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The Bouncy Castle Java APIs for TLS and DTLS, including a provider for the JSSE.

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package org.bouncycastle.jsse;

/**
 * A BCJSSE-specific interface providing access to extended connection-specific functionality.
 */
public interface BCSSLConnection
{
    /**
     * Returns the application protocol negotiated for this connection, or an empty {@code String}
     * if none was negotiated. See RFC 7301 for
     * details.
     * 
     * @return The negotiated application protocol, or an empty {@code String}.
     */
    String getApplicationProtocol();

    /**
     * Request TLS Channel Bindings for this connection. See
     * RFC 5929 for details.
     * 
     * @param channelBinding
     *            An IANA-registered "Channel-binding unique prefix" valid for TLS e.g.
     *            "tls-unique" or "tls-server-end-point".
     * @return A copy of the channel binding data as a {@link byte[]}, or null if the binding is
     *         unavailable for this connection.
     */
    byte[] getChannelBinding(String channelBinding);

    /**
     * Return a String that uniquely identifies this connection during its lifetime within the current process. It
     * can be used e.g. for logging but its contents and format are subject to change and should not be relied upon.
     * @return A String identifying this connection.
     */
    String getID();

    /**
     * Returns the SSL session in use by this connection
     * @return The {@link BCExtendedSSLSession}.
     */
    BCExtendedSSLSession getSession();
}