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/*
* Copyright (C) 2010 Martin Willi
* Copyright (C) 2010 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup tls_handshake tls_handshake
* @{ @ingroup libtls
*/
#ifndef TLS_HANDSHAKE_H_
#define TLS_HANDSHAKE_H_
typedef struct tls_handshake_t tls_handshake_t;
#include "tls.h"
#include <bio/bio_reader.h>
#include <bio/bio_writer.h>
/**
* TLS handshake state machine interface.
*/
struct tls_handshake_t {
/**
* Process received TLS handshake message.
*
* @param type TLS handshake message type
* @param reader TLS data buffer
* @return
* - SUCCESS if TLS negotiation complete
* - FAILED if a fatal TLS alert queued
* - NEED_MORE if more invocations to process/build needed
* - DESTROY_ME if a fatal TLS alert received
*/
status_t (*process)(tls_handshake_t *this,
tls_handshake_type_t type, bio_reader_t *reader);
/**
* Build TLS handshake messages to send out.
*
* @param type type of created handshake message
* @param writer TLS data buffer to write to
* @return
* - SUCCESS if handshake complete
* - FAILED if handshake failed
* - NEED_MORE if more messages ready for delivery
* - INVALID_STATE if more input to process() required
*/
status_t (*build)(tls_handshake_t *this,
tls_handshake_type_t *type, bio_writer_t *writer);
/**
* Check if the cipher spec should be changed for outgoing messages.
*
* @param inbound TRUE to check for inbound cipherspec change
* @return TRUE if cipher spec should be changed
*/
bool (*cipherspec_changed)(tls_handshake_t *this, bool inbound);
/**
* Change the cipher for a direction.
*
* @param inbound TRUE to change inbound cipherspec, FALSE for outbound
*/
void (*change_cipherspec)(tls_handshake_t *this, bool inbound);
/**
* Check if the finished message was decoded successfully.
*
* @return TRUE if finished message was decoded successfully
*/
bool (*finished)(tls_handshake_t *this);
/**
* Destroy a tls_handshake_t.
*/
void (*destroy)(tls_handshake_t *this);
};
#endif /** TLS_HANDSHAKE_H_ @}*/
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