/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 */

package sun.security.provider;

import java.math.BigInteger;

import java.security.*;

import java.security.SecureRandom;

import java.security.spec.AlgorithmParameterSpec;

/**

 * A fake DSA key pair generator

 */

class DSAKeyPairGenerator extends KeyPairGenerator {

    private int plen;

    DSAKeyPairGenerator(int defaultKeySize) {

        super("DSA");

        this.plen = defaultKeySize;

    }

    public void initialize(int modlen, SecureRandom random) {

        this.plen = modlen;

    }

    public void initialize(AlgorithmParameterSpec params, SecureRandom random) {

        throw new UnsupportedOperationException();

    }

    public KeyPair generateKeyPair() {

        BigInteger p, q, g, x, y;

        switch (plen) {

            case 1024:

                p = new BigInteger("178011905478542266528237562450159990145232"

                        + "156369120674273274450314442865788737020770612695252"

                        + "123463079567156784778466449970650770920727857050009"

                        + "668388144034129745221171818506047231150039301079959"

                        + "358067395348717066319802262019714966524135060945913"

                        + "707594956514672855690606794135837542707371727429551"

                        + "343320695239");

                q = new BigInteger("864205495604807476120572616017955259175325"

                        + "408501");

                g = new BigInteger("174068207532402095185811980123523436538604"

                        + "490794561350978495831040599953488455823147851597408"

                        + "940950725307797094915759492368300574252438761037084"

                        + "473467180148876118103083043754985190983472601550494"

                        + "691329488083395492313850000361646482644608492304078"

                        + "721818959999056496097769368017749273708962006689187"

                        + "956744210730");

                x = new BigInteger("442684721233431748836258763370873041965448"

                        + "305045");

                y = new BigInteger("123777377875361061959303516913138943002334"

                        + "907914087825062123737715425120688699041350157178201"

                        + "400875613890444051801751930684745642628053940339973"

                        + "838660880918443284038995141330502246221730915504106"

                        + "313025753680709037893119973285385498869618080832350"

                        + "844717549458284541384384444940685082987448444197127"

                        + "109727215326");

                break;

            case 3072:

                p = new BigInteger("532424770282957507167558442446475365039221"

                        + "865310725601984444684810811113744209961033785957055"

                        + "545569814329215072178264469737927701168579964248618"

                        + "212671015750272795670312875451455848633455356647610"

                        + "802537682630581977793580392148938495801039643027210"

                        + "168055234243089546290868853109011307872303192870862"

                        + "928522910714047973751079687063489704904165319118754"

                        + "414656318529199596549052269402875554159175957058778"

                        + "440558421673575502884909440510567191072050738584727"

                        + "120524174557883883057055053123583287619621138916493"

                        + "103747092870334536468061850120264153241617645557971"

                        + "369719361654590867807897284715299844320510777830158"

                        + "726099043158186232574541934847234927190558272654504"

                        + "899757279197741136733127726856995584055651857157703"

                        + "730144527174175430693903863066052387871964460507889"

                        + "647358151911550149297202134918108185581732063173116"

                        + "923323722454275514471399056679497166381315291238166"

                        + "678637058042047687405023560967657729197010282296512"

                        + "1019243318222397");

                q = new BigInteger("890750162030504407723769200757822201430799"

                        + "34855896740921457815099167207156753");

                g = new BigInteger("151817606774376623890824510431247991418389"

                        + "715779225250508738780526725946562383344295250350988"

                        + "771843988677909140611473778208677098146023000408394"

                        + "159085130929460916510001933636711147155614261913281"

                        + "024881629605746742555704817858764668833915862917006"

                        + "598838541275997577579609978297421111961935816027196"

                        + "483840098753346970227821715342000582711792748060856"

                        + "726896896804543780217869880654497603605897208724113"

                        + "159746510357451233393865294043543249227656881945445"

                        + "911394836487973565655780621125471620102365417701222"

                        + "942700788591992318925980959657031578942777920589286"

                        + "616050851348109471636081284309144953091734152913609"

                        + "446411782660994503265873790796828974300693496175976"

                        + "687169380996928285288177682058646187108156643041984"

                        + "849723272840833108573298006600021948389582796433112"

                        + "947515654733901137745000270350091408182905439114222"

                        + "789179830877253611946986888461931792357280552721443"

                        + "254779196196933589018709692301251250169609249601817"

                        + "4795480503442737");

                x = new BigInteger("837184725379267020693579006510066460977336"

                        + "11851797067505263114214549968402803");

                y = new BigInteger("395340495486576955293430186860596538887519"

                        + "532234445217156133155957480616804094258448364164620"

                        + "019669119585215430588435624960233328621409901309332"

                        + "192899527076171337665680476899693664056285881110265"

                        + "747619109873269836751712303602309960796986216520795"

                        + "801714761851172570535758859846766099312622783018124"

                        + "479033035974495130498276693342256396509951099944860"

                        + "886247767918456849069941054372775951688384599525157"

                        + "707186634084399395289878437457318095050730531728857"

                        + "772445883395712924633196197942869159234956079072812"

                        + "033713932103618702222793066673087288841096282175640"

                        + "243353943285718935517693389945339235110435667386410"

                        + "827568246083609394541667076709869892137539964277111"

                        + "881671381034966060604088870102183420000265271778711"

                        + "380501229707440889595235145225482336904915838699846"

                        + "941323450568220944649213026904670943083185766542427"

                        + "196471392765688014947830444837953042683779059773143"

                        + "877079141940001705246446188097009313372159366032655"

                        + "5436444354063312");

                break;

            default:

                throw new AssertionError("Unknown keySize " + plen);

        }

        try {

            return new KeyPair(new DSAPublicKeyImpl(y, p, q, g),

                    new DSAPrivateKey(x, p, q, g));

        } catch (InvalidKeyException e) {

            throw new ProviderException(e);

        }

    }

}