com.motorola.iden.provider
Class ARC4

java.lang.Object
  |
  +--com.motorola.iden.crypto.CipherSpi
        |
        +--com.motorola.iden.provider.ARC4

public final class ARC4

extends CipherSpi

ARC4, a stream cipher. The key size of ARC4 is less than 256 bits.

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© Copyright 2002 - 2004 Motorola, Inc. All Rights Reserved.

See Also:

[CipherSpi]

Constructor Summary

ARC4()

Method Summary

protected byte[]	engineDoFinal(byte[] input, int inputOffset, int inputLen) Finalizes ARC4 context
protected int	engineGetBlockSize() ARC4 is a stream cipher.
protected byte[]	engineGetIV() ARC4 does not use IV.
protected void	engineInit() Inits security builder by using the members of DES instance.
protected void	engineInit(int opmode, Key key, AlgorithmParameterSpec params, SecureRandom random) init ARC4 context.
protected void	engineSetMode(java.lang.String mode) engineSetMode is not implemented
protected void	engineSetPadding(java.lang.String padding) engineSetadding is not implemented
protected byte[]	engineUpdate(byte[] input, int inputOffset, int inputLen) update ARC4 context.
protected void	finalize()

Methods inherited from class java.lang.Object

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

Constructor Detail

ARC4

public ARC4()

Method Detail

engineSetMode

protected void engineSetMode(java.lang.String mode)
                      throws NoSuchAlgorithmException

engineSetMode is not implemented

Overrides:

engineSetMode in class CipherSpi

Following copied from class: com.motorola.iden.crypto.CipherSpi

Parameters:

mode - the cipher mode

Throws:

NoSuchAlgorithmException - if the requested cipher mode does not exist

engineSetPadding

protected void engineSetPadding(java.lang.String padding)
                         throws NoSuchPaddingException

engineSetadding is not implemented

Overrides:

engineSetPadding in class CipherSpi

Following copied from class: com.motorola.iden.crypto.CipherSpi

Parameters:

padding - the padding mechanism

Throws:

NoSuchPaddingException - if the requested padding mechanism does not exist

engineGetBlockSize

protected int engineGetBlockSize()

ARC4 is a stream cipher. The mothod returns zero.

Overrides:

engineGetBlockSize in class CipherSpi

Following copied from class: com.motorola.iden.crypto.CipherSpi

Returns:

the block size (in bytes), or 0 if the underlying algorithm is not a block cipher

engineGetIV

protected byte[] engineGetIV()

ARC4 does not use IV.

Overrides:

engineGetIV in class CipherSpi

Throws:

SecurityException:ARC4 - does not use IV

engineInit

protected void engineInit(int opmode,
                          Key key,
                          AlgorithmParameterSpec params,
                          SecureRandom random)
                   throws InvalidKeyException,
                          InvalidAlgorithmParameterException

init ARC4 context.

Overrides:

engineInit in class CipherSpi

Parameters:

opmode,key,ivparmeters - and random.

Returns:

void.

engineUpdate

protected byte[] engineUpdate(byte[] input,
                              int inputOffset,
                              int inputLen)

update ARC4 context.

Overrides:

engineUpdate in class CipherSpi

Parameters:

input, - inputoffset, inputLen

Returns:

encrypted or decrypted message.

engineDoFinal

protected byte[] engineDoFinal(byte[] input,
                               int inputOffset,
                               int inputLen)
                        throws IllegalBlockSizeException,
                               BadPaddingException

Finalizes ARC4 context

Overrides:

engineDoFinal in class CipherSpi

Parameters:

input, - inputoffset, inputLen

Returns:

encrypted or decrypted message.

finalize

protected void finalize()

Overrides:

finalize in class java.lang.Object

engineInit

protected void engineInit()
                   throws InvalidKeyException,
                          InvalidAlgorithmParameterException

Inits security builder by using the members of DES instance.