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.PKCS5S2ParametersGenerator extends org.bouncycastle.crypto.PBEParametersGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator
  super_class: org.bouncycastle.crypto.PBEParametersGenerator
{
  private org.bouncycastle.crypto.Mac hMac;
    descriptor: Lorg/bouncycastle/crypto/Mac;
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=1, args_size=1
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
         0: .line 27
            aload 0 /* this */
            invokespecial org.bouncycastle.crypto.PBEParametersGenerator.<init>:()V
         1: .line 22
            aload 0 /* this */
            new org.bouncycastle.crypto.macs.HMac
            dup
            new org.bouncycastle.crypto.digests.SHA1Digest
            dup
            invokespecial org.bouncycastle.crypto.digests.SHA1Digest.<init>:()V
            invokespecial org.bouncycastle.crypto.macs.HMac.<init>:(Lorg/bouncycastle/crypto/Digest;)V
            putfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
         2: .line 29
            return
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;

  private void F(byte[], byte[], int, byte[], byte[], int);
    descriptor: ([B[BI[B[BI)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=11, args_size=7
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // byte[] P
        start local 2 // byte[] S
        start local 3 // int c
        start local 4 // byte[] iBuf
        start local 5 // byte[] out
        start local 6 // int outOff
         0: .line 39
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            invokeinterface org.bouncycastle.crypto.Mac.getMacSize:()I
            newarray 8
            astore 7 /* state */
        start local 7 // byte[] state
         1: .line 40
            new org.bouncycastle.crypto.params.KeyParameter
            dup
            aload 1 /* P */
            invokespecial org.bouncycastle.crypto.params.KeyParameter.<init>:([B)V
            astore 8 /* param */
        start local 8 // org.bouncycastle.crypto.CipherParameters param
         2: .line 42
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 8 /* param */
            invokeinterface org.bouncycastle.crypto.Mac.init:(Lorg/bouncycastle/crypto/CipherParameters;)V
         3: .line 44
            aload 2 /* S */
            ifnull 5
         4: .line 46
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 2 /* S */
            iconst_0
            aload 2 /* S */
            arraylength
            invokeinterface org.bouncycastle.crypto.Mac.update:([BII)V
         5: .line 49
      StackMap locals: byte[] org.bouncycastle.crypto.CipherParameters
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 4 /* iBuf */
            iconst_0
            aload 4 /* iBuf */
            arraylength
            invokeinterface org.bouncycastle.crypto.Mac.update:([BII)V
         6: .line 51
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 7 /* state */
            iconst_0
            invokeinterface org.bouncycastle.crypto.Mac.doFinal:([BI)I
            pop
         7: .line 53
            aload 7 /* state */
            iconst_0
            aload 5 /* out */
            iload 6 /* outOff */
            aload 7 /* state */
            arraylength
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
         8: .line 55
            iload 3 /* c */
            ifne 10
         9: .line 57
            new java.lang.IllegalArgumentException
            dup
            ldc "iteration count must be at least 1."
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        10: .line 60
      StackMap locals:
      StackMap stack:
            iconst_1
            istore 9 /* count */
        start local 9 // int count
        11: goto 21
        12: .line 62
      StackMap locals: int
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 8 /* param */
            invokeinterface org.bouncycastle.crypto.Mac.init:(Lorg/bouncycastle/crypto/CipherParameters;)V
        13: .line 63
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 7 /* state */
            iconst_0
            aload 7 /* state */
            arraylength
            invokeinterface org.bouncycastle.crypto.Mac.update:([BII)V
        14: .line 64
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            aload 7 /* state */
            iconst_0
            invokeinterface org.bouncycastle.crypto.Mac.doFinal:([BI)I
            pop
        15: .line 66
            iconst_0
            istore 10 /* j */
        start local 10 // int j
        16: goto 19
        17: .line 68
      StackMap locals: int
      StackMap stack:
            aload 5 /* out */
            iload 6 /* outOff */
            iload 10 /* j */
            iadd
            dup2
            baload
            aload 7 /* state */
            iload 10 /* j */
            baload
            ixor
            i2b
            bastore
        18: .line 66
            iinc 10 /* j */ 1
      StackMap locals:
      StackMap stack:
        19: iload 10 /* j */
            aload 7 /* state */
            arraylength
            if_icmpne 17
        end local 10 // int j
        20: .line 60
            iinc 9 /* count */ 1
      StackMap locals:
      StackMap stack:
        21: iload 9 /* count */
            iload 3 /* c */
            if_icmplt 12
        end local 9 // int count
        22: .line 71
            return
        end local 8 // org.bouncycastle.crypto.CipherParameters param
        end local 7 // byte[] state
        end local 6 // int outOff
        end local 5 // byte[] out
        end local 4 // byte[] iBuf
        end local 3 // int c
        end local 2 // byte[] S
        end local 1 // byte[] P
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0   23     0    this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0   23     1       P  [B
            0   23     2       S  [B
            0   23     3       c  I
            0   23     4    iBuf  [B
            0   23     5     out  [B
            0   23     6  outOff  I
            1   23     7   state  [B
            2   23     8   param  Lorg/bouncycastle/crypto/CipherParameters;
           11   22     9   count  I
           16   20    10       j  I
    MethodParameters:
        Name  Flags
      P       
      S       
      c       
      iBuf    
      out     
      outOff  

