[GNUnet-SVN] r11026 - gnunet/src/util

[gnunet]

Author: grothoff
Date: 2010-04-22 11:21:18 +0200 (Thu, 22 Apr 2010)
New Revision: 11026

Modified:
   gnunet/src/util/crypto_random.c
Log:
make weakness more explicit

Modified: gnunet/src/util/crypto_random.c
===================================================================
--- gnunet/src/util/crypto_random.c     2010-04-22 09:15:55 UTC (rev 11025)
+++ gnunet/src/util/crypto_random.c     2010-04-22 09:21:18 UTC (rev 11026)
@@ -30,6 +30,18 @@
 #include <gcrypt.h>
 
 /**
+ * Create a cryptographically weak pseudo-random number in the interval of 0 
to 1.
+ * 
+ * @return number between 0 and 1.
+ */
+static double
+weak_random ()
+{
+  return ((double) RANDOM () / RAND_MAX);
+}
+
+
+/**
  * Produce a random value.
  *
  * @param mode desired quality of the random number
@@ -59,7 +71,7 @@
     }
   else
     {
-      ret = i * ((double) RANDOM () / RAND_MAX);
+      ret = i * weak_random ();
       if (ret >= i)
         ret = i - 1;
       return ret;
@@ -119,7 +131,7 @@
     }
   else
     {
-      ret = max * ((double) RANDOM () / RAND_MAX);
+      ret = max * weak_random ();
       if (ret >= max)
         ret = max - 1;
       return ret;