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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.cert.test;

import java.math.BigInteger;
import java.security.SecureRandom;

import junit.framework.TestCase;
import org.bouncycastle.asn1.pkcs.Attribute;
import org.bouncycastle.asn1.pkcs.PKCSObjectIdentifiers;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.asn1.x500.X500NameBuilder;
import org.bouncycastle.asn1.x500.style.RFC4519Style;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.BasicConstraints;
import org.bouncycastle.asn1.x509.Extension;
import org.bouncycastle.asn1.x509.ExtensionsGenerator;
import org.bouncycastle.asn1.x509.KeyUsage;
import org.bouncycastle.asn1.x509.SubjectKeyIdentifier;
import org.bouncycastle.cert.bc.BcX509ExtensionUtils;
import org.bouncycastle.crypto.AsymmetricCipherKeyPair;
import org.bouncycastle.crypto.AsymmetricCipherKeyPairGenerator;
import org.bouncycastle.crypto.generators.RSAKeyPairGenerator;
import org.bouncycastle.crypto.params.AsymmetricKeyParameter;
import org.bouncycastle.crypto.params.RSAKeyGenerationParameters;
import org.bouncycastle.crypto.params.RSAKeyParameters;
import org.bouncycastle.crypto.params.RSAPrivateCrtKeyParameters;
import org.bouncycastle.operator.DefaultDigestAlgorithmIdentifierFinder;
import org.bouncycastle.operator.DefaultSignatureAlgorithmIdentifierFinder;
import org.bouncycastle.operator.bc.BcContentSignerBuilder;
import org.bouncycastle.operator.bc.BcRSAContentSignerBuilder;
import org.bouncycastle.operator.bc.BcRSAContentVerifierProviderBuilder;
import org.bouncycastle.pkcs.PKCS10CertificationRequest;
import org.bouncycastle.pkcs.PKCS10CertificationRequestBuilder;
import org.bouncycastle.pkcs.bc.BcPKCS10CertificationRequest;
import org.bouncycastle.pkcs.bc.BcPKCS10CertificationRequestBuilder;
import org.bouncycastle.util.Arrays;

public class BcPKCS10Test
    extends TestCase
{
    public String getName()
    {
        return "PKCS10CertRequest";
    }

    private void generationTest(int keySize, String keyName, String sigName)
        throws Exception
    {
        AsymmetricCipherKeyPairGenerator kpg = new RSAKeyPairGenerator();
        RSAKeyGenerationParameters genParam = new RSAKeyGenerationParameters(
                                            BigInteger.valueOf(0x1001), new SecureRandom(), keySize, 25);

        kpg.init(genParam);

        AsymmetricCipherKeyPair kp = kpg.generateKeyPair();


        X500NameBuilder x500NameBld = new X500NameBuilder(RFC4519Style.INSTANCE);

        x500NameBld.addRDN(RFC4519Style.c, "AU");
        x500NameBld.addRDN(RFC4519Style.o, "The Legion of the Bouncy Castle");
        x500NameBld.addRDN(RFC4519Style.l, "Melbourne");
        x500NameBld.addRDN(RFC4519Style.st, "Victoria");
        x500NameBld.addRDN(PKCSObjectIdentifiers.pkcs_9_at_emailAddress, "[email protected]");

        X500Name subject = x500NameBld.build();

        PKCS10CertificationRequestBuilder requestBuilder = new BcPKCS10CertificationRequestBuilder(subject, kp.getPublic());

        DefaultSignatureAlgorithmIdentifierFinder sigAlgFinder = new DefaultSignatureAlgorithmIdentifierFinder();
        DefaultDigestAlgorithmIdentifierFinder digAlgFinder = new DefaultDigestAlgorithmIdentifierFinder();

        AlgorithmIdentifier sigAlgId = sigAlgFinder.find("SHA1withRSA");

        AlgorithmIdentifier digAlgId = digAlgFinder.find(sigAlgId);

        BcContentSignerBuilder contentSignerBuilder = new BcRSAContentSignerBuilder(sigAlgId, digAlgId);

        PKCS10CertificationRequest req1 = requestBuilder.build(contentSignerBuilder.build(kp.getPrivate()));

