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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 1.4. 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.cms.jcajce;

import java.io.OutputStream;
import java.util.zip.DeflaterOutputStream;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.operator.OutputCompressor;

public class ZlibCompressor
    implements OutputCompressor
{
    private static final String  ZLIB    = "1.2.840.113549.1.9.16.3.8";

    public AlgorithmIdentifier getAlgorithmIdentifier()
    {
        return new AlgorithmIdentifier(new ASN1ObjectIdentifier(ZLIB));
    }

    public OutputStream getOutputStream(OutputStream comOut)
    {
        return new DeflaterOutputStream(comOut);
    }
}