certGen.setNotAfter(new Date(System.currentTimeMillis() + 50000));
certGen.setSubjectDN(new X509Principal(attrs));
certGen.setPublicKey(pubKey);
certGen.setSignatureAlgorithm("MD5WithRSAEncryption");
certGen.addExtension("2.5.29.15", true,
new X509KeyUsage(X509KeyUsage.encipherOnly));
certGen.addExtension("2.5.29.37", true,
new DERSequence(KeyPurposeId.anyExtendedKeyUsage));
certGen.addExtension("2.5.29.17", true,
new GeneralNames(new GeneralName(GeneralName.rfc822Name, "test@test.test")));