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80 lines
2.3 KiB
C
80 lines
2.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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An implementation of arc4.
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Copyright (C) Jeremy Allison 2005.
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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; either version 3 of the License, or
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(at your option) any later version.
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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, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/*****************************************************************
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Initialize state for an arc4 crypt/decrpyt.
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arc4 state is 258 bytes - last 2 bytes are the index bytes.
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*****************************************************************/
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void smb_arc4_init(unsigned char arc4_state_out[258], const unsigned char *key, size_t keylen)
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{
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size_t ind;
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unsigned char j = 0;
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for (ind = 0; ind < 256; ind++) {
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arc4_state_out[ind] = (unsigned char)ind;
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}
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for( ind = 0; ind < 256; ind++) {
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unsigned char tc;
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j += (arc4_state_out[ind] + key[ind%keylen]);
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tc = arc4_state_out[ind];
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arc4_state_out[ind] = arc4_state_out[j];
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arc4_state_out[j] = tc;
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}
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arc4_state_out[256] = 0;
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arc4_state_out[257] = 0;
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}
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/*****************************************************************
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Do the arc4 crypt/decrpyt.
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arc4 state is 258 bytes - last 2 bytes are the index bytes.
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*****************************************************************/
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void smb_arc4_crypt(unsigned char arc4_state_inout[258], unsigned char *data, size_t len)
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{
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unsigned char index_i = arc4_state_inout[256];
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unsigned char index_j = arc4_state_inout[257];
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size_t ind;
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for( ind = 0; ind < len; ind++) {
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unsigned char tc;
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unsigned char t;
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index_i++;
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index_j += arc4_state_inout[index_i];
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tc = arc4_state_inout[index_i];
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arc4_state_inout[index_i] = arc4_state_inout[index_j];
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arc4_state_inout[index_j] = tc;
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t = arc4_state_inout[index_i] + arc4_state_inout[index_j];
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data[ind] = data[ind] ^ arc4_state_inout[t];
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}
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arc4_state_inout[256] = index_i;
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arc4_state_inout[257] = index_j;
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}
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