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package cz.crcs.ectester.reader.test;
import cz.crcs.ectester.applet.ECTesterApplet;
import cz.crcs.ectester.applet.EC_Consts;
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 cz.crcs.ectester.common.ec.EC_Curve;
import cz.crcs.ectester.common.ec.EC_Key;
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(EC_Store dataStore, ECTesterReader.Config cfg) {
super(dataStore, cfg, "composite", "The composite suite tests ECDH over curves with composite order. This should generally fail, as using such a curve is unsafe.");
}
@Override
public void setup(CardMngr cardManager) {
/* Do the default tests 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 = dataStore.getObjects(EC_Key.class, "composite");
for (EC_Key key : keys.values()) {
EC_Curve curve = dataStore.getObject(EC_Curve.class, key.getCurve());
if (cfg.namedCurve != null && !(key.getCurve().startsWith(cfg.namedCurve) || key.getCurve().equals(cfg.namedCurve))) {
continue;
}
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)) {
tests.add(CommandTest.expect(new Command.Allocate(cardManager, ECTesterApplet.KEYPAIR_BOTH, curve.getBits(), curve.getField()), ExpectedValue.SUCCESS));
tests.add(CommandTest.expect(new Command.Set(cardManager, ECTesterApplet.KEYPAIR_BOTH, EC_Consts.CURVE_external, curve.getParams(), curve.flatten()), ExpectedValue.ANY));
tests.add(CommandTest.expect(new Command.Generate(cardManager, ECTesterApplet.KEYPAIR_LOCAL), ExpectedValue.ANY));
Command ecdhCommand = new Command.ECDH_direct(cardManager, ECTesterApplet.KEYPAIR_LOCAL, ECTesterApplet.EXPORT_FALSE, EC_Consts.CORRUPTION_NONE, EC_Consts.KA_ECDH, key.flatten());
tests.add(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."));
tests.add(CommandTest.expect(new Command.Cleanup(cardManager), ExpectedValue.ANY));
}
}
}
}
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