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/* Copyright (c) 2002, 2019, Oracle and/or its affiliates. All rights reserved.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License, version 2.0,
as published by the Free Software Foundation.
This program is also distributed with certain software (including
but not limited to OpenSSL) that is licensed under separate terms,
as designated in a particular file or component or in included license
documentation. The authors of MySQL hereby grant you an additional
permission to link the program and your derivative works with the
separately licensed software that they have included with MySQL.
Without limiting anything contained in the foregoing, this file,
which is part of C Driver for MySQL (Connector/C), is also subject to the
Universal FOSS Exception, version 1.0, a copy of which can be found at
http://oss.oracle.com/licenses/universal-foss-exception.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License, version 2.0, for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
/**
@file mysys/my_aes.cc
*/
#include <sys/types.h>
#include "m_string.h"
#include "my_aes.h"
#include "my_inttypes.h"
#include "mysys/my_aes_impl.h"
/**
Transforms an arbitrary long key into a fixed length AES key
AES keys are of fixed length. This routine takes an arbitrary long key
iterates over it in AES key length increment and XORs the bytes with the
AES key buffer being prepared.
The bytes from the last incomplete iteration are XORed to the start
of the key until their depletion.
Needed since crypto function routines expect a fixed length key.
@param [in] key Key to use for real key creation
@param [in] key_length Length of the key
@param [out] rkey Real key (used by OpenSSL/WolfSSL)
@param [out] opmode encryption mode
*/
void my_aes_create_key(const unsigned char *key, uint key_length, uint8 *rkey,
enum my_aes_opmode opmode) {
const uint key_size = my_aes_opmode_key_sizes[opmode] / 8;
uint8 *rkey_end; /* Real key boundary */
uint8 *ptr; /* Start of the real key*/
const uint8 *sptr; /* Start of the working key */
const uint8 *key_end = key + key_length; /* Working key boundary*/
rkey_end = rkey + key_size;
memset(rkey, 0, key_size); /* Set initial key */
for (ptr = rkey, sptr = key; sptr < key_end; ptr++, sptr++) {
if (ptr == rkey_end) /* Just loop over tmp_key until we used all key */
ptr = rkey;
*ptr ^= *sptr;
}
}
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