263 lines
7.1 KiB
C
263 lines
7.1 KiB
C
/*
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* An 32-bit implementation of the XTEA algorithm
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*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_XTEA_C)
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#include "mbedtls/xtea.h"
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#include "mbedtls/platform_util.h"
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#include <string.h>
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#if defined(MBEDTLS_SELF_TEST)
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#else
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#include <stdio.h>
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#define mbedtls_printf printf
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#endif /* MBEDTLS_PLATFORM_C */
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#endif /* MBEDTLS_SELF_TEST */
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#if !defined(MBEDTLS_XTEA_ALT)
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/*
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* 32-bit integer manipulation macros (big endian)
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*/
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#ifndef GET_UINT32_BE
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#define GET_UINT32_BE(n, b, i) \
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{ \
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(n) = ((uint32_t)(b)[(i)] << 24) | ((uint32_t)(b)[(i) + 1] << 16) | ((uint32_t)(b)[(i) + 2] << 8) | ((uint32_t)(b)[(i) + 3]); \
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}
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#endif
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#ifndef PUT_UINT32_BE
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#define PUT_UINT32_BE(n, b, i) \
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{ \
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(b)[(i)] = (unsigned char)((n) >> 24); \
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(b)[(i) + 1] = (unsigned char)((n) >> 16); \
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(b)[(i) + 2] = (unsigned char)((n) >> 8); \
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(b)[(i) + 3] = (unsigned char)((n)); \
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}
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#endif
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void mbedtls_xtea_init(mbedtls_xtea_context *ctx)
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{
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memset(ctx, 0, sizeof(mbedtls_xtea_context));
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}
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void mbedtls_xtea_free(mbedtls_xtea_context *ctx)
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{
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if (ctx == NULL) {
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return;
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}
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mbedtls_platform_zeroize(ctx, sizeof(mbedtls_xtea_context));
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}
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/*
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* XTEA key schedule
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*/
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void mbedtls_xtea_setup(mbedtls_xtea_context *ctx, const unsigned char key[16])
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{
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int i;
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memset(ctx, 0, sizeof(mbedtls_xtea_context));
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for (i = 0; i < 4; i++) {
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GET_UINT32_BE(ctx->k[i], key, i << 2);
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}
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}
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/*
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* XTEA encrypt function
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*/
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int mbedtls_xtea_crypt_ecb(mbedtls_xtea_context *ctx, int mode,
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const unsigned char input[8], unsigned char output[8])
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{
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uint32_t *k, v0, v1, i;
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k = ctx->k;
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GET_UINT32_BE(v0, input, 0);
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GET_UINT32_BE(v1, input, 4);
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if (mode == MBEDTLS_XTEA_ENCRYPT) {
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uint32_t sum = 0, delta = 0x9E3779B9;
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for (i = 0; i < 32; i++) {
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v0 += (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
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sum += delta;
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v1 += (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
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}
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} else /* MBEDTLS_XTEA_DECRYPT */
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{
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uint32_t delta = 0x9E3779B9, sum = delta * 32;
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for (i = 0; i < 32; i++) {
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v1 -= (((v0 << 4) ^ (v0 >> 5)) + v0) ^ (sum + k[(sum >> 11) & 3]);
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sum -= delta;
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v0 -= (((v1 << 4) ^ (v1 >> 5)) + v1) ^ (sum + k[sum & 3]);
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}
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}
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PUT_UINT32_BE(v0, output, 0);
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PUT_UINT32_BE(v1, output, 4);
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return (0);
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}
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#if defined(MBEDTLS_CIPHER_MODE_CBC)
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/*
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* XTEA-CBC buffer encryption/decryption
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*/
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int mbedtls_xtea_crypt_cbc(mbedtls_xtea_context *ctx, int mode, size_t length,
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unsigned char iv[8], const unsigned char *input,
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unsigned char *output)
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{
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int i;
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unsigned char temp[8];
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if (length % 8) {
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return (MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH);
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}
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if (mode == MBEDTLS_XTEA_DECRYPT) {
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while (length > 0) {
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memcpy(temp, input, 8);
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mbedtls_xtea_crypt_ecb(ctx, mode, input, output);
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for (i = 0; i < 8; i++) {
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output[i] = (unsigned char)(output[i] ^ iv[i]);
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}
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memcpy(iv, temp, 8);
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input += 8;
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output += 8;
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length -= 8;
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}
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} else {
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while (length > 0) {
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for (i = 0; i < 8; i++) {
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output[i] = (unsigned char)(input[i] ^ iv[i]);
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}
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mbedtls_xtea_crypt_ecb(ctx, mode, output, output);
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memcpy(iv, output, 8);
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input += 8;
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output += 8;
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length -= 8;
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}
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}
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return (0);
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}
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#endif /* MBEDTLS_CIPHER_MODE_CBC */
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#endif /* !MBEDTLS_XTEA_ALT */
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#if defined(MBEDTLS_SELF_TEST)
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/*
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* XTEA tests vectors (non-official)
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*/
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static const unsigned char xtea_test_key[6][16] = {
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
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0x0c, 0x0d, 0x0e, 0x0f },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00 },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00 },
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{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00 }
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};
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static const unsigned char xtea_test_pt[6][8] = {
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{ 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0x5a, 0x5b, 0x6e, 0x27, 0x89, 0x48, 0xd7, 0x7f },
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{ 0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0x70, 0xe1, 0x22, 0x5d, 0x6e, 0x4e, 0x76, 0x55 }
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};
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static const unsigned char xtea_test_ct[6][8] = {
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{ 0x49, 0x7d, 0xf3, 0xd0, 0x72, 0x61, 0x2c, 0xb5 },
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{ 0xe7, 0x8f, 0x2d, 0x13, 0x74, 0x43, 0x41, 0xd8 },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 },
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{ 0xa0, 0x39, 0x05, 0x89, 0xf8, 0xb8, 0xef, 0xa5 },
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{ 0xed, 0x23, 0x37, 0x5a, 0x82, 0x1a, 0x8c, 0x2d },
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{ 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41, 0x41 }
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};
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/*
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* Checkup routine
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*/
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int mbedtls_xtea_self_test(int verbose)
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{
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int i, ret = 0;
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unsigned char buf[8];
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mbedtls_xtea_context ctx;
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mbedtls_xtea_init(&ctx);
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for (i = 0; i < 6; i++) {
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if (verbose != 0) {
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mbedtls_printf(" XTEA test #%d: ", i + 1);
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}
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memcpy(buf, xtea_test_pt[i], 8);
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mbedtls_xtea_setup(&ctx, xtea_test_key[i]);
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mbedtls_xtea_crypt_ecb(&ctx, MBEDTLS_XTEA_ENCRYPT, buf, buf);
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if (memcmp(buf, xtea_test_ct[i], 8) != 0) {
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if (verbose != 0) {
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mbedtls_printf("failed\n");
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}
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ret = 1;
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goto exit;
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}
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if (verbose != 0) {
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mbedtls_printf("passed\n");
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}
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}
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if (verbose != 0) {
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mbedtls_printf("\n");
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}
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exit:
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mbedtls_xtea_free(&ctx);
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return (ret);
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}
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#endif /* MBEDTLS_SELF_TEST */
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#endif /* MBEDTLS_XTEA_C */
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