96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
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/*
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* $Xorg: Unwrap.c,v 1.4 2001/02/09 02:03:48 xorgcvs Exp $
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*
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*
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Copyright 1989, 1998 The Open Group
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Permission to use, copy, modify, distribute, and sell this software and its
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documentation for any purpose is hereby granted without fee, provided that
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the above copyright notice appear in all copies and that both that
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copyright notice and this permission notice appear in supporting
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documentation.
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
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AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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Except as contained in this notice, the name of The Open Group shall not be
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used in advertising or otherwise to promote the sale, use or other dealings
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in this Software without prior written authorization from The Open Group.
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* *
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* Author: Keith Packard, MIT X Consortium
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*/
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/* $XFree86: xc/lib/Xdmcp/Unwrap.c,v 1.3 2001/01/17 19:42:44 dawes Exp $ */
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <X11/Xos.h>
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#include <X11/X.h>
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#include <X11/Xmd.h>
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#include <X11/Xdmcp.h>
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#ifdef HASXDMAUTH
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/*
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* The following function exists only to demonstrate the
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* desired functional interface for this routine. You will
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* need to add the appropriate algorithm if you wish to
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* use XDM-AUTHENTICATION-1/XDM-AUTHORIZATION-1.
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*
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* The interface for this routine is quite simple. All three
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* arguments are arrays of 8 unsigned characters, the first two
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* are 64 bits of useful data, the last is 56 bits of useful
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* data packed into 8 bytes, using the low 7 bits of each
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* byte, filling the high bit with odd parity.
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*
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* Examine the XDMCP specification for the correct algorithm
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*/
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#include "Wrap.h"
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void
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XdmcpUnwrap (
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unsigned char *input,
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unsigned char *wrapper,
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unsigned char *output,
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int bytes)
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{
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int i, j, k;
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unsigned char tmp[8];
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unsigned char blocks[2][8];
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unsigned char expand_wrapper[8];
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auth_wrapper_schedule schedule;
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_XdmcpWrapperToOddParity (wrapper, expand_wrapper);
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_XdmcpAuthSetup (expand_wrapper, schedule);
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k = 0;
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for (j = 0; j < bytes; j += 8)
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{
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if (bytes - j < 8)
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return; /* bad input length */
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for (i = 0; i < 8; i++)
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blocks[k][i] = input[j + i];
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_XdmcpAuthDoIt ((unsigned char *) (input + j), (unsigned char *) tmp, schedule, 0);
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/* block chaining */
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k = (k == 0) ? 1 : 0;
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for (i = 0; i < 8; i++)
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{
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if (j == 0)
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output[j + i] = tmp[i];
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else
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output[j + i] = tmp[i] ^ blocks[k][i];
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}
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}
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}
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#endif /* HASXDMAUTH */
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