From 5179e463d5c7d3e542eb3797ddaf9cbfe176784a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Manuel=20P=C3=A9gouri=C3=A9-Gonnard?= <mpg@elzevir.fr>
Date: Wed, 31 Oct 2012 19:37:54 +0100
Subject: [PATCH] Allowed point at infinity, supressed ecp_double()

---
 include/polarssl/ecp.h | 21 +++++----------------
 library/ecp.c          |  3 +++
 2 files changed, 8 insertions(+), 16 deletions(-)

diff --git a/include/polarssl/ecp.h b/include/polarssl/ecp.h
index d9e6ed635..e76cd9eb0 100644
--- a/include/polarssl/ecp.h
+++ b/include/polarssl/ecp.h
@@ -38,8 +38,9 @@
  */
 typedef struct
 {
-    mpi X;      /*!<  the point's X coordinate  */
-    mpi Y;      /*!<  the point's Y coordinate  */
+    char is_zero;   /*!<  true if point at infinity */
+    mpi X;          /*!<  the point's X coordinate  */
+    mpi Y;          /*!<  the point's Y coordinate  */
 }
 ecp_point;
 
@@ -156,18 +157,6 @@ extern "C" {
 int ecp_add( const ecp_group *grp, ecp_point *R,
              const ecp_point *P, const ecp_point *Q );
 
-/**
- * \brief           Duplication: R = 2 P
- *
- * \param grp       ECP group
- * \param R         Destination point
- * \param P         Point to double
- *
- * \return          0 if successful, or an POLARSSL_ERR_ECP_XXX error code
- */
-int ecp_double( const ecp_group *grp, ecp_point *R,
-                const ecp_point *P );
-
 /**
  * \brief           Multiplication by an integer: R = m * P
  *
@@ -178,8 +167,8 @@ int ecp_double( const ecp_group *grp, ecp_point *R,
  *
  * \return          0 if successful, or an POLARSSL_ERR_ECP_XXX error code
  */
-int ecp_multiply( const ecp_group *grp, ecp_point *R,
-                  const mpi *m, const ecp_point *P );
+int ecp_mul( const ecp_group *grp, ecp_point *R,
+             const mpi *m, const ecp_point *P );
 
 /**
  * \brief           Free the components of a point
diff --git a/library/ecp.c b/library/ecp.c
index 7f157377f..2173e2484 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -44,6 +44,7 @@ void ecp_point_free( ecp_point *pt )
     if( pt == NULL )
         return;
 
+    pt->is_zero = 1;
     mpi_free( &( pt->X ) );
     mpi_free( &( pt->Y ) );
 }
@@ -62,6 +63,8 @@ void ecp_group_free( ecp_group *grp )
     ecp_point_free( &( grp->G ) );
 }
 
+
+
 #if defined(POLARSSL_SELF_TEST)
 
 /*