bip32 1.0

Minimalistic implementation of the BIP32 key derivation scheme

python-bip32

A basic implementation of the bip-0032.

Usage

>>> from bip32 import BIP32, HARDENED_INDEX
>>> bip32 = BIP32.from_seed(bytes.fromhex("01"))
# Specify the derivation path as a list ...
>>> bip32.get_xpriv_from_path([1, HARDENED_INDEX, 9998])
'xprv9y4sBgCuub5x2DtbdNBDDCZ3btybk8YZZaTvzV5rmYd3PbU63XLo2QEj6cUt4JAqpF8gJiRKFUW8Vm7thPkccW2DpUvBxASycypEHxmZzts'
# ... Or in usual m/the/path/
>>> bip32.get_xpriv_from_path("m/1/0'/9998")
'xprv9y4sBgCuub5x2DtbdNBDDCZ3btybk8YZZaTvzV5rmYd3PbU63XLo2QEj6cUt4JAqpF8gJiRKFUW8Vm7thPkccW2DpUvBxASycypEHxmZzts'
>>> bip32.get_xpub_from_path([HARDENED_INDEX, 42])
'xpub69uEaVYoN1mZyMon8qwRP41YjYyevp3YxJ68ymBGV7qmXZ9rsbMy9kBZnLNPg3TLjKd2EnMw5BtUFQCGrTVDjQok859LowMV2SEooseLCt1'
# You can also use "h" or "H" to signal for hardened derivation
>>> bip32.get_xpub_from_path("m/0h/42")
'xpub69uEaVYoN1mZyMon8qwRP41YjYyevp3YxJ68ymBGV7qmXZ9rsbMy9kBZnLNPg3TLjKd2EnMw5BtUFQCGrTVDjQok859LowMV2SEooseLCt1'
# You can use pubkey-only derivation
>>> bip32 = BIP32.from_xpub("xpub6AKC3u8URPxDojLnFtNdEPFkNsXxHfgRhySvVfEJy9SVvQAn14XQjAoFY48mpjgutJNfA54GbYYRpR26tFEJHTHhfiiZZ2wdBBzydVp12yU")
>>> bip32.get_xpub_from_path([42, 43])
'xpub6FL7T3s7GuVb4od1gvWuumhg47y6TZtf2DSr6ModQpX4UFGkQXw8oEVhJXcXJ4edmtAWCTrefD64B9RP4sYSkSumTW1wadTS3SYurBGYccT'
>>> bip32.get_xpub_from_path("m/42/43")
'xpub6FL7T3s7GuVb4od1gvWuumhg47y6TZtf2DSr6ModQpX4UFGkQXw8oEVhJXcXJ4edmtAWCTrefD64B9RP4sYSkSumTW1wadTS3SYurBGYccT'
>>> bip32.get_pubkey_from_path("m/1/1/1/1/1/1/1/1/1/1/1")
b'\x02\x0c\xac\n\xa8\x06\x96C\x8e\x9b\xcf\x83]\x0c\rCm\x06\x1c\xe9T\xealo\xa2\xdf\x195\xebZ\x9b\xb8\x9e'

Installation

pip install bip32

Dependencies

This uses coincurve as a wrapper for libsecp256k1 for EC operations.

Running the test suite

# From the root of the repository
python3 -m venv venv
. venv/bin/activate
pip install -r requirements.txt && pip install pytest
PYTHONPATH=$PYTHONPATH:$PWD/bip32 pytest -vvv

Interface

All public keys below are compressed.

All path below are a list of integers representing the index of the key at each depth.

BIP32

from_seed(seed)

classmethod

Instanciate from a raw seed (as bytes). See bip-0032's master key generation.

from_xpriv(xpriv)

classmethod

Instanciate with an encoded serialized extended private key (as str) as master.

from_xpub(xpub)

classmethod

Instanciate with an encoded serialized extended public key (as str) as master.

You'll only be able to derive unhardened public keys.

get_extended_privkey_from_path(path)

Returns (chaincode (bytes), privkey (bytes)) of the private key pointed by the path.

get_privkey_from_path(path)

Returns privkey (bytes), the private key pointed by the path.

get_extended_pubkey_from_path(path)

Returns (chaincode (bytes), pubkey (bytes)) of the public key pointed by the path.

Note that you don't need to have provided the master private key if the path doesn't include an index >= HARDENED_INDEX.

get_pubkey_from_path(path)

Returns pubkey (bytes), the public key pointed by the path.

Note that you don't need to have provided the master private key if the path doesn't include an index >= HARDENED_INDEX.

get_xpriv_from_path(path)

Returns xpriv (str) the serialized and encoded extended private key pointed by the given path.

get_xpub_from_path(path)

Returns xpub (str) the serialized and encoded extended public key pointed by the given path.

Note that you don't need to have provided the master private key if the path doesn't include an index >= HARDENED_INDEX.

get_master_xpriv(path)

Equivalent to get_xpriv_from_path([]).

get_master_xpub(path)

Equivalent to get_xpub_from_path([]).