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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 1.8 and up. The APIs are designed primarily to be used in conjunction with the BC LTS provider but may also be used with other providers providing cryptographic services.
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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.CMSSignatureAlgorithmNameGenerator;
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.SignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.jcajce.JcaContentVerifierProviderBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;

public class JcaSignerInfoVerifierBuilder
{
    private Helper helper = new Helper();
    private DigestCalculatorProvider digestProvider;
    private CMSSignatureAlgorithmNameGenerator sigAlgNameGen = new DefaultCMSSignatureAlgorithmNameGenerator();
    private SignatureAlgorithmIdentifierFinder sigAlgIDFinder = new DefaultSignatureAlgorithmIdentifierFinder();

    public JcaSignerInfoVerifierBuilder(DigestCalculatorProvider digestProvider)
    {
        this.digestProvider = digestProvider;
    }

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

        return this;
    }

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

        return this;
    }

    /**
     * Override the default signature algorithm name generator.
     *
     * @param sigAlgNameGen the algorithm name generator to use.
     * @return the current builder.
     */
    public JcaSignerInfoVerifierBuilder setSignatureAlgorithmNameGenerator(CMSSignatureAlgorithmNameGenerator sigAlgNameGen)
    {
        this.sigAlgNameGen = sigAlgNameGen;

        return this;
    }

    public JcaSignerInfoVerifierBuilder setSignatureAlgorithmFinder(SignatureAlgorithmIdentifierFinder sigAlgIDFinder)
    {
        this.sigAlgIDFinder = sigAlgIDFinder;

        return this;
    }

    public SignerInformationVerifier build(X509CertificateHolder certHolder)
        throws OperatorCreationException, CertificateException
    {
        return new SignerInformationVerifier(sigAlgNameGen, sigAlgIDFinder, helper.createContentVerifierProvider(certHolder), digestProvider);
    }

    public SignerInformationVerifier build(X509Certificate certificate)
        throws OperatorCreationException
    {
        return new SignerInformationVerifier(sigAlgNameGen, sigAlgIDFinder, helper.createContentVerifierProvider(certificate), digestProvider);
    }

    public SignerInformationVerifier build(PublicKey pubKey)
        throws OperatorCreationException
    {
        return new SignerInformationVerifier(sigAlgNameGen, sigAlgIDFinder, helper.createContentVerifierProvider(pubKey), digestProvider);
    }

    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);
        }
    }
}