https://openjdk.java.net/ 
public interface java.security.spec.KeySpec
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: java.security.spec.KeySpec
  super_class: java.lang.Object
{
}
SourceFile: "KeySpec.java"