124 lines
3.7 KiB
C
124 lines
3.7 KiB
C
/* This file is part of libbrandt.
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* Copyright (C) 2016 GNUnet e.V.
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*
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* libbrandt is free software: you can redistribute it and/or modify it under
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* the terms of the GNU General Public License as published by the Free Software
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* Foundation, either version 3 of the License, or (at your option) any later
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* version.
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*
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* libbrandt is distributed in the hope that it will be useful, but WITHOUT ANY
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* WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
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* A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* libbrandt. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* @file brandt.c
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* @brief Implementation of the high level libbrandt interface.
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* @author Markus Teich
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*/
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#include "brandt_config.h"
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#include "crypto.h"
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#include "internals.h"
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#include "util.h"
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void
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BRANDT_init (struct GNUNET_CRYPTO_EccDlogContext *dlogctx)
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{
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gcry_error_t err = 0;
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if (!gcry_check_version ("1.7.0"))
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eprintf ("libgcrypt version mismatch");
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/* SECMEM cannot be resized dynamically. We do not know how much we need */
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if ((err = gcry_control (GCRYCTL_DISABLE_SECMEM, 0)))
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weprintf ("failed to set libgcrypt option DISABLE_SECMEM: %s",
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gcry_strerror (err));
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/* ecc is slow otherwise and we don't create long term keys anyway. */
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if ((err = gcry_control (GCRYCTL_ENABLE_QUICK_RANDOM, 0)))
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weprintf ("failed to set libgcrypt option ENABLE_QUICK_RANDOM: %s",
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gcry_strerror (err));
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gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
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brandt_crypto_init (dlogctx);
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}
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static void
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advance_round (struct BRANDT_Auction *auction, enum auction_type atype, enum outcome_type outcome)
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{
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unsigned char *buf;
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size_t buflen;
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/* if we got the current round message from all participants, advance to
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* next round */
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for (uint16_t i = 0; i < auction->n; i++)
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if (!gcry_mpi_test_bit (auction->round_progress, i))
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return;
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gcry_mpi_clear_highbit (auction->round_progress, 0);
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if (msg_last == ++(auction->cur_round))
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{
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}
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if (!handler_out[atype][outcome][auction->cur_round] ||
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!(buf = handler_out[atype][outcome][auction->cur_round](auction, &buflen)))
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{
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/** \todo */
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weprintf ("wow fail out");
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return;
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}
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/** \todo: add msgtype header in the handler_out functions */
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/* last message only sent to seller, others are broadcasted */
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if (msg_decrypt == auction->cur_round)
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auction->ucast (auction->closure, buf, buflen);
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else
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auction->bcast (auction->closure, buf, buflen);
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}
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void
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BRANDT_got_message (struct BRANDT_Auction *auction,
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uint16_t sender,
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const unsigned char *msg,
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size_t msg_len)
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{
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uint16_t mtype = *(uint16_t *)msg;
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enum auction_type atype;
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enum outcome_type outcome;
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enum rounds round = auction->cur_round;
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atype = auction->desc->m > 0 ? auction_mPlusFirstPrice : auction_firstPrice;
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outcome = auction->desc->outcome_public ? outcome_public : outcome_private;
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/** \todo: cache out of order messages */
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/* check if we already got that round message from the same user */
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if (gcry_mpi_test_bit (auction->round_progress, sender))
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{
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weprintf ("got a duplicate message from user %d", sender);
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return;
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}
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if (!handler_in[atype][outcome][round] ||
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!handler_in[atype][outcome][round](auction,
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msg + sizeof (mtype),
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msg_len - sizeof (mtype),
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sender))
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{
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/** \todo */
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weprintf ("wow fail in");
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return;
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}
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gcry_mpi_set_bit (auction->round_progress, sender);
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advance_round (auction, atype, outcome);
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}
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