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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.io.InputStream;
import java.io.OutputStream;

import org.bouncycastle.tls.crypto.TlsSecret;

/**
 * A generic interface for key exchange implementations in (D)TLS.
 */
public interface TlsKeyExchange
{
    void init(TlsContext context);

    void skipServerCredentials()
        throws IOException;

    void processServerCredentials(TlsCredentials serverCredentials)
        throws IOException;

    void processServerCertificate(Certificate serverCertificate)
        throws IOException;

    boolean requiresServerKeyExchange();

    byte[] generateServerKeyExchange()
        throws IOException;

    void skipServerKeyExchange()
        throws IOException;

    void processServerKeyExchange(InputStream input)
        throws IOException;

    short[] getClientCertificateTypes();

    void skipClientCredentials()
        throws IOException;

    void processClientCredentials(TlsCredentials clientCredentials)
        throws IOException;

    void processClientCertificate(Certificate clientCertificate)
        throws IOException;

    void generateClientKeyExchange(OutputStream output)
        throws IOException;

    void processClientKeyExchange(InputStream input)
        throws IOException;

    boolean requiresCertificateVerify();

    TlsSecret generatePreMasterSecret()
        throws IOException;
}