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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 SRPTlsServer
    extends AbstractTlsServer
{
    private static final int[] DEFAULT_CIPHER_SUITES = new int[]
    {
        CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_256_CBC_SHA,
        CipherSuite.TLS_SRP_SHA_DSS_WITH_AES_128_CBC_SHA,
        CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_256_CBC_SHA,
        CipherSuite.TLS_SRP_SHA_RSA_WITH_AES_128_CBC_SHA,
        CipherSuite.TLS_SRP_SHA_WITH_AES_256_CBC_SHA,
        CipherSuite.TLS_SRP_SHA_WITH_AES_128_CBC_SHA
    };

    protected TlsSRPIdentityManager srpIdentityManager;

    protected byte[] srpIdentity = null;
    protected TlsSRPLoginParameters srpLoginParameters = null;

    public SRPTlsServer(TlsCrypto crypto, TlsSRPIdentityManager srpIdentityManager)
    {
        super(crypto);

        this.srpIdentityManager = srpIdentityManager;
    }

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

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

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

    public ProtocolVersion getMaximumVersion()
    {
        // TODO[tls13] Consider whether this class should offer TLSv13
        return ProtocolVersion.TLSv12;
    }

    public void processClientExtensions(Hashtable clientExtensions) throws IOException
    {
        super.processClientExtensions(clientExtensions);

        this.srpIdentity = TlsSRPUtils.getSRPExtension(clientExtensions);
    }

    public int getSelectedCipherSuite() throws IOException
    {
        int cipherSuite = super.getSelectedCipherSuite();

        if (TlsSRPUtils.isSRPCipherSuite(cipherSuite))
        {
            if (srpIdentity != null)
            {
                this.srpLoginParameters = srpIdentityManager.getLoginParameters(srpIdentity);
            }

            if (srpLoginParameters == null)
            {
                throw new TlsFatalAlert(AlertDescription.unknown_psk_identity);
            }
        }

        return cipherSuite;
    }

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

        switch (keyExchangeAlgorithm)
        {
        case KeyExchangeAlgorithm.SRP:
            return null;

        case KeyExchangeAlgorithm.SRP_DSS:
            return getDSASignerCredentials();

        case KeyExchangeAlgorithm.SRP_RSA:
            return getRSASignerCredentials();

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

    public TlsSRPLoginParameters getSRPLoginParameters() throws IOException
    {
        return srpLoginParameters;
    }
}