--- a/libtommath/bn_mp_dr_is_modulus.c	Wed Feb 28 22:11:39 2018 +0800
+++ b/libtommath/bn_mp_dr_is_modulus.c	Thu Oct 15 19:55:15 2020 +0800
@@ -1,43 +1,27 @@
-#include <tommath_private.h>
+#include "tommath_private.h"
 #ifdef BN_MP_DR_IS_MODULUS_C
-/* LibTomMath, multiple-precision integer library -- Tom St Denis
- *
- * LibTomMath is a library that provides multiple-precision
- * integer arithmetic as well as number theoretic functionality.
- *
- * The library was designed directly after the MPI library by
- * Michael Fromberger but has been written from scratch with
- * additional optimizations in place.
- *
- * The library is free for all purposes without any express
- * guarantee it works.
- *
- * Tom St Denis, [email protected], http://libtom.org
- */
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
 
 /* determines if a number is a valid DR modulus */
-int mp_dr_is_modulus(mp_int *a)
+mp_bool mp_dr_is_modulus(const mp_int *a)
 {
    int ix;
 
    /* must be at least two digits */
    if (a->used < 2) {
-      return 0;
+      return MP_NO;
    }
 
    /* must be of the form b**k - a [a <= b] so all
     * but the first digit must be equal to -1 (mod b).
     */
    for (ix = 1; ix < a->used; ix++) {
-       if (a->dp[ix] != MP_MASK) {
-          return 0;
-       }
+      if (a->dp[ix] != MP_MASK) {
+         return MP_NO;
+      }
    }
-   return 1;
+   return MP_YES;
 }
 
 #endif
-
-/* ref:         $Format:%D$ */
-/* git commit:  $Format:%H$ */
-/* commit time: $Format:%ai$ */