34 lines
961 B
C
34 lines
961 B
C
/* LibTomMath, multiple-precision integer library -- Tom St Denis
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*
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* LibTomMath is library that provides for multiple-precision
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* integer arithmetic as well as number theoretic functionality.
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*
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* The library is designed directly after the MPI library by
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* Michael Fromberger but has been written from scratch with
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* additional optimizations in place.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://math.libtomcrypt.org
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*/
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#include <tommath.h>
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/* init a mp_init and grow it to a given size */
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int
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mp_init_size (mp_int * a, int size)
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{
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/* pad up so there are at least 16 zero digits */
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size += (MP_PREC * 2) - (size & (MP_PREC - 1)); /* ensure there are always at least 16 digits extra on top */
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a->dp = calloc (sizeof (mp_digit), size);
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if (a->dp == NULL) {
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return MP_MEM;
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}
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a->used = 0;
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a->alloc = size;
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a->sign = MP_ZPOS;
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return MP_OKAY;
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}
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