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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;
import org.bouncycastle.util.Arrays;

public class SRPTlsServer
    extends AbstractTlsServer
{
    // TODO[tls] Perhaps not ideal to keep this in a writable array
    public static final int[] BASE_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 int[] supportedCipherSuites;

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

    // TODO[tls-ops] Need to restore a single-arg constructor here

    public SRPTlsServer(TlsCrypto crypto, TlsSRPIdentityManager srpIdentityManager)
    {
        this(crypto, new DefaultTlsKeyExchangeFactory(), srpIdentityManager);
    }

    public SRPTlsServer(TlsCrypto crypto, TlsKeyExchangeFactory keyExchangeFactory, TlsSRPIdentityManager srpIdentityManager)
    {
        super(crypto, keyExchangeFactory);
        this.srpIdentityManager = srpIdentityManager;
        this.supportedCipherSuites = TlsUtils.getSupportedCipherSuites(crypto, BASE_CIPHER_SUITES);
    }

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

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

    protected int[] getCipherSuites()
    {
        return Arrays.clone(supportedCipherSuites);
    }

    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.loginParameters = srpIdentityManager.getLoginParameters(srpIdentity);
            }

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

        switch (keyExchangeAlgorithm)
        {
        case KeyExchangeAlgorithm.SRP:
        case KeyExchangeAlgorithm.SRP_DSS:
        case KeyExchangeAlgorithm.SRP_RSA:
            return createSRPKeyExchange(keyExchangeAlgorithm);

        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 createSRPKeyExchange(int keyExchange) throws IOException
    {
        return keyExchangeFactory.createSRPKeyExchangeServer(keyExchange, supportedSignatureAlgorithms, srpIdentity, loginParameters);
    }
}