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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 1.5 to JDK 1.8. 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.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);
}