mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-12-15 10:58:09 +00:00
70 lines
2.2 KiB
Python
Executable File
70 lines
2.2 KiB
Python
Executable File
#!/usr/bin/python
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__doc__ = '''
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Use this script to cross-check that TREZOR generated valid
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mnemonic sentence for given internal (TREZOR-generated)
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and external (computer-generated) entropy.
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Keep in mind that you're entering secret information to this script.
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Leaking of these information may lead to stealing your bitcoins
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from your wallet! We strongly recommend to run this script only on
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highly secured computer (ideally live linux distribution
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without an internet connection).
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'''
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import binascii
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import hashlib
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import mnemonic
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def generate_entropy(strength, internal_entropy, external_entropy):
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'''
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strength - length of produced seed. One of 128, 192, 256
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random - binary stream of random data from external HRNG
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'''
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if strength not in (128, 192, 256):
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raise Exception("Invalid strength")
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if not internal_entropy:
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raise Exception("Internal entropy is not provided")
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if len(internal_entropy) < 32:
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raise Exception("Internal entropy too short")
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if not external_entropy:
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raise Exception("External entropy is not provided")
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if len(external_entropy) < 32:
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raise Exception("External entropy too short")
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entropy = hashlib.sha256(internal_entropy + external_entropy).digest()
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entropy_stripped = entropy[:strength / 8]
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if len(entropy_stripped) * 8 != strength:
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raise Exception("Entropy length mismatch")
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return entropy_stripped
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def main():
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print __doc__
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comp = binascii.unhexlify(raw_input("Please enter computer-generated entropy (in hex): ").strip())
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trzr = binascii.unhexlify(raw_input("Please enter TREZOR-generated entropy (in hex): ").strip())
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word_count = int(raw_input("How many words your mnemonic has? "))
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strength = word_count * 32 / 3
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entropy = generate_entropy(strength, trzr, comp)
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words = mnemonic.Mnemonic('english').to_mnemonic(entropy)
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if not mnemonic.Mnemonic('english').check(words):
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print "Mnemonic is invalid"
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return
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if len(words.split(' ')) != word_count:
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print "Mnemonic length mismatch!"
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return
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print "Generated mnemonic is:", words
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if __name__ == '__main__':
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main()
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