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.crypto.generators.KDF2BytesGenerator extends org.bouncycastle.crypto.generators.BaseKDFBytesGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.crypto.generators.KDF2BytesGenerator
  super_class: org.bouncycastle.crypto.generators.BaseKDFBytesGenerator
{
  public void <init>(org.bouncycastle.crypto.Digest);
    descriptor: (Lorg/bouncycastle/crypto/Digest;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.bouncycastle.crypto.generators.KDF2BytesGenerator this
        start local 1 // org.bouncycastle.crypto.Digest digest
         0: .line 22
            aload 0 /* this */
            iconst_1
            aload 1 /* digest */
            invokespecial org.bouncycastle.crypto.generators.BaseKDFBytesGenerator.<init>:(ILorg/bouncycastle/crypto/Digest;)V
         1: .line 23
            return
        end local 1 // org.bouncycastle.crypto.Digest digest
        end local 0 // org.bouncycastle.crypto.generators.KDF2BytesGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    2     0    this  Lorg/bouncycastle/crypto/generators/KDF2BytesGenerator;
            0    2     1  digest  Lorg/bouncycastle/crypto/Digest;
    MethodParameters:
        Name  Flags
      digest  
}
SourceFile: "KDF2BytesGenerator.java"