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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.security.Provider;
import java.security.PublicKey;
import java.security.cert.CertificateException;
import java.security.cert.X509Certificate;

import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.DefaultCMSSignatureAlgorithmNameGenerator;
import org.bouncycastle.cms.SignerInformationVerifier;
import org.bouncycastle.operator.ContentVerifierProvider;
import org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentVerifierProviderBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;

public class JcaSimpleSignerInfoVerifierBuilder
{
    private Helper helper = new Helper();

    public JcaSimpleSignerInfoVerifierBuilder setProvider(Provider provider)
    {
        this.helper = new ProviderHelper(provider);

        return this;
    }

    public JcaSimpleSignerInfoVerifierBuilder setProvider(String providerName)
    {
        this.helper = new NamedHelper(providerName);

        return this;
    }

    public SignerInformationVerifier build(X509CertificateHolder certHolder)
        throws OperatorCreationException, CertificateException
    {
        return new SignerInformationVerifier(new DefaultCMSSignatureAlgorithmNameGenerator(), new DefaultSignatureAlgorithmIdentifierFinder(), helper.createContentVerifierProvider(certHolder), helper.createDigestCalculatorProvider());
    }

    public SignerInformationVerifier build(X509Certificate certificate)
        throws OperatorCreationException
    {
        return new SignerInformationVerifier(new DefaultCMSSignatureAlgorithmNameGenerator(), new DefaultSignatureAlgorithmIdentifierFinder(), helper.createContentVerifierProvider(certificate), helper.createDigestCalculatorProvider());
    }

    public SignerInformationVerifier build(PublicKey pubKey)
        throws OperatorCreationException
    {
        return new SignerInformationVerifier(new DefaultCMSSignatureAlgorithmNameGenerator(), new DefaultSignatureAlgorithmIdentifierFinder(), helper.createContentVerifierProvider(pubKey), helper.createDigestCalculatorProvider());
    }

    private static class Helper
    {
        ContentVerifierProvider createContentVerifierProvider(PublicKey publicKey)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().build(publicKey);
        }

        ContentVerifierProvider createContentVerifierProvider(X509Certificate certificate)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().build(certificate);
        }

        ContentVerifierProvider createContentVerifierProvider(X509CertificateHolder certHolder)
            throws OperatorCreationException, CertificateException
        {
            return new JcaContentVerifierProviderBuilder().build(certHolder);
        }

        DigestCalculatorProvider createDigestCalculatorProvider()
            throws OperatorCreationException
        {
            return new JcaDigestCalculatorProviderBuilder().build();
        }
    }

    private static class NamedHelper
        extends Helper
    {
        private final String providerName;

        public NamedHelper(String providerName)
        {
            this.providerName = providerName;
        }

        ContentVerifierProvider createContentVerifierProvider(PublicKey publicKey)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(providerName).build(publicKey);
        }

        ContentVerifierProvider createContentVerifierProvider(X509Certificate certificate)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(providerName).build(certificate);
        }

        DigestCalculatorProvider createDigestCalculatorProvider()
            throws OperatorCreationException
        {
            return new JcaDigestCalculatorProviderBuilder().setProvider(providerName).build();
        }

        ContentVerifierProvider createContentVerifierProvider(X509CertificateHolder certHolder)
            throws OperatorCreationException, CertificateException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(providerName).build(certHolder);
        }
    }

    private static class ProviderHelper
        extends Helper
    {
        private final Provider provider;

        public ProviderHelper(Provider provider)
        {
            this.provider = provider;
        }

        ContentVerifierProvider createContentVerifierProvider(PublicKey publicKey)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(provider).build(publicKey);
        }

        ContentVerifierProvider createContentVerifierProvider(X509Certificate certificate)
            throws OperatorCreationException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(provider).build(certificate);
        }

        DigestCalculatorProvider createDigestCalculatorProvider()
            throws OperatorCreationException
        {
            return new JcaDigestCalculatorProviderBuilder().setProvider(provider).build();
        }

        ContentVerifierProvider createContentVerifierProvider(X509CertificateHolder certHolder)
            throws OperatorCreationException, CertificateException
        {
            return new JcaContentVerifierProviderBuilder().setProvider(provider).build(certHolder);
        }
    }
}