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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.

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package org.bouncycastle.asn1.test;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1String;
import org.bouncycastle.asn1.DERSequence;
import org.bouncycastle.asn1.x500.DirectoryString;
import org.bouncycastle.asn1.x509.sigi.NameOrPseudonym;

public class NameOrPseudonymUnitTest
    extends ASN1UnitTest
{
    public String getName()
    {
        return "NameOrPseudonym";
    }

    public void performTest()
        throws Exception
    {
        String          pseudonym = "pseudonym";
        DirectoryString surname = new DirectoryString("surname");
        ASN1Sequence    givenName = new DERSequence(new DirectoryString("givenName"));

        NameOrPseudonym id = new NameOrPseudonym(pseudonym);

        checkConstruction(id, pseudonym, null, null);

        id = new NameOrPseudonym(surname, givenName);

        checkConstruction(id, null, surname, givenName);

        id = NameOrPseudonym.getInstance(null);

        if (id != null)
        {
            fail("null getInstance() failed.");
        }

        try
        {
            NameOrPseudonym.getInstance(new Object());

            fail("getInstance() failed to detect bad object.");
        }
        catch (IllegalArgumentException e)
        {
            // expected
        }
    }

    private void checkConstruction(
        NameOrPseudonym id,
        String          pseudonym,
        DirectoryString surname,
        ASN1Sequence    givenName)
        throws IOException
    {
        checkValues(id, pseudonym, surname, givenName);

        id = NameOrPseudonym.getInstance(id);

        checkValues(id, pseudonym, surname, givenName);

        ASN1InputStream aIn = new ASN1InputStream(id.toASN1Primitive().getEncoded());

        if (surname != null)
        {
            ASN1Sequence seq = (ASN1Sequence)aIn.readObject();

            id = NameOrPseudonym.getInstance(seq);
        }
        else
        {
            ASN1String s = (ASN1String)aIn.readObject();

            id = NameOrPseudonym.getInstance(s);
        }

        checkValues(id, pseudonym, surname, givenName);
    }

    private void checkValues(
        NameOrPseudonym id,
        String          pseudonym,
        DirectoryString surname,
        ASN1Sequence    givenName)
    {

        if (surname != null)
        {
            checkMandatoryField("surname", surname, id.getSurname());
            checkMandatoryField("givenName", givenName, new DERSequence(id.getGivenName()[0]));
        }
        else
        {
            checkOptionalField("pseudonym", new DirectoryString(pseudonym), id.getPseudonym());
        }
    }

    public static void main(
        String[]    args)
    {
        runTest(new NameOrPseudonymUnitTest());
    }
}