Key.c revision 44dda7b2 
1/*
2Copyright 1989, 1998  The Open Group
3
4Permission to use, copy, modify, distribute, and sell this software and its
5documentation for any purpose is hereby granted without fee, provided that
6the above copyright notice appear in all copies and that both that
7copyright notice and this permission notice appear in supporting
8documentation.
9
10The above copyright notice and this permission notice shall be included in
11all copies or substantial portions of the Software.
12
13THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
16OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
17AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
18CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
19
20Except as contained in this notice, the name of The Open Group shall not be
21used in advertising or otherwise to promote the sale, use or other dealings
22in this Software without prior written authorization from The Open Group.
23 *
24 * Author:  Keith Packard, MIT X Consortium
25 */
26
27#ifdef HAVE_CONFIG_H
28#include <config.h>
29#endif
30#include <X11/Xos.h>
31#include <X11/X.h>
32#include <X11/Xmd.h>
33#include <X11/Xdmcp.h>
34
35static void
36getbits (long data, unsigned char *dst)
37{
38    dst[0] = (data      ) & 0xff;
39    dst[1] = (data >>  8) & 0xff;
40    dst[2] = (data >> 16) & 0xff;
41    dst[3] = (data >> 24) & 0xff;
42}
43
44#define Time_t time_t
45
46#include <stdlib.h>
47
48#if defined(HAVE_LRAND48) && defined(HAVE_SRAND48)
49#define srandom srand48
50#define random lrand48
51#endif
52#ifdef WIN32
53#include <process.h>
54#define srandom srand
55#define random rand
56#define getpid(x) _getpid(x)
57#endif
58
59void
60XdmcpGenerateKey (XdmAuthKeyPtr key)
61{
62    long    lowbits, highbits;
63
64    srandom ((int)getpid() ^ time((Time_t *)0));
65    lowbits = random ();
66    highbits = random ();
67    getbits (lowbits, key->data);
68    getbits (highbits, key->data + 4);
69}
70
71int
72XdmcpCompareKeys (const XdmAuthKeyPtr a, const XdmAuthKeyPtr b)
73{
74    int	i;
75
76    for (i = 0; i < 8; i++)
77	if (a->data[i] != b->data[i])
78	    return FALSE;
79    return TRUE;
80}
81
82void
83XdmcpIncrementKey (XdmAuthKeyPtr key)
84{
85    int	i;
86
87    i = 7;
88    while (++key->data[i] == 0)
89	if (--i < 0)
90	    break;
91}
92
93void
94XdmcpDecrementKey (XdmAuthKeyPtr key)
95{
96    int	i;
97
98    i = 7;
99    while (key->data[i]-- == 0)
100	if (--i < 0)
101	    break;
102}
103