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/*
Copyright (c) 2000, 2003, 2005, 2006 MySQL AB, 2009 Sun Microsystems, Inc.
Use is subject to license terms.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
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 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
*/
/*
Functions to handle the encode() and decode() functions
The strongness of this crypt is large based on how good the random
generator is. It should be ok for short strings, but for communication one
needs something like 'ssh'.
*/
#ifdef USE_PRAGMA_IMPLEMENTATION
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
void SQL_CRYPT::init(ulong *rand_nr)
{
uint i;
randominit(&rand,rand_nr[0],rand_nr[1]);
for (i=0 ; i<=255; i++)
decode_buff[i]= (char) i;
for (i=0 ; i<= 255 ; i++)
{
int idx= (uint) (my_rnd(&rand)*255.0);
char a= decode_buff[idx];
decode_buff[idx]= decode_buff[i];
decode_buff[+i]=a;
}
for (i=0 ; i <= 255 ; i++)
encode_buff[(uchar) decode_buff[i]]=i;
org_rand=rand;
shift=0;
}
void SQL_CRYPT::encode(char *str,uint length)
{
for (uint i=0; i < length; i++)
{
shift^=(uint) (my_rnd(&rand)*255.0);
uint idx= (uint) (uchar) str[0];
*str++ = (char) ((uchar) encode_buff[idx] ^ shift);
shift^= idx;
}
}
void SQL_CRYPT::decode(char *str,uint length)
{
for (uint i=0; i < length; i++)
{
shift^=(uint) (my_rnd(&rand)*255.0);
uint idx= (uint) ((uchar) str[0] ^ shift);
*str = decode_buff[idx];
shift^= (uint) (uchar) *str++;
}
}
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