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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.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.security.KeyFactory;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.NoSuchProviderException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.cert.CertificateFactory;
import java.security.cert.X509Certificate;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAPublicKeySpec;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.cms.CMSAttributes;
import org.bouncycastle.asn1.cms.CMSObjectIdentifiers;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cert.jcajce.JcaX509CertificateConverter;
import org.bouncycastle.cms.CMSEnvelopedData;
import org.bouncycastle.cms.CMSEnvelopedDataGenerator;
import org.bouncycastle.cms.CMSEnvelopedDataParser;
import org.bouncycastle.cms.CMSException;
import org.bouncycastle.cms.CMSProcessableByteArray;
import org.bouncycastle.cms.CMSSignedData;
import org.bouncycastle.cms.CMSSignedDataParser;
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.JcaSignerInfoVerifierBuilder;
import org.bouncycastle.cms.jcajce.JcaX509CertSelectorConverter;
import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.DigestCalculatorProvider;
import org.bouncycastle.operator.OperatorCreationException;
import org.bouncycastle.operator.jcajce.JcaDigestCalculatorProviderBuilder;
import org.bouncycastle.util.Store;
import org.bouncycastle.util.encoders.Hex;
import org.bouncycastle.util.io.Streams;

public class Rfc4134Test
    extends TestCase
{
    private static final String BC = BouncyCastleProvider.PROVIDER_NAME;
    private static final String TEST_DATA_HOME = "bc.test.data.home";

    private static byte[] exContent = getRfc4134Data("ExContent.bin");
    private static byte[] sha1 = Hex.decode("406aec085279ba6e16022d9e0629c0229687dd48");

    private static final JcaX509CertSelectorConverter selectorConverter = new JcaX509CertSelectorConverter();
    private static final DigestCalculatorProvider digCalcProv;

    static
    {
        try
        {
            digCalcProv = new JcaDigestCalculatorProviderBuilder().build();
        }
        catch (OperatorCreationException e)
        {
            throw new IllegalStateException("can't create default provider!!!");
        }
    }

    public Rfc4134Test(String name)
    {
        super(name);
    }

    public static void main(String args[])
    {
        Security.addProvider(new BouncyCastleProvider());

        junit.textui.TestRunner.run(Rfc4134Test.class);
    }

    public static Test suite()
        throws Exception
    {
        return new CMSTestSetup(new TestSuite(Rfc4134Test.class));
    }

    public void test4_1()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.1.bin");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);
    }

    public void test4_2()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.2.bin");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);
    }

    public void testRfc4_3()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.3.bin");
        CMSSignedData signedData = new CMSSignedData(new CMSProcessableByteArray(exContent), data);

        verifySignatures(signedData, sha1);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv,
            new CMSTypedStream(new ByteArrayInputStream(exContent)),
            data);

        verifySignatures(parser);
    }

    public void test4_4()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.4.bin");
        byte[] counterSigCert = getRfc4134Data("AliceRSASignByCarl.cer");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData, sha1);

        verifySignerInfo4_4(getFirstSignerInfo(signedData.getSignerInfos()), counterSigCert);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);

        verifySignerInfo4_4(getFirstSignerInfo(parser.getSignerInfos()), counterSigCert);
    }

    public void test4_5()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.5.bin");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);
    }

    public void test4_6()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.6.bin");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);
    }

    public void test4_7()
        throws Exception
    {
        byte[] data = getRfc4134Data("4.7.bin");
        CMSSignedData signedData = new CMSSignedData(data);

        verifySignatures(signedData);

        CMSSignedDataParser parser = new CMSSignedDataParser(digCalcProv, data);

        verifySignatures(parser);
    }

    public void test5_1()
        throws Exception
    {
        byte[] data = getRfc4134Data("5.1.bin");
        CMSEnvelopedData envelopedData = new CMSEnvelopedData(data);

        verifyEnvelopedData(envelopedData, CMSEnvelopedDataGenerator.DES_EDE3_CBC);

