mozilla/security/nss/lib/freebl/ecl/ecl_curve.c

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#include "ecl.h"
#include "ecl-curve.h"
#include "ecl-priv.h"
#include <stdlib.h>
#include <string.h>

#define CHECK(func) if ((func) == NULL) { res = 0; goto CLEANUP; }

/* Duplicates an ECCurveParams */
ECCurveParams *
ECCurveParams_dup(const ECCurveParams * params)
{
	int res = 1;
	ECCurveParams *ret = NULL;

	CHECK(ret = (ECCurveParams *) calloc(1, sizeof(ECCurveParams)));
	if (params->text != NULL) {
		CHECK(ret->text = strdup(params->text));
	}
	ret->field = params->field;
	ret->size = params->size;
	if (params->irr != NULL) {
		CHECK(ret->irr = strdup(params->irr));
	}
	if (params->curvea != NULL) {
		CHECK(ret->curvea = strdup(params->curvea));
	}
	if (params->curveb != NULL) {
		CHECK(ret->curveb = strdup(params->curveb));
	}
	if (params->genx != NULL) {
		CHECK(ret->genx = strdup(params->genx));
	}
	if (params->geny != NULL) {
		CHECK(ret->geny = strdup(params->geny));
	}
	if (params->order != NULL) {
		CHECK(ret->order = strdup(params->order));
	}
	ret->cofactor = params->cofactor;

  CLEANUP:
	if (res != 1) {
		EC_FreeCurveParams(ret);
		return NULL;
	}
	return ret;
}

#undef CHECK

/* Construct ECCurveParams from an ECCurveName */
ECCurveParams *
EC_GetNamedCurveParams(const ECCurveName name)
{
	if ((name <= ECCurve_noName) || (ECCurve_pastLastCurve <= name) ||
					(ecCurve_map[name] == NULL)) {
		return NULL;
	} else {
		return ECCurveParams_dup(ecCurve_map[name]);
	}
}

/* Free the memory allocated (if any) to an ECCurveParams object. */
void
EC_FreeCurveParams(ECCurveParams * params)
{
	if (params == NULL)
		return;
	if (params->text != NULL)
		free(params->text);
	if (params->irr != NULL)
		free(params->irr);
	if (params->curvea != NULL)
		free(params->curvea);
	if (params->curveb != NULL)
		free(params->curveb);
	if (params->genx != NULL)
		free(params->genx);
	if (params->geny != NULL)
		free(params->geny);
	if (params->order != NULL)
		free(params->order);
	free(params);
}