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/*
 * Copyright (C) 2020 Graylog, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the Server Side Public License, version 1,
 * as published by MongoDB, Inc.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * Server Side Public License for more details.
 *
 * You should have received a copy of the Server Side Public License
 * along with this program. If not, see
 * .
 */
package org.graylog.security.certutil.csr;

import java.nio.charset.StandardCharsets;
import java.security.GeneralSecurityException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;

import static org.graylog.security.certutil.CertConstants.SIGNING_ALGORITHM;

public class KeyPairChecker {

    private static final String SAMPLE_CHALLANGE = "Grayloggers! Grayloggers! Grayloggers! Grayloggers!";

    public boolean matchingKeys(final PrivateKey privateKey,
                                final PublicKey publicKey) throws GeneralSecurityException {
        Signature sign = Signature.getInstance(SIGNING_ALGORITHM);

        byte[] bytes = SAMPLE_CHALLANGE.getBytes(StandardCharsets.UTF_8);

        sign.initSign(privateKey);
        sign.update(bytes);
        byte[] signature = sign.sign();

        sign.initVerify(publicKey);
        sign.update(bytes);
        return sign.verify(signature);
    }

}