/**
   * Test Sign & Verify with test parameters see:
   * http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
   * gostR3410-2001-TestParamSet P.46
   */
  private void ecGOST3410_TestParam() {
    SecureRandom random = new SecureRandom();

    BigInteger mod_p =
        new BigInteger(
            "57896044618658097711785492504343953926634992332820282019728792003956564821041"); // p

    ECCurve.Fp curve =
        new ECCurve.Fp(
            mod_p, // p
            new BigInteger("7"), // a
            new BigInteger(
                "43308876546767276905765904595650931995942111794451039583252968842033849580414")); // b

    ECDomainParameters params =
        new ECDomainParameters(
            curve,
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(mod_p, new BigInteger("2")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "4018974056539037503335449422937059775635739389905545080690979365213431566280"))), // y
            new BigInteger(
                "57896044618658097711785492504343953927082934583725450622380973592137631069619")); // q

    ECKeyPairGenerator pGen = new ECKeyPairGenerator();
    ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(params, random);

    pGen.init(genParam);

    AsymmetricCipherKeyPair pair = pGen.generateKeyPair();

    ParametersWithRandom param = new ParametersWithRandom(pair.getPrivate(), random);

    ECGOST3410Signer ecgost3410 = new ECGOST3410Signer();

    ecgost3410.init(true, param);

    // get hash message using the digest GOST3411.
    byte[] message = "Message for sign".getBytes();
    GOST3411Digest gost3411 = new GOST3411Digest();
    gost3411.update(message, 0, message.length);
    byte[] hashmessage = new byte[gost3411.getDigestSize()];
    gost3411.doFinal(hashmessage, 0);

    BigInteger[] sig = ecgost3410.generateSignature(hashmessage);

    ecgost3410.init(false, pair.getPublic());

    if (!ecgost3410.verifySignature(hashmessage, sig[0], sig[1])) {
      fail("signature fails");
    }
  }
  /**
   * Test Sign & Verify with B parameters see:
   * http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
   * gostR3410-2001-CryptoPro-B-ParamSet P.47-48
   */
  private void ecGOST3410_BParam() {
    SecureRandom random = new SecureRandom();

    BigInteger mod_p =
        new BigInteger(
            "57896044618658097711785492504343953926634992332820282019728792003956564823193"); // p

    ECCurve.Fp curve =
        new ECCurve.Fp(
            mod_p, // p
            new BigInteger(
                "57896044618658097711785492504343953926634992332820282019728792003956564823190"), // a
            new BigInteger(
                "28091019353058090096996979000309560759124368558014865957655842872397301267595")); // b

    ECDomainParameters params =
        new ECDomainParameters(
            curve,
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(mod_p, new BigInteger("1")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "28792665814854611296992347458380284135028636778229113005756334730996303888124"))), // y
            new BigInteger(
                "57896044618658097711785492504343953927102133160255826820068844496087732066703")); // q

    ECKeyPairGenerator pGen = new ECKeyPairGenerator();
    ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(params, random);

    pGen.init(genParam);

    AsymmetricCipherKeyPair pair = pGen.generateKeyPair();

    ParametersWithRandom param = new ParametersWithRandom(pair.getPrivate(), random);

    ECGOST3410Signer ecgost3410 = new ECGOST3410Signer();

    ecgost3410.init(true, param);

    BigInteger[] sig = ecgost3410.generateSignature(hashmessage);

    ecgost3410.init(false, pair.getPublic());

    if (!ecgost3410.verifySignature(hashmessage, sig[0], sig[1])) {
      fail("signature fails");
    }
  }
  /**
   * Test Sign & Verify with C parameters see:
   * http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
   * gostR3410-2001-CryptoPro-C-ParamSet P.48
   */
  private void ecGOST3410_CParam() {
    SecureRandom random = new SecureRandom();

    BigInteger mod_p =
        new BigInteger(
            "70390085352083305199547718019018437841079516630045180471284346843705633502619"); // p

    ECCurve.Fp curve =
        new ECCurve.Fp(
            mod_p, // p
            new BigInteger(
                "70390085352083305199547718019018437841079516630045180471284346843705633502616"), // a
            new BigInteger("32858")); // b

    ECDomainParameters params =
        new ECDomainParameters(
            curve,
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(mod_p, new BigInteger("0")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "29818893917731240733471273240314769927240550812383695689146495261604565990247"))), // y
            new BigInteger(
                "70390085352083305199547718019018437840920882647164081035322601458352298396601")); // q

    ECKeyPairGenerator pGen = new ECKeyPairGenerator();
    ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(params, random);

    pGen.init(genParam);

