How to generate public and private key pairs from the 12 seed words in python

Question

I basically followed the instructions here How to generate mycelium addresses from the 12 words in python

So my code is similar:

from bip32utils import BIP32Key
from bip32utils import BIP32_HARDEN
from bip32utils import Base58
import os, bip39

strength_bits = 128
entropy = os.urandom(strength_bits // 8)
wallet_generator = bip39.Mnemonic('english')
mnemonic = wallet_generator.to_mnemonic(entropy)
assert wallet_generator.to_entropy(mnemonic) == entropy  # see, bijective!

# Or specify the mnemonic directly if you prefer:
mnemonic = 'aware report movie exile buyer drum poverty supreme gym oppose float elegant'
passphrase = 'test'

seed = bip39.Mnemonic.to_seed(mnemonic, passphrase=passphrase)
key = BIP32Key.fromEntropy(seed)
account_number = 0
i = 0
print "Address: " + key.ChildKey(44 + BIP32_HARDEN) \
         .ChildKey(0 + BIP32_HARDEN) \
         .ChildKey(account_number + BIP32_HARDEN) \
         .ChildKey(0) \
         .ChildKey(i) \
         .Address()

And I verified it using https://iancoleman.io/bip39/#english that the generated address is indeed the first address that this webpage generated as well. However, I also want to get the public and private key pairs using this same library. I originally tried:

print "Public Key: " + Base58.check_encode(key.ChildKey(44 + BIP32_HARDEN) \
         .ChildKey(0 + BIP32_HARDEN) \
         .ChildKey(account_number + BIP32_HARDEN) \
         .ChildKey(0) \
         .ChildKey(i) \
         .PublicKey())

print "Private Key: " + Base58.check_encode(key.ChildKey(44 + BIP32_HARDEN) \
         .ChildKey(0 + BIP32_HARDEN) \
         .ChildKey(account_number + BIP32_HARDEN) \
         .ChildKey(0) \
         .ChildKey(i) \
         .PrivateKey())

However, the output of these two calls are not the same as the ones provided by the website above for the same address.

So my question is: what's the proper way for me to generate the public and private key pairs?

Edit: To clarify, for the exact mnemonic and passphrase above, the website I'm using for reference tells me the first address and keypair should be:

While the output of the above python code is:

Address: 1K6WQtD7bLQ5nQ14GyBV33mBWSbkiRKhQs
Public Key: 62Yi9HBYYagf8CY1Ve2fquHKjBqAA7GFjGUUtkUHbkP5PHzv3W
Private Key: EGHMsAp7nY7Jo9F589zCU227KBLTDhiwRq5vYVvRVZxJNPJn4

So the address matches, but not the keypair.

Answer 1

Please try the following demo, and the result is same with https://iancoleman.io/bip39/.

$ python3.6 test.py
{'addr': '1A9vZ4oPLb29szfRWVFe1VoEe7a2qEMjvJ',
 'coin': 'BTC',
 'mnemonic_words': 'aware report movie exile buyer drum poverty supreme gym oppose float elegant',
 'privatekey': 'L3g3hhYabnBFbGqd7qReebwCrRkGhAzaX4cBpYSv5S667sWJAn5A',
 'publickey': '029dc2912196f2ad7a830747c2490287e4ff3ea52c417598681a955dcdf473b6c0'}

---

#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import pprint
import binascii
import mnemonic
import bip32utils

def bip39(mnemonic_words):
    mobj = mnemonic.Mnemonic("english")
    seed = mobj.to_seed(mnemonic_words)

    bip32_root_key_obj = bip32utils.BIP32Key.fromEntropy(seed)
    bip32_child_key_obj = bip32_root_key_obj.ChildKey(
        44 + bip32utils.BIP32_HARDEN
    ).ChildKey(
        0 + bip32utils.BIP32_HARDEN
    ).ChildKey(
        0 + bip32utils.BIP32_HARDEN
    ).ChildKey(0).ChildKey(0)

    # return {
    #     'mnemonic_words': mnemonic_words,
    #     'bip32_root_key': bip32_root_key_obj.ExtendedKey(),
    #     'bip32_extended_private_key': bip32_child_key_obj.ExtendedKey(),
    #     'bip32_derivation_path': "m/44'/0'/0'/0",
    #     'bip32_derivation_addr': bip32_child_key_obj.Address(),
    #     'coin': 'BTC'
    # }

    return {
        'mnemonic_words': mnemonic_words,
        # 'bip32_root_key': bip32_root_key_obj.ExtendedKey(),
        # 'bip32_extended_private_key': bip32_child_key_obj.ExtendedKey(),
        # 'path': "m/44'/0'/0'/0",
        'addr': bip32_child_key_obj.Address(),
        'publickey': binascii.hexlify(bip32_child_key_obj.PublicKey()).decode(),
        'privatekey': bip32_child_key_obj.WalletImportFormat(),
        'coin': 'BTC'
    }


if __name__ == '__main__':
    mnemonic_words = "aware report movie exile buyer drum poverty supreme gym oppose float elegant"
    pprint.pprint(bip39(mnemonic_words))

Answer 2

I found the problem I think.

You should not do the Base58.check_encode

To print the PublicKey, use the .hex() method.

Also, https://iancoleman.io/bip39/#english print Private key in the WIF form so you should do .WalletImportFormat() instead of .PrivateKey() if you want do have the same output as iancoleman.io . This time, no need to use .hex() (again no need to encode in base58)

Answer 3

The public key should be in hex as @MohamedLEGH pointed out above. Regarding the private key you have to append the network code to it first. See step 2 here.