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comparison libtommath/bn_mp_reduce_is_2k_l.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
comparison
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1562:768ebf737aa0 1739:13d834efc376
1 #include <tommath_private.h> 1 #include "tommath_private.h"
2 #ifdef BN_MP_REDUCE_IS_2K_L_C 2 #ifdef BN_MP_REDUCE_IS_2K_L_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 /* determines if reduce_2k_l can be used */ 6 /* determines if reduce_2k_l can be used */
19 int mp_reduce_is_2k_l(mp_int *a) 7 mp_bool mp_reduce_is_2k_l(const mp_int *a)
20 { 8 {
21 int ix, iy; 9 int ix, iy;
22 10
23 if (a->used == 0) { 11 if (a->used == 0) {
24 return MP_NO; 12 return MP_NO;
25 } else if (a->used == 1) { 13 } else if (a->used == 1) {
26 return MP_YES; 14 return MP_YES;
27 } else if (a->used > 1) { 15 } else if (a->used > 1) {
28 /* if more than half of the digits are -1 we're sold */ 16 /* if more than half of the digits are -1 we're sold */
29 for (iy = ix = 0; ix < a->used; ix++) { 17 for (iy = ix = 0; ix < a->used; ix++) {
30 if (a->dp[ix] == MP_MASK) { 18 if (a->dp[ix] == MP_DIGIT_MAX) {
31 ++iy; 19 ++iy;
32 } 20 }
33 } 21 }
34 return (iy >= (a->used/2)) ? MP_YES : MP_NO; 22 return (iy >= (a->used/2)) ? MP_YES : MP_NO;
35 23 } else {
24 return MP_NO;
36 } 25 }
37 return MP_NO;
38 } 26 }
39 27
40 #endif 28 #endif
41
42 /* ref: $Format:%D$ */
43 /* git commit: $Format:%H$ */
44 /* commit time: $Format:%ai$ */