http://www.bouncycastle.org/java.html: The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5. 
public final class org.bouncycastle.jce.provider.symmetric.Skipjack
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.bouncycastle.jce.provider.symmetric.Skipjack
  super_class: java.lang.Object
{
  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.provider.symmetric.Skipjack this
         0: .line 16
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 18
            return
        end local 0 // org.bouncycastle.jce.provider.symmetric.Skipjack this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/jce/provider/symmetric/Skipjack;
}
SourceFile: "Skipjack.java"
NestMembers:
  org.bouncycastle.jce.provider.symmetric.Skipjack$AlgParams  org.bouncycastle.jce.provider.symmetric.Skipjack$ECB  org.bouncycastle.jce.provider.symmetric.Skipjack$KeyGen  org.bouncycastle.jce.provider.symmetric.Skipjack$Mac  org.bouncycastle.jce.provider.symmetric.Skipjack$MacCFB8  org.bouncycastle.jce.provider.symmetric.Skipjack$Mappings
InnerClasses:
  public AlgParams = org.bouncycastle.jce.provider.symmetric.Skipjack$AlgParams of org.bouncycastle.jce.provider.symmetric.Skipjack
  public ECB = org.bouncycastle.jce.provider.symmetric.Skipjack$ECB of org.bouncycastle.jce.provider.symmetric.Skipjack
  public KeyGen = org.bouncycastle.jce.provider.symmetric.Skipjack$KeyGen of org.bouncycastle.jce.provider.symmetric.Skipjack
  public Mac = org.bouncycastle.jce.provider.symmetric.Skipjack$Mac of org.bouncycastle.jce.provider.symmetric.Skipjack
  public MacCFB8 = org.bouncycastle.jce.provider.symmetric.Skipjack$MacCFB8 of org.bouncycastle.jce.provider.symmetric.Skipjack
  public Mappings = org.bouncycastle.jce.provider.symmetric.Skipjack$Mappings of org.bouncycastle.jce.provider.symmetric.Skipjack