        BcPKCS10CertificationRequest req2 = new BcPKCS10CertificationRequest(req1.getEncoded());

        if (!req2.isSignatureValid(new BcRSAContentVerifierProviderBuilder(digAlgFinder).build(kp.getPublic())))
        {
            fail(sigName + ": Failed verify check.");
        }

        if (!Arrays.areEqual(req2.getSubjectPublicKeyInfo().getEncoded(), req1.getSubjectPublicKeyInfo().getEncoded()))
        {
            fail(keyName + ": Failed public key check.");
        }
    }

    private void createPSSTest(String algorithm)
        throws Exception
    {
        AsymmetricKeyParameter pubKey = new RSAKeyParameters(
            false,
            new BigInteger("a56e4a0e701017589a5187dc7ea841d156f2ec0e36ad52a44dfeb1e61f7ad991d8c51056ffedb162b4c0f283a12a88a394dff526ab7291cbb307ceabfce0b1dfd5cd9508096d5b2b8b6df5d671ef6377c0921cb23c270a70e2598e6ff89d19f105acc2d3f0cb35f29280e1386b6f64c4ef22e1e1f20d0ce8cffb2249bd9a2137",16),
            new BigInteger("010001",16));

        AsymmetricKeyParameter privKey = new RSAPrivateCrtKeyParameters(
            new BigInteger("a56e4a0e701017589a5187dc7ea841d156f2ec0e36ad52a44dfeb1e61f7ad991d8c51056ffedb162b4c0f283a12a88a394dff526ab7291cbb307ceabfce0b1dfd5cd9508096d5b2b8b6df5d671ef6377c0921cb23c270a70e2598e6ff89d19f105acc2d3f0cb35f29280e1386b6f64c4ef22e1e1f20d0ce8cffb2249bd9a2137",16),
            new BigInteger("010001",16),
            new BigInteger("33a5042a90b27d4f5451ca9bbbd0b44771a101af884340aef9885f2a4bbe92e894a724ac3c568c8f97853ad07c0266c8c6a3ca0929f1e8f11231884429fc4d9ae55fee896a10ce707c3ed7e734e44727a39574501a532683109c2abacaba283c31b4bd2f53c3ee37e352cee34f9e503bd80c0622ad79c6dcee883547c6a3b325",16),
            new BigInteger("e7e8942720a877517273a356053ea2a1bc0c94aa72d55c6e86296b2dfc967948c0a72cbccca7eacb35706e09a1df55a1535bd9b3cc34160b3b6dcd3eda8e6443",16),
            new BigInteger("b69dca1cf7d4d7ec81e75b90fcca874abcde123fd2700180aa90479b6e48de8d67ed24f9f19d85ba275874f542cd20dc723e6963364a1f9425452b269a6799fd",16),
            new BigInteger("28fa13938655be1f8a159cbaca5a72ea190c30089e19cd274a556f36c4f6e19f554b34c077790427bbdd8dd3ede2448328f385d81b30e8e43b2fffa027861979",16),
            new BigInteger("1a8b38f398fa712049898d7fb79ee0a77668791299cdfa09efc0e507acb21ed74301ef5bfd48be455eaeb6e1678255827580a8e4e8e14151d1510a82a3f2e729",16),
            new BigInteger("27156aba4126d24a81f3a528cbfb27f56886f840a9f6e86e17a44b94fe9319584b8e22fdde1e5a2e3bd8aa5ba8d8584194eb2190acf832b847f13a3d24a79f4d",16));

        DefaultSignatureAlgorithmIdentifierFinder sigAlgFinder = new DefaultSignatureAlgorithmIdentifierFinder();
        DefaultDigestAlgorithmIdentifierFinder digAlgFinder = new DefaultDigestAlgorithmIdentifierFinder();

        AlgorithmIdentifier sigAlgId = sigAlgFinder.find(algorithm);
        AlgorithmIdentifier digAlgId = digAlgFinder.find(sigAlgId);
        BcContentSignerBuilder contentSignerBuilder = new BcRSAContentSignerBuilder(sigAlgId, digAlgId);

        PKCS10CertificationRequest req = new BcPKCS10CertificationRequestBuilder(new X500Name("CN=XXX"), pubKey).build(contentSignerBuilder.build(privKey));
        if (!req.isSignatureValid(new BcRSAContentVerifierProviderBuilder(digAlgFinder).build(pubKey)))
        {
            fail("Failed verify check PSS.");
        }

