publicKey = $publicKey; $this->privateKey = $privateKey; } /** * Retrieves the public key associated with this instance. * * @return string The public key. */ public function getPublicKey(): string { return $this->publicKey; } /** * Retrieves the private key associated with the instance. * * @return string The private key as a string. */ public function getPrivateKey(): string { return $this->privateKey; } }