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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 1.4.

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package org.bouncycastle.crypto;

/**
 * The basic interface for key encapsulation mechanisms.
 */
public interface KeyEncapsulation
{
    /**
     * Initialise the key encapsulation mechanism.
     */
    public void init(CipherParameters param);

    /**
     * Encapsulate a randomly generated session key.    
     */
    public CipherParameters encrypt(byte[] out, int outOff, int keyLen);
    
    /**
     * Decapsulate an encapsulated session key.
     */
    public CipherParameters decrypt(byte[] in, int inOff, int inLen, int keyLen);
}