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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. This jar contains APIs for JDK 1.8 and up. The APIs can be used in conjunction with a JCE/JCA provider such as the one provided with the Bouncy Castle Cryptography APIs.

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package org.bouncycastle.operator;

import java.io.OutputStream;

/**
 * Base interface for extra methods required for handling associated data in AEAD ciphers.
 */
public interface AADProcessor
{
    /**
     * Return a stream to write associated data to in order to have it incorporated into the
     * AEAD cipher's MAC.
     *
     * @return a stream for collecting associated data.
     */
    OutputStream getAADStream();

    /**
     * Return the final value of AEAD cipher's MAC.
     *
     * @return MAC value for the AEAD cipher.
     */
    byte[] getMAC();
}