package cz.crcs.ectester.reader.test;

import cz.crcs.ectester.applet.ECTesterApplet;
import cz.crcs.ectester.applet.EC_Consts;
import cz.crcs.ectester.common.ec.EC_Curve;
import cz.crcs.ectester.common.ec.EC_Key;
import cz.crcs.ectester.common.output.TestWriter;
import cz.crcs.ectester.data.EC_Store;
import cz.crcs.ectester.reader.CardMngr;
import cz.crcs.ectester.reader.ECTesterReader;
import cz.crcs.ectester.reader.command.Command;
import javacard.security.KeyPair;

import java.util.Map;

import static cz.crcs.ectester.common.test.Result.ExpectedValue;

/**
 * @author Jan Jancar johny@neuromancer.sk
 */
public class CardCompositeCurvesSuite extends CardTestSuite {

    public CardCompositeCurvesSuite(TestWriter writer, ECTesterReader.Config cfg, CardMngr cardManager) {
        super(writer, cfg, cardManager, "composite", "The composite suite run ECDH over curves with composite order. This should generally fail, as using such a curve is unsafe.");
    }

    @Override
    protected void runTests() throws Exception {
        /* Do the default run with the public keys set to provided smallorder keys
         * over composite order curves. Essentially small subgroup attacks.
         * These should fail, the curves aren't safe so that if the computation with
         * a small order public key succeeds the private key modulo the public key order
         * is revealed.
         */
        Map<String, EC_Key> keys = EC_Store.getInstance().getObjects(EC_Key.class, "composite");
        for (EC_Key key : keys.values()) {
            EC_Curve curve = EC_Store.getInstance().getObject(EC_Curve.class, key.getCurve());
            if (curve.getField() == KeyPair.ALG_EC_FP && !cfg.primeField || curve.getField() == KeyPair.ALG_EC_F2M && !cfg.binaryField) {
                continue;
            }
            if ((curve.getBits() == cfg.bits || cfg.all)) {
                doTest(CommandTest.expect(new Command.Allocate(this.card, ECTesterApplet.KEYPAIR_BOTH, curve.getBits(), curve.getField()), ExpectedValue.SUCCESS));
                doTest(CommandTest.expect(new Command.Set(this.card, ECTesterApplet.KEYPAIR_BOTH, EC_Consts.CURVE_external, curve.getParams(), curve.flatten()), ExpectedValue.ANY));
                doTest(CommandTest.expect(new Command.Generate(this.card, ECTesterApplet.KEYPAIR_LOCAL), ExpectedValue.ANY));
                Command ecdhCommand = new Command.ECDH_direct(this.card, ECTesterApplet.KEYPAIR_LOCAL, ECTesterApplet.EXPORT_FALSE, EC_Consts.CORRUPTION_NONE, ECTesterApplet.KeyAgreement_ALG_EC_SVDP_DH, key.flatten());
                doTest(CommandTest.expect(ecdhCommand, ExpectedValue.FAILURE, "Card correctly rejected to do ECDH over a composite order curve.", "Card incorrectly does ECDH over a composite order curve, leaks bits of private key."));
                new Command.Cleanup(this.card).send();
            }
        }
    }
}