from typing import *
def generate_secret() -> bytes:
    """
    Generate secret key.
    """
def publickey(secret_key: bytes) -> bytes:
    """
    Computes public key from secret key.
    """
def multiply(secret_key: bytes, public_key: bytes) -> bytes:
    """
    Multiplies point defined by public_key with scalar defined by
    secret_key. Useful for ECDH.
    """