const unsigned char key[16])
	XTEA key schedule.
int	xtea_crypt_ecb (xtea_context *ctx, int mode, const unsigned char input[8], unsigned char output[8])
	XTEA cipher function.
int	xtea_crypt_cbc (xtea_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output)
	XTEA CBC cipher function.
int	xtea_self_test (int verbose)
	Checkup routine.

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Detailed Description

XTEA block cipher (32-bit).

Copyright (C) 2006-2013, 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.

Definition in file xtea.h.

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Define Documentation

#define POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH   -0x0028

The data input has an invalid length.

Definition at line 44 of file xtea.h.

Referenced by polarssl_strerror(), and xtea_crypt_cbc().

#define XTEA_DECRYPT   0

Definition at line 42 of file xtea.h.

Referenced by xtea_crypt_cbc().

#define XTEA_ENCRYPT   1

Definition at line 41 of file xtea.h.

Referenced by xtea_crypt_ecb(), and xtea_self_test().

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Function Documentation

int xtea_crypt_cbc	(	xtea_context *	ctx,
		int	mode,
		size_t	length,
		unsigned char	iv[8],
		const unsigned char *	input,
		unsigned char *	output
	)

XTEA CBC cipher function.

Parameters:

	ctx	XTEA context
	mode	XTEA_ENCRYPT or XTEA_DECRYPT
	length	the length of input, multiple of 8
	iv	initialization vector for CBC mode
	input	input block
	output	output block

Returns:

0 if successful, POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0

Definition at line 118 of file xtea.c.

References POLARSSL_ERR_XTEA_INVALID_INPUT_LENGTH, xtea_crypt_ecb(), and XTEA_DECRYPT.

int xtea_crypt_ecb	(	xtea_context *	ctx,
		int	mode,
		const unsigned char	input[8],
		unsigned char	output[8]
	)

XTEA cipher function.

Parameters:

	ctx	XTEA context
	mode	XTEA_ENCRYPT or XTEA_DECRYPT
	input	8-byte input block
	output	8-byte output block

Returns:

0 if successful

Definition at line 75 of file xtea.c.

References GET_UINT32_BE, xtea_context::k, PUT_UINT32_BE, and XTEA_ENCRYPT.

Referenced by xtea_crypt_cbc(), and xtea_self_test().

int xtea_self_test

(

int

verbose

)

Checkup routine.

Returns:

0 if successful, or 1 if the test failed

Definition at line 214 of file xtea.c.

References xtea_crypt_ecb(), XTEA_ENCRYPT, xtea_setup(), xtea_test_ct, xtea_test_key, and xtea_test_pt.

void xtea_setup	(	xtea_context *	ctx,
		const unsigned char	key[16]
	)

XTEA key schedule.

Parameters:

	ctx	XTEA context to be initialized
	key	the secret key

Definition at line 60 of file xtea.c.

References GET_UINT32_BE, and xtea_context::k.

Referenced by xtea_self_test().