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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.hpke;

import org.bouncycastle.util.Arrays;

public class HPKEContextWithEncapsulation
    extends HPKEContext
{
    final byte[] encapsulation;

    public HPKEContextWithEncapsulation(HPKEContext context, byte[] encapsulation)
    {
        super(context.aead, context.hkdf, context.exporterSecret, context.suiteId);
        this.encapsulation = encapsulation;
    }

    public byte[] getEncapsulation()
    {
        return Arrays.clone(encapsulation);
    }
}