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.BrokenKDF2BytesGenerator implements org.bouncycastle.crypto.DerivationFunction
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator
  super_class: java.lang.Object
{
  private org.bouncycastle.crypto.Digest digest;
    descriptor: Lorg/bouncycastle/crypto/Digest;
    flags: (0x0002) ACC_PRIVATE

  private byte[] shared;
    descriptor: [B
    flags: (0x0002) ACC_PRIVATE

  private byte[] iv;
    descriptor: [B
    flags: (0x0002) ACC_PRIVATE

  public void <init>(org.bouncycastle.crypto.Digest);
    descriptor: (Lorg/bouncycastle/crypto/Digest;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
        start local 1 // org.bouncycastle.crypto.Digest digest
         0: .line 34
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 37
            aload 0 /* this */
            aload 1 /* digest */
            putfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
         2: .line 38
            return
        end local 1 // org.bouncycastle.crypto.Digest digest
        end local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lorg/bouncycastle/jce/provider/BrokenKDF2BytesGenerator;
            0    3     1  digest  Lorg/bouncycastle/crypto/Digest;
    MethodParameters:
        Name  Flags
      digest  

  public void init(org.bouncycastle.crypto.DerivationParameters);
    descriptor: (Lorg/bouncycastle/crypto/DerivationParameters;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
        start local 1 // org.bouncycastle.crypto.DerivationParameters param
         0: .line 43
            aload 1 /* param */
            instanceof org.bouncycastle.crypto.params.KDFParameters
            ifne 2
         1: .line 45
            new java.lang.IllegalArgumentException
            dup
            ldc "KDF parameters required for KDF2Generator"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 48
      StackMap locals:
      StackMap stack:
            aload 1 /* param */
            checkcast org.bouncycastle.crypto.params.KDFParameters
            astore 2 /* p */
        start local 2 // org.bouncycastle.crypto.params.KDFParameters p
         3: .line 50
            aload 0 /* this */
            aload 2 /* p */
            invokevirtual org.bouncycastle.crypto.params.KDFParameters.getSharedSecret:()[B
            putfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.shared:[B
         4: .line 51
            aload 0 /* this */
            aload 2 /* p */
            invokevirtual org.bouncycastle.crypto.params.KDFParameters.getIV:()[B
            putfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.iv:[B
         5: .line 52
            return
        end local 2 // org.bouncycastle.crypto.params.KDFParameters p
        end local 1 // org.bouncycastle.crypto.DerivationParameters param
        end local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    6     0   this  Lorg/bouncycastle/jce/provider/BrokenKDF2BytesGenerator;
            0    6     1  param  Lorg/bouncycastle/crypto/DerivationParameters;
            3    6     2      p  Lorg/bouncycastle/crypto/params/KDFParameters;
    MethodParameters:
       Name  Flags
      param  

  public org.bouncycastle.crypto.Digest getDigest();
    descriptor: ()Lorg/bouncycastle/crypto/Digest;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
         0: .line 59
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            areturn
        end local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/bouncycastle/jce/provider/BrokenKDF2BytesGenerator;

