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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.pkcs.test;

import java.math.BigInteger;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Security;
import java.security.spec.RSAPrivateCrtKeySpec;
import java.security.spec.RSAPublicKeySpec;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.bouncycastle.asn1.pkcs.CertificationRequest;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.Extensions;
import org.bouncycastle.asn1.x509.GeneralName;
import org.bouncycastle.asn1.x509.GeneralNames;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.bouncycastle.operator.jcajce.JcaContentSignerBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.PKCS10CertificationRequestBuilder;
import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequest;
import org.bouncycastle.pkcs.jcajce.JcaPKCS10CertificationRequestBuilder;
import org.bouncycastle.util.encoders.Base64;
import org.bouncycastle.util.encoders.Hex;

public class PKCS10Test
    extends TestCase
{
    private static final byte[] anssiPkcs10 = Base64.decode(
        "MIHLMHMCAQAwDzENMAsGA1UEAwwEYmx1YjBbMBUGByqGSM49AgEGCiqBegGB"
            + "X2WCAAEDQgAEB9POXLIasfF55GSxY9vshIIEnvv47B9jGZgZFN6VFHPvqe8G"
            + "j+6UpLjP0vvoInC8uu/X3JJJTsrgGrxbfOOG1KAAMAoGCCqGSM49BAMCA0gA"
            + "MEUCIQCgTdLV3IS5NuL9CHMDPOj6BumAQPdjzbgkGZghoY/wJAIgcEgF/2f4"
            + "5wYlIELOq18Uxksc0sOkbZm/nRXs1VX4rsM=");

    //
    // personal keys
    //
    private static final RSAPublicKeySpec pubKeySpec = new RSAPublicKeySpec(
        new BigInteger("b4a7e46170574f16a97082b22be58b6a2a629798419be12872a4bdba626cfae9900f76abfb12139dce5de56564fab2b6543165a040c606887420e33d91ed7ed7", 16),
        new BigInteger("11", 16));

    private static final RSAPrivateCrtKeySpec privKeySpec = new RSAPrivateCrtKeySpec(
        new BigInteger("b4a7e46170574f16a97082b22be58b6a2a629798419be12872a4bdba626cfae9900f76abfb12139dce5de56564fab2b6543165a040c606887420e33d91ed7ed7", 16),
        new BigInteger("11", 16),
        new BigInteger("9f66f6b05410cd503b2709e88115d55daced94d1a34d4e32bf824d0dde6028ae79c5f07b580f5dce240d7111f7ddb130a7945cd7d957d1920994da389f490c89", 16),
        new BigInteger("c0a0758cdf14256f78d4708c86becdead1b50ad4ad6c5c703e2168fbf37884cb", 16),
        new BigInteger("f01734d7960ea60070f1b06f2bb81bfac48ff192ae18451d5e56c734a5aab8a5", 16),
        new BigInteger("b54bb9edff22051d9ee60f9351a48591b6500a319429c069a3e335a1d6171391", 16),
        new BigInteger("d3d83daf2a0cecd3367ae6f8ae1aeb82e9ac2f816c6fc483533d8297dd7884cd", 16),
        new BigInteger("b8f52fc6f38593dabb661d3f50f8897f8106eee68b1bce78a95b132b4e5b5d19", 16));

    public void setUp()
    {
        Security.addProvider(new BouncyCastleProvider());
    }

    public void testLeaveOffEmpty()
        throws Exception
    {
        KeyFactory keyFact = KeyFactory.getInstance("RSA", "BC");
        PublicKey pubKey = keyFact.generatePublic(pubKeySpec);
        PrivateKey privKey = keyFact.generatePrivate(privKeySpec);

        PKCS10CertificationRequestBuilder pkcs10Builder = new JcaPKCS10CertificationRequestBuilder(new X500Name("CN=Test"), pubKey);

