CAST5Engine (Bouncy Castle Cryptography 1.55 API Specification)

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

Fields
Modifier and Type	Field and Description
`protected int[]`	`_Km`
`protected int[]`	`_Kr`
`protected static int`	`BLOCK_SIZE`
`protected static int`	`M32`
`protected static int`	`MAX_ROUNDS`
`protected static int`	`RED_ROUNDS`
`protected static int[]`	`S1`
`protected static int[]`	`S2`
`protected static int[]`	`S3`
`protected static int[]`	`S4`
`protected static int[]`	`S5`
`protected static int[]`	`S6`
`protected static int[]`	`S7`
`protected static int[]`	`S8`

Constructor Summary

Constructors
Constructor and Description

CAST5Engine()

Constructors
Constructor and Description
`CAST5Engine()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`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
  - M32
```
protected static final int M32
```
    See Also:
    
    Constant Field Values
  - S1
```
protected static final int[] S1
```
  - S2
```
protected static final int[] S2
```
  - S3
```
protected static final int[] S3
```
  - S4
```
protected static final int[] S4
```
  - S5
```
protected static final int[] S5
```
  - S6
```
protected static final int[] S6
```
  - S7
```
protected static final int[] S7
```
  - S8
```
protected static final int[] S8
```
  - 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)
```

Class CAST5Engine

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

M32

S1

S2

S3

S4

S5

S6

S7

S8

MAX_ROUNDS

RED_ROUNDS

BLOCK_SIZE

_Kr

_Km

Constructor Detail

CAST5Engine

Method Detail

init

getAlgorithmName

processBlock

reset

getBlockSize

setKey

encryptBlock

decryptBlock

F1

F2

F3

CAST_Encipher

CAST_Decipher

Bits32ToInts

IntsTo32bits

Bits32ToBytes

BytesTo32bits