package org.bouncycastle.cms.test;

import java.io.BufferedOutputStream;
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.Security;
import java.security.cert.X509Certificate;
import java.security.spec.PKCS8EncodedKeySpec;
import java.util.Arrays;
import java.util.Collection;
import java.util.Hashtable;
import java.util.Iterator;

import javax.crypto.SecretKey;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.DERSet;
import org.bouncycastle.asn1.DERUTF8String;
import org.bouncycastle.asn1.cms.Attribute;
import org.bouncycastle.asn1.cms.AttributeTable;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cert.X509CertificateHolder;
import org.bouncycastle.cms.CMSAlgorithm;
import org.bouncycastle.cms.CMSEnvelopedDataGenerator;
import org.bouncycastle.cms.CMSEnvelopedDataParser;
import org.bouncycastle.cms.CMSEnvelopedDataStreamGenerator;
import org.bouncycastle.cms.CMSTypedStream;
import org.bouncycastle.cms.KEKRecipientId;
import org.bouncycastle.cms.OriginatorInfoGenerator;
import org.bouncycastle.cms.OriginatorInformation;
import org.bouncycastle.cms.RecipientId;
import org.bouncycastle.cms.RecipientInformation;
import org.bouncycastle.cms.RecipientInformationStore;
import org.bouncycastle.cms.SimpleAttributeTableGenerator;
import org.bouncycastle.cms.jcajce.JceCMSContentEncryptorBuilder;
import org.bouncycastle.cms.jcajce.JceKEKEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKEKRecipientInfoGenerator;
import org.bouncycastle.cms.jcajce.JceKeyAgreeEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKeyAgreeRecipientId;
import org.bouncycastle.cms.jcajce.JceKeyAgreeRecipientInfoGenerator;
import org.bouncycastle.cms.jcajce.JceKeyTransEnvelopedRecipient;
import org.bouncycastle.cms.jcajce.JceKeyTransRecipientInfoGenerator;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.encoders.Hex;

public class NewEnvelopedDataStreamTest
    extends TestCase
{
    private static final String BC = BouncyCastleProvider.PROVIDER_NAME;

    private static final int BUFFER_SIZE = 4000;
    private static String          _signDN;
    private static KeyPair         _signKP;
    private static X509Certificate _signCert;

    private static String          _origDN;
    private static KeyPair         _origKP;
    private static X509Certificate _origCert;

    private static String          _reciDN;
    private static KeyPair         _reciKP;
    private static X509Certificate _reciCert;

    private static KeyPair         _origEcKP;
    private static KeyPair         _reciEcKP;
    private static X509Certificate _reciEcCert;

    private static boolean         _initialised = false;
    
    public NewEnvelopedDataStreamTest()
    {
    }

    private static void init()
        throws Exception
    {
        if (!_initialised)
        {
            _initialised = true;

            _signDN   = "O=Bouncy Castle, C=AU";
            _signKP   = CMSTestUtil.makeKeyPair();
            _signCert = CMSTestUtil.makeCertificate(_signKP, _signDN, _signKP, _signDN);

            _origDN   = "CN=Bob, OU=Sales, O=Bouncy Castle, C=AU";
            _origKP   = CMSTestUtil.makeKeyPair();
            _origCert = CMSTestUtil.makeCertificate(_origKP, _origDN, _signKP, _signDN);

            _reciDN   = "CN=Doug, OU=Sales, O=Bouncy Castle, C=AU";
            _reciKP   = CMSTestUtil.makeKeyPair();
            _reciCert = CMSTestUtil.makeCertificate(_reciKP, _reciDN, _signKP, _signDN);

