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import java.io.OutputStreamWriter;
import java.math.BigInteger;
import java.security.InvalidKeyException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchProviderException;
import java.security.SecureRandom;
import java.security.Security;
import java.security.SignatureException;
import java.security.cert.X509Certificate;
import java.util.Date;
import java.util.Enumeration;
import javax.security.auth.x500.X500Principal;
import org.bouncycastle.asn1.ASN1Set;
import org.bouncycastle.asn1.DERObjectIdentifier;
import org.bouncycastle.asn1.pkcs.Attribute;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.ExtendedKeyUsage;
import org.bouncycastle.asn1.x509.KeyPurposeId;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.asn1.x509.X509Extension;
import org.bouncycastle.asn1.x509.X509Extensions;
import org.bouncycastle.jce.PKCS10CertificationRequest;
import org.bouncycastle.openssl.PEMWriter;
import org.bouncycastle.x509.X509V1CertificateGenerator;
import org.bouncycastle.x509.X509V3CertificateGenerator;
import org.bouncycastle.x509.extension.AuthorityKeyIdentifierStructure;
import org.bouncycastle.x509.extension.SubjectKeyIdentifierStructure;
public class MainClass {
public static KeyPair generateRSAKeyPair() throws Exception {
KeyPairGenerator kpGen = KeyPairGenerator.getInstance("RSA", "BC");
kpGen.initialize(1024, new SecureRandom());
return kpGen.generateKeyPair();
}
public static PKCS10CertificationRequest generateRequest(KeyPair pair) throws Exception {
return new PKCS10CertificationRequest("SHA256withRSA", new X500Principal(
"CN=Requested Test Certificate"), pair.getPublic(), null, pair.getPrivate());
}
public static X509Certificate generateV1Certificate(KeyPair pair) throws InvalidKeyException,
NoSuchProviderException, SignatureException {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis()));
certGen.setIssuerDN(new X500Principal("CN=Test Certificate"));
certGen.setNotBefore(new Date(System.currentTimeMillis() - 10000));
certGen.setNotAfter(new Date(System.currentTimeMillis() + 10000));
certGen.setSubjectDN(new X500Principal("CN=Test Certificate"));
certGen.setPublicKey(pair.getPublic());
certGen.setSignatureAlgorithm("SHA256WithRSAEncryption");
return certGen.generateX509Certificate(pair.getPrivate(), "BC");
}
public static X509Certificate[] buildChain() throws Exception {
KeyPair pair = generateRSAKeyPair();
PKCS10CertificationRequest request = generateRequest(pair);
KeyPair rootPair = generateRSAKeyPair();
X509Certificate rootCert = generateV1Certificate(rootPair);
X509V3CertificateGenerator certGen = new X509V3CertificateGenerator();
certGen.setSerialNumber(BigInteger.valueOf(System.currentTimeMillis()));
certGen.setIssuerDN(rootCert.getSubjectX500Principal());
certGen.setNotBefore(new Date(System.currentTimeMillis()));
certGen.setNotAfter(new Date(System.currentTimeMillis() + 10000));
certGen.setSubjectDN(request.getCertificationRequestInfo().getSubject());
certGen.setPublicKey(request.getPublicKey("BC"));
certGen.setSignatureAlgorithm("SHA256WithRSAEncryption");
certGen.addExtension(X509Extensions.AuthorityKeyIdentifier, false,
new AuthorityKeyIdentifierStructure(rootCert));
certGen.addExtension(X509Extensions.SubjectKeyIdentifier,
false, new SubjectKeyIdentifierStructure(request.getPublicKey("BC")));
certGen.addExtension(X509Extensions.BasicConstraints, true, new BasicConstraints(false));
certGen.addExtension(X509Extensions.KeyUsage, true, new KeyUsage(KeyUsage.digitalSignature
| KeyUsage.keyEncipherment));
certGen.addExtension(X509Extensions.ExtendedKeyUsage, true, new ExtendedKeyUsage(
KeyPurposeId.id_kp_serverAuth));
ASN1Set attributes = request.getCertificationRequestInfo().getAttributes();
for (int i = 0; i != attributes.size(); i++) {
Attribute attr = Attribute.getInstance(attributes.getObjectAt(i));
if (attr.getAttrType().equals(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest)) {
X509Extensions extensions = X509Extensions.getInstance(attr.getAttrValues().getObjectAt(0));
Enumeration e = extensions.oids();
while (e.hasMoreElements()) {
DERObjectIdentifier oid = (DERObjectIdentifier) e.nextElement();
X509Extension ext = extensions.getExtension(oid);
certGen.addExtension(oid, ext.isCritical(), ext.getValue().getOctets());
}
}
}
X509Certificate issuedCert = certGen.generateX509Certificate(rootPair.getPrivate());
return new X509Certificate[] { issuedCert, rootCert };
}
public static void main(String[] args) throws Exception {
Security.addProvider(new org.bouncycastle.jce.provider.BouncyCastleProvider());
X509Certificate[] chain = buildChain();
PEMWriter pemWrt = new PEMWriter(new OutputStreamWriter(System.out));
pemWrt.writeObject(chain[0]);
pemWrt.writeObject(chain[1]);
pemWrt.close();
}
}
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