def derivation(self, chain_code: bytes,
child_index: int) -> Tuple["Secp256k1Deriv", bytes]:
if child_index < 0 or child_index >= 2**31:
raise Exception("invalid child index")
I = utils.hmac512(chain_code,
self.get_public_bytes() + utils.tb(child_index, 4))
return (self.__class__(self.derive(Secp256k1Priv(I[0:32]))), I[32:])
def hardened_derivation(self, chain_code: bytes,
child_index: int) -> Tuple["ED25519Priv", bytes]:
if child_index < 0 or child_index >= 2**31:
raise Exception("invalid hardened child index")
I = utils.hmac512(
chain_code, b"\x00" + self.get_private_bytes() +
utils.tb(child_index + 0x80000000, 4))
return (ED25519Priv(I[0:32]), I[32:])
def from_seed_ed25519(cls, seed: bytes) -> "XKey":
I = utils.hmac512(b"ed25519 seed", seed)
return XKey(Version.PRIVATE, 0, b"\x00\x00\x00\x00", 0, False, I[32:],
ED25519Priv(I[0:32]))
def from_seed(cls, seed: bytes) -> "XKey":
I = utils.hmac512(b"Bitcoin seed", seed)
return XKey(Version.PRIVATE, 0, b"\x00\x00\x00\x00", 0, False, I[32:],
Secp256k1Priv(I[0:32]))