            _origEcKP = CMSTestUtil.makeEcDsaKeyPair();
            _reciEcKP = CMSTestUtil.makeEcDsaKeyPair();
            _reciEcCert = CMSTestUtil.makeCertificate(_reciEcKP, _reciDN, _signKP, _signDN);
        }
    }

    public void setUp()
        throws Exception
    {
        init();
    }

    public void testWorkingData()
        throws Exception
    {
        byte[]  keyData = Base64.decode(
                  "MIICdgIBADANBgkqhkiG9w0BAQEFAASCAmAwggJcAgEAAoGBAKrAz/SQKrcQ" +
                  "nj9IxHIfKDbuXsMqUpI06s2gps6fp7RDNvtUDDMOciWGFhD45YSy8GO0mPx3" +
                  "Nkc7vKBqX4TLcqLUz7kXGOHGOwiPZoNF+9jBMPNROe/B0My0PkWg9tuq+nxN" +
                  "64oD47+JvDwrpNOS5wsYavXeAW8Anv9ZzHLU7KwZAgMBAAECgYA/fqdVt+5K" +
                  "WKGfwr1Z+oAHvSf7xtchiw/tGtosZ24DOCNP3fcTXUHQ9kVqVkNyzt9ZFCT3" +
                  "bJUAdBQ2SpfuV4DusVeQZVzcROKeA09nPkxBpTefWbSDQGhb+eZq9L8JDRSW" +
                  "HyYqs+MBoUpLw7GKtZiJkZyY6CsYkAnQ+uYVWq/TIQJBAP5zafO4HUV/w4KD" +
                  "VJi+ua+GYF1Sg1t/dYL1kXO9GP1p75YAmtm6LdnOCas7wj70/G1YlPGkOP0V" +
                  "GFzeG5KAmAUCQQCryvKU9nwWA+kypcQT9Yr1P4vGS0APYoBThnZq7jEPc5Cm" +
                  "ZI82yseSxSeea0+8KQbZ5mvh1p3qImDLEH/iNSQFAkAghS+tboKPN10NeSt+" +
                  "uiGRRWNbiggv0YJ7Uldcq3ZeLQPp7/naiekCRUsHD4Qr97OrZf7jQ1HlRqTu" +
                  "eZScjMLhAkBNUMZCQnhwFAyEzdPkQ7LpU1MdyEopYmRssuxijZao5JLqQAGw" +
                  "YCzXokGFa7hz72b09F4DQurJL/WuDlvvu4jdAkEAxwT9lylvfSfEQw4/qQgZ" +
                  "MFB26gqB6Gqs1pHIZCzdliKx5BO3VDeUGfXMI8yOkbXoWbYx5xPid/+N8R//" +
                  "+sxLBw==");

        byte[] envData = Base64.decode(
                  "MIAGCSqGSIb3DQEHA6CAMIACAQAxgcQwgcECAQAwKjAlMRYwFAYDVQQKEw1C" +
                  "b3VuY3kgQ2FzdGxlMQswCQYDVQQGEwJBVQIBHjANBgkqhkiG9w0BAQEFAASB" +
                  "gDmnaDZ0vDJNlaUSYyEXsgbaUH+itNTjCOgv77QTX2ImXj+kTctM19PQF2I1" +
                  "0/NL0fjakvCgBTHKmk13a7jqB6cX3bysenHNrglHsgNGgeXQ7ggAq5fV/JQQ" +
                  "T7rSxEtuwpbuHQnoVUZahOHVKy/a0uLr9iIh1A3y+yZTZaG505ZJMIAGCSqG" +
                  "SIb3DQEHATAdBglghkgBZQMEAQIEENmkYNbDXiZxJWtq82qIRZKggAQgkOGr" +
                  "1JcTsADStez1eY4+rO4DtyBIyUYQ3pilnbirfPkAAAAAAAAAAAAA");


        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(envData);

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.AES128_CBC);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

        PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyData);
        KeyFactory          keyFact = KeyFactory.getInstance("RSA", BC);
        PrivateKey          priKey = keyFact.generatePrivate(keySpec);
        byte[]              data = Hex.decode("57616c6c6157616c6c6157617368696e67746f6e");

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(priKey).setProvider(BC));

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

    private void verifyData(
        ByteArrayOutputStream encodedStream,
        String                expectedOid,
        byte[]                expectedData)
        throws Exception
    {
        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(encodedStream.toByteArray());
        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), expectedOid);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(_reciKP.getPrivate()).setProvider(BC));

            assertEquals(true, Arrays.equals(expectedData, CMSTestUtil.streamToByteArray(recData.getContentStream())));
        }
    }

    public void testUnprotectedAttributes()
        throws Exception
    {
        byte[]          data     = "WallaWallaWashington".getBytes();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        Hashtable attrs = new Hashtable();

        attrs.put(PKCSObjectIdentifiers.id_aa_contentHint, new Attribute(PKCSObjectIdentifiers.id_aa_contentHint, new DERSet(new DERUTF8String("Hint"))));
        attrs.put(PKCSObjectIdentifiers.id_aa_receiptRequest, new Attribute(PKCSObjectIdentifiers.id_aa_receiptRequest, new DERSet(new DERUTF8String("Request"))));

