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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.jsse.provider;

import java.net.Socket;
import java.util.Collections;
import java.util.List;

import javax.net.ssl.SSLEngine;
import javax.net.ssl.SSLSocket;

import org.bouncycastle.jsse.BCExtendedSSLSession;
import org.bouncycastle.jsse.BCSSLParameters;
import org.bouncycastle.jsse.java.security.BCAlgorithmConstraints;

class TransportData
{
    static TransportData from(Socket socket)
    {
        if (!(socket instanceof SSLSocket && socket.isConnected()))
        {
            return null;
        }

        SSLSocket sslSocket = (SSLSocket)socket;

        BCSSLParameters parameters = SSLSocketUtil.importSSLParameters(sslSocket);
        if (null == parameters)
        {
            /*
             * NOTE: For non-BCJSSE sockets, this could be null before JDK 1.6 (meaning neither
             * parameters nor handshake session exist). For backward compatibility, our
             * KeyManager/TrustManager implementations will behave as if no transport was provided.
             */
            return null;
        }

        BCExtendedSSLSession handshakeSession = SSLSocketUtil.importHandshakeSession(sslSocket);

        return new TransportData(parameters, handshakeSession);
    }

    static TransportData from(SSLEngine engine)
    {
        if (null == engine)
        {
            return null;
        }

        BCSSLParameters parameters = SSLEngineUtil.importSSLParameters(engine);
        if (null == parameters)
        {
            /*
             * NOTE: For non-BCJSSE engines, this could be null before JDK 1.6 (meaning neither
             * parameters nor handshake session exist). For backward compatibility, our
             * KeyManager/TrustManager implementations will behave as if no transport was provided.
             */
            return null;
        }

        BCExtendedSSLSession handshakeSession = SSLEngineUtil.importHandshakeSession(engine);

        return new TransportData(parameters, handshakeSession);
    }

    static BCAlgorithmConstraints getAlgorithmConstraints(TransportData transportData, boolean peerSigAlgs)
    {
        return null == transportData
            ?   ProvAlgorithmConstraints.DEFAULT
            :   transportData.getAlgorithmConstraints(peerSigAlgs);
    }

    static List getStatusResponses(TransportData transportData)
    {
        return null == transportData
            ?   Collections. emptyList()
            :   transportData.getStatusResponses();
    }

    private final BCSSLParameters parameters;
    private final BCExtendedSSLSession handshakeSession;

    private TransportData(BCSSLParameters parameters, BCExtendedSSLSession handshakeSession)
    {
        this.parameters = parameters;
        this.handshakeSession = handshakeSession;
    }

    BCSSLParameters getParameters()
    {
        return parameters;
    }

    BCExtendedSSLSession getHandshakeSession()
    {
        return handshakeSession;
    }

    BCAlgorithmConstraints getAlgorithmConstraints(boolean peerSigAlgs)
    {
        BCAlgorithmConstraints configAlgorithmConstraints = parameters.getAlgorithmConstraints();
        if (ProvAlgorithmConstraints.DEFAULT == configAlgorithmConstraints)
        {
            configAlgorithmConstraints = null;
        }

        if (null != handshakeSession && JsseUtils.isTLSv12(handshakeSession.getProtocol()))
        {
            String[] sigAlgsCert = peerSigAlgs
                ?   handshakeSession.getPeerSupportedSignatureAlgorithmsBC()
                :   handshakeSession.getLocalSupportedSignatureAlgorithmsBC();

            if (null != sigAlgsCert)
            {
                return new ProvAlgorithmConstraints(configAlgorithmConstraints, sigAlgsCert, true);
            }
        }

        return null == configAlgorithmConstraints
            ?   ProvAlgorithmConstraints.DEFAULT
            :   new ProvAlgorithmConstraints(configAlgorithmConstraints, true);
    }

    List getStatusResponses()
    {
        return null == handshakeSession
            ?   Collections. emptyList()
            :   handshakeSession.getStatusResponses();
    }
}