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trezor-firmware/tests/test_entropy.py
2014-02-06 00:43:56 +01:00

30 lines
712 B
Python

import unittest
import common
import math
from trezorlib import messages_pb2 as messages
def entropy(data):
counts = {}
for c in data:
if c in counts:
counts[c] += 1
else:
counts[c] = 1
e = 0
for k,v in counts.iteritems():
p = 1.0 * v / len(data)
e -= p * math.log(p, 256)
return e
class TestEntropy(common.TrezorTest):
def test_entropy(self):
for l in [0, 1, 2, 3, 4, 5, 8, 9, 16, 17, 32, 33, 64, 65, 128, 129, 256, 257, 512, 513, 1024]:
ent = self.client.get_entropy(l)
self.assertTrue(len(ent) >= l)
print 'entropy = ', entropy(ent)
if __name__ == '__main__':
unittest.main()