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The file system driver family for ZIP and related archive file types. Add the JAR artifact of this module to the run time class path to make its file system drivers available for service location in the client API modules.

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/*
 * Copyright (C) 2005-2013 Schlichtherle IT Services.
 * All rights reserved. Use is subject to license terms.
 */
package de.schlichtherle.truezip.crypto;

import org.bouncycastle.crypto.BlockCipher;

/**
 * Extends a {@code BlockCipher} in order to support random access to
 * the blocks in a plain or cipher text.
 *
 * @author Christian Schlichtherle
 */
public interface SeekableBlockCipher extends BlockCipher {

    /**
     * Sets the counter so that the block with the given index, starting
     * at 0, can be processed next.
     *
     * @param blockCounter The index of the block, starting at 0, which will be
     *        processed next when
     *        {@link #processBlock(byte[], int, byte[], int)} is called.
     */
    void setBlockCounter(long blockCounter);

    /**
     * Returns the index of the block, starting at 0, which will be processed
     * next when {@link #processBlock(byte[], int, byte[], int)} is called.
     */
    long getBlockCounter();
}