commit ddb39e799d65748c5ea42c344170befc90af9e64
author Raymond Hettinger <python@rcn.com> Tue May 13 22:09:23 2014 -0700
committer Raymond Hettinger <python@rcn.com> Tue May 13 22:09:23 2014 -0700
tree 7d9b53921e001a17db74e7ed8ba30d7c87e8cd49
parent a5413c499702a74fdc50e4bc8e7e6a480856a1f9

Issue #21470: Do a better job seeding the random number generator
to fully cover its state space.

Lib/random.py

diff --git a/Lib/random.py b/Lib/random.py
index 2f2f091..e89fae6 100644
--- a/Lib/random.py
+++ b/Lib/random.py
@@ -108,7 +108,9 @@
 
         if a is None:
             try:
-                a = long(_hexlify(_urandom(32)), 16)
+                # Seed with enough bytes to span the 19937 bit
+                # state space for the Mersenne Twister
+                a = long(_hexlify(_urandom(2500)), 16)
             except NotImplementedError:
                 import time
                 a = long(time.time() * 256) # use fractional seconds