xjava.security

Interface Padding

public interface Padding

Deprecated:

Padding is the interface defined by JavaSoft's JCE to be implemented by classes that provide a general-purpose padding scheme. It is not used in IJCE, for several reasons:

This interface is included in IJCE only so that classes that use it will not fail with an unrecoverable linking error. The abstract class PaddingScheme should be used instead.

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

$Revision: 1.2 $

Since: IJCE 1.0.0

Author: David Hopwood

See Also: java.security.PaddingScheme

Method Summary
intpad(byte[] in, int off, int len)
Pads a given array of bytes.
StringpaddingScheme()
Returns the standard name of the padding scheme implemented.
intpadLength(int len)
Returns the absolute value of the increase in size that a padding operation would cause on input data of a given length.
intunpad(byte[] in, int off, int len)
Given the specified subarray of bytes that includes padding bytes, returns the index indicating where padding starts.

Method Detail

pad

public int pad(byte[] in, int off, int len)
Pads a given array of bytes. The padded bytes are written to the same buffer that is used for input ("in").

Parameters: in the buffer containing the bytes. off the offset into the in buffer of the first byte in the group of bytes to be padded. len the number of bytes from the in buffer, starting at off, that need to be padded.

Returns: the number of padding bytes written.

See Also: java.security.Cipher#blockSize

paddingScheme

public String paddingScheme()
Returns the standard name of the padding scheme implemented.

See International JCE Standard Algorithm Names for a list of PaddingScheme algorithm names.

Returns: the standard name of the padding scheme, such as "PKCS#5".

padLength

public int padLength(int len)
Returns the absolute value of the increase in size that a padding operation would cause on input data of a given length.

Parameters: len the length of the data which is to be padded.

Returns: the absolute value of the increase in size that a padding operation would cause on input data of the specified length.

unpad

public int unpad(byte[] in, int off, int len)
Given the specified subarray of bytes that includes padding bytes, returns the index indicating where padding starts.

Parameters: in the buffer containing the bytes. off the starting offset into the in buffer of the bytes to be checked to determine where padding starts. len the number of bytes from the in buffer to check, starting at offset off.

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