        AttributeTable attrTable = new AttributeTable(attrs);

        edGen.setUnprotectedAttributeGenerator(new SimpleAttributeTableGenerator(attrTable));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        out.write(data);

        out.close();

        CMSEnvelopedDataParser ed = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ed.getRecipientInfos();

        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(_reciKP.getPrivate()).setProvider(BC));

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

        attrTable = ed.getUnprotectedAttributes();

        assertEquals(attrs.size(), 2);

        assertEquals(new DERUTF8String("Hint"), attrTable.get(PKCSObjectIdentifiers.id_aa_contentHint).getAttrValues().getObjectAt(0));
        assertEquals(new DERUTF8String("Request"), attrTable.get(PKCSObjectIdentifiers.id_aa_receiptRequest).getAttrValues().getObjectAt(0));
    }

    public void testKeyTransAES128GCM()
        throws Exception
    {
        byte[] data = new byte[2000];

        for (int i = 0; i != 2000; i++)
        {
            data[i] = (byte)(i & 0xff);
        }

        //
        // unbuffered
        //
        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
            bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_GCM).setProvider(BC).build());

        for (int i = 0; i != 2000; i++)
        {
            out.write(data[i]);
        }

        out.close();

        verifyData(bOut, CMSAlgorithm.AES128_GCM.getId(), data);

        int unbufferedLength = bOut.toByteArray().length;

        //
        // Using buffered output - should be == to unbuffered
        //
        edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        bOut = new ByteArrayOutputStream();

        out = edGen.open(bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_GCM).setProvider(BC).build());

        BufferedOutputStream bfOut = new BufferedOutputStream(out, 300);

        for (int i = 0; i != 2000; i++)
        {
            bfOut.write(data[i]);
        }

        bfOut.close();

        verifyData(bOut, CMSAlgorithm.AES128_GCM.getId(), data);

        assertTrue(bOut.toByteArray().length == unbufferedLength);
    }

    public void testKeyTransAES128BufferedStream()
        throws Exception
    {
        byte[] data = new byte[2000];

        for (int i = 0; i != 2000; i++)
        {
            data[i] = (byte)(i & 0xff);
        }

        //
        // unbuffered
        //
        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        for (int i = 0; i != 2000; i++)
        {
            out.write(data[i]);
        }

        out.close();

        verifyData(bOut, CMSEnvelopedDataGenerator.AES128_CBC, data);

        int unbufferedLength = bOut.toByteArray().length;

        //
        // Using buffered output - should be == to unbuffered
        //
        edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        bOut = new ByteArrayOutputStream();

        out = edGen.open(bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        BufferedOutputStream bfOut = new BufferedOutputStream(out, 300);

        for (int i = 0; i != 2000; i++)
        {
            bfOut.write(data[i]);
        }

        bfOut.close();

        verifyData(bOut, CMSEnvelopedDataGenerator.AES128_CBC, data);

        assertTrue(bOut.toByteArray().length == unbufferedLength);
    }

    public void testKeyTransAES128Buffered()
        throws Exception
    {
        byte[] data = new byte[2000];

        for (int i = 0; i != 2000; i++)
        {
            data[i] = (byte)(i & 0xff);
        }

        //
        // unbuffered
        //
        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        for (int i = 0; i != 2000; i++)
        {
            out.write(data[i]);
        }

        out.close();

        verifyData(bOut, CMSEnvelopedDataGenerator.AES128_CBC, data);

        int unbufferedLength = bOut.toByteArray().length;

        //
        // buffered - less than default of 1000
        //
        edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.setBufferSize(300);

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        bOut = new ByteArrayOutputStream();

        out = edGen.open(bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        for (int i = 0; i != 2000; i++)
        {
            out.write(data[i]);
        }

        out.close();

        verifyData(bOut, CMSEnvelopedDataGenerator.AES128_CBC, data);

        assertTrue(bOut.toByteArray().length > unbufferedLength);
    }

    public void testKeyTransAES128Der()
        throws Exception
    {
        byte[] data = new byte[2000];

        for (int i = 0; i != 2000; i++)
        {
            data[i] = (byte)(i & 0xff);
        }