        CMSEnvelopedDataParser envelopedParser = new CMSEnvelopedDataParser(data);

        verifyEnvelopedData(envelopedParser, CMSEnvelopedDataGenerator.DES_EDE3_CBC);
    }

    public void test5_2()
        throws Exception
    {
        byte[] data = getRfc4134Data("5.2.bin");
        CMSEnvelopedData envelopedData = new CMSEnvelopedData(data);

        verifyEnvelopedData(envelopedData, CMSEnvelopedDataGenerator.RC2_CBC);

        CMSEnvelopedDataParser envelopedParser = new CMSEnvelopedDataParser(data);

        verifyEnvelopedData(envelopedParser, CMSEnvelopedDataGenerator.RC2_CBC);
    }

    private void verifyEnvelopedData(CMSEnvelopedData envelopedData, String symAlgorithmOID)
        throws NoSuchAlgorithmException, NoSuchProviderException, InvalidKeySpecException, CMSException
    {
        byte[] privKeyData = getRfc4134Data("BobPrivRSAEncrypt.pri");
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privKeyData);
        KeyFactory keyFact = KeyFactory.getInstance("RSA", BC);
        PrivateKey privKey = keyFact.generatePrivate(keySpec);

        RecipientInformationStore recipients = envelopedData.getRecipientInfos();

        assertEquals(envelopedData.getEncryptionAlgOID(), symAlgorithmOID);

        Collection c = recipients.getRecipients();
        assertTrue(c.size() >= 1 && c.size() <= 2);

        Iterator it = c.iterator();
        verifyRecipient((RecipientInformation)it.next(), privKey);

        if (c.size() == 2)
        {
            RecipientInformation recInfo = (RecipientInformation)it.next();

            assertEquals(PKCSObjectIdentifiers.id_alg_CMSRC2wrap.getId(), recInfo.getKeyEncryptionAlgOID());
        }
    }

    private void verifyEnvelopedData(CMSEnvelopedDataParser envelopedParser, String symAlgorithmOID)
        throws NoSuchAlgorithmException, NoSuchProviderException, InvalidKeySpecException, CMSException
    {
        byte[] privKeyData = getRfc4134Data("BobPrivRSAEncrypt.pri");
        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privKeyData);
        KeyFactory keyFact = KeyFactory.getInstance("RSA", BC);
        PrivateKey privKey = keyFact.generatePrivate(keySpec);

        RecipientInformationStore recipients = envelopedParser.getRecipientInfos();

        assertEquals(envelopedParser.getEncryptionAlgOID(), symAlgorithmOID);

        Collection c = recipients.getRecipients();
        assertTrue(c.size() >= 1 && c.size() <= 2);

        Iterator it = c.iterator();
        verifyRecipient((RecipientInformation)it.next(), privKey);

        if (c.size() == 2)
        {
            RecipientInformation recInfo = (RecipientInformation)it.next();

            assertEquals(PKCSObjectIdentifiers.id_alg_CMSRC2wrap.getId(), recInfo.getKeyEncryptionAlgOID());
        }
    }

    private void verifyRecipient(RecipientInformation recipient, PrivateKey privKey)
        throws CMSException, NoSuchProviderException
    {
        assertEquals(recipient.getKeyEncryptionAlgOID(), PKCSObjectIdentifiers.rsaEncryption.getId());

        byte[] recData = recipient.getContent(new JceKeyTransEnvelopedRecipient(privKey).setProvider(BC));

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

    private void verifySignerInfo4_4(SignerInformation signerInfo, byte[] counterSigCert)
        throws Exception
    {
        verifyCounterSignature(signerInfo, counterSigCert);

        verifyContentHint(signerInfo);
    }

    private SignerInformation getFirstSignerInfo(SignerInformationStore store)
    {
        return (SignerInformation)store.getSigners().iterator().next();
    }

    private void verifyCounterSignature(SignerInformation signInfo, byte[] certificate)
        throws Exception
    {
        SignerInformation csi = (SignerInformation)signInfo.getCounterSignatures().getSigners().iterator().next();

