private function decryptWithPrivateKey($cipher, OpenSslRsaKey $privateKey)
    {
        $decrypted = '';
        $key = openssl_pkey_get_private($privateKey->getKeyString());
        if (openssl_private_decrypt($cipher, $decrypted, $key, $this->paddingAlgorithm) === false) {
            // Fallback for data that was encrypted with old default OPENSSL_PKCS1_PADDING
            if ($this->paddingAlgorithm !== OPENSSL_PKCS1_PADDING) {
                if (openssl_private_decrypt($cipher, $decrypted, $key, OPENSSL_PKCS1_PADDING) !== false) {
                    return $decrypted;
                }
            }
            $openSslErrors = [];
            while (($errorMessage = openssl_error_string()) !== false) {
                $openSslErrors[] = $errorMessage;
            }
            throw new SecurityException(sprintf('Decryption failed, OpenSSL error: %s', implode(chr(10), $openSslErrors)), 1556609762);
        }

        return $decrypted;
    }