        PKCS10CertificationRequest request = pkcs10Builder.build(new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privKey));

        assertEquals(0, request.getAttributes().length);
        assertNotNull(CertificationRequest.getInstance(request.getEncoded()).getCertificationRequestInfo().getAttributes());

        pkcs10Builder.setLeaveOffEmptyAttributes(true);

        request = pkcs10Builder.build(new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privKey));

        assertEquals(0, request.getAttributes().length);
        assertNull(CertificationRequest.getInstance(request.getEncoded()).getCertificationRequestInfo().getAttributes());

        pkcs10Builder.setLeaveOffEmptyAttributes(false);

        request = pkcs10Builder.build(new JcaContentSignerBuilder("SHA1withRSA").setProvider("BC").build(privKey));

        assertEquals(0, request.getAttributes().length);
        assertNotNull(CertificationRequest.getInstance(request.getEncoded()).getCertificationRequestInfo().getAttributes());
    }

    public void testRequest()
        throws Exception
    {
        JcaPKCS10CertificationRequest req = new JcaPKCS10CertificationRequest(anssiPkcs10);

        assertTrue(req.getPublicKey().toString().startsWith("EC Public Key [9a:f5:f3:36:55:81:27:66:dd:d8:76:5a:96:6b:26:7b:0c:61:a2:94]"));
    }


    public void testBrokenRequestWithDuplicateExtension()
        throws Exception
    {

        GeneralName name1 = new GeneralName(GeneralName.dNSName, "bc1.local");
        GeneralName name2 = new GeneralName(GeneralName.dNSName, "bc2.local");


        PKCS10CertificationRequest req = new PKCS10CertificationRequest(Hex.decode(
            "30820312308201fa02010030818f310b300906035504061302415531" +
                "283026060355040a0c1f546865204c6567696f6e206f662074686520426f756e637920436173746c653112301006035504070c094d" +
                "656c626f75726e653111300f06035504080c08566963746f726961312f302d06092a864886f70d0109011620666565646261636b2d" +
                "63727970746f40626f756e6379636173746c652e6f726730820122300d06092a864886f70d01010105000382010f003082010a0282" +
                "010100b08c92" +
                "7375b27e0f4f5642b8a96cca146f8ac8174b06f3d426943d49b2a2b4c5ab440a9f5c8596962d922d968b485394bfbe772422f8c32" +
                "7799224ca9f6dd6ded47c05a9ca2f619826958f1eb63c68d81732a310c88b821c8f207292e095423552ec74ab593a13422186b732" +
                "4106c0c35ca54cc46d4913f9a2d16282fcb9e32a3e4a5f764152d5c0fa1c2ca96b4ceee3f62683b2751b5f1abccd2d56f8960a887" +
                "1c7e186048fae235c863561f754bcb95ced6f89bcdc47ce6f5790600b23d14e27e5a89edcc6c25d78588fa87df199aaab01cc6594" +
                "6546b550351dab5e39002fc743851d46f65e9459b08e00e84b3e59b1c03cf8156cd9a1220671cedeeae66d0203010001a03d303b0" +
                "6092a864886f70d01090e312e302c30140603551d11040d300b82096263312e6c6f63616c30140603551d11040d300b8209626332" +
                "2e6c6f63616c300d06092a864886f70d01010b050003820101005f1a893308777f0cdacaeb7b62bebf7440769cddc7c696fe8f086" +
                "d59244aabe6d9591de69eac0ab9aca0c574ec04262cfbbdf9491444721904296f7db45dc68e27bf13803988949caad9faa903852b" +
                "a2ad9370c8127e25b92dc8849fa5b028fcdab529fecde2f0c2531d8bc6df3bd0896524b236ec60000db091561ec00b1a3c408d08a" +
                "1458caa0acb20efb9305892dd46fd062c5ac67caf8109e3947c7619e30ff271f9b2b968620c01960f55bd18c9abae088b318b853e" +
                "a00b7a0c47e569b843dbee57b57d42d01d0c2c63c035a4aea26ae2f7f824ee112b2a78c9bb859e2ae5d035dfab1210c4af4233895" +
                "53417705b4c32aaff3d12ffad2709ea50464b90"));


        //
        // Disassemble the attributes with the duplicate extensions.
        //
        Extensions extensions = req.getRequestedExtensions();
        GeneralNames subjectAltNames = GeneralNames.fromExtensions(extensions, Extension.subjectAlternativeName);

        //
        // Check expected order and value.
        //
        GeneralName[] names = subjectAltNames.getNames();
        if (!names[0].equals(name1))
        {
            fail("expected name 1");
        }

        if (!names[1].equals(name2))
        {
            fail("expected name 2");
        }
    }
    
    public static void main(String args[])
    {
        junit.textui.TestRunner.run(suite());
    }

    public static Test suite()
    {
        return new BCTestSetup(new TestSuite(PKCS10Test.class));
    }
}