tommath/bn_mp_init.c

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#include <tommath_private.h>
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#ifdef BN_MP_INIT_C
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/* LibTomMath, multiple-precision integer library -- Tom St Denis
*
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* LibTomMath is a library that provides multiple-precision
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* integer arithmetic as well as number theoretic functionality.
*
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* The library was designed directly after the MPI library by
* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tstdenis82@gmail.com, http://libtom.org
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*/
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/* init a new mp_int */
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int mp_init(mp_int *a)
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{
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int i;
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/* allocate memory required and clear it */
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a->dp = OPT_CAST(mp_digit) XMALLOC(sizeof(mp_digit) * (size_t)MP_PREC);
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if (a->dp == NULL) {
return MP_MEM;
}
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/* set the digits to zero */
for (i = 0; i < MP_PREC; i++) {
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a->dp[i] = 0;
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}
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/* set the used to zero, allocated digits to the default precision
* and sign to positive */
a->used = 0;
a->alloc = MP_PREC;
a->sign = MP_ZPOS;
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return MP_OKAY;
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}
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#endif
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/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */