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/*
Unix SMB/CIFS implementation.
An implementation of arc4.
Copyright (C) Jeremy Allison 2005.
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/*****************************************************************
Initialize state for an arc4 crypt/decrpyt.
arc4 state is 258 bytes - last 2 bytes are the index bytes.
*****************************************************************/
void smb_arc4_init(unsigned char arc4_state_out[258], const unsigned char *key, size_t keylen)
{
size_t ind;
unsigned char j = 0;
for (ind = 0; ind < 256; ind++) {
arc4_state_out[ind] = (unsigned char)ind;
}
for( ind = 0; ind < 256; ind++) {
unsigned char tc;
j += (arc4_state_out[ind] + key[ind%keylen]);
tc = arc4_state_out[ind];
arc4_state_out[ind] = arc4_state_out[j];
arc4_state_out[j] = tc;
}
arc4_state_out[256] = 0;
arc4_state_out[257] = 0;
}
/*****************************************************************
Do the arc4 crypt/decrpyt.
arc4 state is 258 bytes - last 2 bytes are the index bytes.
*****************************************************************/
void smb_arc4_crypt(unsigned char arc4_state_inout[258], unsigned char *data, size_t len)
{
unsigned char index_i = arc4_state_inout[256];
unsigned char index_j = arc4_state_inout[257];
size_t ind;
for( ind = 0; ind < len; ind++) {
unsigned char tc;
unsigned char t;
index_i++;
index_j += arc4_state_inout[index_i];
tc = arc4_state_inout[index_i];
arc4_state_inout[index_i] = arc4_state_inout[index_j];
arc4_state_inout[index_j] = tc;
t = arc4_state_inout[index_i] + arc4_state_inout[index_j];
data[ind] = data[ind] ^ arc4_state_inout[t];
}
arc4_state_inout[256] = index_i;
arc4_state_inout[257] = index_j;
}
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