Mercurial > dropbear

annotate libtommath/bn_mp_reduce_is_2k_l.c @ 1719:25b0ce1936c4

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changelog for 2020.79
author Matt Johnston <matt@ucc.asn.au>
date Mon, 15 Jun 2020 23:36:14 +0800
parents 1051e4eea25a
children
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1655
f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
Steffen Jaeckel <s_jaeckel@gmx.de>
parents: 1470
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1 #include "tommath_private.h"
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2 #ifdef BN_MP_REDUCE_IS_2K_L_C
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1051e4eea25a Update LibTomMath to 1.2.0 (#84)
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis */
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4 /* SPDX-License-Identifier: Unlicense */
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5
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6 /* determines if reduce_2k_l can be used */
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7 mp_bool mp_reduce_is_2k_l(const mp_int *a)
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8 {
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9 int ix, iy;
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f52919ffd3b1 update ltm to 1.1.0 and enable FIPS 186.4 compliant key-generation (#79)
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parents: 1470
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10
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11 if (a->used == 0) {
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12 return MP_NO;
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13 } else if (a->used == 1) {
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14 return MP_YES;
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15 } else if (a->used > 1) {
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16 /* if more than half of the digits are -1 we're sold */
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17 for (iy = ix = 0; ix < a->used; ix++) {
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18 if (a->dp[ix] == MP_DIGIT_MAX) {
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parents: 1470
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19 ++iy;
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parents: 1470
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20 }
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21 }
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22 return (iy >= (a->used/2)) ? MP_YES : MP_NO;
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23 } else {
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24 return MP_NO;
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25 }
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26 }
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28 #endif