mirror of
https://gitlab.com/pulsechaincom/staking-deposit-cli.git
synced 2024-12-25 12:57:18 +00:00
96200d76ae
* Move tests to /tests * Rename `src` to `eth2deposit` * Fix path * Fix path and move eth2deposit/utils/credentials.py -> eth2deposit/credentials.py * Update Makefile * Kick CI cache * Fix package setup * Fix path back * PR feedback from Carl
62 lines
1.8 KiB
Python
62 lines
1.8 KiB
Python
import os
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from unicodedata import normalize
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from secrets import randbits
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from typing import (
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List,
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Optional,
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)
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from eth2deposit.utils.crypto import (
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SHA256,
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PBKDF2,
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)
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def _get_word_list(language: str, path: str):
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return open(os.path.join(path, '%s.txt' % language)).readlines()
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def _get_word(*, word_list, index: int) -> str:
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assert index < 2048
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return word_list[index][:-1]
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def get_seed(*, mnemonic: str, password: str='') -> bytes:
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"""
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Derives the seed for the pre-image root of the tree.
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"""
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mnemonic = normalize('NFKD', mnemonic)
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salt = normalize('NFKD', 'mnemonic' + password).encode('utf-8')
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return PBKDF2(password=mnemonic, salt=salt, dklen=64, c=2048, prf='sha512')
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def get_languages(path) -> List[str]:
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"""
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Walk the `path` and list all the languages with word-lists available.
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"""
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(_, _, filenames) = next(os.walk(path))
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filenames = [name[:-4] for name in filenames]
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return filenames
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def get_mnemonic(*, language: str, words_path: str, entropy: Optional[bytes]=None) -> str:
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"""
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Returns a mnemonic string in a given `language` based on `entropy`.
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"""
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if entropy is None:
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entropy = randbits(256).to_bytes(32, 'big')
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entropy_length = len(entropy) * 8
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assert entropy_length in range(128, 257, 32)
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checksum_length = (entropy_length // 32)
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checksum = int.from_bytes(SHA256(entropy), 'big') >> 256 - checksum_length
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entropy_bits = int.from_bytes(entropy, 'big') << checksum_length
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entropy_bits += checksum
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entropy_length += checksum_length
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mnemonic = []
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word_list = _get_word_list(language, words_path)
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for i in range(entropy_length // 11 - 1, -1, -1):
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index = (entropy_bits >> i * 11) & 2**11 - 1
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word = _get_word(word_list=word_list, index=index)
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mnemonic.append(word)
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return ' '.join(mnemonic)
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