make sure fast invmod lowers result in too big case

2015-09-28 15:56:27 -07:00
parent 27450aca7d
commit ad51d4ba09
2 changed files with 10 additions and 0 deletions
--- a/wolfcrypt/src/integer.c
+++ b/wolfcrypt/src/integer.c
@@ -989,6 +989,12 @@ top:
      goto LBL_ERR;
    }
  }
+  /* too big */
+  while (mp_cmp_mag(&D, b) != MP_LT) {
+      if ((res = mp_sub(&D, b, &D)) != MP_OKAY) {
+         goto LBL_ERR;
+      }
+  }
  mp_exch (&D, c);
  c->sign = neg;
  res = MP_OKAY;