start with brandt.c

1 files changed, 65 insertions, 16 deletions

diff --git a/internals.h b/internals.h
index 1e6eb18..7dab0d6 100644
--- a/internals.h
+++ b/internals.h
@@ -25,22 +25,71 @@
 
 #include <gcrypt.h>
 
-struct AuctionData {
-	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 */
-	uint16_t b;                /** Own bid */
-
-	gcry_mpi_t       x;        /** Own private additive key share */
-	gcry_mpi_point_t *y;       /** public multiplicative key shares, size: n */
-	gcry_mpi_point_t Y;        /** Shared public key */
-
-	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 */
+#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 */
+	uint16_t b;                 /** Own bid */
+
+	gcry_mpi_t       x;         /** Own private additive key share */
+	gcry_mpi_point_t *y;        /** public multiplicative key shares, size: n */
+	gcry_mpi_point_t Y;         /** Shared public key */
+
+	gcry_mpi_point_t **alpha;   /** alphas, size: n*k */
+	gcry_mpi_point_t **beta;    /** betas, size: 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 */