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start with brandt.c

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This commit is contained in:
Markus Teich 2016-07-06 14:56:14 +02:00
parent 39ff8cfaa4
commit 4deee5eb12
3 changed files with 186 additions and 72 deletions
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82
brandt.c
View File

@ -22,8 +22,62 @@
#include <gcrypt.h>
#include "crypto.h"
#include "internals.h"
#include "util.h"
typedef int
(*msg_recv)(struct BRANDT_Auction *ad,
const unsigned char *buf,
size_t buflen,
uint16_t sender);
/**
* stores the function pointers to receive functions for each state.
*
* The first index denotes if a first price auction or a M+1st price auction is
* used. If it is 0, it is a first price auction, if it is 1, it is a M+1st
* price auction.
*
* The second index denotes if the outcome should be public or private. A value
* of 0 means a private outcome, while a value of 1 means public outcome.
*/
static msg_recv handler_in[2][2][msg_last] =
{
[0] =
{
[0] =
{
[msg_init] = smc_recv_keyshare,
[msg_bid] = smc_recv_encrypted_bid,
[msg_outcome] = fp_priv_recv_outcome,
[msg_decrypt] = fp_priv_recv_decryption,
},
[1] =
{
[msg_init] = smc_recv_keyshare,
[msg_bid] = smc_recv_encrypted_bid,
[msg_outcome] = fp_pub_recv_outcome,
[msg_decrypt] = fp_pub_recv_decryption,
}
},
[1] =
{
[0] =
{
[msg_init] = smc_recv_keyshare,
[msg_bid] = smc_recv_encrypted_bid,
},
[1] =
{
[msg_init] = smc_recv_keyshare,
[msg_bid] = smc_recv_encrypted_bid,
}
}
};
void
BRANDT_init ()
{
@ -37,7 +91,7 @@ BRANDT_init ()
weprintf ("failed to set libgcrypt option DISABLE_SECMEM: %s",
gcry_strerror (err));
/* ecc is slow otherwise. */
/* 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));
@ -45,3 +99,29 @@ BRANDT_init ()
gcry_control (GCRYCTL_INITIALIZATION_FINISHED, 0);
brandt_crypto_init ();
}
void
BRANDT_got_message (struct BRANDT_Auction *auction,
uint16_t sender,
const unsigned char *msg,
size_t msg_len)
{
uint16_t type = *(uint16_t *)msg;
int m = !!auction->desc->m;
int pub = !!auction->desc->outcome_public;
enum rounds round = auction->cur_round;
/** todo: cache out of order messages */
if (!handler_in[m][pub][round] ||
!handler_in[m][pub][round](auction,
msg + sizeof (type),
msg_len - sizeof (type),
sender))
{
/** \todo */
weprintf ("wow fail");
}
msg + sizeof (type);
}

