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add 8 bits to entropy target, to offset the constraint imposed by is_new_seed

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ThomasV 2014-08-28 17:40:36 +02:00
parent 4d71707be8
commit 8816d7072f
1 changed files with 2 additions and 1 deletions
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3
lib/mnemonic.py
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@ -83,7 +83,7 @@ class Mnemonic(object):
def make_seed(self, num_bits=128, custom_entropy=1): def make_seed(self, num_bits=128, custom_entropy=1):
n = int(math.ceil(math.log(custom_entropy,2))) n = int(math.ceil(math.log(custom_entropy,2)))
# we add at least 16 bits # we add at least 16 bits
n_added = max(16, num_bits-n) n_added = max(16, 8 + num_bits - n)
print_error("make_seed: adding %d bits"%n_added) print_error("make_seed: adding %d bits"%n_added)
my_entropy = ecdsa.util.randrange( pow(2, n_added) ) my_entropy = ecdsa.util.randrange( pow(2, n_added) )
nonce = 0 nonce = 0
@ -97,5 +97,6 @@ class Mnemonic(object):
# this removes 8 bits of entropy # this removes 8 bits of entropy
if is_new_seed(seed): if is_new_seed(seed):
break break
print_error('%d words'%len(seed.split()))
return seed return seed