1
0
mirror of https://github.com/trezor/trezor-firmware.git synced 2024-11-13 19:18:56 +00:00

Tool for checking TREZOR-generated mnemonic

This commit is contained in:
slush0 2014-02-02 15:24:47 +01:00
parent 845f874aea
commit c7729e082c

61
mnemonic_check.py Executable file
View File

@ -0,0 +1,61 @@
#!/usr/bin/python
'''
Use this script to cross-check that TREZOR generated valid
mnemonic sentence for given internal (TREZOR-generated)
and external (computer-generated) entropy.
'''
import binascii
import hashlib
import mnemonic
def generate_entropy(strength, internal_entropy, external_entropy):
'''
strength - length of produced seed. One of 128, 192, 256
random - binary stream of random data from external HRNG
'''
if strength not in (128, 192, 256):
raise Exception("Invalid strength")
if not internal_entropy:
raise Exception("Internal entropy is not provided")
if len(internal_entropy) < 32:
raise Exception("Internal entropy too short")
if not external_entropy:
raise Exception("External entropy is not provided")
if len(external_entropy) < 32:
raise Exception("External entropy too short")
entropy = hashlib.sha256(internal_entropy + external_entropy).digest()
entropy_stripped = entropy[:strength / 8]
if len(entropy_stripped) * 8 != strength:
raise Exception("Entropy length mismatch")
return entropy_stripped
def main():
comp = binascii.unhexlify(raw_input("Please enter computer-generated entropy (in hex): ").strip())
trzr = binascii.unhexlify(raw_input("Please enter TREZOR-generated entropy (in hex): ").strip())
word_count = int(raw_input("How many words your mnemonic has? "))
strength = word_count * 32 / 3
entropy = generate_entropy(strength, trzr, comp)
words = mnemonic.Mnemonic('english').to_mnemonic(entropy)
if not mnemonic.Mnemonic('english').check(words):
print "Mnemonic is invalid"
return
if len(words.split(' ')) != word_count:
print "Mnemonic length mismatch!"
return
print "Generated mnemonic is:", words
if __name__ == '__main__':
main()