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The Bouncy Castle Java APIs for the TLS, including a JSSE provider. The APIs are designed primarily to be used in conjunction with the BC FIPS provider. The APIs may also be used with other providers although if being used in a FIPS context it is the responsibility of the user to ensure that any other providers used are FIPS certified and used appropriately.

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package org.bouncycastle.tls;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ocsp.OCSPResponse;

public class CertificateStatus
{
    protected short statusType;
    protected Object response;

    public CertificateStatus(short statusType, Object response)
    {
        if (!isCorrectType(statusType, response))
        {
            throw new IllegalArgumentException("'response' is not an instance of the correct type");
        }
        
        this.statusType = statusType;
        this.response = response;
    }

    public short getStatusType()
    {
        return statusType;
    }

    public Object getResponse()
    {
        return response;
    }

    public OCSPResponse getOCSPResponse()
    {
        if (!isCorrectType(CertificateStatusType.ocsp, response))
        {
            throw new IllegalStateException("'response' is not an OCSPResponse");
        }
        return (OCSPResponse)response;
    }

    /**
     * Encode this {@link CertificateStatus} to an {@link OutputStream}.
     * 
     * @param output
     *            the {@link OutputStream} to encode to.
     * @throws IOException
     */
    public void encode(OutputStream output) throws IOException
    {
        TlsUtils.writeUint8(statusType, output);

        switch (statusType)
        {
        case CertificateStatusType.ocsp:
            byte[] derEncoding = ((OCSPResponse) response).getEncoded(ASN1Encoding.DER);
            TlsUtils.writeOpaque24(derEncoding, output);
            break;
        default:
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }

    /**
     * Parse a {@link CertificateStatus} from an {@link InputStream}.
     * 
     * @param input
     *            the {@link InputStream} to parse from.
     * @return a {@link CertificateStatus} object.
     * @throws IOException
     */
    public static CertificateStatus parse(InputStream input) throws IOException
    {
        short status_type = TlsUtils.readUint8(input);
        Object response;

        switch (status_type)
        {
        case CertificateStatusType.ocsp:
        {
            byte[] derEncoding = TlsUtils.readOpaque24(input);
            response = OCSPResponse.getInstance(TlsUtils.readDERObject(derEncoding));
            break;
        }
        default:
            throw new TlsFatalAlert(AlertDescription.decode_error);
        }

        return new CertificateStatus(status_type, response);
    }

    protected static boolean isCorrectType(short statusType, Object response)
    {
        switch (statusType)
        {
        case CertificateStatusType.ocsp:
            return response instanceof OCSPResponse;
        default:
            throw new IllegalArgumentException("'statusType' is an unsupported CertificateStatusType");
        }
    }
}