import hmac
import hashlib


def get_signature(message, secret):
    """Return a SHA256 signature for the message."""
    digest = hmac.new(
        secret.encode("utf-8"),
        msg=message.encode("utf-8"),
        digestmod=hashlib.sha256,
    ).hexdigest()
    return f"SIG-HMAC-SHA256 {digest:s}"