def derive_xkey(xkey, *path_level, base58=True, hex=False):
"""
Child Key derivation for extended private/public keys
:param bytes xkey: extended private/public in base58, HEX or bytes string format.
:param list path_level: list of derivation path levels. For hardened derivation use HARDENED_KEY flag.
:param boolean base58: (optional) return result as base58 encoded string, by default True.
:param boolean hex: (optional) return result as HEX encoded string, by default False.
In case True base58 flag value will be ignored.
:return: extended child private/public key in base58, HEX or bytes string format.
"""
xkey = decode_base58_with_checksum(xkey)
if xkey[:4] in [MAINNET_XPRIVATE_KEY_PREFIX, TESTNET_XPRIVATE_KEY_PREFIX]:
for i in path_level:
xkey = derive_child_xprivate_key(xkey, i)
elif xkey[:4] in [MAINNET_XPUBLIC_KEY_PREFIX, TESTNET_XPUBLIC_KEY_PREFIX]:
for i in path_level:
xkey = derive_child_xpublic_key(xkey, i)
else:
raise ValueError("invalid extended key")
if hex:
return xkey.hex()
elif base58:
return encode_base58_with_checksum(xkey)
else:
return xkey
def private_from_xprivate_key(xprivate_key, wif=True, hex=False):
"""
Get private key from extended private key
:param bytes xprivate_key: extended public in base58, HEX or bytes string format.
:param boolean wif: (optional) return result as WIF format, by default True.
:param boolean hex: (optional) return result as HEX encoded string, by default False.
In case True WIF flag value will be ignored.
:return: private key in HEX or bytes string format.
"""
if isinstance(xprivate_key, str):
if len(xprivate_key) == 156:
xprivate_key = bytes.fromhex(xprivate_key)
else:
xprivate_key = decode_base58_with_checksum(xprivate_key)
if not isinstance(xprivate_key, bytes):
raise TypeError("xprivate_key should be HEX, Base58 or bytes string")
if xprivate_key[:4] not in [
MAINNET_XPRIVATE_KEY_PREFIX, TESTNET_XPRIVATE_KEY_PREFIX
]:
raise ValueError("invalid extended private key")
if hex:
return xprivate_key[46:].hex()
elif wif:
if xprivate_key[:4] == MAINNET_XPRIVATE_KEY_PREFIX:
testnet = False
else:
testnet = True
return private_key_to_wif(xprivate_key[46:], testnet=testnet)
return xprivate_key[46:].hex() if hex else xprivate_key[46:]
def is_xpublic_key_valid(key):
"""
Check the extended private key is valid according to BIP-0032.
:param key: extended private key in BASE58, HEX or bytes string format.
:return: boolean.
"""
if isinstance(key, str):
try:
key = decode_base58_with_checksum(key)
except:
try:
key = bytes.fromhex(key)
except:
pass
if not isinstance(key, bytes) or len(key) != 78:
return False
if key[:4] not in [MAINNET_XPUBLIC_KEY_PREFIX, TESTNET_XPUBLIC_KEY_PREFIX]:
return False
return True
def xprivate_to_xpublic_key(xprivate_key, base58=True, hex=False):
"""
Get extended public key from extended private key using ECDSA secp256k1
:param str,bytes key: extended private key in base58, HEX or bytes string.
:param boolean base58: (optional) return result as base58 encoded string, by default True.
:param boolean hex: (optional) return result as HEX encoded string, by default False.
In case True base58 flag value will be ignored.
:return: extended public key in base58, HEX or bytes string format.
"""
if isinstance(xprivate_key, str):
try:
if len(xprivate_key) == 156:
xprivate_key = bytes.fromhex(xprivate_key)
else:
xprivate_key = decode_base58_with_checksum(xprivate_key)
except:
raise ValueError("invalid extended private key")
if not isinstance(xprivate_key, bytes):
raise TypeError(
"extended private key should be base58 string or bytes")
if xprivate_key[:4] == TESTNET_XPRIVATE_KEY_PREFIX:
prefix = TESTNET_XPUBLIC_KEY_PREFIX
elif xprivate_key[:4] == MAINNET_XPRIVATE_KEY_PREFIX:
prefix = MAINNET_XPUBLIC_KEY_PREFIX
else:
raise ValueError("invalid extended private key")
key = b"".join([
prefix, xprivate_key[4:45],
private_to_public_key(xprivate_key[46:], hex=False)
])
if hex:
return key.hex()
elif base58:
key = b"".join([key, double_sha256(key)[:4]])
return encode_base58(key)
else:
return key
def public_from_xpublic_key(xpublic_key, hex=True):
"""
Get public key from extended public key
:param bytes xpublic_key: extended public in base58, HEX or bytes string format.
:param boolean base58: (optional) return result as base58 encoded string, by default True.
:param boolean hex: (optional) return result as HEX encoded string, by default False.
In case True base58 flag value will be ignored.
:return: public key in HEX or bytes string format.
"""
if isinstance(xpublic_key, str):
if len(xpublic_key) == 156:
xpublic_key = bytes.fromhex(xpublic_key)
else:
xpublic_key = decode_base58_with_checksum(xpublic_key)
if not isinstance(xpublic_key, bytes):
raise TypeError("xpublic_key should be HEX, Base58 or bytes string")
if xpublic_key[:4] not in [
MAINNET_XPUBLIC_KEY_PREFIX, TESTNET_XPUBLIC_KEY_PREFIX
]:
raise ValueError("invalid extended public key")
return xpublic_key[45:].hex() if hex else xpublic_key[45:]