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/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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; either version 2 of the License, or
(at your option) any later version.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 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 __GNUC__
#pragma implementation // gcc: Class implementation
#endif
#include "mysql_priv.h"
SQL_CRYPT::SQL_CRYPT(const char *password)
{
ulong rand_nr[2];
hash_password(rand_nr,password);
crypt_init(rand_nr);
}
void SQL_CRYPT::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) (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[(unsigned char) 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) (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) (rnd(&rand)*255.0);
uint idx= (uint) ((unsigned char) str[0] ^ shift);
*str = decode_buff[idx];
shift^= (uint) (uchar) *str++;
}
}
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