52 lines
1.2 KiB
C
52 lines
1.2 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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/* dest = src */
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int pb_copy(pb_poly *src, pb_poly *dest)
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{
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int err, x;
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/* avoid trivial copies */
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if (src == dest) {
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return MP_OKAY;
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}
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/* grow dest as required */
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if (dest->alloc < src->used) {
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if ((err = pb_grow(dest, src->used)) != MP_OKAY) {
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return err;
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}
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}
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/* set the characteristic */
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if ((err = mp_copy(&(src->characteristic), &(dest->characteristic))) != MP_OKAY) {
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return err;
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}
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/* copy digits */
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for (x = 0; x < src->used; x++) {
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if ((err = mp_copy(&(src->terms[x]), &(dest->terms[x]))) != MP_OKAY) {
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return err;
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}
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}
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/* zero excess digits */
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for (x = src->used; x < dest->used; x++) {
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mp_zero(&(dest->terms[x]));
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}
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dest->used = src->used;
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return MP_OKAY;
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}
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