mirror of
https://gitlab.com/pulsechaincom/staking-deposit-cli.git
synced 2025-01-10 13:01:22 +00:00
78 lines
2.5 KiB
Python
78 lines
2.5 KiB
Python
import os
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import sys
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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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Optional,
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Sequence,
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Tuple,
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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 _resource_path(relative_path: str) -> str:
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""" Get absolute path to resource, works for dev and for PyInstaller """
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try:
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# PyInstaller creates a temp folder and stores path in _MEIPASS
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base_path = sys._MEIPASS # type: ignore
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except Exception:
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base_path = os.path.abspath(".")
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return os.path.join(base_path, relative_path)
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def _get_word_list(language: str, path: str) -> Sequence[str]:
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path = _resource_path(path)
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return open(os.path.join(path, '%s.txt' % language), encoding='utf-8').readlines()
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def _get_word(*, word_list: Sequence[str], 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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Derive the seed for the pre-image root of the tree.
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Ref: https://github.com/bitcoin/bips/blob/master/bip-0039.mediawiki#from-mnemonic-to-seed
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"""
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encoded_mnemonic = normalize('NFKD', mnemonic).encode('utf-8')
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salt = normalize('NFKD', 'mnemonic' + password).encode('utf-8')
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return PBKDF2(password=encoded_mnemonic, salt=salt, dklen=64, c=2048, prf='sha512')
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def get_languages(path: str) -> Tuple[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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path = _resource_path(path)
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(_, _, filenames) = next(os.walk(path))
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languages = tuple([name[:-4] for name in filenames])
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return languages
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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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Return 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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