org.bouncycastle.crypto.engines

Class CAST6Engine

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

protected static int
BLOCK_SIZE
protected static int
ROUNDS
protected int[]
_Km
protected int[]
_Kr
protected int[]
_Tm
protected int[]
_Tr

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

BLOCK_SIZE, M32, MAX_ROUNDS, RED_ROUNDS, S1, S2, S3, S4, S5, S6, S7, S8, _Km, _Kr

Constructor Summary

CAST6Engine()

Method Summary

protected void
CAST_Decipher(int A, int B, int C, int D, result[] )
Does the 12 quad rounds rounds to decrypt the block.
protected void
CAST_Encipher(int A, int B, int C, int D, 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, IntsTo32bits, decryptBlock, encryptBlock, getAlgorithmName, getBlockSize, init, processBlock, reset, setKey

Field Details

BLOCK_SIZE

protected static final int BLOCK_SIZE

Field Value:
16


ROUNDS

protected static final int ROUNDS

Field Value:
12


_Km

protected int[] _Km


_Kr

protected int[] _Kr


_Tm

protected int[] _Tm


_Tr

protected int[] _Tr

Constructor Details

CAST6Engine

public CAST6Engine()

Method Details

CAST_Decipher

protected final void CAST_Decipher(int A,
                                   int B,
                                   int C,
                                   int D,
                                   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


CAST_Encipher

protected final void CAST_Encipher(int A,
                                   int B,
                                   int C,
                                   int D,
                                   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


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 interface CAST5Engine

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


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 interface CAST5Engine

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


getAlgorithmName

public String getAlgorithmName()
Return the name of the algorithm the cipher implements.
Specified by:
getAlgorithmName in interface BlockCipher
Overrides:
getAlgorithmName in interface CAST5Engine

Returns:
the name of the algorithm the cipher implements.


getBlockSize

public int getBlockSize()
Return the block size for this cipher (in bytes).
Specified by:
getBlockSize in interface BlockCipher
Overrides:
getBlockSize in interface CAST5Engine

Returns:
the block size for this cipher in bytes.


reset

public void reset()
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 interface CAST5Engine


setKey

protected void setKey(byte[] key)
Overrides:
setKey in interface CAST5Engine