ecc: fix Montgomery curve bugs.

* cipher/ecc.c (check_secret_key): Y1 should not be NULL when check.
(ecc_check_secret_key): Support Montgomery curve.
* mpi/ec.c (_gcry_mpi_ec_curve_point): Fix condition.

1 files changed, 1 insertions, 1 deletions

diff --git a/mpi/ec.c b/mpi/ec.c
index 0b7c7a71..7266f2a6 100644
--- a/mpi/ec.c
+++ b/mpi/ec.c
@@ -1470,7 +1470,7 @@ _gcry_mpi_ec_curve_point (gcry_mpi_point_t point, mpi_ec_t ctx)
         mpi_rshift (p_minus1, p_minus1, 1);
         ec_powm (w, w, p_minus1, ctx);
 
-        res = mpi_cmp_ui (w, 1);
+        res = !mpi_cmp_ui (w, 1);
 #undef p_minus1
       }
       break;