1 files changed, 82 insertions, 0 deletions
diff --git a/src/main/java/se/lublin/humla/net/HumlaCertificateGenerator.java b/src/main/java/se/lublin/humla/net/HumlaCertificateGenerator.java
new file mode 100644
index 0000000..a7996c9
--- /dev/null
+++ b/src/main/java/se/lublin/humla/net/HumlaCertificateGenerator.java
@@ -0,0 +1,82 @@
+/*
+ * 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;
+	}
+}