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

import java.io.IOException;

import org.bouncycastle.crypto.agreement.DHStandardGroups;
import org.bouncycastle.crypto.params.DHParameters;

public abstract class DefaultTlsServer
    extends AbstractTlsServer
{
    public DefaultTlsServer()
    {
        super();
    }

    public DefaultTlsServer(TlsCipherFactory cipherFactory)
    {
        super(cipherFactory);
    }

    protected TlsSignerCredentials getDSASignerCredentials()
        throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    protected TlsSignerCredentials getECDSASignerCredentials()
        throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    protected TlsEncryptionCredentials getRSAEncryptionCredentials()
        throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    protected TlsSignerCredentials getRSASignerCredentials()
        throws IOException
    {
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }

    protected DHParameters getDHParameters()
    {
        return DHStandardGroups.rfc3526_2048;
    }

    protected int[] getCipherSuites()
    {
        return new int[]
        {
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384,
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
            CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
            CipherSuite.TLS_DHE_RSA_WITH_AES_256_GCM_SHA384,
            CipherSuite.TLS_DHE_RSA_WITH_AES_128_GCM_SHA256,
            CipherSuite.TLS_DHE_RSA_WITH_AES_256_CBC_SHA256,
            CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA256,
            CipherSuite.TLS_DHE_RSA_WITH_AES_256_CBC_SHA,
            CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
            CipherSuite.TLS_RSA_WITH_AES_256_GCM_SHA384,
            CipherSuite.TLS_RSA_WITH_AES_128_GCM_SHA256,
            CipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA256,
            CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA256,
            CipherSuite.TLS_RSA_WITH_AES_256_CBC_SHA,
            CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
        };
    }

    public TlsCredentials getCredentials()
        throws IOException
    {
        int keyExchangeAlgorithm = TlsUtils.getKeyExchangeAlgorithm(selectedCipherSuite);

        switch (keyExchangeAlgorithm)
        {
        case KeyExchangeAlgorithm.DHE_DSS:
            return getDSASignerCredentials();

        case KeyExchangeAlgorithm.DH_anon:
        case KeyExchangeAlgorithm.ECDH_anon:
            return null;

        case KeyExchangeAlgorithm.ECDHE_ECDSA:
            return getECDSASignerCredentials();

        case KeyExchangeAlgorithm.DHE_RSA:
        case KeyExchangeAlgorithm.ECDHE_RSA:
            return getRSASignerCredentials();

        case KeyExchangeAlgorithm.RSA:
            return getRSAEncryptionCredentials();

        default:
            /* Note: internal error here; selected a key exchange we don't implement! */
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }

    public TlsKeyExchange getKeyExchange()
        throws IOException
    {
        int keyExchangeAlgorithm = TlsUtils.getKeyExchangeAlgorithm(selectedCipherSuite);

        switch (keyExchangeAlgorithm)
        {
        case KeyExchangeAlgorithm.DH_anon:
        case KeyExchangeAlgorithm.DH_DSS:
        case KeyExchangeAlgorithm.DH_RSA:
            return createDHKeyExchange(keyExchangeAlgorithm);

        case KeyExchangeAlgorithm.DHE_DSS:
        case KeyExchangeAlgorithm.DHE_RSA:
            return createDHEKeyExchange(keyExchangeAlgorithm);

        case KeyExchangeAlgorithm.ECDH_anon:
        case KeyExchangeAlgorithm.ECDH_ECDSA:
        case KeyExchangeAlgorithm.ECDH_RSA:
            return createECDHKeyExchange(keyExchangeAlgorithm);

        case KeyExchangeAlgorithm.ECDHE_ECDSA:
        case KeyExchangeAlgorithm.ECDHE_RSA:
            return createECDHEKeyExchange(keyExchangeAlgorithm);

        case KeyExchangeAlgorithm.RSA:
            return createRSAKeyExchange();

        default:
            /*
             * Note: internal error here; the TlsProtocol implementation verifies that the
             * server-selected cipher suite was in the list of client-offered cipher suites, so if
             * we now can't produce an implementation, we shouldn't have offered it!
             */
            throw new TlsFatalAlert(AlertDescription.internal_error);
        }
    }

    protected TlsKeyExchange createDHKeyExchange(int keyExchange)
    {
        return new TlsDHKeyExchange(keyExchange, supportedSignatureAlgorithms, getDHParameters());
    }

    protected TlsKeyExchange createDHEKeyExchange(int keyExchange)
    {
        return new TlsDHEKeyExchange(keyExchange, supportedSignatureAlgorithms, getDHParameters());
    }

    protected TlsKeyExchange createECDHKeyExchange(int keyExchange)
    {
        return new TlsECDHKeyExchange(keyExchange, supportedSignatureAlgorithms, namedCurves, clientECPointFormats,
            serverECPointFormats);
    }

    protected TlsKeyExchange createECDHEKeyExchange(int keyExchange)
    {
        return new TlsECDHEKeyExchange(keyExchange, supportedSignatureAlgorithms, namedCurves, clientECPointFormats,
            serverECPointFormats);
    }

    protected TlsKeyExchange createRSAKeyExchange()
    {
        return new TlsRSAKeyExchange(supportedSignatureAlgorithms);
    }
}