80 lines
2.1 KiB
C++
80 lines
2.1 KiB
C++
/* Copyright (C) 1998 TcX AB & Monty Program KB & Detron HB
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This software is distributed with NO WARRANTY OF ANY KIND. No author or
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distributor accepts any responsibility for the consequences of using it, or
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for whether it serves any particular purpose or works at all, unless he or
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she says so in writing. Refer to the Free Public License (the "License")
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for full details.
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Every copy of this file must include a copy of the License, normally in a
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plain ASCII text file named PUBLIC. The License grants you the right to
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copy, modify and redistribute this file, but only under certain conditions
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described in the License. Among other things, the License requires that
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the copyright notice and this notice be preserved on all copies. */
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/*
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Functions to handle the encode() and decode() functions
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The strongness of this crypt is large based on how good the random
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generator is. It should be ok for short strings, but for communication one
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needs something like 'ssh'.
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*/
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#ifdef __GNUC__
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#pragma implementation // gcc: Class implementation
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#endif
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#include "mysql_priv.h"
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SQL_CRYPT::SQL_CRYPT(const char *password)
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{
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ulong rand_nr[2];
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hash_password(rand_nr,password);
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crypt_init(rand_nr);
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}
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void SQL_CRYPT::crypt_init(ulong *rand_nr)
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{
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uint i;
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randominit(&rand,rand_nr[0],rand_nr[1]);
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for (i=0 ; i<=255; i++)
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decode_buff[i]= (char) i;
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for (i=0 ; i<= 255 ; i++)
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{
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int index= (uint) (rnd(&rand)*255.0);
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char a= decode_buff[index];
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decode_buff[index]= decode_buff[i];
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decode_buff[+i]=a;
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}
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for (i=0 ; i <= 255 ; i++)
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encode_buff[(unsigned char) decode_buff[i]]=i;
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org_rand=rand;
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shift=0;
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}
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void SQL_CRYPT::encode(char *str,uint length)
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{
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for (uint i=0; i < (int) length; i++)
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{
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shift^=(uint) (rnd(&rand)*255.0);
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uint index= (uint) (uchar) str[0];
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*str++ = (char) ((uchar) encode_buff[index] ^ shift);
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shift^= index;
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}
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}
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void SQL_CRYPT::decode(char *str,uint length)
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{
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for (uint i=0; i < length; i++)
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{
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shift^=(uint) (rnd(&rand)*255.0);
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uint index= (uint) ((unsigned char) str[0] ^ shift);
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*str = decode_buff[index];
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shift^= (uint) (uchar) *str++;
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}
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}
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