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annotate libtommath/bn_mp_cmp_mag.c @ 1689:d2d3b5ba6c64

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update travis to Ubuntu focal to provide chacha20
author Matt Johnston <matt@ucc.asn.au>
date Tue, 26 May 2020 23:13:48 +0800
parents f52919ffd3b1
children 1051e4eea25a
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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_CMP_MAG_C
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3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
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4 *
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5 * LibTomMath is a library that provides multiple-precision
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6 * integer arithmetic as well as number theoretic functionality.
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7 *
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8 * The library was designed directly after the MPI library by
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9 * Michael Fromberger but has been written from scratch with
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10 * additional optimizations in place.
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11 *
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12 * SPDX-License-Identifier: Unlicense
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13 */
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14
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15 /* compare maginitude of two ints (unsigned) */
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16 int mp_cmp_mag(const mp_int *a, const mp_int *b)
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17 {
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18 int n;
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19 mp_digit *tmpa, *tmpb;
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20
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21 /* compare based on # of non-zero digits */
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22 if (a->used > b->used) {
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23 return MP_GT;
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24 }
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25
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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26 if (a->used < b->used) {
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27 return MP_LT;
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28 }
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30 /* alias for a */
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31 tmpa = a->dp + (a->used - 1);
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33 /* alias for b */
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34 tmpb = b->dp + (a->used - 1);
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35
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parents: 1470
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36 /* compare based on digits */
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37 for (n = 0; n < a->used; ++n, --tmpa, --tmpb) {
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38 if (*tmpa > *tmpb) {
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39 return MP_GT;
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40 }
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41
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42 if (*tmpa < *tmpb) {
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43 return MP_LT;
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44 }
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45 }
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46 return MP_EQ;
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47 }
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48 #endif
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49
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50 /* ref: HEAD -> master, tag: v1.1.0 */
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51 /* git commit: 08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
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52 /* commit time: 2019-01-28 20:32:32 +0100 */