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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.

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package org.bouncycastle.crypto;

import javax.security.auth.Destroyable;

/**
 * Interface describing secret with encapsulation details.
 */
public interface SecretWithEncapsulation
    extends Destroyable
{
    /**
     * Return the secret associated with the encapsulation.
     *
     * @return the secret the encapsulation is for.
     */
    byte[] getSecret();

    /**
     * Return the data that carries the secret in its encapsulated form.
     *
     * @return the encapsulation of the secret.
     */
    byte[] getEncapsulation();
}