[Bug classpath/24481] SecureRandom.setSeed has no impact

[csm at gnu dot org]

------- Comment #5 from csm at gnu dot org  2006-04-11 04:21 -------
The original issue seems to be fixed; on gcj version `gcj (GCC) 4.2.0 20060410
(experimental)' I get this output from the `seed' testcase:

> Byte difference in a seeded PRNG: 64
> Seed data: 
> 9c1185a5c5e9fc5461288977ee8f548b2258d3138bbc57e4cbe8b6a1d2c999ef6253e0a6e58196ae643db8559e6ba7c97214bd66197b97184d68e3b0654b

David, are you saying that if you have a program like:

> import java.security.SecureRandom;
> 
> class sr
> {
>   public static void main (String[] argv) throws Throwable
>   {
>     SecureRandom sr = new SecureRandom ();
>     byte[] b = new byte[64];
>     sr.nextBytes (b);
>     for (int i = 0; i < b.length; i++)
>       {
>         System.out.print (b[i]);
>         System.out.print (' ');
>       }
>     System.out.println ();
>   }
> }

...that you get the same output every time?

If so, this is because our default SecureRandom isn't seeded when created.
Ideally, we would try to use `/dev/random,' or some timing data to get a random
seed.


-- 

csm at gnu dot org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |david at jpackage dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=24481