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