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        for (int i = 0; i != 2000; i++)
        {
            out.write(data[i]);
        }

        out.close();

        // convert to DER
        ASN1InputStream aIn = new ASN1InputStream(bOut.toByteArray());

        bOut.reset();

        aIn.readObject().encodeTo(bOut, ASN1Encoding.DER);

        verifyData(bOut, CMSEnvelopedDataGenerator.AES128_CBC, data);
    }

    public void testKeyTransAES128Throughput()
        throws Exception
    {
        byte[] data = new byte[40001];

        for (int i = 0; i != data.length; i++)
        {
            data[i] = (byte)(i & 0xff);
        }

        //
        // buffered
        //
        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.setBufferSize(BUFFER_SIZE);

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        for (int i = 0; i != data.length; i++)
        {
            out.write(data[i]);
        }

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());
        RecipientInformationStore  recipients = ep.getRecipientInfos();
        Collection                 c = recipients.getRecipients();
        Iterator                   it = c.iterator();

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(_reciKP.getPrivate()).setProvider(BC));

            InputStream           dataStream = recData.getContentStream();
            ByteArrayOutputStream dataOut = new ByteArrayOutputStream();
            int                   len;
            byte[]                buf = new byte[BUFFER_SIZE];
            int                   count = 0;

            while (count != 10 && (len = dataStream.read(buf)) > 0)
            {
                assertEquals(buf.length, len);

                dataOut.write(buf);
                count++;
            }

            len = dataStream.read(buf);
            dataOut.write(buf, 0, len);

            assertEquals(true, Arrays.equals(data, dataOut.toByteArray()));
        }
        else
        {
            fail("recipient not found.");
        }
    }

    public void testKeyTransAES128AndOriginatorInfo()
        throws Exception
    {
        byte[]          data     = "WallaWallaWashington".getBytes();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        X509CertificateHolder origCert = new X509CertificateHolder(_origCert.getEncoded());

        edGen.setOriginatorInfo(new OriginatorInfoGenerator(origCert).generate());

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        assertTrue(ep.getOriginatorInfo().getCertificates().getMatches(null).contains(origCert));

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.AES128_CBC);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(_reciKP.getPrivate()).setProvider(BC));

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

        ep.close();
    }

    public void testKeyTransAES128()
        throws Exception
    {
        byte[]          data     = "WallaWallaWashington".getBytes();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());

        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.AES128_CBC);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(_reciKP.getPrivate()).setProvider(BC));

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

        ep.close();
    }

    public void testKeyTransCAST5SunJCE()
        throws Exception
    {
        if (Security.getProvider("SunJCE") == null)
        {
            return;
        }

        String version = System.getProperty("java.version");
        if (version.startsWith("1.4") || version.startsWith("1.3"))
        {
            return;
        }

        byte[]          data     = "WallaWallaWashington".getBytes();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        edGen.addRecipientInfoGenerator(new JceKeyTransRecipientInfoGenerator(_reciCert).setProvider("SunJCE"));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut, new JceCMSContentEncryptorBuilder(CMSAlgorithm.CAST5_CBC).setProvider(BC).build());

        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.CAST5_CBC);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

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

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

            CMSTypedStream recData = recipient.getContentStream(new JceKeyTransEnvelopedRecipient(_reciKP.getPrivate()).setProvider("SunJCE").setContentProvider(BC));

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

        ep.close();
    }

    public void testAESKEK()
        throws Exception
    {
        byte[]    data = "WallaWallaWashington".getBytes();
        SecretKey kek  = CMSTestUtil.makeAES192Key();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        byte[]  kekId = new byte[] { 1, 2, 3, 4, 5 };

        edGen.addRecipientInfoGenerator(new JceKEKRecipientInfoGenerator(kekId, kek).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut,
                                new JceCMSContentEncryptorBuilder(CMSAlgorithm.DES_EDE3_CBC).setProvider(BC).build());
        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.DES_EDE3_CBC);

