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| author | Raymond Hettinger <python@rcn.com> | 2014-05-14 05:09:23 (GMT) |
|---|---|---|
| committer | Raymond Hettinger <python@rcn.com> | 2014-05-14 05:09:23 (GMT) |
| commit | ddb39e799d65748c5ea42c344170befc90af9e64 (patch) | |
| tree | 7d9b53921e001a17db74e7ed8ba30d7c87e8cd49 | |
| parent | a5413c499702a74fdc50e4bc8e7e6a480856a1f9 (diff) | |
| download | cpython-ddb39e799d65748c5ea42c344170befc90af9e64.zip cpython-ddb39e799d65748c5ea42c344170befc90af9e64.tar.gz cpython-ddb39e799d65748c5ea42c344170befc90af9e64.tar.bz2 | |
Issue #21470: Do a better job seeding the random number generator
to fully cover its state space.
| -rw-r--r-- | Lib/random.py | 4 | ||||
| -rw-r--r-- | Misc/NEWS | 3 |
2 files changed, 6 insertions, 1 deletions
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 @@ class Random(_random.Random): 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 @@ -52,6 +52,9 @@ Library - Issue #21306: Backport hmac.compare_digest from Python 3. This is part of PEP 466. +- Issue #21470: Do a better job seeding the random number generator by + using enough bytes to span the full state space of the Mersenne Twister. + - Issue #21469: Reduced the risk of false positives in robotparser by checking to make sure that robots.txt has been read or does not exist prior to returning True in can_fetch(). |