mirror of
https://github.com/SwallowOS/xorg_lib_libXdmcp
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134 lines
3.3 KiB
C
134 lines
3.3 KiB
C
/*
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* $Xorg: Wrap.c,v 1.4 2001/02/09 02:03:49 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/Wrap.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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* 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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XdmcpWrap (
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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;
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int len;
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unsigned char tmp[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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for (j = 0; j < bytes; j += 8)
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{
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len = 8;
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if (bytes - j < len)
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len = bytes - j;
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/* block chaining */
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for (i = 0; i < len; i++)
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{
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if (j == 0)
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tmp[i] = input[i];
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else
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tmp[i] = input[j + i] ^ output[j - 8 + i];
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}
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for (; i < 8; i++)
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{
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if (j == 0)
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tmp[i] = 0;
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else
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tmp[i] = 0 ^ output[j - 8 + i];
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}
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_XdmcpAuthDoIt (tmp, (output + j), schedule, 1);
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}
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}
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/*
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* Given a 56 bit wrapper in XDMCP format, create a 56
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* bit wrapper in 7-bits + odd parity format
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*/
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static int
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OddParity (unsigned char c)
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{
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c = c ^ (c >> 4);
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c = c ^ (c >> 2);
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c = c ^ (c >> 1);
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return ~c & 0x1;
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}
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/*
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* Spread the 56 bit wrapper among 8 bytes, using the upper 7 bits
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* of each byte, and storing an odd parity bit in the low bit
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*/
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void
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_XdmcpWrapperToOddParity (
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unsigned char *in,
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unsigned char *out)
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{
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int ashift, bshift;
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int i;
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unsigned char c;
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ashift = 7;
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bshift = 1;
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for (i = 0; i < 7; i++)
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{
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c = ((in[i] << ashift) | (in[i+1] >> bshift)) & 0x7f;
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out[i] = (c << 1) | OddParity (c);
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ashift--;
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bshift++;
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}
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c = in[i];
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out[i] = (c << 1) | OddParity(c);
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}
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#endif
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