mirror of
https://github.com/trezor/trezor-firmware.git
synced 2024-11-29 10:58:21 +00:00
96 lines
2.9 KiB
Python
Executable File
96 lines
2.9 KiB
Python
Executable File
#!/usr/bin/env python3
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# This file is part of the Trezor project.
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#
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# Copyright (C) 2012-2022 SatoshiLabs and contributors
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#
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# This library is free software: you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License version 3
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# as published by the Free Software Foundation.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the License along with this library.
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# If not, see <https://www.gnu.org/licenses/lgpl-3.0.html>.
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import hashlib
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import mnemonic
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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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def generate_entropy(
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strength: int, internal_entropy: bytes, external_entropy: bytes
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) -> bytes:
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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 ValueError("Invalid strength")
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if not internal_entropy:
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raise ValueError("Internal entropy is not provided")
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if len(internal_entropy) < 32:
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raise ValueError("Internal entropy too short")
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if not external_entropy:
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raise ValueError("External entropy is not provided")
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if len(external_entropy) < 32:
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raise ValueError("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 ValueError("Entropy length mismatch")
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return entropy_stripped
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def main() -> None:
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print(__doc__)
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comp = bytes.fromhex(
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input("Please enter computer-generated entropy (in hex): ").strip()
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)
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trzr = bytes.fromhex(
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input("Please enter Trezor-generated entropy (in hex): ").strip()
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)
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word_count = int(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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