Python itsdangerous 模块，Signer() 实例源码

def compat_sign(digest_method, key, message):
    """Sign message using old itsdangerous signer."""
    return itsdangerous.Signer(
        key, digest_method=get_digest(digest_method),
    ).get_signature(message)

def param_signer(self):
        return Signer(self.config['SECRET_KEY'])

def get_signer():
    return Signer(current_app.secret_key, salt='wrath-ctf')

def _get_signer(app):
        if not app.secret_key:
            return None
        return Signer(app.secret_key, salt='flask-sessions',
                      key_derivation='hmac')

def _get_signer(self, app):
        if not app.secret_key:
            return None
        return Signer(app.secret_key, salt='flask-session', key_derivation='hmac')