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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:
    *
    *   https://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 io.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 java.util.Date;
  
  import static io.netty.handler.ssl.util.SelfSignedCertificate.newSelfSignedCertificate;
  
  /**
   * Generates a self-signed certificate using <a href="https://www.bouncycastle.org/">Bouncy Castle</a>.
   */
  final class BouncyCastleSelfSignedCertGenerator {
  
      private static final Provider PROVIDER = new BouncyCastleProvider();
  
      static String[] generate(String fqdn, KeyPair keypair, SecureRandom random, Date notBefore, Date notAfter,
                               String algorithm) 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), notBefore, notAfter, owner, keypair.getPublic());
  
          ContentSigner signer = new JcaContentSignerBuilder(
                  algorithm.equalsIgnoreCase("EC") ? "SHA256withECDSA" : "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() { }
  }