9ec363a25d
A lot of internally used crypto headers are publicly includeable in user projects. This leads to bug reports when these headers are incorrectly used or the API's are not used as intended. Move all crypto headers into private crypto src folder, also move crypto_ops into Supplicant to remove dependecy on crypto headers. Closes IDF-476
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 "aes.h"
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#include "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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