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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 1.4. Note: this package includes the NTRU encryption algorithms.
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package org.bouncycastle.crypto.tls.test;

import java.io.IOException;
import java.io.PrintStream;
import java.util.Vector;

import org.bouncycastle.asn1.x509.Certificate;
import org.bouncycastle.crypto.tls.AlertDescription;
import org.bouncycastle.crypto.tls.AlertLevel;
import org.bouncycastle.crypto.tls.CertificateRequest;
import org.bouncycastle.crypto.tls.ClientCertificateType;
import org.bouncycastle.crypto.tls.ConnectionEnd;
import org.bouncycastle.crypto.tls.DefaultTlsServer;
import org.bouncycastle.crypto.tls.HashAlgorithm;
import org.bouncycastle.crypto.tls.ProtocolVersion;
import org.bouncycastle.crypto.tls.SignatureAlgorithm;
import org.bouncycastle.crypto.tls.SignatureAndHashAlgorithm;
import org.bouncycastle.crypto.tls.TlsEncryptionCredentials;
import org.bouncycastle.crypto.tls.TlsFatalAlert;
import org.bouncycastle.crypto.tls.TlsSignerCredentials;
import org.bouncycastle.crypto.tls.TlsUtils;

class TlsTestServerImpl
    extends DefaultTlsServer
{
    protected final TlsTestConfig config;

    protected int firstFatalAlertConnectionEnd = -1;
    protected short firstFatalAlertDescription = -1;

    TlsTestServerImpl(TlsTestConfig config)
    {
        this.config = config;
    }

    int getFirstFatalAlertConnectionEnd()
    {
        return firstFatalAlertConnectionEnd;
    }

    short getFirstFatalAlertDescription()
    {
        return firstFatalAlertDescription;
    }

    protected ProtocolVersion getMaximumVersion()
    {
        if (config.serverMaximumVersion != null)
        {
            return config.serverMaximumVersion;
        }

        return super.getMaximumVersion();
    }

    protected ProtocolVersion getMinimumVersion()
    {
        if (config.serverMinimumVersion != null)
        {
            return config.serverMinimumVersion;
        }

        return super.getMinimumVersion();
    }

    public void notifyAlertRaised(short alertLevel, short alertDescription, String message, Exception cause)
    {
        if (alertLevel == AlertLevel.fatal && firstFatalAlertConnectionEnd == -1)
        {
            firstFatalAlertConnectionEnd = ConnectionEnd.server;
            firstFatalAlertDescription = alertDescription;
        }

        if (TlsTestConfig.DEBUG)
        {
            PrintStream out = (alertLevel == AlertLevel.fatal) ? System.err : System.out;
            out.println("TLS server raised alert (AlertLevel." + alertLevel + ", AlertDescription." + alertDescription
                + ")");
            if (message != null)
            {
                out.println("> " + message);
            }
            if (cause != null)
            {
                cause.printStackTrace(out);
            }
        }
    }

    public void notifyAlertReceived(short alertLevel, short alertDescription)
    {
        if (alertLevel == AlertLevel.fatal && firstFatalAlertConnectionEnd == -1)
        {
            firstFatalAlertConnectionEnd = ConnectionEnd.client;
            firstFatalAlertDescription = alertDescription;
        }

        if (TlsTestConfig.DEBUG)
        {
            PrintStream out = (alertLevel == AlertLevel.fatal) ? System.err : System.out;
            out.println("TLS server received alert (AlertLevel." + alertLevel + ", AlertDescription."
                + alertDescription + ")");
        }
    }

    public ProtocolVersion getServerVersion() throws IOException
    {
        ProtocolVersion serverVersion = super.getServerVersion();

        if (TlsTestConfig.DEBUG)
        {
            System.out.println("TLS server negotiated " + serverVersion);
        }

        return serverVersion;
    }

    public CertificateRequest getCertificateRequest() throws IOException
    {
        if (config.serverCertReq == TlsTestConfig.SERVER_CERT_REQ_NONE)
        {
            return null;
        }

