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 class org.bouncycastle.jce.provider.JDKDigestSignature$MD4WithRSAEncryption extends org.bouncycastle.jce.provider.JDKDigestSignature
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.jce.provider.JDKDigestSignature$MD4WithRSAEncryption
  super_class: org.bouncycastle.jce.provider.JDKDigestSignature
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.provider.JDKDigestSignature$MD4WithRSAEncryption this
         0: .line 318
            aload 0 /* this */
            getstatic org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers.md4:Lorg/bouncycastle/asn1/ASN1ObjectIdentifier;
            new org.bouncycastle.crypto.digests.MD4Digest
            dup
            invokespecial org.bouncycastle.crypto.digests.MD4Digest.<init>:()V
            new org.bouncycastle.crypto.encodings.PKCS1Encoding
            dup
            new org.bouncycastle.crypto.engines.RSABlindedEngine
            dup
            invokespecial org.bouncycastle.crypto.engines.RSABlindedEngine.<init>:()V
            invokespecial org.bouncycastle.crypto.encodings.PKCS1Encoding.<init>:(Lorg/bouncycastle/crypto/AsymmetricBlockCipher;)V
            invokespecial org.bouncycastle.jce.provider.JDKDigestSignature.<init>:(Lorg/bouncycastle/asn1/DERObjectIdentifier;Lorg/bouncycastle/crypto/Digest;Lorg/bouncycastle/crypto/AsymmetricBlockCipher;)V
         1: .line 319
            return
        end local 0 // org.bouncycastle.jce.provider.JDKDigestSignature$MD4WithRSAEncryption this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/bouncycastle/jce/provider/JDKDigestSignature$MD4WithRSAEncryption;
}
SourceFile: "JDKDigestSignature.java"
NestHost: org.bouncycastle.jce.provider.JDKDigestSignature
InnerClasses:
  public MD4WithRSAEncryption = org.bouncycastle.jce.provider.JDKDigestSignature$MD4WithRSAEncryption of org.bouncycastle.jce.provider.JDKDigestSignature