  private void intToOctet(byte[], int);
    descriptor: ([BI)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=3, args_size=3
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // byte[] buf
        start local 2 // int i
         0: .line 77
            aload 1 /* buf */
            iconst_0
            iload 2 /* i */
            bipush 24
            iushr
            i2b
            bastore
         1: .line 78
            aload 1 /* buf */
            iconst_1
            iload 2 /* i */
            bipush 16
            iushr
            i2b
            bastore
         2: .line 79
            aload 1 /* buf */
            iconst_2
            iload 2 /* i */
            bipush 8
            iushr
            i2b
            bastore
         3: .line 80
            aload 1 /* buf */
            iconst_3
            iload 2 /* i */
            i2b
            bastore
         4: .line 81
            return
        end local 2 // int i
        end local 1 // byte[] buf
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0    5     1   buf  [B
            0    5     2     i  I
    MethodParameters:
      Name  Flags
      buf   
      i     

  private byte[] generateDerivedKey(int);
    descriptor: (I)[B
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=8, locals=7, args_size=2
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // int dkLen
         0: .line 86
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.hMac:Lorg/bouncycastle/crypto/Mac;
            invokeinterface org.bouncycastle.crypto.Mac.getMacSize:()I
            istore 2 /* hLen */
        start local 2 // int hLen
         1: .line 87
            iload 1 /* dkLen */
            iload 2 /* hLen */
            iadd
            iconst_1
            isub
            iload 2 /* hLen */
            idiv
            istore 3 /* l */
        start local 3 // int l
         2: .line 88
            iconst_4
            newarray 8
            astore 4 /* iBuf */
        start local 4 // byte[] iBuf
         3: .line 89
            iload 3 /* l */
            iload 2 /* hLen */
            imul
            newarray 8
            astore 5 /* out */
        start local 5 // byte[] out
         4: .line 91
            iconst_1
            istore 6 /* i */
        start local 6 // int i
         5: goto 9
         6: .line 93
      StackMap locals: org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator int int int byte[] byte[] int
      StackMap stack:
            aload 0 /* this */
            aload 4 /* iBuf */
            iload 6 /* i */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.intToOctet:([BI)V
         7: .line 95
            aload 0 /* this */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.password:[B
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.salt:[B
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.iterationCount:I
            aload 4 /* iBuf */
            aload 5 /* out */
            iload 6 /* i */
            iconst_1
            isub
            iload 2 /* hLen */
            imul
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.F:([B[BI[B[BI)V
         8: .line 91
            iinc 6 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 6 /* i */
            iload 3 /* l */
            if_icmple 6
        end local 6 // int i
        10: .line 98
            aload 5 /* out */
            areturn
        end local 5 // byte[] out
        end local 4 // byte[] iBuf
        end local 3 // int l
        end local 2 // int hLen
        end local 1 // int dkLen
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0   11     0   this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0   11     1  dkLen  I
            1   11     2   hLen  I
            2   11     3      l  I
            3   11     4   iBuf  [B
            4   11     5    out  [B
            5   10     6      i  I
    MethodParameters:
       Name  Flags
      dkLen  