  public int generateBytes(byte[], int, int);
    descriptor: ([BII)I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=9, args_size=4
        start local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
        start local 1 // byte[] out
        start local 2 // int outOff
        start local 3 // int len
         0: .line 75
            aload 1 /* out */
            arraylength
            iload 3 /* len */
            isub
            iload 2 /* outOff */
            if_icmpge 2
         1: .line 77
            new org.bouncycastle.crypto.DataLengthException
            dup
            ldc "output buffer too small"
            invokespecial org.bouncycastle.crypto.DataLengthException.<init>:(Ljava/lang/String;)V
            athrow
         2: .line 80
      StackMap locals:
      StackMap stack:
            iload 3 /* len */
            bipush 8
            imul
            i2l
            lstore 4 /* oBits */
        start local 4 // long oBits
         3: .line 88
            lload 4 /* oBits */
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            bipush 8
            imul
            i2l
            ldc 29
            lmul
            lcmp
            ifle 5
         4: .line 90
            new java.lang.IllegalArgumentException
            ldc "Output length to large"
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
         5: .line 93
      StackMap locals: long
      StackMap stack:
            lload 4 /* oBits */
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            i2l
            ldiv
            l2i
            istore 6 /* cThreshold */
        start local 6 // int cThreshold
         6: .line 95
            aconst_null
            astore 7 /* dig */
        start local 7 // byte[] dig
         7: .line 97
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            newarray 8
            astore 7 /* dig */
         8: .line 99
            iconst_1
            istore 8 /* counter */
        start local 8 // int counter
         9: goto 23
        10: .line 101
      StackMap locals: int byte[] int
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.shared:[B
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.shared:[B
            arraylength
            invokeinterface org.bouncycastle.crypto.Digest.update:([BII)V
        11: .line 103
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            iload 8 /* counter */
            sipush 255
            iand
            i2b
            invokeinterface org.bouncycastle.crypto.Digest.update:(B)V
        12: .line 104
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            iload 8 /* counter */
            bipush 8
            ishr
            sipush 255
            iand
            i2b
            invokeinterface org.bouncycastle.crypto.Digest.update:(B)V
        13: .line 105
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            iload 8 /* counter */
            bipush 16
            ishr
            sipush 255
            iand
            i2b
            invokeinterface org.bouncycastle.crypto.Digest.update:(B)V
        14: .line 106
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            iload 8 /* counter */
            bipush 24
            ishr
            sipush 255
            iand
            i2b
            invokeinterface org.bouncycastle.crypto.Digest.update:(B)V
        15: .line 108
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.iv:[B
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.iv:[B
            arraylength
            invokeinterface org.bouncycastle.crypto.Digest.update:([BII)V
        16: .line 110
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 7 /* dig */
            iconst_0
            invokeinterface org.bouncycastle.crypto.Digest.doFinal:([BI)I
            pop
        17: .line 112
            iload 3 /* len */
            iload 2 /* outOff */
            isub
            aload 7 /* dig */
            arraylength
            if_icmple 21
        18: .line 114
            aload 7 /* dig */
            iconst_0
            aload 1 /* out */
            iload 2 /* outOff */
            aload 7 /* dig */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        19: .line 115
            iload 2 /* outOff */
            aload 7 /* dig */
            arraylength
            iadd
            istore 2 /* outOff */
        20: .line 116
            goto 22
        21: .line 119
      StackMap locals:
      StackMap stack:
            aload 7 /* dig */
            iconst_0
            aload 1 /* out */
            iload 2 /* outOff */
            iload 3 /* len */
            iload 2 /* outOff */
            isub
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
        22: .line 99
      StackMap locals:
      StackMap stack:
            iinc 8 /* counter */ 1
      StackMap locals:
      StackMap stack:
        23: iload 8 /* counter */
            iload 6 /* cThreshold */
            if_icmple 10
        end local 8 // int counter
        24: .line 123
            aload 0 /* this */
            getfield org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.reset:()V
        25: .line 125
            iload 3 /* len */
            ireturn
        end local 7 // byte[] dig
        end local 6 // int cThreshold
        end local 4 // long oBits
        end local 3 // int len
        end local 2 // int outOff
        end local 1 // byte[] out
        end local 0 // org.bouncycastle.jce.provider.BrokenKDF2BytesGenerator this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0   26     0        this  Lorg/bouncycastle/jce/provider/BrokenKDF2BytesGenerator;
            0   26     1         out  [B
            0   26     2      outOff  I
            0   26     3         len  I
            3   26     4       oBits  J
            6   26     6  cThreshold  I
            7   26     7         dig  [B
            9   24     8     counter  I
    Exceptions:
      throws org.bouncycastle.crypto.DataLengthException, java.lang.IllegalArgumentException
    MethodParameters:
        Name  Flags
      out     
      outOff  
      len     
}
SourceFile: "BrokenKDF2BytesGenerator.java"