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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8. Note: this package includes the NTRU encryption algorithms.

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package org.bouncycastle.crypto.paddings;

import java.security.SecureRandom;

import org.bouncycastle.crypto.InvalidCipherTextException;

/**
 * Block cipher padders are expected to conform to this interface
 */
public interface BlockCipherPadding
{
    /**
     * Initialise the padder.
     *
     * @param random the source of randomness for the padding, if required.
     */
    public void init(SecureRandom random)
        throws IllegalArgumentException;

    /**
     * Return the name of the algorithm the cipher implements.
     *
     * @return the name of the algorithm the cipher implements.
     */
    public String getPaddingName();

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

* Note: this assumes that the last block of plain text is always * passed to it inside in. i.e. if inOff is zero, indicating the * entire block is to be overwritten with padding the value of in * should be the same as the last block of plain text. The reason * for this is that some modes such as "trailing bit compliment" * base the padding on the last byte of plain text. *

*/ public int addPadding(byte[] in, int inOff); /** * return the number of pad bytes present in the block. * @exception InvalidCipherTextException if the padding is badly formed * or invalid. */ public int padCount(byte[] in) throws InvalidCipherTextException; }




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