59 lines
1.3 KiB
C
59 lines
1.3 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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/* initialize a */
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int pb_init_size(pb_poly *a, mp_int *characteristic, int size)
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{
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int x, y, err;
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/* enforce a minimum size */
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if (size < 1) {
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size = 1;
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}
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/* pad size upwards */
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size += (PB_TERMS - (size % PB_TERMS));
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/* init characteristic */
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if ((err = mp_init_copy(&(a->characteristic), characteristic)) != MP_OKAY) {
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return err;
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}
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/* now allocate an array of mp_ints */
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if ((a->terms = calloc(size, sizeof(mp_int))) == NULL) {
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mp_clear(&(a->characteristic));
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return MP_MEM;
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}
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/* now initialize them all */
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for (x = 0; x < size; x++) {
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if ((err = mp_init(&(a->terms[x]))) != MP_OKAY) {
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/* free stuff */
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for (y = 0; y < x; y++) {
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mp_clear(&(a->terms[y]));
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}
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free(a->terms);
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mp_clear(&(a->characteristic));
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return err;
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}
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}
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/* set our parameters */
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a->used = 0;
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a->alloc = size;
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return MP_OKAY;
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}
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