|
2
|
1 /* LibTomMath, multiple-precision integer library -- Tom St Denis |
|
|
2 * |
|
|
3 * LibTomMath is a library that provides multiple-precision |
|
|
4 * integer arithmetic as well as number theoretic functionality. |
|
|
5 * |
|
|
6 * The library was designed directly after the MPI library by |
|
|
7 * Michael Fromberger but has been written from scratch with |
|
|
8 * additional optimizations in place. |
|
|
9 * |
|
|
10 * The library is free for all purposes without any express |
|
|
11 * guarantee it works. |
|
|
12 * |
|
|
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org |
|
|
14 */ |
|
|
15 #include <tommath.h> |
|
|
16 |
|
|
17 /* init an mp_init for a given size */ |
|
|
18 int mp_init_size (mp_int * a, int size) |
|
|
19 { |
|
|
20 /* pad size so there are always extra digits */ |
|
|
21 size += (MP_PREC * 2) - (size % MP_PREC); |
|
|
22 |
|
|
23 /* alloc mem */ |
|
|
24 a->dp = OPT_CAST(mp_digit) XCALLOC (sizeof (mp_digit), size); |
|
|
25 if (a->dp == NULL) { |
|
|
26 return MP_MEM; |
|
|
27 } |
|
|
28 a->used = 0; |
|
|
29 a->alloc = size; |
|
|
30 a->sign = MP_ZPOS; |
|
|
31 |
|
|
32 return MP_OKAY; |
|
|
33 } |
