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Spongy Castle is a package-rename (org.bouncycastle.* to org.spongycastle.*) of Bouncy Castle intended for the Android platform. Android unfortunately ships with a stripped-down version of Bouncy Castle, which prevents easy upgrades - Spongy Castle overcomes this and provides a full, up-to-date version of the Bouncy Castle cryptographic libs.

There is a newer version: 1.54.0.0

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package org.spongycastle.cms.jcajce;

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

import org.spongycastle.asn1.ASN1ObjectIdentifier;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.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);
    }
}