[git] GCRYPT - branch, master, updated. libgcrypt-1.6.0-335-gfdfa5bf

[by NIIBE Yutaka]

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      from  2b40a16333fa75f1cee85ab901a5aa9cff845a92 (commit)

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- Log -----------------------------------------------------------------
commit fdfa5bfefdde316688a3c8021bd3528c5273b0f4
Author: NIIBE Yutaka <gniibe at fsij.org>
Date:   Thu Feb 25 12:01:10 2016 +0900

    mpi: Normalize EXPO for mpi_powm.
    
    * mpi/mpi-pow.c (gcry_mpi_powm): Normalize EP.
    
    --
    
    Thanks to Dan Fandrich for the report with a reproducible test case.
    
    GnuPG-bug-id: 2256
    
    Signed-off-by: NIIBE Yutaka <gniibe at fsij.org>

diff --git a/mpi/mpi-pow.c b/mpi/mpi-pow.c
index 0be153f..a780ebd 100644
--- a/mpi/mpi-pow.c
+++ b/mpi/mpi-pow.c
@@ -83,6 +83,7 @@ _gcry_mpi_powm (gcry_mpi_t res,
 
   rp = res->d;
   ep = expo->d;
+  MPN_NORMALIZE(ep, esize);
 
   if (!msize)
     _gcry_divide_by_zero();
@@ -429,6 +430,9 @@ _gcry_mpi_powm (gcry_mpi_t res,
   size = 2 * msize;
   msign = mod->sign;
 
+  ep = expo->d;
+  MPN_NORMALIZE(ep, esize);
+
   if (esize * BITS_PER_MPI_LIMB > 512)
     W = 5;
   else if (esize * BITS_PER_MPI_LIMB > 256)
@@ -445,7 +449,6 @@ _gcry_mpi_powm (gcry_mpi_t res,
   bsec = mpi_is_secure(base);
 
   rp = res->d;
-  ep = expo->d;
 
   if (!msize)
     _gcry_divide_by_zero();

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

Summary of changes:
 mpi/mpi-pow.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)


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