function getPublicKey()
    {
        if (isset($this->publicKey)) {
            return $this->publicKey;
        }

        if (isset($this->currentCert) && is_array($this->currentCert)) {
            foreach (array('tbsCertificate/subjectPublicKeyInfo', 'certificationRequestInfo/subjectPKInfo') as $path) {
                $keyinfo = $this->_subArray($this->currentCert, $path);
                if (!empty($keyinfo)) {
                    break;
                }
            }
        }
        if (empty($keyinfo)) {
            return false;
        }

        $key = $keyinfo['subjectPublicKey'];

        switch ($keyinfo['algorithm']['algorithm']) {
            case 'rsaEncryption':
                $publicKey = new RSA();
                $publicKey->loadKey($key);
                $publicKey->setPublicKey();
                break;
            default:
                return false;
        }

        return $publicKey;
    }