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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 and up.

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package org.bouncycastle.util;

/**
 * Interface for Memoable objects. Memoable objects allow the taking of a snapshot of their internal state
 * via the copy() method and then reseting the object back to that state later using the reset() method.
 */
public interface Memoable
{
    /**
     * Produce a copy of this object with its configuration and in its current state.
     * 
     * The returned object may be used simply to store the state, or may be used as a similar object
     * starting from the copied state.
     */
    Memoable copy();

    /**
     * Restore a copied object state into this object.
     * 
     * Implementations of this method should try to avoid or minimise memory allocation to perform the reset.
     *
     * @param other an object originally {@link #copy() copied} from an object of the same type as this instance.
     * @throws ClassCastException if the provided object is not of the correct type.
     * @throws MemoableResetException if the other parameter is in some other way invalid.
     */
    void reset(Memoable other);
}