/* | |
* An 32-bit implementation of the XTEA algorithm | |
* | |
* Copyright (C) 2006-2015, ARM Limited, All Rights Reserved | |
* 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. | |
* | |
* This file is part of mbed TLS (https://tls.mbed.org) | |
*/ | |
#if !defined(MBEDTLS_CONFIG_FILE) | |
#include "mbedtls/config.h" | |
#else | |
#include MBEDTLS_CONFIG_FILE | |
#endif | |
#if defined(MBEDTLS_XTEA_C) | |
#include "mbedtls/xtea.h" | |
#include "mbedtls/platform_util.h" | |
#include <string.h> | |
#if defined(MBEDTLS_SELF_TEST) | |
#if defined(MBEDTLS_PLATFORM_C) | |
#include "mbedtls/platform.h" | |
#else | |
#include <stdio.h> | |
#define mbedtls_printf printf | |
#endif /* MBEDTLS_PLATFORM_C */ | |
#endif /* MBEDTLS_SELF_TEST */ | |
#if !defined(MBEDTLS_XTEA_ALT) | |
/* | |
* 32-bit integer manipulation macros (big endian) | |
*/ | |
#ifndef GET_UINT32_BE | |
#define GET_UINT32_BE(n,b,i) \ | |
{ \ | |
(n) = ( (uint32_t) (b)[(i) ] << 24 ) \ | |
| ( (uint32_t) (b)[(i) + 1] << 16 ) \ | |
| ( (uint32_t) (b)[(i) + 2] << 8 ) \ | |
| ( (uint32_t) (b)[(i) + 3] ); \ | |
} | |
#endif | |
#ifndef PUT_UINT32_BE | |
#define PUT_UINT32_BE(n,b,i) \ | |
{ \ | |
(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) ); \ | |
} | |
#endif | |
void mbedtls_xtea_init( mbedtls_xtea_context *ctx ) | |
{ | |
memset( ctx, 0, sizeof( mbedtls_xtea_context ) ); | |
} | |
void mbedtls_xtea_free( mbedtls_xtea_context *ctx ) | |
{ | |
if( ctx == NULL ) | |
return; | |
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_xtea_context ) ); | |
} | |
/* | |
* XTEA key schedule | |
*/ | |
void mbedtls_xtea_setup( mbedtls_xtea_context *ctx, const unsigned char key[16] ) | |
{ | |
int i; | |
memset( ctx, 0, sizeof(mbedtls_xtea_context) ); | |
for( i = 0; i < 4; i++ ) | |
{ | |
GET_UINT32_BE( ctx->k[i], key, i << 2 ); | |
} | |
} | |
/* | |
* XTEA encrypt function | |
*/ | |
int mbedtls_xtea_crypt_ecb( mbedtls_xtea_context *ctx, int mode, | |
const unsigned char input[8], unsigned char output[8]) | |
{ | |
uint32_t *k, v0, v1, i; | |
k = ctx->k; | |
GET_UINT32_BE( v0, input, 0 ); | |
GET_UINT32_BE( v1, input, 4 ); | |
if( mode == MBEDTLS_XTEA_ENCRYPT ) | |
{ | |
uint32_t sum = 0, delta = 0x9E3779B9; | |
for( i = 0; i < 32; i++ ) | |
{ | |
v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]); | |
sum += delta; | |
v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]); | |
} | |
} | |
else /* MBEDTLS_XTEA_DECRYPT */ | |
{ | |
uint32_t delta = 0x9E3779B9, sum = delta * 32; | |
for( i = 0; i < 32; i++ ) | |
{ | |
v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum>>11) & 3]); | |
sum -= delta; | |
v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]); | |
} | |
} | |
PUT_UINT32_BE( v0, output, 0 ); | |
PUT_UINT32_BE( v1, output, 4 ); | |
return( 0 ); | |
} | |
#if defined(MBEDTLS_CIPHER_MODE_CBC) | |
/* | |
* XTEA-CBC buffer encryption/decryption | |
*/ | |
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) | |
{ | |
int i; | |
unsigned char temp[8]; | |
if( length % 8 ) | |
return( MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH ); | |
if( mode == MBEDTLS_XTEA_DECRYPT ) | |
{ | |
while( length > 0 ) | |
{ | |
memcpy( temp, input, 8 ); | |
mbedtls_xtea_crypt_ecb( ctx, mode, input, output ); | |
for( i = 0; i < 8; i++ ) | |
output[i] = (unsigned char)( output[i] ^ iv[i] ); | |
memcpy( iv, temp, 8 ); | |
input += 8; | |
output += 8; | |
length -= 8; | |
} | |
} | |
else | |
{ | |
while( length > 0 ) | |
{ | |
for( i = 0; i < 8; i++ ) | |
output[i] = (unsigned char)( input[i] ^ iv[i] ); | |
mbedtls_xtea_crypt_ecb( ctx, mode, output, output ); | |
memcpy( iv, output, 8 ); | |
input += 8; | |
output += 8; | |
length -= 8; | |
} | |
} | |
return( 0 ); | |
} | |
#endif /* MBEDTLS_CIPHER_MODE_CBC */ | |
#endif /* !MBEDTLS_XTEA_ALT */ | |
#if defined(MBEDTLS_SELF_TEST) | |
/* | |
* XTEA tests vectors (non-official) | |
*/ | |
static const unsigned char xtea_test_key[6][16] = | |
{ | |
{ 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 } | |
}; | |
static const unsigned char xtea_test_pt[6][8] = | |
{ | |
{ 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 } | |
}; | |
static const unsigned char xtea_test_ct[6][8] = | |
{ | |
{ 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 } | |
}; | |
/* | |
* Checkup routine | |
*/ | |
int mbedtls_xtea_self_test( int verbose ) | |
{ | |
int i, ret = 0; | |
unsigned char buf[8]; | |
mbedtls_xtea_context ctx; | |
mbedtls_xtea_init( &ctx ); | |
for( i = 0; i < 6; i++ ) | |
{ | |
if( verbose != 0 ) | |
mbedtls_printf( " XTEA test #%d: ", i + 1 ); | |
memcpy( buf, xtea_test_pt[i], 8 ); | |
mbedtls_xtea_setup( &ctx, xtea_test_key[i] ); | |
mbedtls_xtea_crypt_ecb( &ctx, MBEDTLS_XTEA_ENCRYPT, buf, buf ); | |
if( memcmp( buf, xtea_test_ct[i], 8 ) != 0 ) | |
{ | |
if( verbose != 0 ) | |
mbedtls_printf( "failed\n" ); | |
ret = 1; | |
goto exit; | |
} | |
if( verbose != 0 ) | |
mbedtls_printf( "passed\n" ); | |
} | |
if( verbose != 0 ) | |
mbedtls_printf( "\n" ); | |
exit: | |
mbedtls_xtea_free( &ctx ); | |
return( ret ); | |
} | |
#endif /* MBEDTLS_SELF_TEST */ | |
#endif /* MBEDTLS_XTEA_C */ |