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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.asn1.test;

import java.io.IOException;

import org.bouncycastle.asn1.ASN1InputStream;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ess.OtherCertID;
import org.bouncycastle.asn1.ess.OtherSigningCertificate;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;

public class OtherSigningCertificateUnitTest
    extends ASN1UnitTest
{
    public String getName()
    {
        return "OtherSigningCertificate";
    }

    public void performTest()
        throws Exception
    {
        AlgorithmIdentifier algId = new AlgorithmIdentifier(new ASN1ObjectIdentifier("1.2.2.3"));
        byte[]              digest = new byte[20];
        OtherCertID         otherCertID = new OtherCertID(algId, digest);

        OtherSigningCertificate otherCert = new OtherSigningCertificate(otherCertID);

        checkConstruction(otherCert, otherCertID);

        otherCert = OtherSigningCertificate.getInstance(null);

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

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

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

    private void checkConstruction(
        OtherSigningCertificate otherCert,
        OtherCertID otherCertID)
        throws IOException
    {
        checkValues(otherCert, otherCertID);

        otherCert = OtherSigningCertificate.getInstance(otherCert);

        checkValues(otherCert, otherCertID);

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

        ASN1Sequence seq = (ASN1Sequence)aIn.readObject();

        otherCert = OtherSigningCertificate.getInstance(seq);

        checkValues(otherCert, otherCertID);
    }

    private void checkValues(
        OtherSigningCertificate otherCert,
        OtherCertID otherCertID)
    {
        if (otherCert.getCerts().length != 1)
        {
            fail("getCerts() length wrong");
        }
        checkMandatoryField("getCerts()[0]", otherCertID, otherCert.getCerts()[0]);
    }

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