77
brandt.h
View File

@ -23,19 +23,16 @@
#ifndef _BRANDT_BRANDT_H
#define _BRANDT_BRANDT_H
#include <unistd.h>
#include <stdint.h>
#include <unistd.h>
/**
* \todo.
*/
/** defined in internals.h */
struct BRANDT_Auction;
/**
* Functions of this type are called by libbrandt to broadcast messages to the
* blackboard of a specific auction.
*
* \todo: how must the message be handled? (encryption, auth, reliability, …)
* blackboard of a specific auction. They have to be sent using authenticated
* encryption.
*
* @param[in] auction_closure Closure pointer representing the respective
* auction. This is the Pointer given to BRANDT_join().
@ -45,16 +42,15 @@ struct BRANDT_Auction;
* @return 0 on success, -1 on failure.
*/
typedef int
(*BRANDT_BroadcastCallback)(void * auction_closure,
(*BRANDT_CbBroadcast)(void *auction_closure,
const void *msg,
size_t msg_len);
/**
* Functions of this type are called by libbrandt to unicast messages to the
* seller of a specific auction.
*
* \todo: how must the message be handled? (encryption, auth, reliability, …)
* seller of a specific auction. They have to be sent using authenticated
* encryption.
*
* @param[in] auction_closure Closure pointer representing the respective
* auction. This is the Pointer given to BRANDT_join().
@ -63,7 +59,7 @@ typedef int
* @return 0 on success, -1 on failure.
*/
typedef int
(*BRANDT_UnicastSellerCallback)(void * auction_closure,
(*BRANDT_CbUnicast)(void *auction_closure,
const void *msg,
size_t msg_len);
@ -72,7 +68,6 @@ typedef int
* Functions of this type are called by libbrandt to report the auction outcome
* or malicious/erroneous participants.
*
* \todo: update price type.
* \todo: export proof of erroneous behaviour.
*
* @param[in] auction_closure Closure pointer representing the respective
@ -84,7 +79,7 @@ typedef int
* is private and the user did not win.
*/
typedef void
(*BRANDT_ReportResultCallback)(void * auction_closure,
(*BRANDT_CbResult)(void *auction_closure,
unsigned int bidder_id,
int status,
uint16_t price);
@ -98,7 +93,7 @@ BRANDT_init ();
*
* @param[in] broadcast Pointer to the broadcast callback function
* @param[in] unicast Pointer to the unicast callback function
* @param[in] report Pointer to the report callback function
* @param[in] result Pointer to the result callback function
* @param[in] auction_closure Closure pointer representing the auction. This
* will not be touched by libbrandt. It is only passed to the callbacks.
* @param[in] auction_data The auction information data a an opaque data
@ -110,11 +105,11 @@ BRANDT_init ();
* black-box pointer, do NOT access/change it or the data it points to!
*/
struct BRANDT_Auction *
BRANDT_join (BRANDT_BroadcastCallback broadcast,
BRANDT_UnicastSellerCallback unicast,
BRANDT_ReportResultCallback report,
const void * auction_closure,
const void * auction_data,
BRANDT_join (BRANDT_CbBroadcast broadcast,
BRANDT_CbUnicast unicast,
BRANDT_CbResult result,
const void *auction_closure,
const void *auction_data,
size_t auction_data_len);
/* \todo: where do I specify my bid? */
@ -132,7 +127,7 @@ BRANDT_join (BRANDT_BroadcastCallback broadcast,
* Create a new auction described by the @a auction_data parameter.
*
* @param[in] broadcast Pointer to the broadcast callback function
* @param[in] report Pointer to the report callback function
* @param[in] result Pointer to the result callback function
* @param[in] auction_closure Closure pointer representing the auction. This
* will not be touched by libbrandt. It is only passed to the callbacks.
* @param[out] auction_data The auction information data a an opaque data
@ -155,44 +150,34 @@ BRANDT_join (BRANDT_BroadcastCallback broadcast,
* black-box pointer, do NOT access/change it or the data it points to!
*/
struct BRANDT_Auction *
BRANDT_new (BRANDT_BroadcastCallback broadcast,
BRANDT_ReportResultCallback report,
const void * auction_closure,
const void ** auction_data,
size_t * auction_data_len,
BRANDT_new (BRANDT_CbBroadcast broadcast,
BRANDT_CbResult result,
void *auction_closure,
void **auction_data,
size_t *auction_data_len,
uint16_t num_prices,
uint16_t m,
int outcome_public);
/** \todo */
void
BRANDT_free ();
/**
* Receive a broadcast message related to a specific auction.
* Receive a message related to a specific auction.
*
* @param[in] auction The pointer returned by BRANDT_join() or BRANDT_new() from
* which message @a msg was received.
* @param[in] sender The id of the sender.
* @param[in] msg The message that was received.
* @param[in] msg_len The length in bytes of @a msg.
*/
void
BRANDT_got_broadcast (struct BRANDT_Auction *auction,
void * msg,
size_t msg_len);
/**
* Receive a unicast message from a bidder related to a specific auction.
*
* @param[in] auction The pointer returned by BRANDT_new() from which message
* @a msg was received.
* @param[in] msg The message that was received.
* @param[in] msg_len The length in bytes of @a msg.
* \todo: how to link message to sender id within auction?
* ANSWER: on start, know that we have 'n' participants, here give
* participant number (1..n)
*/
void
BRANDT_got_unicast (struct BRANDT_Auction *auction,
void * msg,
BRANDT_got_message (struct BRANDT_Auction *auction,
uint16_t sender,
const unsigned char *msg,
size_t msg_len);

57
internals.h
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@ -25,7 +25,50 @@
#include <gcrypt.h>
struct AuctionData {
#include "brandt.h"
enum rounds {
msg_init,
msg_bid,
msg_outcome,
msg_decrypt,
msg_last
};
/**
* This struct describes an auction and has to be followed by #description_len
* bytes of arbitrary data where the description of the item to be sold is
* stored. */
struct AuctionDescr {
/** The length of the description in bytes directly following this struct */
uint32_t description_len;
/** Auction type. 0 means first price Auction, >= 0 means M+1st price
* auction with an amount of m items being sold. */
uint16_t m;
/** Outcome type. 0 means private outcome, everything else means public
* outcome. */
uint16_t outcome_public;
/** The amount of possible prices */
uint16_t price_range;
};
struct BRANDT_Auction {
struct AuctionDescr *desc; /** pointer to the auction information */
BRANDT_CbBroadcast bcast; /** broadcast callback */
BRANDT_CbUnicast ucast; /** unicast callback */
BRANDT_CbResult result; /** result reporting callback */
int seller_mode; /** If 0 we are bidding, selling otherwise */
enum rounds cur_round; /** The round we expect messages from */
gcry_mpi_t round_progress; /** Stores which round messages were received */
uint16_t n; /** The amount of bidders/agents */
uint16_t k; /** The amount of possible prices */
uint16_t i; /** Own agents index, only used when bidding */
@ -38,9 +81,15 @@ struct AuctionData {
gcry_mpi_point_t **alpha; /** alphas, size: n*k */
gcry_mpi_point_t **beta; /** betas, size: n*k */
gcry_mpi_point_t ***gamma; /** gamma, size: n*n*k */
gcry_mpi_point_t ***delta; /** delta, size: n*n*k */
gcry_mpi_point_t ***phi; /** phi, size: n*n*k */
gcry_mpi_point_t **gamma2; /** gamma2, for public outcome, size: n*k */
gcry_mpi_point_t ***gamma3; /** gamma3, for private outcome, size: n*n*k */
gcry_mpi_point_t **delta2; /** delta2, for public outcome, size: n*k */
gcry_mpi_point_t ***delta3; /** delta3, for private outcome, size: n*n*k */
gcry_mpi_point_t **phi2; /** phi2, for public outcome, size: n*k */
gcry_mpi_point_t ***phi3; /** phi3, for private outcome, size: n*n*k */
gcry_mpi_point_t *tmpa1; /** used for temporary storage, size: k */
gcry_mpi_point_t *tmpb1; /** used for temporary storage, size: k */
};
#endif /* ifndef _BRANDT_INTERNALS_H */