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lightning-sunbird  0.9+nobinonly
ecl_curve.c
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00001 /* 
00002  * ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the elliptic curve math library.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Sun Microsystems, Inc.
00019  * Portions created by the Initial Developer are Copyright (C) 2003
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   Douglas Stebila <douglas@stebila.ca>, Sun Microsystems Laboratories
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either the GNU General Public License Version 2 or later (the "GPL"), or
00027  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
00030  * under the terms of either the GPL or the LGPL, and not to allow others to
00031  * use your version of this file under the terms of the MPL, indicate your
00032  * decision by deleting the provisions above and replace them with the notice
00033  * and other provisions required by the GPL or the LGPL. If you do not delete
00034  * the provisions above, a recipient may use your version of this file under
00035  * the terms of any one of the MPL, the GPL or the LGPL.
00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "ecl.h"
00040 #include "ecl-curve.h"
00041 #include "ecl-priv.h"
00042 #include <stdlib.h>
00043 #include <string.h>
00044 
00045 #define CHECK(func) if ((func) == NULL) { res = 0; goto CLEANUP; }
00046 
00047 /* Duplicates an ECCurveParams */
00048 ECCurveParams *
00049 ECCurveParams_dup(const ECCurveParams * params)
00050 {
00051        int res = 1;
00052        ECCurveParams *ret = NULL;
00053 
00054        CHECK(ret = (ECCurveParams *) calloc(1, sizeof(ECCurveParams)));
00055        if (params->text != NULL) {
00056               CHECK(ret->text = strdup(params->text));
00057        }
00058        ret->field = params->field;
00059        ret->size = params->size;
00060        if (params->irr != NULL) {
00061               CHECK(ret->irr = strdup(params->irr));
00062        }
00063        if (params->curvea != NULL) {
00064               CHECK(ret->curvea = strdup(params->curvea));
00065        }
00066        if (params->curveb != NULL) {
00067               CHECK(ret->curveb = strdup(params->curveb));
00068        }
00069        if (params->genx != NULL) {
00070               CHECK(ret->genx = strdup(params->genx));
00071        }
00072        if (params->geny != NULL) {
00073               CHECK(ret->geny = strdup(params->geny));
00074        }
00075        if (params->order != NULL) {
00076               CHECK(ret->order = strdup(params->order));
00077        }
00078        ret->cofactor = params->cofactor;
00079 
00080   CLEANUP:
00081        if (res != 1) {
00082               EC_FreeCurveParams(ret);
00083               return NULL;
00084        }
00085        return ret;
00086 }
00087 
00088 #undef CHECK
00089 
00090 /* Construct ECCurveParams from an ECCurveName */
00091 ECCurveParams *
00092 EC_GetNamedCurveParams(const ECCurveName name)
00093 {
00094        if ((name <= ECCurve_noName) || (ECCurve_pastLastCurve <= name) ||
00095                                    (ecCurve_map[name] == NULL)) {
00096               return NULL;
00097        } else {
00098               return ECCurveParams_dup(ecCurve_map[name]);
00099        }
00100 }
00101 
00102 /* Free the memory allocated (if any) to an ECCurveParams object. */
00103 void
00104 EC_FreeCurveParams(ECCurveParams * params)
00105 {
00106        if (params == NULL)
00107               return;
00108        if (params->text != NULL)
00109               free(params->text);
00110        if (params->irr != NULL)
00111               free(params->irr);
00112        if (params->curvea != NULL)
00113               free(params->curvea);
00114        if (params->curveb != NULL)
00115               free(params->curveb);
00116        if (params->genx != NULL)
00117               free(params->genx);
00118        if (params->geny != NULL)
00119               free(params->geny);
00120        if (params->order != NULL)
00121               free(params->order);
00122        free(params);
00123 }