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comparison libtommath/bn_mp_clamp.c @ 1739:13d834efc376 fuzz

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merge from main
author Matt Johnston <matt@ucc.asn.au>
date Thu, 15 Oct 2020 19:55:15 +0800
parents 1051e4eea25a
children
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1562:768ebf737aa0 1739:13d834efc376
1 #include <tommath_private.h> 1 #include "tommath_private.h"
2 #ifdef BN_MP_CLAMP_C 2 #ifdef BN_MP_CLAMP_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
4 * 4 /* SPDX-License-Identifier: Unlicense */
5 * LibTomMath is a library that provides multiple-precision
6 * integer arithmetic as well as number theoretic functionality.
7 *
8 * The library was designed directly after the MPI library by
9 * Michael Fromberger but has been written from scratch with
10 * additional optimizations in place.
11 *
12 * The library is free for all purposes without any express
13 * guarantee it works.
14 *
15 * Tom St Denis, [email protected], http://libtom.org
16 */
17 5
18 /* trim unused digits 6 /* trim unused digits
19 * 7 *
20 * This is used to ensure that leading zero digits are 8 * This is used to ensure that leading zero digits are
21 * trimed and the leading "used" digit will be non-zero 9 * trimed and the leading "used" digit will be non-zero
22 * Typically very fast. Also fixes the sign if there 10 * Typically very fast. Also fixes the sign if there
23 * are no more leading digits 11 * are no more leading digits
24 */ 12 */
25 void 13 void mp_clamp(mp_int *a)
26 mp_clamp (mp_int * a)
27 { 14 {
28 /* decrease used while the most significant digit is 15 /* decrease used while the most significant digit is
29 * zero. 16 * zero.
30 */ 17 */
31 while ((a->used > 0) && (a->dp[a->used - 1] == 0)) { 18 while ((a->used > 0) && (a->dp[a->used - 1] == 0u)) {
32 --(a->used); 19 --(a->used);
33 } 20 }
34 21
35 /* reset the sign flag if used == 0 */ 22 /* reset the sign flag if used == 0 */
36 if (a->used == 0) { 23 if (a->used == 0) {
37 a->sign = MP_ZPOS; 24 a->sign = MP_ZPOS;
38 } 25 }
39 } 26 }
40 #endif 27 #endif
41
42 /* ref: $Format:%D$ */
43 /* git commit: $Format:%H$ */
44 /* commit time: $Format:%ai$ */