def entropy_from_mnemonic(mnemonic: Mnemonic, lang: str = "en") -> BinStr:
"Return the entropy from the Electrum versioned mnemonic sentence."
# verify that it is a valid Electrum mnemonic sentence
version_from_mnemonic(mnemonic)
indexes = indexes_from_mnemonic(mnemonic, lang)
base = WORDLISTS.language_length(lang)
return bin_str_entropy_from_wordlist_indexes(indexes, base)
def entropy_from_mnemonic(mnemonic: Mnemonic, lang: str = "en") -> BinStr:
"Return the entropy from the BIP39 checksummed mnemonic sentence."
indexes = indexes_from_mnemonic(mnemonic, lang)
base = WORDLISTS.language_length(lang)
cs_entropy = bin_str_entropy_from_wordlist_indexes(indexes, base)
bits = int(len(cs_entropy) * 32 / 33)
# entropy is only the first part of cs_entropy
# the second part being the checksum, to be verified
bin_str_entropy, checksum = _entropy_checksum(cs_entropy[:bits])
if cs_entropy[bits:] != checksum:
err_msg = f"invalid checksum: {cs_entropy[bits:]}; expected: {checksum}"
raise BTClibValueError(err_msg)
return bin_str_entropy
def test_indexes() -> None:
for entropy in ("0", "00000000000"):
indexes = wordlist_indexes_from_bin_str_entropy(entropy, 2048)
assert indexes == [0]
entropy = "000000000000"
indexes = wordlist_indexes_from_bin_str_entropy(entropy, 2048)
assert indexes == [0, 0]
test_vector = [
[1268, 535, 810, 685, 433, 811, 1385, 1790, 421, 570, 567, 1313],
[0, 0, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 0],
[0, 0, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 2047, 0],
]
for indx in test_vector:
entropy = bin_str_entropy_from_wordlist_indexes(indx, 2048)
indexes = wordlist_indexes_from_bin_str_entropy(entropy, 2048)
assert indexes == indx