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This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).

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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);
}