commit fix for #67 from libtommath repo

thanks to @karel-m for the fix!
libtom · Mar 10, 2017 · 8ae5ddf · 8ae5ddf
1 parent b8527e9
commit 8ae5ddf
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/bn_mp_invmod.c b/bn_mp_invmod.c
@@ -24,8 +24,8 @@ int mp_invmod (mp_int * a, mp_int * b, mp_int * c)
   }
 
 #ifdef BN_FAST_MP_INVMOD_C
-  /* if the modulus is odd we can use a faster routine instead */
-  if (mp_isodd (b) == MP_YES) {
+  /* if the modulus is odd (but not 1) we can use a faster routine instead */
+  if ((mp_isodd (b) == MP_YES) && (mp_cmp_d (b, 1) != MP_EQ)) {
     return fast_mp_invmod (a, b, c);
   }
 #endif