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comparison bn_mp_init.c @ 142:d29b64170cf0 libtommath-orig

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import of libtommath 0.32
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:33:56 +0000
parents 86e0b50a9b58
children
comparison
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19:e1037a1e12e7 142:d29b64170cf0
1 #include <tommath.h>
2 #ifdef BN_MP_INIT_C
1 /* LibTomMath, multiple-precision integer library -- Tom St Denis 3 /* LibTomMath, multiple-precision integer library -- Tom St Denis
2 * 4 *
3 * LibTomMath is a library that provides multiple-precision 5 * LibTomMath is a library that provides multiple-precision
4 * integer arithmetic as well as number theoretic functionality. 6 * integer arithmetic as well as number theoretic functionality.
5 * 7 *
10 * The library is free for all purposes without any express 12 * The library is free for all purposes without any express
11 * guarantee it works. 13 * guarantee it works.
12 * 14 *
13 * Tom St Denis, [email protected], http://math.libtomcrypt.org 15 * Tom St Denis, [email protected], http://math.libtomcrypt.org
14 */ 16 */
15 #include <tommath.h>
16 17
17 /* init a new bigint */ 18 /* init a new mp_int */
18 int mp_init (mp_int * a) 19 int mp_init (mp_int * a)
19 { 20 {
21 int i;
22
20 /* allocate memory required and clear it */ 23 /* allocate memory required and clear it */
21 a->dp = OPT_CAST(mp_digit) XCALLOC (sizeof (mp_digit), MP_PREC); 24 a->dp = OPT_CAST(mp_digit) XMALLOC (sizeof (mp_digit) * MP_PREC);
22 if (a->dp == NULL) { 25 if (a->dp == NULL) {
23 return MP_MEM; 26 return MP_MEM;
27 }
28
29 /* set the digits to zero */
30 for (i = 0; i < MP_PREC; i++) {
31 a->dp[i] = 0;
24 } 32 }
25 33
26 /* set the used to zero, allocated digits to the default precision 34 /* set the used to zero, allocated digits to the default precision
27 * and sign to positive */ 35 * and sign to positive */
28 a->used = 0; 36 a->used = 0;
29 a->alloc = MP_PREC; 37 a->alloc = MP_PREC;
30 a->sign = MP_ZPOS; 38 a->sign = MP_ZPOS;
31 39
32 return MP_OKAY; 40 return MP_OKAY;
33 } 41 }
42 #endif