Top Description Fields Constructors Methods
org.bouncycastle.crypto.engines

public Class SkipjackEngine

extends Object
implements BlockCipher
Class Inheritance
All Implemented Interfaces
org.bouncycastle.crypto.BlockCipher
Imports
org.bouncycastle.crypto.BlockCipher, .CipherParameters, .CryptoServicePurpose, .CryptoServicesRegistrar, .DataLengthException, .OutputLengthException, org.bouncycastle.crypto.constraints.DefaultServiceProperties, org.bouncycastle.crypto.params.KeyParameter
a class that provides a basic SKIPJACK engine.

Field Summary

Modifier and TypeField and Description
pack-priv static final int
BLOCK_SIZE

private boolean
encrypting

pack-priv static short[]
ftable

private int[]
key0

private int[]
key1

private int[]
key2

private int[]
key3

Constructor Summary

AccessConstructor and Description
public
SkipjackEngine()

Method Summary

Modifier and TypeMethod and Description
public int
decryptBlock(byte[] in, int inOff, byte[] out, int outOff)

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

private int
g(int k, int w)

The G permutation

public String
getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.
public int
getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

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

private int
h(int k, int w)

the inverse of the G permutation.

public void
init(boolean
whether or not we are for encryption.
encrypting, CipherParameters
the parameters required to set up the cipher.
params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise a SKIPJACK cipher.
public int
processBlock(byte[]
the array containing the input data.
in, int
offset into the in array the data starts at.
inOff, byte[]
the array the output data will be copied into.
out, int
the offset into the out array the output will start at.
outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Process one block of input from the array in and write it to the out array.
public void
reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Reset the cipher.
Inherited from java.lang.Object:
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Field Detail

BLOCK_SIZEback to summary
pack-priv static final int BLOCK_SIZE
encryptingback to summary
private boolean encrypting
ftableback to summary
pack-priv static short[] ftable
key0back to summary
private int[] key0
key1back to summary
private int[] key1
key2back to summary
private int[] key2
key3back to summary
private int[] key3

Constructor Detail

SkipjackEngineback to summary
public SkipjackEngine()

Method Detail

decryptBlockback to summary
public int decryptBlock(byte[] in, int inOff, byte[] out, int outOff)
encryptBlockback to summary
public int encryptBlock(byte[] in, int inOff, byte[] out, int outOff)
gback to summary
private int g(int k, int w)

The G permutation

getAlgorithmNameback to summary
public String getAlgorithmName()

Implements org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Doc from org.bouncycastle.crypto.BlockCipher.getAlgorithmName.

Return the name of the algorithm the cipher implements.

Returns:String

the name of the algorithm the cipher implements.

getBlockSizeback to summary
public int getBlockSize()

Implements org.bouncycastle.crypto.BlockCipher.getBlockSize.

Doc from org.bouncycastle.crypto.BlockCipher.getBlockSize.

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

Returns:int

the block size for this cipher in bytes.

getPurposeback to summary
private CryptoServicePurpose getPurpose()
hback to summary
private int h(int k, int w)

the inverse of the G permutation.

initback to summary
public void init(boolean encrypting, CipherParameters params)

Implements org.bouncycastle.crypto.BlockCipher.init.

initialise a SKIPJACK cipher.

Parameters
encrypting:boolean

whether or not we are for encryption.

params:CipherParameters

the parameters required to set up the cipher.

Exceptions
IllegalArgumentException:
if the params argument is inappropriate.
processBlockback to summary
public int processBlock(byte[] in, int inOff, byte[] out, int outOff)

Implements org.bouncycastle.crypto.BlockCipher.processBlock.

Doc from org.bouncycastle.crypto.BlockCipher.processBlock.

Process one block of input from the array in and write it to the out array.

Parameters
in:byte[]

the array containing the input data.

inOff:int

offset into the in array the data starts at.

out:byte[]

the array the output data will be copied into.

outOff:int

the offset into the out array the output will start at.

Returns:int

the number of bytes processed and produced.

resetback to summary
public void reset()

Implements org.bouncycastle.crypto.BlockCipher.reset.

Doc from org.bouncycastle.crypto.BlockCipher.reset.

Reset the cipher. After resetting the cipher is in the same state as it was after the last init (if there was one).