public static void init() throws InstantiationException, IllegalAccessException, ClassNotFoundException {
if (!initialized) {
String bouncyCastleProviderClassName = "org.bouncycastle.jce.provider.BouncyCastleProvider";
Security.addProvider((Provider)Class.forName(bouncyCastleProviderClassName).newInstance());
MailcapCommandMap mailcap = (MailcapCommandMap) CommandMap.getDefaultCommandMap();
mailcap.addMailcap("application/pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_signature");
mailcap.addMailcap("application/pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.pkcs7_mime");
mailcap.addMailcap("application/x-pkcs7-signature;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_signature");
mailcap.addMailcap("application/x-pkcs7-mime;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.x_pkcs7_mime");
mailcap.addMailcap("multipart/signed;; x-java-content-handler=org.bouncycastle.mail.smime.handlers.multipart_signed");
CommandMap.setDefaultCommandMap(mailcap);
initialized = true;
} else {