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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

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package org.spongycastle.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);
}