xtea.c File Reference

#include "polarssl/config.h"
#include "polarssl/xtea.h"
#include <string.h>
#include <stdio.h>

Include dependency graph for xtea.c:

Go to the source code of this file.

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.
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]

---

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().

---

Variable Documentation

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 }
}

Definition at line 201 of file xtea.c.

Referenced by xtea_self_test().

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 }
}

Definition at line 175 of file xtea.c.

Referenced by xtea_self_test().

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 }
}

Definition at line 191 of file xtea.c.

Referenced by xtea_self_test().