    AsymmetricCipherKeyPair pair = pGen.generateKeyPair();

    ParametersWithRandom param = new ParametersWithRandom(pair.getPrivate(), random);

    ECGOST3410Signer ecgost3410 = new ECGOST3410Signer();

    ecgost3410.init(true, param);

    BigInteger[] sig = ecgost3410.generateSignature(hashmessage);

    ecgost3410.init(false, pair.getPublic());

    if (!ecgost3410.verifySignature(hashmessage, sig[0], sig[1])) {
      fail("signature fails");
    }
  }
  /**
   * Test Sign & Verify with A parameters see:
   * http://www.ietf.org/internet-drafts/draft-popov-cryptopro-cpalgs-01.txt
   * gostR3410-2001-CryptoPro-A-ParamSet P.47
   */
  public void ecGOST3410_AParam() {
    SecureRandom random = new SecureRandom();

    BigInteger mod_p =
        new BigInteger(
            "115792089237316195423570985008687907853269984665640564039457584007913129639319"); // p

    ECCurve.Fp curve =
        new ECCurve.Fp(
            mod_p, // p
            new BigInteger(
                "115792089237316195423570985008687907853269984665640564039457584007913129639316"), // a
            new BigInteger("166")); // b

    ECDomainParameters params =
        new ECDomainParameters(
            curve,
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(mod_p, new BigInteger("1")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "64033881142927202683649881450433473985931760268884941288852745803908878638612"))), // y
            new BigInteger(
                "115792089237316195423570985008687907853073762908499243225378155805079068850323")); // q

    ECKeyPairGenerator pGen = new ECKeyPairGenerator();
    ECKeyGenerationParameters genParam = new ECKeyGenerationParameters(params, random);

    pGen.init(genParam);

    AsymmetricCipherKeyPair pair = pGen.generateKeyPair();

    ParametersWithRandom param = new ParametersWithRandom(pair.getPrivate(), random);

    ECGOST3410Signer ecgost3410 = new ECGOST3410Signer();

    ecgost3410.init(true, param);

    BigInteger[] sig = ecgost3410.generateSignature(hashmessage);

    ecgost3410.init(false, pair.getPublic());

    if (!ecgost3410.verifySignature(hashmessage, sig[0], sig[1])) {
      fail("signature fails");
    }
  }
  private void ecGOST3410_TEST() {
    BigInteger mod_p =
        new BigInteger(
            "57896044618658097711785492504343953926634992332820282019728792003956564821041"); // p

    ECCurve.Fp curve =
        new ECCurve.Fp(
            mod_p, // p
            new BigInteger("7"), // a
            new BigInteger(
                "43308876546767276905765904595650931995942111794451039583252968842033849580414")); // b

    ECDomainParameters params =
        new ECDomainParameters(
            curve,
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(mod_p, new BigInteger("2")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "4018974056539037503335449422937059775635739389905545080690979365213431566280"))), // y
            new BigInteger(
                "57896044618658097711785492504343953927082934583725450622380973592137631069619")); // q

    ECPrivateKeyParameters priKey =
        new ECPrivateKeyParameters(
            new BigInteger(
                "55441196065363246126355624130324183196576709222340016572108097750006097525544"), // d
            params);

    ParametersWithRandom param = new ParametersWithRandom(priKey, k);

    ECGOST3410Signer ecgost3410 = new ECGOST3410Signer();

    ecgost3410.init(true, param);

    byte[] mVal =
        new BigInteger(
                "20798893674476452017134061561508270130637142515379653289952617252661468872421")
            .toByteArray();
    byte[] message = new byte[mVal.length];

    for (int i = 0; i != mVal.length; i++) {
      message[i] = mVal[mVal.length - 1 - i];
    }

    BigInteger[] sig = ecgost3410.generateSignature(message);

    if (!r.equals(sig[0])) {
      fail("r component wrong.", r, sig[0]);
    }

    if (!s.equals(sig[1])) {
      fail("s component wrong.", s, sig[1]);
    }

    // Verify the signature
    ECPublicKeyParameters pubKey =
        new ECPublicKeyParameters(
            new ECPoint.Fp(
                curve,
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "57520216126176808443631405023338071176630104906313632182896741342206604859403")), // x
                new ECFieldElement.Fp(
                    mod_p,
                    new BigInteger(
                        "17614944419213781543809391949654080031942662045363639260709847859438286763994"))), // y
            params);

    ecgost3410.init(false, pubKey);
    if (!ecgost3410.verifySignature(message, sig[0], sig[1])) {
      fail("verification fails");
    }
  }