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comparison libtommath/bn_mp_cmp_mag.c @ 284:eed26cff980b

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propagate from branch 'au.asn.ucc.matt.ltm.dropbear' (head 6c790cad5a7fa866ad062cb3a0c279f7ba788583) to branch 'au.asn.ucc.matt.dropbear' (head fff0894a0399405a9410ea1c6d118f342cf2aa64)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:49 +0000
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children 5ff8218bcee9
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283:bd240aa12ba7 284:eed26cff980b
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