--- a/libtommath/bn_mp_div_2d.c	Tue May 26 23:27:26 2020 +0800
+++ b/libtommath/bn_mp_div_2d.c	Tue May 26 17:36:47 2020 +0200
@@ -1,52 +1,44 @@
 #include "tommath_private.h"
 #ifdef BN_MP_DIV_2D_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.
- *
- * SPDX-License-Identifier: Unlicense
- */
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
 
 /* shift right by a certain bit count (store quotient in c, optional remainder in d) */
-int mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d)
+mp_err mp_div_2d(const mp_int *a, int b, mp_int *c, mp_int *d)
 {
    mp_digit D, r, rr;
-   int     x, res;
+   int     x;
+   mp_err err;
 
    /* if the shift count is <= 0 then we do no work */
    if (b <= 0) {
-      res = mp_copy(a, c);
+      err = mp_copy(a, c);
       if (d != NULL) {
          mp_zero(d);
       }
-      return res;
+      return err;
    }
 
    /* copy */
-   if ((res = mp_copy(a, c)) != MP_OKAY) {
-      return res;
+   if ((err = mp_copy(a, c)) != MP_OKAY) {
+      return err;
    }
    /* 'a' should not be used after here - it might be the same as d */
 
    /* get the remainder */
    if (d != NULL) {
-      if ((res = mp_mod_2d(a, b, d)) != MP_OKAY) {
-         return res;
+      if ((err = mp_mod_2d(a, b, d)) != MP_OKAY) {
+         return err;
       }
    }
 
    /* shift by as many digits in the bit count */
-   if (b >= DIGIT_BIT) {
-      mp_rshd(c, b / DIGIT_BIT);
+   if (b >= MP_DIGIT_BIT) {
+      mp_rshd(c, b / MP_DIGIT_BIT);
    }
 
-   /* shift any bit count < DIGIT_BIT */
-   D = (mp_digit)(b % DIGIT_BIT);
+   /* shift any bit count < MP_DIGIT_BIT */
+   D = (mp_digit)(b % MP_DIGIT_BIT);
    if (D != 0u) {
       mp_digit *tmpc, mask, shift;
 
@@ -54,7 +46,7 @@
       mask = ((mp_digit)1 << D) - 1uL;
 
       /* shift for lsb */
-      shift = (mp_digit)DIGIT_BIT - D;
+      shift = (mp_digit)MP_DIGIT_BIT - D;
 
       /* alias */
       tmpc = c->dp + (c->used - 1);
@@ -77,7 +69,3 @@
    return MP_OKAY;
 }
 #endif
-
-/* ref:         HEAD -> master, tag: v1.1.0 */
-/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
-/* commit time: 2019-01-28 20:32:32 +0100 */