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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 to JDK 1.8. 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.PrivateKey;
import java.security.Provider;
import java.security.cert.CertificateEncodingException;
import java.security.cert.X509Certificate;

import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateHolder;
import org.bouncycastle.cms.CMSAttributeTableGenerator;
import org.bouncycastle.cms.DefaultSignedAttributeTableGenerator;
import org.bouncycastle.cms.SignerInfoGenerator;
import org.bouncycastle.cms.SignerInfoGeneratorBuilder;
import org.bouncycastle.operator.ContentSigner;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;

/**
 * Use this class if you are using a provider that has all the facilities you
 * need.
 * 
 * For example:
 * 
 *      CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
 *      ContentSigner sha1Signer = new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(signKP.getPrivate());
 *
 *      gen.addSignerInfoGenerator(
 *                new JcaSignerInfoGeneratorBuilder(
 *                     new JcaDigestCalculatorProviderBuilder().setProvider("BC").build())
 *                     .build(sha1Signer, signCert));
 * 
 * becomes:
 *  *      CMSSignedDataGenerator gen = new CMSSignedDataGenerator();
 *
 *      gen.addSignerInfoGenerator(
 *                new JcaSimpleSignerInfoGeneratorBuilder()
 *                     .setProvider("BC")
 *                     .build("SHA1withRSA", signKP.getPrivate(), signCert));
 * 
 */
public class JcaSimpleSignerInfoGeneratorBuilder
{
    private Helper helper;

    private boolean hasNoSignedAttributes;
    private CMSAttributeTableGenerator signedGen;
    private CMSAttributeTableGenerator unsignedGen;
    private AlgorithmIdentifier contentDigest;

    public JcaSimpleSignerInfoGeneratorBuilder()
        throws OperatorCreationException
    {
        this.helper = new Helper();
    }

    public JcaSimpleSignerInfoGeneratorBuilder setProvider(String providerName)
        throws OperatorCreationException
    {
        this.helper = new NamedHelper(providerName);

        return this;
    }

    public JcaSimpleSignerInfoGeneratorBuilder setProvider(Provider provider)
        throws OperatorCreationException
    {
        this.helper = new ProviderHelper(provider);

        return this;
    }

    /**
     * If the passed in flag is true, the signer signature will be based on the data, not
     * a collection of signed attributes, and no signed attributes will be included.
     *
     * @return the builder object
     */
    public JcaSimpleSignerInfoGeneratorBuilder setDirectSignature(boolean hasNoSignedAttributes)
    {
        this.hasNoSignedAttributes = hasNoSignedAttributes;

        return this;
    }

    public JcaSimpleSignerInfoGeneratorBuilder setContentDigest(AlgorithmIdentifier contentDigest)
    {
        this.contentDigest = contentDigest;

        return this;
    }

    public JcaSimpleSignerInfoGeneratorBuilder setSignedAttributeGenerator(CMSAttributeTableGenerator signedGen)
    {
        this.signedGen = signedGen;

        return this;
    }

    /**
     * set up a DefaultSignedAttributeTableGenerator primed with the passed in AttributeTable.
     *
     * @param attrTable table of attributes for priming generator
     * @return this.
     */
    public JcaSimpleSignerInfoGeneratorBuilder setSignedAttributeGenerator(AttributeTable attrTable)
    {
        this.signedGen = new DefaultSignedAttributeTableGenerator(attrTable);

        return this;
    }

    public JcaSimpleSignerInfoGeneratorBuilder setUnsignedAttributeGenerator(CMSAttributeTableGenerator unsignedGen)
    {
        this.unsignedGen = unsignedGen;

        return this;
    }

    public SignerInfoGenerator build(String algorithmName, PrivateKey privateKey, X509CertificateHolder certificate)
        throws OperatorCreationException
    {
        privateKey = CMSUtils.cleanPrivateKey(privateKey);
        ContentSigner contentSigner = helper.createContentSigner(algorithmName, privateKey);

        return configureAndBuild().build(contentSigner, certificate);
    }

    public SignerInfoGenerator build(String algorithmName, PrivateKey privateKey, X509Certificate certificate)
        throws OperatorCreationException, CertificateEncodingException
    {
        privateKey = CMSUtils.cleanPrivateKey(privateKey);
        ContentSigner contentSigner = helper.createContentSigner(algorithmName, privateKey);

        return configureAndBuild().build(contentSigner, new JcaX509CertificateHolder(certificate));
    }

    public SignerInfoGenerator build(String algorithmName, PrivateKey privateKey, byte[] keyIdentifier)
        throws OperatorCreationException
    {
        privateKey = CMSUtils.cleanPrivateKey(privateKey);
        ContentSigner contentSigner = helper.createContentSigner(algorithmName, privateKey);

        return configureAndBuild().build(contentSigner, keyIdentifier);
    }

    private SignerInfoGeneratorBuilder configureAndBuild()
        throws OperatorCreationException
    {
        SignerInfoGeneratorBuilder infoGeneratorBuilder = new SignerInfoGeneratorBuilder(helper.createDigestCalculatorProvider());

        infoGeneratorBuilder.setDirectSignature(hasNoSignedAttributes);
        infoGeneratorBuilder.setContentDigest(contentDigest);
        infoGeneratorBuilder.setSignedAttributeGenerator(signedGen);
        infoGeneratorBuilder.setUnsignedAttributeGenerator(unsignedGen);

        return infoGeneratorBuilder;
    }

    private static class Helper
    {
        ContentSigner createContentSigner(String algorithm, PrivateKey privateKey)
            throws OperatorCreationException
        {
            privateKey = CMSUtils.cleanPrivateKey(privateKey);
            return new JcaContentSignerBuilder(algorithm).build(privateKey);
        }

        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;
        }

        ContentSigner createContentSigner(String algorithm, PrivateKey privateKey)
            throws OperatorCreationException
        {
            privateKey = CMSUtils.cleanPrivateKey(privateKey);
            return new JcaContentSignerBuilder(algorithm).setProvider(providerName).build(privateKey);
        }

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

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

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

        ContentSigner createContentSigner(String algorithm, PrivateKey privateKey)
            throws OperatorCreationException
        {
            privateKey = CMSUtils.cleanPrivateKey(privateKey);
            return new JcaContentSignerBuilder(algorithm).setProvider(provider).build(privateKey);
        }

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