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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;

/**
 * Base class for supporting a TLS key exchange implementation.
 */
public abstract class AbstractTlsKeyExchange
    implements TlsKeyExchange
{
    protected int keyExchange;

    protected TlsContext context;

    protected AbstractTlsKeyExchange(int keyExchange)
    {
        this.keyExchange = keyExchange;
    }

    public void init(TlsContext context)
    {
        this.context = context;
    }

    public void processServerCertificate(Certificate serverCertificate) throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    public boolean requiresServerKeyExchange()
    {
        return false;
    }

    public byte[] generateServerKeyExchange()
        throws IOException
    {
        if (requiresServerKeyExchange())
        {
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
        return null;
    }

    public void skipServerKeyExchange()
        throws IOException
    {
        if (requiresServerKeyExchange())
        {
            throw new TlsFatalAlert(AlertDescription.unexpected_message);
        }
    }

    public void processServerKeyExchange(InputStream input)
        throws IOException
    {
        if (!requiresServerKeyExchange())
        {
            throw new TlsFatalAlert(AlertDescription.unexpected_message);
        }
    }

    public short[] getClientCertificateTypes()
    {
        return null;
    }

    public void skipClientCredentials() throws IOException
    {
    }

    public void processClientCertificate(Certificate clientCertificate)
        throws IOException
    {
    }

    public void processClientKeyExchange(InputStream input)
        throws IOException
    {
        // Key exchange implementation MUST support client key exchange
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    public boolean requiresCertificateVerify()
    {
        return true;
    }
}