cryptix.provider.padding
Class OneAndZeroes

java.lang.Object
  xjava.security.IJCE_Traceable
      xjava.security.PaddingScheme
          cryptix.provider.padding.OneAndZeroes

All Implemented Interfaces:

Padding, Parameterized

public final class OneAndZeroes

extends PaddingScheme

Class for padding cipher data with a binary-digit one, followed by as many binary-digit zeroes as needed to fill this instance's blockSize.

Copyright © 1997 Systemics Ltd on behalf of the Cryptix Development Team.
All rights reserved.

$Revision: 1.4 $

Since:

Cryptix 2.2.2

Author:

Raif S. Naffah

See Also:

java.security.PaddingScheme

Field Summary

Fields inherited from class xjava.security.PaddingScheme

blockSize

Constructor Summary

OneAndZeroes()
Creates a OneAndZeroes object.

Method Summary

protected boolean	engineIsValidBlockSize(int size) SPI: Returns true if size is a valid block size (in bytes) for this algorithm.
protected int	enginePad(byte[] in, int offset, int length) Pads a given array of bytes.
protected int	engineUnpad(byte[] in, int offset, int length) Given the specified subarray of bytes that includes padding bytes, returns the index indicating where padding starts.

Methods inherited from class xjava.security.PaddingScheme

clone, engineGetParameter, engineSetBlockSize, engineSetParameter, getAlgorithm, getAlgorithms, getAlgorithms, getBlockSize, getInstance, getInstance, getParameter, pad, paddingScheme, padLength, setParameter, toString, unpad

Methods inherited from class java.lang.Object

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

Constructor Detail

OneAndZeroes

public OneAndZeroes()

Creates a OneAndZeroes object.

Method Detail

enginePad

protected int enginePad(byte[] in,
                        int offset,
                        int length)

Pads a given array of bytes. The padding is written to the same buffer that is used for input (in). When this method returns, the padded block will be stored at in[offset..offset+blockSize-1].

Specified by:

enginePad in class PaddingScheme

Parameters:

in - the buffer containing the incomplete block.

offset - the offset into the in buffer of the first byte in the group of bytes to be padded.

length - the number of bytes from the in buffer, starting at offset, that need to be padded.

Returns:

the number of padding bytes written.

engineUnpad

protected int engineUnpad(byte[] in,
                          int offset,
                          int length)

Given the specified subarray of bytes that includes padding bytes, returns the index indicating where padding starts.

Specified by:

engineUnpad in class PaddingScheme

Parameters:

in - the buffer containing the bytes.

offset - the offset into the in buffer of the first byte in the block.

length - the number of bytes from the in buffer to check, starting at offset.

Returns:

the index into the in buffer indicating where the padding starts.

engineIsValidBlockSize

protected boolean engineIsValidBlockSize(int size)

SPI: Returns true if size is a valid block size (in bytes) for this algorithm.

For OneAndZeroes padding, all sizes are valid.

Overrides:

engineIsValidBlockSize in class PaddingScheme