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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.test;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.math.BigInteger;
import java.security.GeneralSecurityException;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.SecureRandom;
import java.security.cert.X509Certificate;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.List;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.cms.ContentInfo;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x509.X509Name;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSEnvelopedData;
import org.bouncycastle.cms.CMSEnvelopedDataGenerator;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataGenerator;
import org.bouncycastle.cms.CMSSignedDataParser;
import org.bouncycastle.cms.CMSSignedDataStreamGenerator;
import org.bouncycastle.cms.CMSTypedData;
import org.bouncycastle.cms.CMSTypedStream;
import org.bouncycastle.cms.RecipientInformation;
import org.bouncycastle.cms.RecipientInformationStore;
import org.bouncycastle.cms.SignerInformation;
import org.bouncycastle.cms.SignerInformationStore;
import org.bouncycastle.cms.jcajce.JcaSignerInfoGeneratorBuilder;
import org.bouncycastle.cms.jcajce.JcaSimpleSignerInfoVerifierBuilder;
import org.bouncycastle.cms.jcajce.JcaX509CertSelectorConverter;
import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.CollectionStore;
import org.bouncycastle.util.Store;
import org.bouncycastle.x509.X509V3CertificateGenerator;

public class NullProviderTest
    extends TestCase
{
    static KeyPair keyPair;
    static X509Certificate keyCert;
    private static final String TEST_MESSAGE = "Hello World!";

    private JcaX509CertSelectorConverter selectorConverter = new JcaX509CertSelectorConverter();

    static
    {
        try
        {
            keyPair = generateKeyPair();
            String origDN = "O=Bouncy Castle, C=AU";
            keyCert = makeCertificate(keyPair, origDN, keyPair, origDN);
        }
        catch (Exception e)
        {
            throw new RuntimeException(e);
        }
    }

    public void testSHA1WithRSAEncapsulated()
        throws Exception
    {
        List certList = new ArrayList();
        CMSTypedData msg = new CMSProcessableByteArray(TEST_MESSAGE.getBytes());

        certList.add(new X509CertificateHolder(keyCert.getEncoded()));

        DigestCalculatorProvider digCalcProv = new JcaDigestCalculatorProviderBuilder().build();

        CMSSignedDataGenerator gen = new CMSSignedDataGenerator();

        gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(digCalcProv).build(new JcaContentSignerBuilder("SHA1withRSA").build(keyPair.getPrivate()), keyCert));

        gen.addCertificates(new CollectionStore(certList));

        CMSSignedData s = gen.generate(msg, true);

        ByteArrayInputStream bIn = new ByteArrayInputStream(s.getEncoded());
        ASN1InputStream aIn = new ASN1InputStream(bIn);

        s = new CMSSignedData(ContentInfo.getInstance(aIn.readObject()));

        Store certsAndCrls = s.getCertificates();

        SignerInformationStore signers = s.getSignerInfos();
        Collection c = signers.getSigners();
        Iterator it = c.iterator();

        while (it.hasNext())
        {
            SignerInformation     signer = (SignerInformation)it.next();
            Collection            certCollection = certsAndCrls.getMatches(signer.getSID());
            Iterator              certIt = certCollection.iterator();
            X509CertificateHolder cert = (X509CertificateHolder)certIt.next();

            assertEquals(true, signer.verify(new JcaSimpleSignerInfoVerifierBuilder().build(cert)));
        }
    }

    public void testSHA1WithRSAStream()
        throws Exception
    {
        List                  certList = new ArrayList();
        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        certList.add(new X509CertificateHolder(keyCert.getEncoded()));

        DigestCalculatorProvider digCalcProv = new JcaDigestCalculatorProviderBuilder().build();

        CMSSignedDataStreamGenerator gen = new CMSSignedDataStreamGenerator();

        gen.addSignerInfoGenerator(new JcaSignerInfoGeneratorBuilder(digCalcProv).build(new JcaContentSignerBuilder("SHA1withRSA").build(keyPair.getPrivate()), keyCert));

        gen.addCertificates(new CollectionStore(certList));

        OutputStream sigOut = gen.open(bOut);

        sigOut.write(TEST_MESSAGE.getBytes());

        sigOut.close();

        CMSSignedDataParser sp = new CMSSignedDataParser(digCalcProv,
                new CMSTypedStream(new ByteArrayInputStream(TEST_MESSAGE.getBytes())), bOut.toByteArray());

        sp.getSignedContent().drain();

