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The Bouncy Castle Java S/MIME APIs for handling S/MIME protocols. This jar contains S/MIME APIs for JDK 1.5 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. The JavaMail API and the Java activation framework will also be needed.

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package org.bouncycastle.operator;

import java.io.InputStream;

import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

/**
 * General interface for an operator that is able to produce
 * an InputStream that will produce uncompressed data.
 */
public interface InputExpander
{
    /**
     * Return the algorithm identifier describing the compression
     * algorithm and parameters this expander supports.
     *
     * @return algorithm oid and parameters.
     */
    AlgorithmIdentifier getAlgorithmIdentifier();

    /**
     * Wrap the passed in input stream comIn, returning an input stream
     * that expands anything read in from comIn.
     *
     * @param comIn the compressed input data stream..
     * @return an expanding InputStream.
     */
    InputStream getInputStream(InputStream comIn);
}