From 54abd2aa66069e6baf7769c496f46d9dba18db39 Mon Sep 17 00:00:00 2001 From: Gerald Carter Date: Fri, 30 Sep 2005 17:13:37 +0000 Subject: r10656: BIG merge from trunk. Features not copied over * \PIPE\unixinfo * winbindd's {group,alias}membership new functions * winbindd's lookupsids() functionality * swat (trunk changes to be reverted as per discussion with Deryck) (This used to be commit 939c3cb5d78e3a2236209b296aa8aba8bdce32d3) --- source3/lib/arc4.c | 80 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 source3/lib/arc4.c (limited to 'source3/lib/arc4.c') diff --git a/source3/lib/arc4.c b/source3/lib/arc4.c new file mode 100644 index 0000000000..03ca54c324 --- /dev/null +++ b/source3/lib/arc4.c @@ -0,0 +1,80 @@ +/* + 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; +} -- cgit