public String getSigAlgName() {
   if (sigAlgId.equals(ID_DSA_WITH_SHA1)) {
     return "SHA1withDSA";
   }
   if (sigAlgId.equals(ID_RSA_WITH_MD2)) {
     return "MD2withRSA";
   }
   if (sigAlgId.equals(ID_RSA_WITH_MD5)) {
     return "MD5withRSA";
   }
   if (sigAlgId.equals(ID_RSA_WITH_SHA1)) {
     return "SHA1withRSA";
   }
   return "unknown";
 }