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by brian
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/* Copyright (C) 2000-2001, 2003, 2005 MySQL AB
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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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 USE_PRAGMA_IMPLEMENTATION
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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, strlen(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 idx= (uint) (my_rnd(&rand)*255.0); |
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char a= decode_buff[idx]; |
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decode_buff[idx]= 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[(uchar) 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 < length; i++) |
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{
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shift^=(uint) (my_rnd(&rand)*255.0); |
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uint idx= (uint) (uchar) str[0]; |
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*str++ = (char) ((uchar) encode_buff[idx] ^ shift); |
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shift^= idx; |
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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) (my_rnd(&rand)*255.0); |
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uint idx= (uint) ((uchar) str[0] ^ shift); |
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*str = decode_buff[idx]; |
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shift^= (uint) (uchar) *str++; |
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}
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}
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