[git] GCRYPT - branch, master, updated. libgcrypt-1.7.3-118-g66ed4d5

[by NIIBE Yutaka]

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       via  66ed4d53789892def7b237756d8a0ab28df9d222 (commit)
       via  619ebae9847831f43314a95cc3180f4b329b4d3b (commit)
      from  e235f6a62f6268538c784154c2d1470ff073b6a8 (commit)

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- Log -----------------------------------------------------------------
commit 66ed4d53789892def7b237756d8a0ab28df9d222
Author: NIIBE Yutaka <gniibe at fsij.org>
Date:   Fri Jul 7 12:00:03 2017 +0900

    mpi: Fix mpi_pow alternative implementation.
    
    * mpi/mpi-pow.c
      [USE_ALGORITHM_SIMPLE_EXPONENTIATION] (_gcry_mpi_powm): Use
      mpi_set_cond.
    
    --
    
    Limbs of RES may be allocated more before the call of mpi_pow,
    but it only uses the space of SIZE.
    
    Signed-off-by: NIIBE Yutaka <gniibe at fsij.org>

diff --git a/mpi/mpi-pow.c b/mpi/mpi-pow.c
index 3d6d68c..54f477b 100644
--- a/mpi/mpi-pow.c
+++ b/mpi/mpi-pow.c
@@ -188,10 +188,16 @@ _gcry_mpi_powm (gcry_mpi_t res,
     mpi_limb_t e;
     mpi_limb_t carry_limb;
     struct karatsuba_ctx karactx;
+    struct gcry_mpi w, u;
 
     xp_nlimbs = msec? size:0;
     xp = xp_marker = mpi_alloc_limb_space( size, msec );
 
+    w.sign = u.sign = 0;
+    w.flags = u.flags = 0;
+    w.alloced = w.nlimbs = size; /* RES->alloc may be longer.  */
+    u.alloced = u.nlimbs = size;
+
     memset( &karactx, 0, sizeof karactx );
     negative_result = (ep[0] & 1) && bsign;
 
@@ -267,11 +273,11 @@ _gcry_mpi_powm (gcry_mpi_t res,
                     xsize = msize;
                   }
               }
-            if ( (mpi_limb_signed_t)e < 0 )
-              {
-                tp = rp; rp = xp; xp = tp;
-                rsize = xsize;
-              }
+
+            w.d = rp;
+            u.d = xp;
+            mpi_set_cond (&w, &u, ((mpi_limb_signed_t)e < 0));
+
             e <<= 1;
             c--;
           }

commit 619ebae9847831f43314a95cc3180f4b329b4d3b
Author: NIIBE Yutaka <gniibe at fsij.org>
Date:   Fri Jul 7 11:39:09 2017 +0900

    Fix mpi_pow alternative implementation.
    
    * mpi/mpi-pow.c [USE_ALGORITHM_SIMPLE_EXPONENTIATION] (_gcry_mpi_powm):
    Allocate size fix.
    
    Signed-off-by: NIIBE Yutaka <gniibe at fsij.org>

diff --git a/mpi/mpi-pow.c b/mpi/mpi-pow.c
index 3cba690..3d6d68c 100644
--- a/mpi/mpi-pow.c
+++ b/mpi/mpi-pow.c
@@ -189,8 +189,8 @@ _gcry_mpi_powm (gcry_mpi_t res,
     mpi_limb_t carry_limb;
     struct karatsuba_ctx karactx;
 
-    xp_nlimbs = msec? (2 * (msize + 1)):0;
-    xp = xp_marker = mpi_alloc_limb_space( 2 * (msize + 1), msec );
+    xp_nlimbs = msec? size:0;
+    xp = xp_marker = mpi_alloc_limb_space( size, msec );
 
     memset( &karactx, 0, sizeof karactx );
     negative_result = (ep[0] & 1) && bsign;

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

Summary of changes:
 mpi/mpi-pow.c | 20 +++++++++++++-------
 1 file changed, 13 insertions(+), 7 deletions(-)


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