        BcPKCS10CertificationRequest bcReq = new BcPKCS10CertificationRequest(req.getEncoded());
        if (!bcReq.isSignatureValid(new BcRSAContentVerifierProviderBuilder(digAlgFinder).build(bcReq.getPublicKey())))
        {
            fail("Failed verify check PSS encoded.");
        }

        if (!bcReq.getSignatureAlgorithm().getAlgorithm().equals(PKCSObjectIdentifiers.id_RSASSA_PSS))
        {
            fail("PSS oid incorrect.");
        }

        if (bcReq.getSignatureAlgorithm().getParameters() == null)
        {
            fail("PSS parameters incorrect.");
        }
    }

     // previous code found to cause a NullPointerException
    private void nullPointerTest()
        throws Exception
    {
        AsymmetricCipherKeyPairGenerator kpg = new RSAKeyPairGenerator();
        RSAKeyGenerationParameters genParam = new RSAKeyGenerationParameters(
                                            BigInteger.valueOf(0x1001), new SecureRandom(), 1024, 25);

        kpg.init(genParam);

        AsymmetricCipherKeyPair kp = kpg.generateKeyPair();
        ExtensionsGenerator extGen = new ExtensionsGenerator();

        extGen.addExtension(Extension.basicConstraints, true, new BasicConstraints(true));
        extGen.addExtension(Extension.keyUsage, true, new KeyUsage(KeyUsage.keyCertSign | KeyUsage.cRLSign));

        BcX509ExtensionUtils extUtils = new BcX509ExtensionUtils(new SHA1DigestCalculator());

        SubjectKeyIdentifier subjectKeyIdentifier = extUtils.createSubjectKeyIdentifier(kp.getPublic());

        extGen.addExtension(Extension.subjectKeyIdentifier, false, subjectKeyIdentifier);

        DefaultSignatureAlgorithmIdentifierFinder sigAlgFinder = new DefaultSignatureAlgorithmIdentifierFinder();
        DefaultDigestAlgorithmIdentifierFinder digAlgFinder = new DefaultDigestAlgorithmIdentifierFinder();

        AlgorithmIdentifier sigAlgId = sigAlgFinder.find("SHA1withRSA");

        AlgorithmIdentifier digAlgId = digAlgFinder.find(sigAlgId);

        BcContentSignerBuilder contentSignerBuilder = new BcRSAContentSignerBuilder(sigAlgId, digAlgId);

        PKCS10CertificationRequest p1 = new BcPKCS10CertificationRequestBuilder(
            new X500Name("cn=csr"), kp.getPublic())
            .addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, extGen.generate())
            .build(contentSignerBuilder.build(kp.getPrivate()));
        PKCS10CertificationRequest p2 = new BcPKCS10CertificationRequestBuilder(
            new X500Name("cn=csr"), kp.getPublic())
            .addAttribute(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest, extGen.generate())
            .build(contentSignerBuilder.build(kp.getPrivate()));

        if (!p1.equals(p2))
        {
            fail("cert request comparison failed");
        }

        Attribute[] attr1 = p1.getAttributes();
        Attribute[] attr2 = p1.getAttributes();

        checkAttrs(1, attr1, attr2);

        attr1 = p1.getAttributes(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest);
        attr2 = p1.getAttributes(PKCSObjectIdentifiers.pkcs_9_at_extensionRequest);

        checkAttrs(1, attr1, attr2);
    }

    private void checkAttrs(int expectedLength, Attribute[] attr1, Attribute[] attr2)
    {
        if (expectedLength != attr1.length)
        {
            fail("expected length mismatch");
        }

        if (attr1.length != attr2.length)
        {
            fail("atrribute length mismatch");
        }

        for (int i = 0; i != attr1.length; i++)
        {
            if (!attr1[i].equals(attr2[i]))
            {
                fail("atrribute mismatch");
            }
        }
    }

    public void testPKCS10()
        throws Exception
    {
        generationTest(512, "RSA", "SHA1withRSA");

        createPSSTest("SHA1withRSAandMGF1");
        createPSSTest("SHA224withRSAandMGF1");
        createPSSTest("SHA256withRSAandMGF1");
        createPSSTest("SHA384withRSAandMGF1");

        nullPointerTest();
    }
}