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/*
* Off-the-Record Messaging library
* Copyright (C) 2004-2012 Ian Goldberg, Chris Alexander, Willy Lew,
* Lisa Du, Nikita Borisov
* <otr@cypherpunks.ca>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of version 2.1 of the GNU Lesser General
* Public License as published by the Free Software Foundation.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef __CONTEXT_PRIV_H__
#define __CONTEXT_PRIV_H__
#include <gcrypt.h>
#include "dh.h"
#include "auth.h"
#include "sm.h"
typedef struct context_priv {
/* The part of the fragmented message we've seen so far */
char *fragment;
/* The length of fragment */
size_t fragment_len;
/* The total number of fragments in this message */
unsigned short fragment_n;
/* The highest fragment number we've seen so far for this message */
unsigned short fragment_k;
/* current keyid used by other side; this is set to 0 if we get
* a OTRL_TLV_DISCONNECTED message from them. */
unsigned int their_keyid;
/* Y[their_keyid] (their DH pubkey) */
gcry_mpi_t their_y;
/* Y[their_keyid-1] (their prev DH pubkey) */
gcry_mpi_t their_old_y;
/* current keyid used by us */
unsigned int our_keyid;
/* DH key[our_keyid] */
DH_keypair our_dh_key;
/* DH key[our_keyid-1] */
DH_keypair our_old_dh_key;
/* sesskeys[i][j] are the session keys derived from DH
* key[our_keyid-i] and mpi Y[their_keyid-j] */
DH_sesskeys sesskeys[2][2];
/* saved mac keys to be revealed later */
unsigned int numsavedkeys;
unsigned char *saved_mac_keys;
/* generation number: increment every time we go private, and never
* reset to 0 (unless we remove the context entirely) */
unsigned int generation;
/* The last time a Data Message was sent */
time_t lastsent;
/* The last time a Data Message was received */
time_t lastrecv;
/* The plaintext of the last Data Message sent */
char *lastmessage;
/* Is the last message eligible for retransmission? */
int may_retransmit;
} ConnContextPriv;
/* Create a new private connection context. */
ConnContextPriv *otrl_context_priv_new();
/* Frees up memory that was used in otrl_context_priv_new */
void otrl_context_priv_force_finished(ConnContextPriv *context_priv);
#endif
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