        Collection  c = recipients.getRecipients();
        Iterator    it = c.iterator();

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

            assertEquals(recipient.getKeyEncryptionAlgOID(), "2.16.840.1.101.3.4.1.25");

            CMSTypedStream recData = recipient.getContentStream(new JceKEKEnvelopedRecipient(kek).setProvider(BC));

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

        ep.close();
    }

    public void testTwoAESKEK()
        throws Exception
    {
        byte[]    data = "WallaWallaWashington".getBytes();
        SecretKey kek1  = CMSTestUtil.makeAES192Key();
        SecretKey kek2  = CMSTestUtil.makeAES192Key();

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        byte[]  kekId1 = new byte[] { 1, 2, 3, 4, 5 };
        byte[]  kekId2 = new byte[] { 5, 4, 3, 2, 1 };

        edGen.addRecipientInfoGenerator(new JceKEKRecipientInfoGenerator(kekId1, kek1).setProvider(BC));
        edGen.addRecipientInfoGenerator(new JceKEKRecipientInfoGenerator(kekId2, kek2).setProvider(BC));

        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut,
                                new JceCMSContentEncryptorBuilder(CMSAlgorithm.DES_EDE3_CBC).setProvider(BC).build());
        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.DES_EDE3_CBC);

        RecipientId                recSel = new KEKRecipientId(kekId2);

        RecipientInformation       recipient = recipients.get(recSel);

        assertEquals(recipient.getKeyEncryptionAlgOID(), "2.16.840.1.101.3.4.1.25");

        CMSTypedStream recData = recipient.getContentStream(new JceKEKEnvelopedRecipient(kek2).setProvider(BC));

        assertEquals(true, Arrays.equals(data, CMSTestUtil.streamToByteArray(recData.getContentStream())));

        ep.close();
    }

    public void testECKeyAgree()
        throws Exception
    {
        byte[] data = Hex.decode("504b492d4320434d5320456e76656c6f706564446174612053616d706c65");

        CMSEnvelopedDataStreamGenerator edGen = new CMSEnvelopedDataStreamGenerator();

        JceKeyAgreeRecipientInfoGenerator recipientGenerator = new JceKeyAgreeRecipientInfoGenerator(CMSAlgorithm.ECDH_SHA1KDF, _origEcKP.getPrivate(), _origEcKP.getPublic(), CMSAlgorithm.AES128_WRAP).setProvider(BC);

        recipientGenerator.addRecipient(_reciEcCert);

        edGen.addRecipientInfoGenerator(recipientGenerator);
        
        ByteArrayOutputStream  bOut = new ByteArrayOutputStream();

        OutputStream out = edGen.open(
                                bOut,
                                new JceCMSContentEncryptorBuilder(CMSAlgorithm.AES128_CBC).setProvider(BC).build());
        out.write(data);

        out.close();

        CMSEnvelopedDataParser     ep = new CMSEnvelopedDataParser(bOut.toByteArray());

        RecipientInformationStore  recipients = ep.getRecipientInfos();

        assertEquals(ep.getEncryptionAlgOID(), CMSEnvelopedDataGenerator.AES128_CBC);

        RecipientId                recSel = new JceKeyAgreeRecipientId(_reciEcCert);

        RecipientInformation       recipient = recipients.get(recSel);

        CMSTypedStream recData = recipient.getContentStream(new JceKeyAgreeEnvelopedRecipient(_reciEcKP.getPrivate()).setProvider(BC));

        assertEquals(true, Arrays.equals(data, CMSTestUtil.streamToByteArray(recData.getContentStream())));

        ep.close();
    }

    public void testOriginatorInfo()
        throws Exception
    {
        CMSEnvelopedDataParser env = new CMSEnvelopedDataParser(CMSSampleMessages.originatorMessage);

        OriginatorInformation origInfo = env.getOriginatorInfo();

        RecipientInformationStore  recipients = env.getRecipientInfos();

        assertEquals(new X500Name("C=US,O=U.S. Government,OU=HSPD12Lab,OU=Agents,CN=user1"), ((X509CertificateHolder)origInfo.getCertificates().getMatches(null).iterator().next()).getSubject());
        assertEquals(CMSEnvelopedDataGenerator.DES_EDE3_CBC, env.getEncryptionAlgOID());
    }

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