org.bouncycastle.crypto.paddings
Class ISO7816d4Padding

java.lang.Object
  org.bouncycastle.crypto.paddings.ISO7816d4Padding

All Implemented Interfaces:

BlockCipherPadding

public class ISO7816d4Padding
extends java.lang.Object
implements BlockCipherPadding

A padder that adds the padding according to the scheme referenced in ISO 7814-4 - scheme 2 from ISO 9797-1. The first byte is 0x80, rest is 0x00

Constructor Summary

ISO7816d4Padding()

Method Summary

int	addPadding(byte[] in, int inOff) add the pad bytes to the passed in block, returning the number of bytes added.
java.lang.String	getPaddingName() Return the name of the algorithm the padder implements.
void	init(java.security.SecureRandom random) Initialise the padder.
int	padCount(byte[] in) return the number of pad bytes present in the block.

Methods inherited from class java.lang.Object

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

Constructor Detail

ISO7816d4Padding

public ISO7816d4Padding()

Method Detail

init

public void init(java.security.SecureRandom random)
          throws java.lang.IllegalArgumentException

Initialise the padder.

Specified by:

init in interface BlockCipherPadding

Parameters:

random - - a SecureRandom if available.

Throws:

java.lang.IllegalArgumentException

getPaddingName

public java.lang.String getPaddingName()

Return the name of the algorithm the padder implements.

Specified by:

getPaddingName in interface BlockCipherPadding

Returns:

the name of the algorithm the padder implements.

addPadding

public int addPadding(byte[] in,
                      int inOff)

add the pad bytes to the passed in block, returning the number of bytes added.

Specified by:

addPadding in interface BlockCipherPadding

padCount

public int padCount(byte[] in)
             throws InvalidCipherTextException

return the number of pad bytes present in the block.

Specified by:

padCount in interface BlockCipherPadding

Throws:

InvalidCipherTextException - if the padding is badly formed or invalid.