  public org.bouncycastle.crypto.CipherParameters generateDerivedParameters(int);
    descriptor: (I)Lorg/bouncycastle/crypto/CipherParameters;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // int keySize
         0: .line 111
            iload 1 /* keySize */
            bipush 8
            idiv
            istore 1 /* keySize */
         1: .line 113
            aload 0 /* this */
            iload 1 /* keySize */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.generateDerivedKey:(I)[B
            astore 2 /* dKey */
        start local 2 // byte[] dKey
         2: .line 115
            new org.bouncycastle.crypto.params.KeyParameter
            dup
            aload 2 /* dKey */
            iconst_0
            iload 1 /* keySize */
            invokespecial org.bouncycastle.crypto.params.KeyParameter.<init>:([BII)V
            areturn
        end local 2 // byte[] dKey
        end local 1 // int keySize
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0    3     1  keySize  I
            2    3     2     dKey  [B
    MethodParameters:
         Name  Flags
      keySize  

  public org.bouncycastle.crypto.CipherParameters generateDerivedParameters(int, int);
    descriptor: (II)Lorg/bouncycastle/crypto/CipherParameters;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=4, args_size=3
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // int keySize
        start local 2 // int ivSize
         0: .line 131
            iload 1 /* keySize */
            bipush 8
            idiv
            istore 1 /* keySize */
         1: .line 132
            iload 2 /* ivSize */
            bipush 8
            idiv
            istore 2 /* ivSize */
         2: .line 134
            aload 0 /* this */
            iload 1 /* keySize */
            iload 2 /* ivSize */
            iadd
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.generateDerivedKey:(I)[B
            astore 3 /* dKey */
        start local 3 // byte[] dKey
         3: .line 136
            new org.bouncycastle.crypto.params.ParametersWithIV
            dup
            new org.bouncycastle.crypto.params.KeyParameter
            dup
            aload 3 /* dKey */
            iconst_0
            iload 1 /* keySize */
            invokespecial org.bouncycastle.crypto.params.KeyParameter.<init>:([BII)V
            aload 3 /* dKey */
            iload 1 /* keySize */
            iload 2 /* ivSize */
            invokespecial org.bouncycastle.crypto.params.ParametersWithIV.<init>:(Lorg/bouncycastle/crypto/CipherParameters;[BII)V
            areturn
        end local 3 // byte[] dKey
        end local 2 // int ivSize
        end local 1 // int keySize
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0    4     1  keySize  I
            0    4     2   ivSize  I
            3    4     3     dKey  [B
    MethodParameters:
         Name  Flags
      keySize  
      ivSize   

  public org.bouncycastle.crypto.CipherParameters generateDerivedMacParameters(int);
    descriptor: (I)Lorg/bouncycastle/crypto/CipherParameters;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
        start local 1 // int keySize
         0: .line 149
            aload 0 /* this */
            iload 1 /* keySize */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator.generateDerivedParameters:(I)Lorg/bouncycastle/crypto/CipherParameters;
            areturn
        end local 1 // int keySize
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S2ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S2ParametersGenerator;
            0    1     1  keySize  I
    MethodParameters:
         Name  Flags
      keySize  
}
SourceFile: "PKCS5S2ParametersGenerator.java"