        Vector serverSigAlgs = null;

        if (TlsUtils.isSignatureAlgorithmsExtensionAllowed(serverVersion))
        {
            short[] hashAlgorithms = new short[]{ HashAlgorithm.sha512, HashAlgorithm.sha384, HashAlgorithm.sha256,
                HashAlgorithm.sha224, HashAlgorithm.sha1 };
            short[] signatureAlgorithms = new short[]{ SignatureAlgorithm.rsa };

            serverSigAlgs = new Vector();
            for (int i = 0; i < hashAlgorithms.length; ++i)
            {
                for (int j = 0; j < signatureAlgorithms.length; ++j)
                {
                    serverSigAlgs.addElement(new SignatureAndHashAlgorithm(hashAlgorithms[i],
                        signatureAlgorithms[j]));
                }
            }
        }

        Vector certificateAuthorities = new Vector();
        certificateAuthorities.add(TlsTestUtils.loadCertificateResource("x509-ca.pem").getSubject());

        return new CertificateRequest(new short[]{ ClientCertificateType.rsa_sign }, serverSigAlgs, certificateAuthorities);
    }

    public void notifyClientCertificate(org.bouncycastle.crypto.tls.Certificate clientCertificate)
        throws IOException
    {
        boolean isEmpty = (clientCertificate == null || clientCertificate.isEmpty());

        if (isEmpty != (config.clientAuth == TlsTestConfig.CLIENT_AUTH_NONE))
        {
            throw new IllegalStateException();
        }
        if (isEmpty && (config.serverCertReq == TlsTestConfig.SERVER_CERT_REQ_MANDATORY))
        {
            throw new TlsFatalAlert(AlertDescription.handshake_failure);
        }

        Certificate[] chain = clientCertificate.getCertificateList();

        if (!isEmpty && !chain[0].equals(TlsTestUtils.loadCertificateResource("x509-client.pem")))
        {
            throw new TlsFatalAlert(AlertDescription.bad_certificate);
        }

        if (TlsTestConfig.DEBUG)
        {
            System.out.println("TLS server received client certificate chain of length " + chain.length);
            for (int i = 0; i != chain.length; i++)
            {
                Certificate entry = chain[i];
                // TODO Create fingerprint based on certificate signature algorithm digest
                System.out.println("    fingerprint:SHA-256 " + TlsTestUtils.fingerprint(entry) + " ("
                    + entry.getSubject() + ")");
            }
        }
    }

    protected TlsEncryptionCredentials getRSAEncryptionCredentials()
        throws IOException
    {
        return TlsTestUtils.loadEncryptionCredentials(context, new String[]{"x509-server.pem", "x509-ca.pem"},
            "x509-server-key.pem");
    }

    protected TlsSignerCredentials getRSASignerCredentials()
        throws IOException
    {
        /*
         * TODO Note that this code fails to provide default value for the client supported
         * algorithms if it wasn't sent.
         */
        SignatureAndHashAlgorithm signatureAndHashAlgorithm = null;
        Vector sigAlgs = supportedSignatureAlgorithms;
        if (sigAlgs != null)
        {
            for (int i = 0; i < sigAlgs.size(); ++i)
            {
                SignatureAndHashAlgorithm sigAlg = (SignatureAndHashAlgorithm)
                    sigAlgs.elementAt(i);
                if (sigAlg.getSignature() == SignatureAlgorithm.rsa)
                {
                    signatureAndHashAlgorithm = sigAlg;
                    break;
                }
            }

            if (signatureAndHashAlgorithm == null)
            {
                return null;
            }
        }

        return TlsTestUtils.loadSignerCredentials(context, new String[]{"x509-server.pem", "x509-ca.pem"},
            "x509-server-key.pem", signatureAndHashAlgorithm);
    }
}