From 23ecadf309f8056c35cc092e58df801ac0eab862 Mon Sep 17 00:00:00 2001
From: Markus Teich <markus.teich@stusta.mhn.de>
Date: Tue, 7 Oct 2014 18:24:27 +0200
Subject: mpi: Add gcry_mpi_ec_sub.

* NEWS (gcry_mpi_ec_sub): New.
* doc/gcrypt.texi (gcry_mpi_ec_sub): New.
* mpi/ec.c (_gcry_mpi_ec_sub, sub_points_edwards): New.
(sub_points_montgomery, sub_points_weierstrass): New stubs.
* src/gcrypt-int.h (_gcry_mpi_ec_sub): New.
* src/gcrypt.h.in (gcry_mpi_ec_sub): New.
* src/libgcrypt.def (gcry_mpi_ec_sub): New.
* src/libgcrypt.vers (gcry_mpi_ec_sub): New.
* src/mpi.h (_gcry_mpi_ec_sub_points): New.
* src/visibility.c (gcry_mpi_ec_sub): New.
* src/visibility.h (gcry_mpi_ec_sub): New.
--

This function subtracts two points on the curve. Only Twisted Edwards
curves are supported with this change.

Signed-off-by: Markus Teich <markus dot teich at stusta dot mhn dot de>
---
 mpi/ec.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 65 insertions(+)

(limited to 'mpi/ec.c')

diff --git a/mpi/ec.c b/mpi/ec.c
index a55291a9..80f3b220 100644
--- a/mpi/ec.c
+++ b/mpi/ec.c
@@ -1131,6 +1131,71 @@ _gcry_mpi_ec_add_points (mpi_point_t result,
 }
 
 
+/* RESULT = P1 - P2  (Weierstrass version).*/
+static void
+sub_points_weierstrass (mpi_point_t result,
+                        mpi_point_t p1, mpi_point_t p2,
+                        mpi_ec_t ctx)
+{
+  (void)result;
+  (void)p1;
+  (void)p2;
+  (void)ctx;
+  log_fatal ("%s: %s not yet supported\n",
+             "_gcry_mpi_ec_sub_points", "Weierstrass");
+}
+
+
+/* RESULT = P1 - P2  (Montgomery version).*/
+static void
+sub_points_montgomery (mpi_point_t result,
+                       mpi_point_t p1, mpi_point_t p2,
+                       mpi_ec_t ctx)
+{
+  (void)result;
+  (void)p1;
+  (void)p2;
+  (void)ctx;
+  log_fatal ("%s: %s not yet supported\n",
+             "_gcry_mpi_ec_sub_points", "Montgomery");
+}
+
+
+/* RESULT = P1 - P2  (Twisted Edwards version).*/
+static void
+sub_points_edwards (mpi_point_t result,
+                    mpi_point_t p1, mpi_point_t p2,
+                    mpi_ec_t ctx)
+{
+  mpi_point_t p2i = _gcry_mpi_point_new (0);
+  point_set (p2i, p2);
+  _gcry_mpi_neg (p2i->x, p2i->x);
+  add_points_edwards (result, p1, p2i, ctx);
+  _gcry_mpi_point_release (p2i);
+}
+
+
+/* RESULT = P1 - P2 */
+void
+_gcry_mpi_ec_sub_points (mpi_point_t result,
+                         mpi_point_t p1, mpi_point_t p2,
+                         mpi_ec_t ctx)
+{
+  switch (ctx->model)
+    {
+    case MPI_EC_WEIERSTRASS:
+      sub_points_weierstrass (result, p1, p2, ctx);
+      break;
+    case MPI_EC_MONTGOMERY:
+      sub_points_montgomery (result, p1, p2, ctx);
+      break;
+    case MPI_EC_EDWARDS:
+      sub_points_edwards (result, p1, p2, ctx);
+      break;
+    }
+}
+
+
 /* Scalar point multiplication - the main function for ECC.  If takes
    an integer SCALAR and a POINT as well as the usual context CTX.
    RESULT will be set to the resulting point. */
-- 
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