IABSD.fr/xenocara/lib/libXdmcp/Key.c

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• Author : matthieu
  Date : 2024-07-09 09:59:07
  Hash : ed3c8c7e
  Message : Update libXdmcp to 1.1.5

• lib/libXdmcp/Key.c

• /*
  Copyright 1989, 1998  The Open Group
  
  Permission to use, copy, modify, distribute, and sell this software and its
  documentation for any purpose is hereby granted without fee, provided that
  the above copyright notice appear in all copies and that both that
  copyright notice and this permission notice appear in supporting
  documentation.
  
  The above copyright notice and this permission notice shall be included in
  all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
  OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
  AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  Except as contained in this notice, the name of The Open Group shall not be
  used in advertising or otherwise to promote the sale, use or other dealings
  in this Software without prior written authorization from The Open Group.
   *
   * Author:  Keith Packard, MIT X Consortium
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif
  #include <X11/Xos.h>
  #include <X11/X.h>
  #include <X11/Xmd.h>
  #include <X11/Xdmcp.h>
  #include <stdlib.h>
  
  #ifndef HAVE_ARC4RANDOM_BUF
  static void
  getbits (long data, unsigned char *dst)
  {
      dst[0] = (data      ) & 0xff;
      dst[1] = (data >>  8) & 0xff;
      dst[2] = (data >> 16) & 0xff;
      dst[3] = (data >> 24) & 0xff;
  }
  
  #define Time_t time_t
  
  #if defined(HAVE_LRAND48) && defined(HAVE_SRAND48)
  #define srandom srand48
  #define random lrand48
  #endif
  #ifdef WIN32
  #include <process.h>
  #define srandom srand
  #define random rand
  #define getpid(x) _getpid(x)
  #endif
  
  /* Solaris 11.3.0 - 11.4.15 only define getentropy() in <sys/random.h> */
  #if HAVE_GETENTROPY && HAVE_SYS_RANDOM_H
  # include <sys/random.h>
  #endif
  
  static void
  insecure_getrandom_buf (unsigned char *auth, int len)
  {
      long    lowbits, highbits;
  
      srandom ((int)getpid() ^ time((Time_t *)0));
      lowbits = random ();
      highbits = random ();
      getbits (lowbits, auth);
      getbits (highbits, auth + 4);
  }
  
  static void
  arc4random_buf (void *auth, int len)
  {
  #if HAVE_GETENTROPY
      int	    ret;
  
      /* weak emulation of arc4random through the getentropy libc call */
      ret = getentropy (auth, len);
      if (ret == 0)
  	return;
  #endif /* HAVE_GETENTROPY */
  
      insecure_getrandom_buf (auth, len);
  }
  
  #endif /* !defined(HAVE_ARC4RANDOM_BUF) */
  
  void
  XdmcpGenerateKey (XdmAuthKeyPtr key)
  {
      arc4random_buf(key->data, 8);
  }
  
  int
  XdmcpCompareKeys (const XdmAuthKeyPtr a, const XdmAuthKeyPtr b)
  {
      int	i;
  
      for (i = 0; i < 8; i++)
  	if (a->data[i] != b->data[i])
  	    return FALSE;
      return TRUE;
  }
  
  void
  XdmcpIncrementKey (XdmAuthKeyPtr key)
  {
      int	i;
  
      i = 7;
      while (++key->data[i] == 0)
  	if (--i < 0)
  	    break;
  }
  
  void
  XdmcpDecrementKey (XdmAuthKeyPtr key)
  {
      int	i;
  
      i = 7;
      while (key->data[i]-- == 0)
  	if (--i < 0)
  	    break;
  }