[git] GCRYPT - branch, master, updated. libgcrypt-1.6.0-290-g3658afd

[by NIIBE Yutaka]

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      from  88e1358962e902ff1cbec8d53ba3eee46407851a (commit)

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- Log -----------------------------------------------------------------
commit 3658afd09c3b03b4398aaa5748387220c93b1a94
Author: NIIBE Yutaka <gniibe at fsij.org>
Date:   Thu Nov 26 11:37:47 2015 +0900

    ecc: minor improvement of point multiplication.
    
    * mpi/ec.c (_gcry_mpi_ec_mul_point): Move ec_subm out of the loop.

diff --git a/mpi/ec.c b/mpi/ec.c
index 4d59a7e..40e09be 100644
--- a/mpi/ec.c
+++ b/mpi/ec.c
@@ -1415,6 +1415,10 @@ _gcry_mpi_ec_mul_point (mpi_point_t result,
   point_init (&p2);
   point_init (&p1inv);
 
+  /* Invert point: y = p - y mod p  */
+  point_set (&p1inv, &p1);
+  ec_subm (p1inv.y, ctx->p, p1inv.y, ctx);
+
   for (i=loops-2; i > 0; i--)
     {
       _gcry_mpi_ec_dup_point (result, result, ctx);
@@ -1426,9 +1430,6 @@ _gcry_mpi_ec_mul_point (mpi_point_t result,
       if (mpi_test_bit (h, i) == 0 && mpi_test_bit (k, i) == 1)
         {
           point_set (&p2, result);
-          /* Invert point: y = p - y mod p  */
-          point_set (&p1inv, &p1);
-          ec_subm (p1inv.y, ctx->p, p1inv.y, ctx);
           _gcry_mpi_ec_add_points (result, &p2, &p1inv, ctx);
         }
     }

-----------------------------------------------------------------------

Summary of changes:
 mpi/ec.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)


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