        //
        // compute expected content digest
        //
        MessageDigest md = MessageDigest.getInstance("SHA1");

        byte[]                  contentDigest = md.digest(TEST_MESSAGE.getBytes());
        Store                   certStore = sp.getCertificates();
        SignerInformationStore  signers = sp.getSignerInfos();

        Collection              c = signers.getSigners();
        Iterator                it = c.iterator();

        while (it.hasNext())
        {
            SignerInformation   signer = (SignerInformation)it.next();
            Collection          certCollection = certStore.getMatches(signer.getSID());

            Iterator        certIt = certCollection.iterator();
            X509CertificateHolder cert = (X509CertificateHolder)certIt.next();

            assertEquals(true, signer.verify(new JcaSimpleSignerInfoVerifierBuilder().build(cert)));

            if (contentDigest != null)
            {
                assertTrue(MessageDigest.isEqual(contentDigest, signer.getContentDigest()));
            }
        }
    }

    public void testKeyTransDES()
        throws Exception
    {
        testKeyTrans(CMSEnvelopedDataGenerator.DES_EDE3_CBC);
    }

    public void testKeyTransAES128()
        throws Exception
    {
        testKeyTrans(CMSEnvelopedDataGenerator.AES128_CBC);
    }

    public void testKeyTransAES192()
        throws Exception
    {
        testKeyTrans(CMSEnvelopedDataGenerator.AES192_CBC);
    }

    public void testKeyTransAES256()
        throws Exception
    {
        testKeyTrans(CMSEnvelopedDataGenerator.AES256_CBC);
    }

    private void testKeyTrans(String algorithm)
        throws Exception
    {
        byte[]          data     = "WallaWallaWashington".getBytes();

        CMSEnvelopedDataGenerator edGen = new CMSEnvelopedDataGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(keyCert));

        CMSEnvelopedData ed = edGen.generate(
            new CMSProcessableByteArray(data),
            new JceCMSContentEncryptorBuilder(new ASN1ObjectIdentifier(algorithm)).build());

        RecipientInformationStore recipients = ed.getRecipientInfos();

        assertEquals(ed.getEncryptionAlgOID(), algorithm);

        Collection  c = recipients.getRecipients();

        assertEquals(1, c.size());

        Iterator    it = c.iterator();

        while (it.hasNext())
        {
            RecipientInformation recipient = (RecipientInformation)it.next();

            assertEquals(recipient.getKeyEncryptionAlgOID(), PKCSObjectIdentifiers.rsaEncryption.getId());

            byte[] recData = recipient.getContent(new JceKeyTransEnvelopedRecipient(keyPair.getPrivate()));

            assertEquals(true, Arrays.equals(data, recData));
        }
    }

    private static KeyPair generateKeyPair()
        throws NoSuchProviderException, NoSuchAlgorithmException
    {
        KeyPairGenerator kpg  = KeyPairGenerator.getInstance("RSA", "SunRsaSign");

        kpg.initialize(512, new SecureRandom());

        return kpg.generateKeyPair();
    }

    private static X509Certificate makeCertificate(KeyPair subKP, String _subDN, KeyPair issKP, String _issDN)
        throws GeneralSecurityException, IOException
    {

        PublicKey subPub  = subKP.getPublic();
        PrivateKey issPriv = issKP.getPrivate();
        PublicKey  issPub  = issKP.getPublic();

        X509V3CertificateGenerator v3CertGen = new X509V3CertificateGenerator();

        v3CertGen.reset();
        v3CertGen.setSerialNumber(BigInteger.valueOf(1));
        v3CertGen.setIssuerDN(new X509Name(_issDN));
        v3CertGen.setNotBefore(new Date(System.currentTimeMillis()));
        v3CertGen.setNotAfter(new Date(System.currentTimeMillis() + (1000L * 60 * 60 * 24 * 100)));
        v3CertGen.setSubjectDN(new X509Name(_subDN));
        v3CertGen.setPublicKey(subPub);

        v3CertGen.setSignatureAlgorithm("SHA1WithRSA");

        X509Certificate _cert = v3CertGen.generate(issPriv, "SunRsaSign");

        _cert.checkValidity(new Date());
        _cert.verify(issPub);

        return _cert;
    }

    public static Test suite()
        throws Exception
    {
        return new TestSuite(NullProviderTest.class);
    }
}