-#include <tommath.h>
+#include "tommath_private.h"
#ifdef BN_MP_2EXPT_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, tomstdenis@gmail.com, http://libtom.org
- */
+/* LibTomMath, multiple-precision integer library -- Tom St Denis */
+/* SPDX-License-Identifier: Unlicense */
/* computes a = 2**b
*
* Simple algorithm which zeroes the int, grows it then just sets one bit
* as required.
*/
-int
-mp_2expt (mp_int * a, int b)
+mp_err mp_2expt(mp_int *a, int b)
{
- int res;
+ mp_err err;
- /* zero a as per default */
- mp_zero (a);
+ /* zero a as per default */
+ mp_zero(a);
- /* grow a to accomodate the single bit */
- if ((res = mp_grow (a, b / DIGIT_BIT + 1)) != MP_OKAY) {
- return res;
- }
+ /* grow a to accomodate the single bit */
+ if ((err = mp_grow(a, (b / MP_DIGIT_BIT) + 1)) != MP_OKAY) {
+ return err;
+ }
- /* set the used count of where the bit will go */
- a->used = b / DIGIT_BIT + 1;
+ /* set the used count of where the bit will go */
+ a->used = (b / MP_DIGIT_BIT) + 1;
- /* put the single bit in its place */
- a->dp[b / DIGIT_BIT] = ((mp_digit)1) << (b % DIGIT_BIT);
+ /* put the single bit in its place */
+ a->dp[b / MP_DIGIT_BIT] = (mp_digit)1 << (mp_digit)(b % MP_DIGIT_BIT);
- return MP_OKAY;
+ return MP_OKAY;
}
#endif
-
-/* $Source: /cvs/libtom/libtommath/bn_mp_2expt.c,v $ */
-/* $Revision: 1.4 $ */
-/* $Date: 2006/12/28 01:25:13 $ */