Package org.bouncycastle.crypto.engines

Class CAST6Engine

java.lang.Object

org.bouncycastle.crypto.engines.CAST5Engine

org.bouncycastle.crypto.engines.CAST6Engine

All Implemented Interfaces:

BlockCipher

public final class CAST6Engine
extends CAST5Engine

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

Field Summary

Fields

Modifier and Type	Field	Description
protected int[]	_Km
protected int[]	_Kr
protected int[]	_Tm
protected int[]	_Tr
protected static final int	BLOCK_SIZE
protected static final int	ROUNDS

Fields inherited from class org.bouncycastle.crypto.engines.CAST5Engine

MAX_ROUNDS, RED_ROUNDS

Constructor Summary

Constructors

Constructor	Description
CAST6Engine()

Method Summary

Modifier and Type	Method	Description
protected final void	CAST_Decipher(int A, int B, int C, int D, int[] result)	Does the 12 quad rounds rounds to decrypt the block.
protected final void	CAST_Encipher(int A, int B, int C, int D, int[] result)	Does the 12 quad rounds 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.
String	getAlgorithmName()	Return the name of the algorithm the cipher implements.
int	getBlockSize()	Return the block size for this cipher (in bytes).
void	reset()	Reset the cipher.
protected void	setKey(byte[] key)

Methods inherited from class org.bouncycastle.crypto.engines.CAST5Engine

Bits32ToBytes, Bits32ToInts, BytesTo32bits, CAST_Decipher, CAST_Encipher, F1, F2, F3, init, IntsTo32bits, processBlock

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

ROUNDS

protected static final int 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

_Tr

protected int[] _Tr

_Tm

protected int[] _Tm

Constructor Details

CAST6Engine

public CAST6Engine()

Method Details

getAlgorithmName

public String getAlgorithmName()

Description copied from interface: BlockCipher

Return the name of the algorithm the cipher implements.

Specified by:

getAlgorithmName in interface BlockCipher

Overrides:

getAlgorithmName in class CAST5Engine

Returns:

the name of the algorithm the cipher implements.

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

Overrides:

reset in class CAST5Engine

getBlockSize

public int getBlockSize()

Description copied from interface: BlockCipher

Return the block size for this cipher (in bytes).

Specified by:

getBlockSize in interface BlockCipher

Overrides:

getBlockSize in class CAST5Engine

Returns:

the block size for this cipher in bytes.

setKey

protected void setKey(byte[] key)

Overrides:

setKey in class CAST5Engine

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.

Overrides:

encryptBlock in class CAST5Engine

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.

Overrides:

decryptBlock in class CAST5Engine

Parameters:

src - The plaintext buffer

srcIndex - An offset into src

dst - The ciphertext buffer

dstIndex - An offset into dst

CAST_Encipher

protected final void CAST_Encipher(int A,
 int B,
 int C,
 int D,
 int[] result)

Does the 12 quad rounds rounds to encrypt the block.

Parameters:

A - the 00-31 bits of the plaintext block

B - the 32-63 bits of the plaintext block

C - the 64-95 bits of the plaintext block

D - the 96-127 bits of the plaintext block

result - the resulting ciphertext

CAST_Decipher

protected final void CAST_Decipher(int A,
 int B,
 int C,
 int D,
 int[] result)

Does the 12 quad rounds rounds to decrypt the block.

Parameters:

A - the 00-31 bits of the ciphertext block

B - the 32-63 bits of the ciphertext block

C - the 64-95 bits of the ciphertext block

D - the 96-127 bits of the ciphertext block

result - the resulting plaintext