60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
/* Copyright (c) 2002, 2014, 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 as published by
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the Free Software Foundation; version 2 of the License.
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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 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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#include <my_global.h>
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#include <m_string.h>
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#include <my_aes.h>
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#include "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 key [in] Key to use for real key creation
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@param key_length [in] Length of the key
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@param rkey [out] Real key (used by OpenSSL/YaSSL)
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@param opmode [out] encryption mode
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*/
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void my_aes_create_key(const unsigned char *key, uint key_length,
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uint8 *rkey, enum my_aes_opmode opmode)
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{
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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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uint8 *sptr; /* Start of the working key */
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uint8 *key_end= ((uint8 *)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= (uint8 *)key; sptr < key_end; ptr++, sptr++)
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{
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if (ptr == rkey_end)
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/* 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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