Added ecp_copy() (for points)
diff --git a/include/polarssl/ecp.h b/include/polarssl/ecp.h
index e76cd9e..23d3fbd 100644
--- a/include/polarssl/ecp.h
+++ b/include/polarssl/ecp.h
@@ -33,6 +33,7 @@
* ECP Error codes
*/
+
/**
* \brief ECP point structure (affine coordinates)
*/
@@ -145,6 +146,26 @@
#endif
/**
+ * \brief Free the components of a point
+ */
+void ecp_point_free( ecp_point *pt );
+
+/**
+ * \brief Free the components of an ECP group
+ */
+void ecp_group_free( ecp_group *grp );
+
+/**
+ * \brief Copy the contents of point Q into P
+ *
+ * \param P Destination point
+ * \param Q Source point
+ *
+ * \return 0 if successful, or an POLARSSL_ERR_ECP_XXX error code
+ */
+int ecp_copy( ecp_point *P, const ecp_point *Q );
+
+/**
* \brief Addition: R = P + Q
*
* \param grp ECP group
@@ -171,16 +192,6 @@
const mpi *m, const ecp_point *P );
/**
- * \brief Free the components of a point
- */
-void ecp_point_free( ecp_point *pt );
-
-/**
- * \brief Free the components of an ECP group
- */
-void ecp_group_free( ecp_group *grp );
-
-/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
diff --git a/library/ecp.c b/library/ecp.c
index 2173e24..6c3b4a8 100644
--- a/library/ecp.c
+++ b/library/ecp.c
@@ -26,7 +26,7 @@
/*
* References:
*
- * SEC1-v2 (XXX: insert url)
+ * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
* Guide to Elliptic Curve Cryptography - Hankerson, Menezes, Vanstone
*/
@@ -57,12 +57,26 @@
if( grp == NULL )
return;
- mpi_free( &( grp->P ) );
- mpi_free( &( grp->B ) );
- mpi_free( &( grp->N ) );
- ecp_point_free( &( grp->G ) );
+ mpi_free( &grp->P );
+ mpi_free( &grp->B );
+ ecp_point_free( &grp->G );
+ mpi_free( &grp->N );
}
+/*
+ * Copy the contents of Q into P
+ */
+int ecp_copy( ecp_point *P, const ecp_point *Q )
+{
+ int ret;
+
+ P->is_zero = Q->is_zero;
+ MPI_CHK( mpi_copy( &P->X, &Q->X ) );
+ MPI_CHK( mpi_copy( &P->Y, &Q->Y ) );
+
+cleanup:
+ return( ret );
+}
#if defined(POLARSSL_SELF_TEST)