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/*
* Copyright (C) 2014 Andrew Comminos
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* 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
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package se.lublin.humla.net;
import org.spongycastle.asn1.x500.X500Name;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.cert.X509CertificateHolder;
import org.spongycastle.cert.X509v3CertificateBuilder;
import org.spongycastle.cert.jcajce.JcaX509CertificateConverter;
import org.spongycastle.jce.provider.BouncyCastleProvider;
import org.spongycastle.operator.ContentSigner;
import org.spongycastle.operator.OperatorCreationException;
import org.spongycastle.operator.jcajce.JcaContentSignerBuilder;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.KeyStore;
import java.security.KeyStoreException;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;
import java.util.Calendar;
import java.util.Date;
public class HumlaCertificateGenerator {
private static final String ISSUER = "CN=Humla Client";
private static final Integer YEARS_VALID = 20;
public static X509Certificate generateCertificate(OutputStream output) throws NoSuchAlgorithmException, OperatorCreationException, CertificateException, KeyStoreException, NoSuchProviderException, IOException {
BouncyCastleProvider provider = new BouncyCastleProvider(); // Use SpongyCastle provider, supports creating X509 certs
KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
generator.initialize(2048, new SecureRandom());
KeyPair keyPair = generator.generateKeyPair();
SubjectPublicKeyInfo publicKeyInfo = SubjectPublicKeyInfo.getInstance(keyPair.getPublic().getEncoded());
ContentSigner signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider(provider).build(keyPair.getPrivate());
Date startDate = new Date();
Calendar calendar = Calendar.getInstance();
calendar.setTime(startDate);
calendar.add(Calendar.YEAR, YEARS_VALID);
Date endDate = calendar.getTime();
X509v3CertificateBuilder certBuilder = new X509v3CertificateBuilder(new X500Name(ISSUER),
BigInteger.ONE,
startDate, endDate, new X500Name(ISSUER),
publicKeyInfo);
X509CertificateHolder certificateHolder = certBuilder.build(signer);
X509Certificate certificate = new JcaX509CertificateConverter().setProvider(provider).getCertificate(certificateHolder);
KeyStore keyStore = KeyStore.getInstance("PKCS12", provider);
keyStore.load(null, null);
keyStore.setKeyEntry("Humla Key", keyPair.getPrivate(), null, new X509Certificate[] { certificate });
keyStore.store(output, "".toCharArray());
return certificate;
}
}
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