1/* $NetBSD: bn_mp_cmp_mag.c,v 1.2 2017/01/28 21:31:47 christos Exp $ */ 2 3#include <tommath.h> 4#ifdef BN_MP_CMP_MAG_C 5/* LibTomMath, multiple-precision integer library -- Tom St Denis 6 * 7 * LibTomMath is a library that provides multiple-precision 8 * integer arithmetic as well as number theoretic functionality. 9 * 10 * The library was designed directly after the MPI library by 11 * Michael Fromberger but has been written from scratch with 12 * additional optimizations in place. 13 * 14 * The library is free for all purposes without any express 15 * guarantee it works. 16 * 17 * Tom St Denis, tomstdenis@gmail.com, http://libtom.org 18 */ 19 20/* compare maginitude of two ints (unsigned) */ 21int mp_cmp_mag (mp_int * a, mp_int * b) 22{ 23 int n; 24 mp_digit *tmpa, *tmpb; 25 26 /* compare based on # of non-zero digits */ 27 if (a->used > b->used) { 28 return MP_GT; 29 } 30 31 if (a->used < b->used) { 32 return MP_LT; 33 } 34 35 /* alias for a */ 36 tmpa = a->dp + (a->used - 1); 37 38 /* alias for b */ 39 tmpb = b->dp + (a->used - 1); 40 41 /* compare based on digits */ 42 for (n = 0; n < a->used; ++n, --tmpa, --tmpb) { 43 if (*tmpa > *tmpb) { 44 return MP_GT; 45 } 46 47 if (*tmpa < *tmpb) { 48 return MP_LT; 49 } 50 } 51 return MP_EQ; 52} 53#endif 54 55/* Source: /cvs/libtom/libtommath/bn_mp_cmp_mag.c,v */ 56/* Revision: 1.4 */ 57/* Date: 2006/12/28 01:25:13 */ 58