I realized my error: https://github.com/vergl4s/ethereum-mnemonic-utils works, but the full derivation path I was looking for is m/44'/60'/0'/0/0 (note the extra /0 to select the first account). Here is a full example:
#!/usr/bin/env python3
'''
MIT License
Copyright (c) 2018 Luis Teixeira
Copyright (c) 2019 Niklas Baumstark
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
'''
import binascii, hashlib, hmac, struct
from ecdsa.curves import SECP256k1
from eth_utils import to_checksum_address, keccak as eth_utils_keccak
BIP39_PBKDF2_ROUNDS = 2048
BIP39_SALT_MODIFIER = "mnemonic"
BIP32_PRIVDEV = 0x80000000
BIP32_CURVE = SECP256k1
BIP32_SEED_MODIFIER = b'Bitcoin seed'
ETH_DERIVATION_PATH = "m/44'/60'/0'/0"
class PublicKey:
def __init__(self, private_key):
self.point = int.from_bytes(private_key, byteorder='big') * BIP32_CURVE.generator
def __bytes__(self):
xstr = self.point.x().to_bytes(32, byteorder='big')
parity = self.point.y() & 1
return (2 + parity).to_bytes(1, byteorder='big') + xstr
def address(self):
x = self.point.x()
y = self.point.y()
s = x.to_bytes(32, 'big') + y.to_bytes(32, 'big')
return to_checksum_address(eth_utils_keccak(s)[12:])
def mnemonic_to_bip39seed(mnemonic, passphrase):
mnemonic = bytes(mnemonic, 'utf8')
salt = bytes(BIP39_SALT_MODIFIER + passphrase, 'utf8')
return hashlib.pbkdf2_hmac('sha512', mnemonic, salt, BIP39_PBKDF2_ROUNDS)
def bip39seed_to_bip32masternode(seed):
k = seed
h = hmac.new(BIP32_SEED_MODIFIER, seed, hashlib.sha512).digest()
key, chain_code = h[:32], h[32:]
return key, chain_code
def derive_bip32childkey(parent_key, parent_chain_code, i):
assert len(parent_key) == 32
assert len(parent_chain_code) == 32
k = parent_chain_code
if (i & BIP32_PRIVDEV) != 0:
key = b'\x00' + parent_key
else:
key = bytes(PublicKey(parent_key))
d = key + struct.pack('>L', i)
while True:
h = hmac.new(k, d, hashlib.sha512).digest()
key, chain_code = h[:32], h[32:]
a = int.from_bytes(key, byteorder='big')
b = int.from_bytes(parent_key, byteorder='big')
key = (a + b) % BIP32_CURVE.order
if a < BIP32_CURVE.order and key != 0:
key = key.to_bytes(32, byteorder='big')
break
d = b'\x01' + h[32:] + struct.pack('>L', i)
return key, chain_code
def parse_derivation_path(str_derivation_path):
path = []
if str_derivation_path[0:2] != 'm/':
raise ValueError("Can't recognize derivation path. It should look like \"m/44'/60/0'/0\".")
for i in str_derivation_path.lstrip('m/').split('/'):
if "'" in i:
path.append(BIP32_PRIVDEV + int(i[:-1]))
else:
path.append(int(i))
return path
def mnemonic_to_private_key(mnemonic, str_derivation_path, passphrase=""):
derivation_path = parse_derivation_path(str_derivation_path)
bip39seed = mnemonic_to_bip39seed(mnemonic, passphrase)
master_private_key, master_chain_code = bip39seed_to_bip32masternode(bip39seed)
private_key, chain_code = master_private_key, master_chain_code
for i in derivation_path:
private_key, chain_code = derive_bip32childkey(private_key, chain_code, i)
return private_key
if __name__ == '__main__':
import sys
with open(sys.argv[1], 'r') as f:
mnemonic = ' '.join(f.read().split())
private_key = mnemonic_to_private_key(mnemonic,
str_derivation_path=f'{ETH_DERIVATION_PATH}/0')
public_key = PublicKey(private_key)
print(f'privkey: {binascii.hexlify(private_key).decode("utf-8")}')
print(f'pubkey: {binascii.hexlify(bytes(public_key)).decode("utf-8")}')
print(f'address: {public_key.address()}')
