900df44546
wpa_supplicant is using MbedTLS API's for crypto algorithms. For calling them a duplicate set of modules is maintained prepended with 'fast_'. Remove these and use flag USE_MBEDTLS_CRYPTO instead to separate modules calling MbedTLS API's from native implementation.
170 lines
4.2 KiB
C
170 lines
4.2 KiB
C
/*
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* AES-128 CBC
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*
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* Copyright (c) 2003-2007, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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/*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may 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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* Hardware crypto support Copyright 2017-2019 Espressif Systems (Shanghai) PTE LTD
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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,
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* WITHOUT 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 "utils/includes.h"
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#include "utils/common.h"
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#include "crypto/aes.h"
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#include "crypto/aes_wrap.h"
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#ifdef USE_MBEDTLS_CRYPTO
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#include "mbedtls/aes.h"
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/**
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* aes_128_cbc_encrypt - AES-128 CBC encryption
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* @key: Encryption key
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* @iv: Encryption IV for CBC mode (16 bytes)
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* @data: Data to encrypt in-place
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* @data_len: Length of data in bytes (must be divisible by 16)
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* Returns: 0 on success, -1 on failure
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*/
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int
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aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
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{
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int ret = 0;
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mbedtls_aes_context ctx;
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u8 cbc[AES_BLOCK_SIZE];
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mbedtls_aes_init(&ctx);
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ret = mbedtls_aes_setkey_enc(&ctx, key, 128);
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if(ret < 0) {
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mbedtls_aes_free(&ctx);
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return ret;
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}
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os_memcpy(cbc, iv, AES_BLOCK_SIZE);
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ret = mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_ENCRYPT, data_len, cbc, data, data);
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mbedtls_aes_free(&ctx);
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return ret;
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}
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/**
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* aes_128_cbc_decrypt - AES-128 CBC decryption
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* @key: Decryption key
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* @iv: Decryption IV for CBC mode (16 bytes)
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* @data: Data to decrypt in-place
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* @data_len: Length of data in bytes (must be divisible by 16)
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* Returns: 0 on success, -1 on failure
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*/
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int
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aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
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{
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int ret = 0;
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mbedtls_aes_context ctx;
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u8 cbc[AES_BLOCK_SIZE];
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mbedtls_aes_init(&ctx);
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ret = mbedtls_aes_setkey_dec(&ctx, key, 128);
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if(ret < 0) {
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mbedtls_aes_free(&ctx);
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return ret;
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}
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os_memcpy(cbc, iv, AES_BLOCK_SIZE);
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ret = mbedtls_aes_crypt_cbc(&ctx, MBEDTLS_AES_DECRYPT, data_len, cbc, data, data);
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mbedtls_aes_free(&ctx);
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return ret;
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}
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#else /* USE_MBEDTLS_CRYPTO */
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/**
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* aes_128_cbc_encrypt - AES-128 CBC encryption
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* @key: Encryption key
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* @iv: Encryption IV for CBC mode (16 bytes)
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* @data: Data to encrypt in-place
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* @data_len: Length of data in bytes (must be divisible by 16)
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* Returns: 0 on success, -1 on failure
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*/
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int
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aes_128_cbc_encrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
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{
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void *ctx;
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u8 cbc[AES_BLOCK_SIZE];
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u8 *pos = data;
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int i, j, blocks;
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ctx = aes_encrypt_init(key, 16);
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if (ctx == NULL)
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return -1;
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os_memcpy(cbc, iv, AES_BLOCK_SIZE);
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blocks = data_len / AES_BLOCK_SIZE;
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for (i = 0; i < blocks; i++) {
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for (j = 0; j < AES_BLOCK_SIZE; j++)
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cbc[j] ^= pos[j];
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aes_encrypt(ctx, cbc, cbc);
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os_memcpy(pos, cbc, AES_BLOCK_SIZE);
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pos += AES_BLOCK_SIZE;
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}
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aes_encrypt_deinit(ctx);
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return 0;
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}
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/**
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* aes_128_cbc_decrypt - AES-128 CBC decryption
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* @key: Decryption key
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* @iv: Decryption IV for CBC mode (16 bytes)
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* @data: Data to decrypt in-place
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* @data_len: Length of data in bytes (must be divisible by 16)
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* Returns: 0 on success, -1 on failure
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*/
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int
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aes_128_cbc_decrypt(const u8 *key, const u8 *iv, u8 *data, size_t data_len)
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{
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void *ctx;
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u8 cbc[AES_BLOCK_SIZE], tmp[AES_BLOCK_SIZE];
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u8 *pos = data;
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int i, j, blocks;
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ctx = aes_decrypt_init(key, 16);
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if (ctx == NULL)
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return -1;
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os_memcpy(cbc, iv, AES_BLOCK_SIZE);
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blocks = data_len / AES_BLOCK_SIZE;
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for (i = 0; i < blocks; i++) {
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os_memcpy(tmp, pos, AES_BLOCK_SIZE);
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aes_decrypt(ctx, pos, pos);
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for (j = 0; j < AES_BLOCK_SIZE; j++)
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pos[j] ^= cbc[j];
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os_memcpy(cbc, tmp, AES_BLOCK_SIZE);
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pos += AES_BLOCK_SIZE;
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}
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aes_decrypt_deinit(ctx);
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return 0;
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}
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#endif /* USE_MBEDTLS_CRYPTO */
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