1 files changed, 128 insertions, 0 deletions
diff --git a/cipher/rand-dummy.c b/cipher/rand-dummy.c
new file mode 100644
index 000000000..3e7a42573
--- /dev/null
+++ b/cipher/rand-dummy.c
@@ -0,0 +1,128 @@
+/* rand-dummy.c  -  INSECURE dummy random device
+ *	Copyright (C) 1998 Free Software Foundation, Inc.
+ *
+ * This file is part of GNUPG.
+ *
+ * GNUPG is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * GNUPG is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
+ */
+
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#ifdef	HAVE_GETHRTIME
+  #include <sys/times.h>
+#endif
+#ifndef HAVE_GETTIMEOFTIME
+  #include <sys/times.h>
+#endif
+#ifdef HAVE_GETRUSAGE
+  #include <sys/resource.h>
+#endif
+#include <string.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include "util.h"
+#include "ttyio.h"
+#include "i18n.h"
+#include "rand-internal.h"
+#ifdef USE_RAND_DUMMY /* a dummy random file so we can do some tests */
+
+
+#ifndef RAND_MAX   /* for SunOS */
+  #define RAND_MAX 32767
+#endif
+
+#if __GNUC__
+  #warning Using the insecure dummy random device
+#endif
+
+void
+random_poll()
+{
+    char buf[POOLSIZE/5];
+    read_random_source( buf, POOLSIZE/5, 1 ); /* read dummy data */
+    add_randomness( buf, POOLSIZE/5, 2);
+    memset( buf, 0, POOLSIZE/5);
+}
+
+
+void
+fast_random_poll()
+{
+  #if HAVE_GETHRTIME
+    {	hrtime_t tv;
+	tv = gethrtime(void);
+	add_randomness( &tv, sizeof(tv), 1 );
+    }
+  #elif HAVE_GETTIMEOFTIME
+    {	struct timeval tv;
+	if( gettimeofday( &tv, NULL ) )
+	    BUG();
+	add_randomness( &tv.tv_sec, sizeof(tv.tv_sec), 1 );
+	add_randomness( &tv.tv_usec, sizeof(tv.tv_usec), 1 );
+    }
+  #else /* use times */
+    {	struct tms buf;
+	times( &buf );
+	add_randomness( &buf, sizeof buf, 1 );
+    }
+  #endif
+  #ifdef HAVE_GETRUSAGE
+    {	struct rusage buf;
+	if( getrusage( RUSAGE_SELF, &buf ) )
+	    BUG();
+	add_randomness( &buf, sizeof buf, 1 );
+	memset( &buf, 0, sizeof buf );
+    }
+  #endif
+}
+
+
+
+void
+read_random_source( byte *buffer, size_t length, int level )
+{
+    static int initialized=0;
+
+    if( !initialized ) {
+	log_info(_("warning: using insecure random number generator!!\n"));
+	tty_printf(_("The random number generator is only a kludge to let\n"
+		   "it compile - it is in no way a strong RNG!\n\n"
+		   "DON'T USE ANY DATA GENERATED BY THIS PROGRAM!!\n\n"));
+	initialized=1;
+      #ifdef HAVE_RAND
+	srand(make_timestamp()*getpid());
+      #else
+	srandom(make_timestamp()*getpid());
+      #endif
+    }
+
+  #ifdef HAVE_RAND
+    while( length-- )
+	*buffer++ = ((unsigned)(1 + (int) (256.0*rand()/(RAND_MAX+1.0)))-1);
+  #else
+    while( length-- )
+	*buffer++ = ((unsigned)(1 + (int) (256.0*random()/(RAND_MAX+1.0)))-1);
+  #endif
+}
+
+
+#endif /* USE_RAND_DUMMY */