http://www.bouncycastle.org/java.html: 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.
  • The Legion of the Bouncy Castle Inc. 
package org.bouncycastle.crypto;


The basic interface for key encapsulation mechanisms.

/**
 * The basic interface for key encapsulation mechanisms.
 */
public interface KeyEncapsulation
{
    
Initialise the key encapsulation mechanism.

/**
     * Initialise the key encapsulation mechanism.
     */
    public void init(CipherParameters param);

    
Encapsulate a randomly generated session key.    

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

/**
     * Decapsulate an encapsulated session key.
     */
    public CipherParameters decrypt(byte[] in, int inOff, int inLen, int keyLen);
}