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## org.bouncycastle.crypto.engines
Class CAST5Engine

    java.lang.Object
      org.bouncycastle.crypto.engines.CAST5Engine

All Implemented Interfaces:
  BlockCipher

Direct Known Subclasses:
  CAST6Engine

public class CAST5Engine
extends java.lang.Object
implements BlockCipher

A class that provides CAST key encryption operations, such as encoding data and generating keys. All the algorithms herein are from the Internet RFC's RFC2144 - CAST5 (64bit block, 40-128bit key) RFC2612 - CAST6 (128bit block, 128-256bit key) and implement a simplified cryptography interface.

Field Summary
`protected int[]` | `_Km`
`protected int[]` | `_Kr`
`protected static int` | `BLOCK_SIZE`
`protected static int` | `MAX_ROUNDS`
`protected static int` | `RED_ROUNDS`

Constructor Summary
`CAST5Engine()`

Method Summary
`protected void` | `Bits32ToBytes(int in, byte[] b, int offset)`
`protected void` | `Bits32ToInts(int in, int[] b, int offset)`
`protected int` | `BytesTo32bits(byte[] b, int i)`
`protected void` | `CAST_Decipher(int L16, int R16, int[] result)`
`protected void` | `CAST_Encipher(int L0, int R0, int[] result)` Does the 16 rounds to encrypt the block.
`protected int` | `decryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)` Decrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
`protected int` | `encryptBlock(byte[] src, int srcIndex, byte[] dst, int dstIndex)` Encrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.
`protected int` | `F1(int D, int Kmi, int Kri)` The first of the three processing functions for the encryption and decryption.
`protected int` | `F2(int D, int Kmi, int Kri)` The second of the three processing functions for the encryption and decryption.
`protected int` | `F3(int D, int Kmi, int Kri)` The third of the three processing functions for the encryption and decryption.
`java.lang.String` | `getAlgorithmName()` Return the name of the algorithm the cipher implements.
`int` | `getBlockSize()` Return the block size for this cipher (in bytes).
`void` | `init(boolean encrypting, CipherParameters params)` initialise a CAST cipher.
`protected int` | `IntsTo32bits(int[] b, int i)`
`int` | `processBlock(byte[] in, int inOff, byte[] out, int outOff)` Process one block of input from the array in and write it to the out array.
`void` | `reset()` Reset the cipher.
`protected void` | `setKey(byte[] key)`

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Field Detail

### MAX_ROUNDS

    protected static final int MAX_ROUNDS

See Also:
  Constant Field Values

### RED_ROUNDS

    protected static final int RED_ROUNDS

See Also:
  Constant Field Values

### BLOCK_SIZE

    protected static final int BLOCK_SIZE

See Also:
  Constant Field Values

### _Kr

    protected int[] _Kr

### _Km

    protected int[] _Km

Constructor Detail

### CAST5Engine

    public CAST5Engine()

Method Detail

### init

    public void init(boolean encrypting,
                     CipherParameters params)

  initialise a CAST cipher.

  Specified by:
    `init` in interface `BlockCipher`
  Parameters:
    `encrypting` - whether or not we are for encryption.
    `params` - the parameters required to set up the cipher.
  Throws:
    `java.lang.IllegalArgumentException` - if the params argument is inappropriate.

### getAlgorithmName

    public java.lang.String getAlgorithmName()

  Description copied from interface: `BlockCipher`
  Return the name of the algorithm the cipher implements.

  Specified by:
    `getAlgorithmName` in interface `BlockCipher`
  Returns:
    the name of the algorithm the cipher implements.

### processBlock

    public int processBlock(byte[] in,
                            int inOff,
                            byte[] out,
                            int outOff)

  Description copied from interface: `BlockCipher`
  Process one block of input from the array in and write it to the out array.

  Specified by:
    `processBlock` in interface `BlockCipher`
  Parameters:
    `in` - the array containing the input data.
    `inOff` - offset into the in array the data starts at.
    `out` - the array the output data will be copied into.
    `outOff` - the offset into the out array the output will start at.
  Returns:
    the number of bytes processed and produced.

### reset

    public void reset()

  Description copied from interface: `BlockCipher`
  Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).

  Specified by:
    `reset` in interface `BlockCipher`

### getBlockSize

    public int getBlockSize()

  Description copied from interface: `BlockCipher`
  Return the block size for this cipher (in bytes).

  Specified by:
    `getBlockSize` in interface `BlockCipher`
  Returns:
    the block size for this cipher in bytes.

### setKey

    protected void setKey(byte[] key)

### encryptBlock

    protected int encryptBlock(byte[] src,
                               int srcIndex,
                               byte[] dst,
                               int dstIndex)

  Encrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.

  Parameters:
    `src` - The plaintext buffer
    `srcIndex` - An offset into src
    `dst` - The ciphertext buffer
    `dstIndex` - An offset into dst

### decryptBlock

    protected int decryptBlock(byte[] src,
                               int srcIndex,
                               byte[] dst,
                               int dstIndex)

  Decrypt the given input starting at the given offset and place the result in the provided buffer starting at the given offset.

  Parameters:
    `src` - The plaintext buffer
    `srcIndex` - An offset into src
    `dst` - The ciphertext buffer
    `dstIndex` - An offset into dst

### F1

    protected final int F1(int D,
                           int Kmi,
                           int Kri)

  The first of the three processing functions for the encryption and decryption.

  Parameters:
    `D` - the input to be processed
    `Kmi` - the mask to be used from Km[n]
    `Kri` - the rotation value to be used

### F2

    protected final int F2(int D,
                           int Kmi,
                           int Kri)

  The second of the three processing functions for the encryption and decryption.

  Parameters:
    `D` - the input to be processed
    `Kmi` - the mask to be used from Km[n]
    `Kri` - the rotation value to be used

### F3

    protected final int F3(int D,
                           int Kmi,
                           int Kri)

  The third of the three processing functions for the encryption and decryption.

  Parameters:
    `D` - the input to be processed
    `Kmi` - the mask to be used from Km[n]
    `Kri` - the rotation value to be used

### CAST_Encipher

    protected final void CAST_Encipher(int L0,
                                       int R0,
                                       int[] result)

  Does the 16 rounds to encrypt the block.

  Parameters:
    `L0` - the LH-32bits of the plaintext block
    `R0` - the RH-32bits of the plaintext block

### CAST_Decipher

    protected final void CAST_Decipher(int L16,
                                       int R16,
                                       int[] result)

### Bits32ToInts

    protected final void Bits32ToInts(int in,
                                      int[] b,
                                      int offset)

### IntsTo32bits

    protected final int IntsTo32bits(int[] b,
                                     int i)

### Bits32ToBytes

    protected final void Bits32ToBytes(int in,
                                       byte[] b,
                                       int offset)

### BytesTo32bits

    protected final int BytesTo32bits(byte[] b,
                                      int i)

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