        CertificateFactory certFact = CertificateFactory.getInstance("X.509", BC);
        X509Certificate cert = (X509Certificate)certFact.generateCertificate(new ByteArrayInputStream(certificate));

        assertTrue(csi.verify(new JcaSignerInfoVerifierBuilder(digCalcProv).setProvider(BC).build(cert)));
    }

    private void verifyContentHint(SignerInformation signInfo)
    {
        AttributeTable attrTable = signInfo.getUnsignedAttributes();

        Attribute attr = attrTable.get(CMSAttributes.contentHint);

        assertEquals(1, attr.getAttrValues().size());

        ASN1EncodableVector v = new ASN1EncodableVector();

        v.add(new DERUTF8String("Content Hints Description Buffer"));
        v.add(CMSObjectIdentifiers.data);

        assertTrue(attr.getAttrValues().getObjectAt(0).equals(new DERSequence(v)));
    }

    private void verifySignatures(CMSSignedData s, byte[] contentDigest)
        throws Exception
    {
        Store certStore = s.getCertificates();
        SignerInformationStore signers = s.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();

            verifySigner(signer, cert);

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

    private void verifySignatures(CMSSignedData s)
        throws Exception
    {
        verifySignatures(s, null);
    }

    private void verifySignatures(CMSSignedDataParser sp)
        throws Exception
    {
        CMSTypedStream sc = sp.getSignedContent();
        if (sc != null)
        {
            sc.drain();
        }

        Store certs = sp.getCertificates();
        SignerInformationStore signers = sp.getSignerInfos();

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

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

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

            verifySigner(signer, cert);
        }
    }

    private void verifySigner(SignerInformation signer, X509CertificateHolder certHolder)
        throws Exception
    {
        X509Certificate cert = new JcaX509CertificateConverter().setProvider("BC").getCertificate(certHolder);
        if (cert.getPublicKey() instanceof DSAPublicKey)
        {
            DSAPublicKey key = (DSAPublicKey)cert.getPublicKey();

            if (key.getParams() == null)
            {
                assertEquals(true, signer.verify(new JcaSignerInfoVerifierBuilder(digCalcProv).setProvider(BC).build(getInheritedKey(key))));
            }
            else
            {
                assertEquals(true, signer.verify(new JcaSignerInfoVerifierBuilder(digCalcProv).setProvider(BC).build(cert)));
            }
        }
        else
        {
            assertEquals(true, signer.verify(new JcaSignerInfoVerifierBuilder(digCalcProv).setProvider(BC).build(cert)));
        }
    }

    private PublicKey getInheritedKey(DSAPublicKey key)
        throws Exception
    {
        CertificateFactory certFact = CertificateFactory.getInstance("X.509", BC);

        X509Certificate cert = (X509Certificate)certFact.generateCertificate(new ByteArrayInputStream(getRfc4134Data("CarlDSSSelf.cer")));

        DSAParams dsaParams = ((DSAPublicKey)cert.getPublicKey()).getParams();

        DSAPublicKeySpec dsaPubKeySpec = new DSAPublicKeySpec(
            key.getY(), dsaParams.getP(), dsaParams.getQ(), dsaParams.getG());

        KeyFactory keyFactory = KeyFactory.getInstance("DSA", BC);

        return keyFactory.generatePublic(dsaPubKeySpec);
    }

    private static byte[] getRfc4134Data(String name)
    {
        String dataHome = System.getProperty(TEST_DATA_HOME);

        //
        // Try to find it
        //
        if (dataHome == null)
        {
            File tdCandidate = new File(new File("."), "core/src/test/data");
            if (tdCandidate.exists() && tdCandidate.isDirectory())
            {
                dataHome = tdCandidate.getAbsolutePath();
            }
        }


        if (dataHome == null)
        {
            throw new IllegalStateException(TEST_DATA_HOME + " property not set");
        }

        try
        {
            return Streams.readAll(new FileInputStream(dataHome + "/rfc4134/" + name));
        }
        catch (IOException e)
        {
            throw new RuntimeException(e.toString());
        }
    }
}




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