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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.jcajce;


import java.security.AlgorithmParameters;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.Provider;
import java.security.SecureRandom;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cms.CMSException;

public class JceAlgorithmIdentifierConverter
{
    private EnvelopedDataHelper helper = new EnvelopedDataHelper(new DefaultJcaJceExtHelper());
    private SecureRandom random;

    public JceAlgorithmIdentifierConverter()
    {
    }

    public JceAlgorithmIdentifierConverter setProvider(Provider provider)
    {
        this.helper = new EnvelopedDataHelper(new ProviderJcaJceExtHelper(provider));

        return this;
    }

    public JceAlgorithmIdentifierConverter setProvider(String providerName)
    {
        this.helper = new EnvelopedDataHelper(new NamedJcaJceExtHelper(providerName));

        return this;
    }

    public AlgorithmParameters getAlgorithmParameters(AlgorithmIdentifier algorithmIdentifier)
        throws CMSException
    {
        ASN1Encodable parameters = algorithmIdentifier.getParameters();

        if (parameters == null)
        {
            return null;
        }

        try
        {
            AlgorithmParameters params = helper.createAlgorithmParameters(algorithmIdentifier.getAlgorithm());

            CMSUtils.loadParameters(params, algorithmIdentifier.getParameters());

            return params;
        }
        catch (NoSuchAlgorithmException e)
        {
            throw new CMSException("can't find parameters for algorithm", e);
        }
        catch (NoSuchProviderException e)
        {
            throw new CMSException("can't find provider for algorithm", e);
        }
    }
}