/**
* Create KeyStore and add a self-signed X.509 Certificate
*
* @param dname the X.509 Distinguished Name, eg "CN=www.google.co.uk, O=\"Google Inc\",
* L=\"Mountain View\", S=California, C=US"
* @param keyAlgorithmName the key algorithm, eg "RSA"
*/
private static KeyStore generateCertificate(
String alias,
char[] keyStorePassword,
KeyAlgorithmName keyAlgorithmName,
String dname,
String... sanDomains)
throws GeneralSecurityException, IOException {
CertAndKeyGen certAndKeyGen =
new CertAndKeyGen(
keyAlgorithmName.name(), keyAlgorithmName.signatureAlgorithmName, "SunCertificates");
certAndKeyGen.generate(keyAlgorithmName.keySize);
PrivateKey privateKey = certAndKeyGen.getPrivateKey();
X509CertInfo info = new X509CertInfo();
Date from = new Date();
Date to = new Date(from.getTime() + TimeUnit.DAYS.toMillis(360));
CertificateValidity interval = new CertificateValidity(from, to);
BigInteger sn = new BigInteger(64, new SecureRandom());
X500Name owner = new X500Name(dname);
info.set(X509CertInfo.VALIDITY, interval);
info.set(X509CertInfo.SERIAL_NUMBER, new CertificateSerialNumber(sn));
info.set(X509CertInfo.SUBJECT, new CertificateSubjectName(owner));
info.set(X509CertInfo.ISSUER, new CertificateIssuerName(owner));
info.set(X509CertInfo.KEY, new CertificateX509Key(certAndKeyGen.getPublicKey()));
info.set(X509CertInfo.VERSION, new CertificateVersion(CertificateVersion.V3));
info.set(
X509CertInfo.ALGORITHM_ID,
new CertificateAlgorithmId(new AlgorithmId(AlgorithmId.md5WithRSAEncryption_oid)));
// add subject alternative names
GeneralNames generalNames = new GeneralNames();
for (String sanDomain : sanDomains) {
generalNames.add(new GeneralName(new DNSName(sanDomain)));
}
if (generalNames.size() > 0) {
CertificateExtensions certificateExtensions =
(CertificateExtensions) info.get(X509CertInfo.EXTENSIONS);
if (certificateExtensions == null) certificateExtensions = new CertificateExtensions();
certificateExtensions.set(
SubjectAlternativeNameExtension.NAME, new SubjectAlternativeNameExtension(generalNames));
info.set(X509CertInfo.EXTENSIONS, certificateExtensions);
}
// Sign the certificate to identify the algorithm that's used.
X509CertImpl x509Certificate = new X509CertImpl(info);
x509Certificate.sign(privateKey, keyAlgorithmName.signatureAlgorithmName);
// update the algorithm, and resign.
info.set(
CertificateAlgorithmId.NAME + "." + CertificateAlgorithmId.ALGORITHM,
x509Certificate.get(X509CertImpl.SIG_ALG));
x509Certificate = new X509CertImpl(info);
x509Certificate.sign(privateKey, keyAlgorithmName.signatureAlgorithmName);
// add to new key store
KeyStore keyStore = KeyStore.getInstance(KeyStore.getDefaultType());
keyStore.load(null, keyStorePassword);
keyStore.setKeyEntry(
alias, privateKey, keyStorePassword, new X509Certificate[] {x509Certificate});
return keyStore;
}
