47 lines
1.1 KiB
C
47 lines
1.1 KiB
C
/* LibTomPoly, Polynomial Basis Math -- Tom St Denis
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*
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* LibTomPoly is a public domain library that provides
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* polynomial basis arithmetic support. It relies on
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* LibTomMath for large integer support.
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*
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* This library is free for all purposes without any
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* express guarantee that it works.
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*
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* Tom St Denis, tomstdenis@iahu.ca, http://poly.libtomcrypt.org
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*/
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#include <tompoly.h>
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int pb_grow(pb_poly *a, int size)
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{
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mp_int *tmp;
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int x, err;
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if (a->alloc < size) {
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/* pad size upwards */
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size += (PB_TERMS - (size % PB_TERMS));
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/* regrow terms */
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tmp = realloc(a->terms, sizeof(mp_int) * size);
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if (tmp == NULL) {
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return MP_MEM;
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}
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a->terms = tmp;
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/* zero the new stuff (prevents mp_clear from double freeing) */
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memset(a->terms + a->alloc, 0, (size - a->alloc) * sizeof(mp_int));
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/* now init the terms */
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for (x = a->alloc; x < size; x++) {
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if ((err = mp_init(&(a->terms[x]))) != MP_OKAY) {
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return err;
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}
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}
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/* update info */
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a->alloc = size;
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}
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return MP_OKAY;
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}
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