certGen.setSubjectDN(new X509Principal(attrs));
certGen.setPublicKey(pubKey);
certGen.setSignatureAlgorithm(algorithm);
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")));
X509Certificate baseCert = certGen.generate(privKey, "BC");