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.PKCS5S1ParametersGenerator extends org.bouncycastle.crypto.PBEParametersGenerator
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator
  super_class: org.bouncycastle.crypto.PBEParametersGenerator
{
  private org.bouncycastle.crypto.Digest digest;
    descriptor: Lorg/bouncycastle/crypto/Digest;
    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.crypto.generators.PKCS5S1ParametersGenerator this
        start local 1 // org.bouncycastle.crypto.Digest digest
         0: .line 28
            aload 0 /* this */
            invokespecial org.bouncycastle.crypto.PBEParametersGenerator.<init>:()V
         1: .line 31
            aload 0 /* this */
            aload 1 /* digest */
            putfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
         2: .line 32
            return
        end local 1 // org.bouncycastle.crypto.Digest digest
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lorg/bouncycastle/crypto/generators/PKCS5S1ParametersGenerator;
            0    3     1  digest  Lorg/bouncycastle/crypto/Digest;
    MethodParameters:
        Name  Flags
      digest  

  private byte[] generateDerivedKey();
    descriptor: ()[B
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=4, locals=3, args_size=1
        start local 0 // org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator this
         0: .line 39
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            newarray 8
            astore 1 /* digestBytes */
        start local 1 // byte[] digestBytes
         1: .line 41
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.password:[B
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.password:[B
            arraylength
            invokeinterface org.bouncycastle.crypto.Digest.update:([BII)V
         2: .line 42
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.salt:[B
            iconst_0
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.salt:[B
            arraylength
            invokeinterface org.bouncycastle.crypto.Digest.update:([BII)V
         3: .line 44
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 1 /* digestBytes */
            iconst_0
            invokeinterface org.bouncycastle.crypto.Digest.doFinal:([BI)I
            pop
         4: .line 45
            iconst_1
            istore 2 /* i */
        start local 2 // int i
         5: goto 9
         6: .line 47
      StackMap locals: byte[] int
      StackMap stack:
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 1 /* digestBytes */
            iconst_0
            aload 1 /* digestBytes */
            arraylength
            invokeinterface org.bouncycastle.crypto.Digest.update:([BII)V
         7: .line 48
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            aload 1 /* digestBytes */
            iconst_0
            invokeinterface org.bouncycastle.crypto.Digest.doFinal:([BI)I
            pop
         8: .line 45
            iinc 2 /* i */ 1
      StackMap locals:
      StackMap stack:
         9: iload 2 /* i */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.iterationCount:I
            if_icmplt 6
        end local 2 // int i
        10: .line 51
            aload 1 /* digestBytes */
            areturn
        end local 1 // byte[] digestBytes
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0   11     0         this  Lorg/bouncycastle/crypto/generators/PKCS5S1ParametersGenerator;
            1   11     1  digestBytes  [B
            5   10     2            i  I

  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.PKCS5S1ParametersGenerator this
        start local 1 // int keySize
         0: .line 65
            iload 1 /* keySize */
            bipush 8
            idiv
            istore 1 /* keySize */
         1: .line 67
            iload 1 /* keySize */
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            if_icmple 5
         2: .line 69
            new java.lang.IllegalArgumentException
            dup
         3: .line 70
            new java.lang.StringBuilder
            dup
            ldc "Can't generate a derived key "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* keySize */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " bytes long."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         4: .line 69
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         5: .line 73
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.generateDerivedKey:()[B
            astore 2 /* dKey */
        start local 2 // byte[] dKey
         6: .line 75
            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.PKCS5S1ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S1ParametersGenerator;
            0    7     1  keySize  I
            6    7     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.PKCS5S1ParametersGenerator this
        start local 1 // int keySize
        start local 2 // int ivSize
         0: .line 92
            iload 1 /* keySize */
            bipush 8
            idiv
            istore 1 /* keySize */
         1: .line 93
            iload 2 /* ivSize */
            bipush 8
            idiv
            istore 2 /* ivSize */
         2: .line 95
            iload 1 /* keySize */
            iload 2 /* ivSize */
            iadd
            aload 0 /* this */
            getfield org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.digest:Lorg/bouncycastle/crypto/Digest;
            invokeinterface org.bouncycastle.crypto.Digest.getDigestSize:()I
            if_icmple 6
         3: .line 97
            new java.lang.IllegalArgumentException
            dup
         4: .line 98
            new java.lang.StringBuilder
            dup
            ldc "Can't generate a derived key "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 1 /* keySize */
            iload 2 /* ivSize */
            iadd
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            ldc " bytes long."
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         5: .line 97
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
         6: .line 101
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.generateDerivedKey:()[B
            astore 3 /* dKey */
        start local 3 // byte[] dKey
         7: .line 103
            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.PKCS5S1ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    8     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S1ParametersGenerator;
            0    8     1  keySize  I
            0    8     2   ivSize  I
            7    8     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.PKCS5S1ParametersGenerator this
        start local 1 // int keySize
         0: .line 117
            aload 0 /* this */
            iload 1 /* keySize */
            invokevirtual org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator.generateDerivedParameters:(I)Lorg/bouncycastle/crypto/CipherParameters;
            areturn
        end local 1 // int keySize
        end local 0 // org.bouncycastle.crypto.generators.PKCS5S1ParametersGenerator this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    1     0     this  Lorg/bouncycastle/crypto/generators/PKCS5S1ParametersGenerator;
            0    1     1  keySize  I
    MethodParameters:
         Name  Flags
      keySize  
}
SourceFile: "PKCS5S1ParametersGenerator.java"