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/*
 * Copyright (c) 2021 gematik GmbH
 * 
 * Licensed under the Apache License, Version 2.0 (the License);
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an 'AS IS' BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package de.gematik.rbellogger.converter.brainpool;

import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.math.BigInteger;
import java.security.spec.ECFieldFp;
import java.security.spec.ECParameterSpec;
import java.security.spec.ECPoint;
import java.security.spec.EllipticCurve;
import org.jose4j.jwa.AlgorithmFactoryFactory;
import org.jose4j.keys.EllipticCurves;

public class BrainpoolCurves {

    public static final String BP_256 = "BP-256";
    public static final String BP_384 = "BP-384";
    public static final String BP_512 = "BP-512";

    public static final ECParameterSpec BP256 = new ECParameterSpec(
        new EllipticCurve(new ECFieldFp(
            new BigInteger("76884956397045344220809746629001649093037950200943055203735601445031516197751")),
            new BigInteger("56698187605326110043627228396178346077120614539475214109386828188763884139993"),
            new BigInteger("17577232497321838841075697789794520262950426058923084567046852300633325438902")),
        new ECPoint(new BigInteger("63243729749562333355292243550312970334778175571054726587095381623627144114786"),
            new BigInteger("38218615093753523893122277964030810387585405539772602581557831887485717997975")),
        new BigInteger("76884956397045344220809746629001649092737531784414529538755519063063536359079"), 1);
    public static final ECParameterSpec BP384 = new ECParameterSpec(new EllipticCurve(new ECFieldFp(
        new BigInteger(
            "21659270770119316173069236842332604979796116387017648600081618503821089934025961822236561982844534088440708417973331")),
        new BigInteger(
            "19048979039598244295279281525021548448223459855185222892089532512446337024935426033638342846977861914875721218402342"),
        new BigInteger(
            "717131854892629093329172042053689661426642816397448020844407951239049616491589607702456460799758882466071646850065")),
        new ECPoint(new BigInteger(
            "4480579927441533893329522230328287337018133311029754539518372936441756157459087304048546502931308754738349656551198"),
            new BigInteger(
                "21354446258743982691371413536748675410974765754620216137225614281636810686961198361153695003859088327367976229294869")),
        new BigInteger(
            "21659270770119316173069236842332604979796116387017648600075645274821611501358515537962695117368903252229601718723941"),
        1);
    public static final ECParameterSpec BP512 = new ECParameterSpec(new EllipticCurve(new ECFieldFp(new BigInteger(
        "8948962207650232551656602815159153422162609644098354511344597187200057010413552439917934304191956942765446530386427345937963894309923928536070534607816947")),
        new BigInteger(
            "6294860557973063227666421306476379324074715770622746227136910445450301914281276098027990968407983962691151853678563877834221834027439718238065725844264138"),
        new BigInteger(
            "3245789008328967059274849584342077916531909009637501918328323668736179176583263496463525128488282611559800773506973771797764811498834995234341530862286627")),
        new ECPoint(new BigInteger(
            "6792059140424575174435640431269195087843153390102521881468023012732047482579853077545647446272866794936371522410774532686582484617946013928874296844351522"),
            new BigInteger(
                "6592244555240112873324748381429610341312712940326266331327445066687010545415256461097707483288650216992613090185042957716318301180159234788504307628509330")),
        new BigInteger(
            "8948962207650232551656602815159153422162609644098354511344597187200057010413418528378981730643524959857451398370029280583094215613882043973354392115544169"),
        1);
    private static boolean initialized;

    private static void addCurve(final String name, final ECParameterSpec spec) {
        try {
            final Method method = EllipticCurves.class
                .getDeclaredMethod("addCurve", String.class, ECParameterSpec.class);
            method.setAccessible(true);//NOSONAR
            method.invoke(BrainpoolCurves.class, name, spec);
        } catch (final InvocationTargetException | IllegalAccessException | NoSuchMethodException e) {
            throw new RuntimeException(
                "Error while adding BrainPool-Curves " + name + " to internal Algorithm-Suite repository", e);
        }
    }

    public static void init() {
        if (initialized) {
            return;
        }

        addCurve("BP-256", BP256);
        addCurve("BP-384", BP384);
        addCurve("BP-512", BP512);

        AlgorithmFactoryFactory.getInstance().getJwsAlgorithmFactory()
            .registerAlgorithm(new BrainpoolAlgorithmSuites.EcdsaBP256R1UsingSha256());
        AlgorithmFactoryFactory.getInstance().getJwsAlgorithmFactory()
            .registerAlgorithm(new BrainpoolAlgorithmSuites.EcdsaBP384R1UsingSha384());
        AlgorithmFactoryFactory.getInstance().getJwsAlgorithmFactory()
            .registerAlgorithm(new BrainpoolAlgorithmSuites.EcdsaBP512R1UsingSha512());

        initialized = true;
    }
}