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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 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.

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package org.bouncycastle.jcajce.io;

import java.io.OutputStream;
import java.security.MessageDigest;
import java.security.Signature;

import javax.crypto.Mac;

/**
 * Utility class for creating OutputStreams from different JCA/JCE operators.
 */
public class OutputStreamFactory
{
    /**
     * Create an OutputStream that wraps a signature.
     *
     * @param signature the signature to be updated as the stream is written to.
     * @return an OutputStream.
     */
    public static OutputStream createStream(Signature signature)
    {
        return new SignatureUpdatingOutputStream(signature);
    }

    /**
     * Create an OutputStream that wraps a digest.
     *
     * @param digest the digest to be updated as the stream is written to.
     * @return an OutputStream.
     */
    public static OutputStream createStream(MessageDigest digest)
    {
        return new DigestUpdatingOutputStream(digest);
    }

    /**
     * Create an OutputStream that wraps a mac.
     *
     * @param mac the signature to be updated as the stream is written to.
     * @return an OutputStream.
     */
    public static OutputStream createStream(Mac mac)
    {
        return new MacUpdatingOutputStream(mac);
    }
}