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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.math.BigInteger;
import java.security.cert.X509CertSelector;

import junit.framework.Test;
import junit.framework.TestCase;
import junit.framework.TestSuite;
import org.bouncycastle.asn1.DEROctetString;
import org.bouncycastle.asn1.x500.X500Name;
import org.bouncycastle.cms.KeyTransRecipientId;
import org.bouncycastle.cms.SignerId;
import org.bouncycastle.cms.jcajce.JcaSelectorConverter;
import org.bouncycastle.cms.jcajce.JcaX509CertSelectorConverter;
import org.bouncycastle.util.Arrays;

public class ConverterTest
    extends TestCase
{
    public void testSignerIdConversion()
        throws Exception
    {
        JcaX509CertSelectorConverter converter = new JcaX509CertSelectorConverter();
        JcaSelectorConverter toSelector = new JcaSelectorConverter();

        SignerId sid1 = new SignerId(new X500Name("CN=Test"), BigInteger.valueOf(1), new byte[20]);

        X509CertSelector conv = converter.getCertSelector(sid1);

        assertTrue(conv.getIssuerAsString().equals("CN=Test"));
        assertTrue(Arrays.areEqual(conv.getSubjectKeyIdentifier(), new DEROctetString(new byte[20]).getEncoded()));
        assertEquals(conv.getSerialNumber(), sid1.getSerialNumber());

        SignerId sid2 = toSelector.getSignerId(conv);

        assertEquals(sid1, sid2);

        sid1 = new SignerId(new X500Name("CN=Test"), BigInteger.valueOf(1));

        conv = converter.getCertSelector(sid1);

        assertTrue(conv.getIssuerAsString().equals("CN=Test"));
        assertNull(conv.getSubjectKeyIdentifier());
        assertEquals(conv.getSerialNumber(), sid1.getSerialNumber());

        sid2 = toSelector.getSignerId(conv);

        assertEquals(sid1, sid2);

        sid1 = new SignerId(new byte[20]);

        conv = converter.getCertSelector(sid1);

        assertNull(conv.getIssuerAsString());
        assertTrue(Arrays.areEqual(conv.getSubjectKeyIdentifier(), new DEROctetString(new byte[20]).getEncoded()));
        assertNull(conv.getSerialNumber());

        sid2 = toSelector.getSignerId(conv);

        assertEquals(sid1, sid2);
    }

    public void testRecipientIdConversion()
        throws Exception
    {
        JcaX509CertSelectorConverter converter = new JcaX509CertSelectorConverter();
        JcaSelectorConverter toSelector = new JcaSelectorConverter();

        KeyTransRecipientId ktid1 = new KeyTransRecipientId(new X500Name("CN=Test"), BigInteger.valueOf(1), new byte[20]);

        X509CertSelector conv = converter.getCertSelector(ktid1);

        assertTrue(conv.getIssuerAsString().equals("CN=Test"));
        assertTrue(Arrays.areEqual(conv.getSubjectKeyIdentifier(), new DEROctetString(new byte[20]).getEncoded()));
        assertEquals(conv.getSerialNumber(), ktid1.getSerialNumber());

        KeyTransRecipientId ktid2 = toSelector.getKeyTransRecipientId(conv);

        assertEquals(ktid1, ktid2);

        ktid1 = new KeyTransRecipientId(new X500Name("CN=Test"), BigInteger.valueOf(1));

        conv = converter.getCertSelector(ktid1);

        assertTrue(conv.getIssuerAsString().equals("CN=Test"));
        assertNull(conv.getSubjectKeyIdentifier());
        assertEquals(conv.getSerialNumber(), ktid1.getSerialNumber());

        ktid2 = toSelector.getKeyTransRecipientId(conv);

        assertEquals(ktid1, ktid2);

        ktid1 = new KeyTransRecipientId(new byte[20]);

        conv = converter.getCertSelector(ktid1);

        assertNull(conv.getIssuerAsString());
        assertTrue(Arrays.areEqual(conv.getSubjectKeyIdentifier(), new DEROctetString(new byte[20]).getEncoded()));
        assertNull(conv.getSerialNumber());

        ktid2 = toSelector.getKeyTransRecipientId(conv);

        assertEquals(ktid1, ktid2);
    }

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