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/* This file is part of libbrandt.
* Copyright (C) 2016 GNUnet e.V.
*
* libbrandt 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 3 of the License, or (at your option) any later
* version.
*
* libbrandt 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.
*
* You should have received a copy of the GNU General Public License along with
* libbrandt. If not, see <http://www.gnu.org/licenses/>.
*/
/**
* @file brandt.c
* @brief Implementation of the high level libbrandt interface.
* @author Markus Teich
*/
#include "brandt_config.h"
#include "crypto.h"
#include "internals.h"
#include "util.h"
void
BRANDT_init (struct GNUNET_CRYPTO_EccDlogContext *dlogctx)
{
gcry_error_t err = 0;
if (!gcry_check_version ("1.7.0"))
eprintf ("libgcrypt version mismatch");
/* SECMEM cannot be resized dynamically. We do not know how much we need */
if ((err = gcry_control (GCRYCTL_DISABLE_SECMEM, 0)))
weprintf ("failed to set libgcrypt option DISABLE_SECMEM: %s",
gcry_strerror (err));
/* ecc is slow otherwise and we don't create long term keys anyway. */
if ((err = gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0)))
weprintf ("failed to set libgcrypt option ENABLE_QUICK_RANDOM: %s",
gcry_strerror (err));
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
brandt_crypto_init (dlogctx);
}
static void
advance_round (struct BRANDT_Auction *auction, enum auction_type atype, enum outcome_type outcome)
{
unsigned char *buf;
size_t buflen;
/* if we got the current round message from all participants, advance to
* next round */
for (uint16_t i = 0; i < auction->n; i++)
if (!gcry_mpi_test_bit (auction->round_progress, i))
return;
gcry_mpi_clear_highbit (auction->round_progress, 0);
if (msg_last == ++(auction->cur_round))
{
}
if (!handler_out[atype][outcome][auction->cur_round] ||
!(buf = handler_out[atype][outcome][auction->cur_round](auction, &buflen)))
{
/** \todo */
weprintf ("wow fail out");
return;
}
/** \todo: add msgtype header in the handler_out functions */
/* last message only sent to seller, others are broadcasted */
if (msg_decrypt == auction->cur_round)
auction->ucast (auction->closure, buf, buflen);
else
auction->bcast (auction->closure, buf, buflen);
}
void
BRANDT_got_message (struct BRANDT_Auction *auction,
uint16_t sender,
const unsigned char *msg,
size_t msg_len)
{
uint16_t mtype = *(uint16_t *)msg;
enum auction_type atype;
enum outcome_type outcome;
enum rounds round = auction->cur_round;
atype = auction->desc->m > 0 ? auction_mPlusFirstPrice : auction_firstPrice;
outcome = auction->desc->outcome_public ? outcome_public : outcome_private;
/** \todo: cache out of order messages */
/* check if we already got that round message from the same user */
if (gcry_mpi_test_bit (auction->round_progress, sender))
{
weprintf ("got a duplicate message from user %d", sender);
return;
}
if (!handler_in[atype][outcome][round] ||
!handler_in[atype][outcome][round](auction,
msg + sizeof (mtype),
msg_len - sizeof (mtype),
sender))
{
/** \todo */
weprintf ("wow fail in");
return;
}
gcry_mpi_set_bit (auction->round_progress, sender);
advance_round (auction, atype, outcome);
}
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