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The Bouncy Castle Java APIs for CMS, PKCS, EAC, TSP, CMP, CRMF, OCSP, and certificate generation. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified.

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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);
}