SAML2\SignedElementHelper::getSignatureKey PHP Method

Retrieve the private key we should use to sign the message.

public getSignatureKey ( ) : XMLSecurityKey \| null
return	RobRichards\XMLSecLibs\XMLSecurityKey \| null	The key, or NULL if no key is specified.

    public function getSignatureKey()
    {
        return $this->signatureKey;
    }

SignedElementHelper