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/**
* \file xtea.h
*
* \brief XTEA block cipher (32-bit)
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef MBEDTLS_XTEA_H
#define MBEDTLS_XTEA_H
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#include <stddef.h>
#include <stdint.h>
#define MBEDTLS_XTEA_ENCRYPT 1
#define MBEDTLS_XTEA_DECRYPT 0
#define MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH -0x0028 /**< The data input has an invalid length. */
/* MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED is deprecated and should not be used. */
#define MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED -0x0029 /**< XTEA hardware accelerator failed. */
#ifdef __cplusplus
extern "C" {
#endif
#if !defined(MBEDTLS_XTEA_ALT)
// Regular implementation
//
/**
* \brief XTEA context structure
*/
typedef struct mbedtls_xtea_context
{
uint32_t k[4]; /*!< key */
}
mbedtls_xtea_context;
#else /* MBEDTLS_XTEA_ALT */
#include "xtea_alt.h"
#endif /* MBEDTLS_XTEA_ALT */
/**
* \brief Initialize XTEA context
*
* \param ctx XTEA context to be initialized
*/
void mbedtls_xtea_init( mbedtls_xtea_context *ctx );
/**
* \brief Clear XTEA context
*
* \param ctx XTEA context to be cleared
*/
void mbedtls_xtea_free( mbedtls_xtea_context *ctx );
/**
* \brief XTEA key schedule
*
* \param ctx XTEA context to be initialized
* \param key the secret key
*/
void mbedtls_xtea_setup( mbedtls_xtea_context *ctx, const unsigned char key[16] );
/**
* \brief XTEA cipher function
*
* \param ctx XTEA context
* \param mode MBEDTLS_XTEA_ENCRYPT or MBEDTLS_XTEA_DECRYPT
* \param input 8-byte input block
* \param output 8-byte output block
*
* \return 0 if successful
*/
int mbedtls_xtea_crypt_ecb( mbedtls_xtea_context *ctx,
int mode,
const unsigned char input[8],
unsigned char output[8] );
#if defined(MBEDTLS_CIPHER_MODE_CBC)
/**
* \brief XTEA CBC cipher function
*
* \param ctx XTEA context
* \param mode MBEDTLS_XTEA_ENCRYPT or MBEDTLS_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,
* MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH if the length % 8 != 0
*/
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);
#endif /* MBEDTLS_CIPHER_MODE_CBC */
#if defined(MBEDTLS_SELF_TEST)
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int mbedtls_xtea_self_test( int verbose );
#endif /* MBEDTLS_SELF_TEST */
#ifdef __cplusplus
}
#endif
#endif /* xtea.h */
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