util.py 文件源码

def rsa_sign(private_key, message):
    """Signs a message with the provided Rsa private key.

    Args:
        private_key (str): Rsa private key with BEGIN and END sections.
        message (str): Message to be hashed and signed.

    Returns:
        str: Hex signature of the message, with its leading 0x stripped.
    """
    private_rsa = load_pem_private_key(bytes(private_key), password=None, backend=default_backend())
    hashed = sha256(message)
    signature = private_rsa.sign(
        hashed,
        padding.PSS(
            mgf=padding.MGF1(hashes.SHA256()),
            salt_length=padding.PSS.MAX_LENGTH
        ),
        hashes.SHA256()
    )
    return binascii.hexlify(bytearray(signature))