xtea.c File Reference

#include "mbedtls/config.h"
#include "mbedtls/xtea.h"
#include <string.h>
#include "mbedtls/platform.h"
#include "arc4_alt.h"

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Macros
#define	GET_UINT32_BE(n, b, i)
#define	PUT_UINT32_BE(n, b, i)

Functions
void	mbedtls_xtea_init (mbedtls_xtea_context *ctx)
	Initialize XTEA context. More...
void	mbedtls_xtea_free (mbedtls_xtea_context *ctx)
	Clear XTEA context. More...
void	mbedtls_xtea_setup (mbedtls_xtea_context *ctx, const unsigned char key[16])
	XTEA key schedule. More...
int	mbedtls_xtea_crypt_ecb (mbedtls_xtea_context *ctx, int mode, const unsigned char input[8], unsigned char output[8])
	XTEA cipher function. More...
int	mbedtls_xtea_crypt_cbc (mbedtls_xtea_context *ctx, int mode, size_t length, unsigned char iv[8], const unsigned char *input, unsigned char *output)
	XTEA CBC cipher function. More...
int	mbedtls_xtea_self_test (int verbose)
	Checkup routine. More...

Variables
static const unsigned char	xtea_test_key [6][16]
static const unsigned char	xtea_test_pt [6][8]
static const unsigned char	xtea_test_ct [6][8]

Macro Definition Documentation

GET_UINT32_BE

#define GET_UINT32_BE	(		n,
			b,
			i
	)

Value:

{                                                       \
    (n) = ( (uint32_t) (b)[(i)    ] << 24 )             \
        | ( (uint32_t) (b)[(i) + 1] << 16 )             \
        | ( (uint32_t) (b)[(i) + 2] <<  8 )             \
        | ( (uint32_t) (b)[(i) + 3]       );            \
}

PUT_UINT32_BE

#define PUT_UINT32_BE	(		n,
			b,
			i
	)

Value:

{                                                       \
    (b)[(i)    ] = (unsigned char) ( (n) >> 24 );       \
    (b)[(i) + 1] = (unsigned char) ( (n) >> 16 );       \
    (b)[(i) + 2] = (unsigned char) ( (n) >>  8 );       \
    (b)[(i) + 3] = (unsigned char) ( (n)       );       \
}

Function Documentation

mbedtls_xtea_crypt_cbc()

int mbedtls_xtea_crypt_cbc	(	mbedtls_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	MBEDTLS_XTEA_ENCRYPT or MBEDTLS_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, MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0

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mbedtls_xtea_crypt_ecb()

int mbedtls_xtea_crypt_ecb	(	mbedtls_xtea_context *	ctx,
		int	mode,
		const unsigned char	input[8],
		unsigned char	output[8]
	)

XTEA cipher function.

Parameters

ctx	XTEA context
mode	MBEDTLS_XTEA_ENCRYPT or MBEDTLS_XTEA_DECRYPT
input	8-byte input block
output	8-byte output block

Returns

0 if successful

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mbedtls_xtea_free()

void mbedtls_xtea_free

(

mbedtls_xtea_context *

ctx

)

Clear XTEA context.

Parameters

ctx	XTEA context to be cleared

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mbedtls_xtea_init()

void mbedtls_xtea_init

(

mbedtls_xtea_context *

ctx

)

Initialize XTEA context.

Parameters

ctx	XTEA context to be initialized

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mbedtls_xtea_self_test()

int mbedtls_xtea_self_test

(

int

verbose

)

Checkup routine.

Returns

0 if successful, or 1 if the test failed

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mbedtls_xtea_setup()

void mbedtls_xtea_setup	(	mbedtls_xtea_context *	ctx,
		const unsigned char	key[16]
	)

XTEA key schedule.

Parameters

ctx	XTEA context to be initialized
key	the secret key

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Variable Documentation

xtea_test_ct

const unsigned char xtea_test_ct[6][8]

static

Initial value:

=
{
    { 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
    { 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
    { 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
}

xtea_test_key

const unsigned char xtea_test_key[6][16]

static

Initial value:

=
{
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
     0x0c, 0x0d, 0x0e, 0x0f },
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
     0x0c, 0x0d, 0x0e, 0x0f },
   { 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
     0x0c, 0x0d, 0x0e, 0x0f },
   { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00 },
   { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00 },
   { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
     0x00, 0x00, 0x00, 0x00 }
}

xtea_test_pt

const unsigned char xtea_test_pt[6][8]

static

Initial value:

=
{
    { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
    { 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
    { 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
    { 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
}