Make sure EC_window_bits_for_scalar_size() returns a size_t

diff --git a/crypto/ec/ec_mult.c b/crypto/ec/ec_mult.c
index 4dbc93112062cf2577350121fc805283ace6743b..16822a73cf51735909d8d39409a7df883ab1d1a6 100644 (file)
--- a/crypto/ec/ec_mult.c
+++ b/crypto/ec/ec_mult.c
@@ -175,12 +175,13 @@ static signed char *compute_wNAF(const BIGNUM *scalar, int w, size_t *ret_len, B
  *       (thus the boundaries should be increased)
  */
 #define EC_window_bits_for_scalar_size(b) \
-               ((b) >= 2000 ? 6 : \
-                (b) >=  800 ? 5 : \
-                (b) >=  300 ? 4 : \
-                (b) >=   70 ? 3 : \
-                (b) >=   20 ? 2 : \
-                 1)
+               ((size_t) \
+                ((b) >= 2000 ? 6 : \
+                 (b) >=  800 ? 5 : \
+                 (b) >=  300 ? 4 : \
+                 (b) >=   70 ? 3 : \
+                 (b) >=   20 ? 2 : \
+                  1))
 
 /* Compute
  *      \sum scalars[i]*points[i],