def reseed(self, ticks=None):
"""Use entropy to generate new seed for PRNG"""
if ticks is None:
ticks = self.RESEED_TIME
v0 = self.fast.accumulate()
v_i = hash(v0 + v0 + chr(0) * 4)
# now compute Vp_t
for i in range(1, ticks):
# XXX how many bits should I extend i to?
istr = struct.pack('i', i)[0]
prev = v_i
v_i = hash(v_i + v0 + istr)
zap(prev)
zap(self.key)
self.key = hash_ex(hash(v_i + self.key), self.KEY_SIZE)
self.cipher = DES3.new(self.key, DES3.ECB)
self.counter = bytes_to_long(self.cipher.encrypt('\000' * 8))
def reset(self):
"""Reset the estimates to zero"""
self.estBits = 0 # the user's estimate
self.zEstBits = 0 # the zlib estimate
zap(self.input)
self.input = ''
