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The Netty project is an effort to provide an asynchronous event-driven network application framework and tools for rapid development of maintainable high performance and high scalability protocol servers and clients. In other words, Netty is a NIO client server framework which enables quick and easy development of network applications such as protocol servers and clients. It greatly simplifies and streamlines network programming such as TCP and UDP socket server.

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/*
 * Copyright 2014 The Netty Project
 *
 * The Netty Project licenses this file to you under the Apache License,
 * version 2.0 (the "License"); you may not use this file except in compliance
 * with the License. You may obtain a copy of the License at:
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations
 * under the License.
 */

package org.jboss.netty.handler.ssl.util;

import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.X509v3CertificateBuilder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.cert.jcajce.JcaX509v3CertificateBuilder;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;

import java.math.BigInteger;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;

import static org.jboss.netty.handler.ssl.util.SelfSignedCertificate.*;

/**
 * Generates a self-signed certificate using Bouncy Castle.
 */
final class BouncyCastleSelfSignedCertGenerator {

    private static final Provider PROVIDER = new BouncyCastleProvider();

    static String[] generate(String fqdn, KeyPair keypair, SecureRandom random) throws Exception {
        PrivateKey key = keypair.getPrivate();

        // Prepare the information required for generating an X.509 certificate.
        X500Name owner = new X500Name("CN=" + fqdn);
        X509v3CertificateBuilder builder = new JcaX509v3CertificateBuilder(
                owner, new BigInteger(64, random), NOT_BEFORE, NOT_AFTER, owner, keypair.getPublic());

        ContentSigner signer = new JcaContentSignerBuilder("SHA256WithRSAEncryption").build(key);
        X509CertificateHolder certHolder = builder.build(signer);
        X509Certificate cert = new JcaX509CertificateConverter().setProvider(PROVIDER).getCertificate(certHolder);
        cert.verify(keypair.getPublic());

        return newSelfSignedCertificate(fqdn, key, cert);
    }

    private BouncyCastleSelfSignedCertGenerator() { }
}