start with brandt.c

1 files changed, 81 insertions, 1 deletions

diff --git a/brandt.c b/brandt.c
index c5d5a61..d56a607 100644
--- a/brandt.c
+++ b/brandt.c
@@ -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);
+}