'Verifies a message against a signature.
Args:
message: string, The message to verify.
signature: string, The signature on the message.
Returns:
True if message was singed by the private key associated with the public
key that this object was constructed with.'

def verify(self, message, signature):

    try:
        crypto.verify(self._pubkey, signature, message, 'sha256')
        return True
    except:
        return False
