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comparison libtommath/bn_mp_cmp_d.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_D_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 a digit */
19 int mp_cmp_d(mp_int * a, mp_digit b)
20 {
21 /* compare based on sign */
22 if (a->sign == MP_NEG) {
23 return MP_LT;
24 }
25
26 /* compare based on magnitude */
27 if (a->used > 1) {
28 return MP_GT;
29 }
30
31 /* compare the only digit of a to b */
32 if (a->dp[0] > b) {
33 return MP_GT;
34 } else if (a->dp[0] < b) {
35 return MP_LT;
36 } else {
37 return MP_EQ;
38 }
39 }
40 #endif