Mercurial > dropbear

comparison libtommath/bn_mp_cmp_mag.c @ 330:5488db2e9e4e

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
merge of 332f709a4cb39cde4cedab7c3be89e05f3023067 and ca4ca78b82c5d430c69ce01bf794e8886ce81431
author Matt Johnston <matt@ucc.asn.au>
date Sat, 10 Jun 2006 16:39:40 +0000
parents eed26cff980b
children 5ff8218bcee9
comparison
equal deleted inserted replaced
329:8ed0dce45126 330:5488db2e9e4e
1 #include <tommath.h>
2 #ifdef BN_MP_CMP_MAG_C
3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
4 *
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://math.libtomcrypt.org
16 */
17
18 /* compare maginitude of two ints (unsigned) */
19 int mp_cmp_mag (mp_int * a, mp_int * b)
20 {
21 int n;
22 mp_digit *tmpa, *tmpb;
23
24 /* compare based on # of non-zero digits */
25 if (a->used > b->used) {
26 return MP_GT;
27 }
28
29 if (a->used < b->used) {
30 return MP_LT;
31 }
32
33 /* alias for a */
34 tmpa = a->dp + (a->used - 1);
35
36 /* alias for b */
37 tmpb = b->dp + (a->used - 1);
38
39 /* compare based on digits */
40 for (n = 0; n < a->used; ++n, --tmpa, --tmpb) {
41 if (*tmpa > *tmpb) {
42 return MP_GT;
43 }
44
45 if (*tmpa < *tmpb) {
46 return MP_LT;
47 }
48 }
49 return MP_EQ;
50 }
51 #endif