create proof for public key share

1 files changed, 18 insertions, 15 deletions

diff --git a/crypto.c b/crypto.c
index 3619f3c..fa37f5e 100644
--- a/crypto.c
+++ b/crypto.c
@@ -528,26 +528,15 @@ smc_sum (gcry_mpi_point_t out, gcry_mpi_point_t in[], uint16_t len)
 
 
 /**
- * smc_compute_pkey calculates the shared public key
- *
- * @param[in,out] ad The struct AuctionData used
- */
-void
-smc_compute_pkey (struct AuctionData *ad)
-{
-        ad->Y = gcry_mpi_point_new (0);
-        smc_sum (ad->Y, ad->y, ad->n);
-}
-
-
-/**
  * smc_gen_keyshare creates the private additive keyshare and computes the
  * public multiplicative key share
  *
  * @param[in,out] ad Pointer to the AuctionData struct to operate on
+ * @param[out] proof Pointer to where the proof of knowledge should be saved.
+ * Must be allocated memory with apropriate size for one proof struct.
  */
 void
-smc_gen_keyshare (struct AuctionData *ad)
+smc_gen_keyshare (struct AuctionData *ad, struct proof_dl *proof)
 {
         uint16_t i;
 
@@ -556,7 +545,21 @@ smc_gen_keyshare (struct AuctionData *ad)
                 ad->y[0] = gcry_mpi_point_new (0);
 
         ad->x = gcry_mpi_new (0);
-        ec_keypair_create (ad->y[ad->i], ad->x);
+        ec_skey_create (ad->x);
+        smc_zkp_dl (ad->y[ad->i], ad->x, proof);
+}
+
+
+/**
+ * smc_compute_pkey calculates the shared public key
+ *
+ * @param[in,out] ad The struct AuctionData used
+ */
+void
+smc_compute_pkey (struct AuctionData *ad)
+{
+        ad->Y = gcry_mpi_point_new (0);
+        smc_sum (ad->Y, ad->y, ad->n);
 }