Implement coordinate blinding for EC_POINT

[thirdparty/openssl.git] / crypto / ec / ec_lib.c

diff --git a/crypto/ec/ec_lib.c b/crypto/ec/ec_lib.c
index 30b11f75e99821380e45c0b229f1a5e400633251..d0393e8badf2c5790dea69f13e23e2ae029b670a 100644 (file)
--- a/crypto/ec/ec_lib.c
+++ b/crypto/ec/ec_lib.c
@@ -1025,3 +1025,21 @@ int EC_GROUP_do_inverse_ord(const EC_GROUP *group, BIGNUM *res,
     else
         return 0;
 }
+
+/*-
+ * Coordinate blinding for EC_POINT.
+ *
+ * The underlying EC_METHOD can optionally implement this function:
+ * underlying implementations should return 0 on errors, or 1 on
+ * success.
+ *
+ * This wrapper returns 1 in case the underlying EC_METHOD does not
+ * support coordinate blinding.
+ */
+int ec_point_blind_coordinates(const EC_GROUP *group, EC_POINT *p, BN_CTX *ctx)
+{
+    if (group->meth->blind_coordinates == NULL)
+        return 1; /* ignore if not implemented */
+
+    return group->meth->blind_coordinates(group, p, ctx);
+}