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- /*
- * $XConsortium: Unwrap.c,v 1.7 91/07/23 22:28:13 keith Exp $
- *
- * Copyright 1989 Massachusetts Institute of Technology
- *
- * Permission to use, copy, modify, and distribute this software and its
- * documentation for any purpose and without fee is hereby granted, provided
- * that the above copyright notice appear in all copies and that both that
- * copyright notice and this permission notice appear in supporting
- * documentation, and that the name of M.I.T. not be used in advertising
- * or publicity pertaining to distribution of the software without specific,
- * written prior permission. M.I.T. makes no representations about the
- * suitability of this software for any purpose. It is provided "as is"
- * without express or implied warranty.
- *
- * M.I.T. DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL M.I.T.
- * BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
- * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
- * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- *
- * Author: Keith Packard, MIT X Consortium
- */
-
- #include <X11/Xos.h>
- #include <X11/X.h>
- #include <X11/Xmd.h>
- #include <X11/Xdmcp.h>
-
- #ifdef HASXDMAUTH
-
- /*
- * The following function exists only to demonstrate the
- * desired functional interface for this routine. You will
- * need to add the appropriate algorithm if you wish to
- * use XDM-AUTHENTICATION-1/XDM-AUTHORIZATION-1.
- *
- * The interface for this routine is quite simple. All three
- * arguments are arrays of 8 unsigned characters, the first two
- * are 64 bits of useful data, the last is 56 bits of useful
- * data packed into 8 bytes, using the low 7 bits of each
- * byte, filling the high bit with odd parity.
- *
- * Examine the XDMCP specification for the correct algorithm
- */
-
- #include "Wrap.h"
-
- void
- XdmcpUnwrap (input, wrapper, output, bytes)
- unsigned char *input, *output;
- unsigned char *wrapper;
- int bytes;
- {
- int i, j, k;
- unsigned char tmp[8];
- unsigned char blocks[2][8];
- unsigned char expand_wrapper[8];
- auth_wrapper_schedule schedule;
-
- _XdmcpWrapperToOddParity (wrapper, expand_wrapper);
- _XdmcpAuthSetup ((unsigned char *) wrapper, schedule);
-
- k = 0;
- for (j = 0; j < bytes; j += 8)
- {
- if (bytes - j < 8)
- return; /* bad input length */
- for (i = 0; i < 8; i++)
- blocks[k][i] = input[j + i];
- _XdmcpAuthDoIt ((unsigned char *) (input + j), (unsigned char *) tmp, schedule, 0);
- /* block chaining */
- k = (k == 0) ? 1 : 0;
- for (i = 0; i < 8; i++)
- {
- if (j == 0)
- output[j + i] = tmp[i];
- else
- output[j + i] = tmp[i] ^ blocks[k][i];
- }
- }
- }
-
- #endif /* HASXDMAUTH */
-