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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.util.Hashtable;

import org.bouncycastle.tls.crypto.TlsCrypto;

public class SRPTlsClient
    extends AbstractTlsClient
{
    private static final int[] DEFAULT_CIPHER_SUITES = new int[]
    {
        CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA
    };

    protected TlsSRPIdentity srpIdentity;

    public SRPTlsClient(TlsCrypto crypto, byte[] identity, byte[] password)
    {
        this(crypto, new BasicTlsSRPIdentity(identity, password));
    }

    public SRPTlsClient(TlsCrypto crypto, TlsSRPIdentity srpIdentity)
    {
        super(crypto);

        this.srpIdentity = srpIdentity;
    }

    protected int[] getSupportedCipherSuites()
    {
        return TlsUtils.getSupportedCipherSuites(getCrypto(), DEFAULT_CIPHER_SUITES);
    }

    protected ProtocolVersion[] getSupportedVersions()
    {
        return ProtocolVersion.TLSv12.only();
    }

    protected boolean requireSRPServerExtension()
    {
        // No explicit guidance in RFC 5054; by default an (empty) extension from server is optional
        return false;
    }

    public Hashtable getClientExtensions()
        throws IOException
    {
        Hashtable clientExtensions = TlsExtensionsUtils.ensureExtensionsInitialised(super.getClientExtensions());
        TlsSRPUtils.addSRPExtension(clientExtensions, srpIdentity.getSRPIdentity());
        return clientExtensions;
    }

    public void processServerExtensions(Hashtable serverExtensions)
        throws IOException
    {
        if (!TlsUtils.hasExpectedEmptyExtensionData(serverExtensions, TlsSRPUtils.EXT_SRP,
            AlertDescription.illegal_parameter))
        {
            if (requireSRPServerExtension())
            {
                throw new TlsFatalAlert(AlertDescription.illegal_parameter);
            }
        }

        super.processServerExtensions(serverExtensions);
    }

    public TlsSRPIdentity getSRPIdentity()
    {
        return srpIdentity;
    }

    public TlsAuthentication getAuthentication() throws IOException
    {
        /*
         * Note: This method is not called unless a server certificate is sent, which may be the
         * case e.g. for SRP_DSS or SRP_RSA key exchange.
         */
        throw new TlsFatalAlert(AlertDescription.internal_error);
    }
}