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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 are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.

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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();
}