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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.cms;

import java.util.HashMap;
import java.util.Map;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.util.Arrays;

public class CMSAuthenticatedGenerator
    extends CMSEnvelopedGenerator
{
    protected CMSAttributeTableGenerator authGen;
    protected CMSAttributeTableGenerator unauthGen;

    /**
     * base constructor
     */
    public CMSAuthenticatedGenerator()
    {
    }

    public void setAuthenticatedAttributeGenerator(CMSAttributeTableGenerator authGen)
    {
        this.authGen = authGen;
    }

    public void setUnauthenticatedAttributeGenerator(CMSAttributeTableGenerator unauthGen)
    {
        this.unauthGen = unauthGen;
    }

    protected Map getBaseParameters(ASN1ObjectIdentifier contentType, AlgorithmIdentifier digAlgId, AlgorithmIdentifier macAlgId, byte[] hash)
    {
        Map param = new HashMap();
        param.put(CMSAttributeTableGenerator.CONTENT_TYPE, contentType);
        param.put(CMSAttributeTableGenerator.DIGEST_ALGORITHM_IDENTIFIER, digAlgId);
        param.put(CMSAttributeTableGenerator.DIGEST,  Arrays.clone(hash));
        param.put(CMSAttributeTableGenerator.MAC_ALGORITHM_IDENTIFIER,  macAlgId);
        return param;
    }
}