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comparison libtommath/bn_mp_init_size.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_INIT_SIZE_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 /* init an mp_init for a given size */
19 int mp_init_size (mp_int * a, int size)
20 {
21 int x;
22
23 /* pad size so there are always extra digits */
24 size += (MP_PREC * 2) - (size % MP_PREC);
25
26 /* alloc mem */
27 a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * size);
28 if (a->dp == NULL) {
29 return MP_MEM;
30 }
31
32 /* set the members */
33 a->used = 0;
34 a->alloc = size;
35 a->sign = MP_ZPOS;
36
37 /* zero the digits */
38 for (x = 0; x < size; x++) {
39 a->dp[x] = 0;
40 }
41
42 return MP_OKAY;
43 }
44 #endif