def from_public_key(cls, public_key, chain_path='\x00'*32, depth=0,
fingerprint='\x00'*4, child_index=0):
public_key_bytes = encode_public_key(public_key, 'bin_compressed')
chain_path = extract_bin_chain_path(chain_path)
keychain_parts = (version_bytes, depth, fingerprint,
child_index, chain_path, public_key_bytes)
public_keychain_string = bip32_serialize(keychain_parts)
return PublicKeychain(public_keychain_string)
def derive_childkey(key, chaincode, prefix=bitcoin.MAINNET_PUBLIC):
"""
Given a 33 byte public key and 32 byte chaincode (both in hex) derive the first child key.
"""
master_key = bitcoin.bip32_serialize((prefix, 0, b"\x00" * 4, 0, unhexlify(chaincode), unhexlify(key)))
child_key = bitcoin.bip32_ckd(master_key, 0)
return bitcoin.bip32_extract_key(child_key)
def derive_childkey(key, chaincode, prefix=bitcoin.MAINNET_PUBLIC):
"""
Given a 33 byte public key and 32 byte chaincode (both in hex) derive the first child key.
"""
master_key = bitcoin.bip32_serialize((prefix, 0, b'\x00'*4, 0,
unhexlify(chaincode), unhexlify(key)))
child_key = bitcoin.bip32_ckd(master_key, 0)
return bitcoin.bip32_extract_key(child_key)
