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comparison libtommath/bn_mp_clear.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_CLEAR_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 /* clear one (frees) */
19 void
20 mp_clear (mp_int * a)
21 {
22 volatile mp_digit *p;
23 int len;
24
25 /* only do anything if a hasn't been freed previously */
26 if (a->dp != NULL) {
27 /* first zero the digits */
28 len = a->alloc;
29 p = a->dp;
30 while (len--) {
31 *p++ = 0;
32 }
33
34 /* free ram */
35 XFREE(a->dp);
36
37 /* reset members to make debugging easier */
38 a->dp = NULL;
39 a->alloc = a->used = 0;
40 a->sign = MP_ZPOS;
41 }
42 }
43 #endif