Java 类org.bouncycastle.asn1.x9.X9ECParameters 实例源码

public static X9ECParameters getByName(
    String  name)
{
    ASN1ObjectIdentifier oid = (ASN1ObjectIdentifier)objIds.get(Strings.toUpperCase(name));

    if (oid != null)
    {
        return getByOID(oid);
    }

    return null;
}

/**
 * return a parameter spec representing the passed in named
 * curve. The routine returns null if the curve is not present.
 * 
 * @param name the name of the curve requested
 * @return a parameter spec for the curve, null if it is not available.
 */
public static ECNamedCurveParameterSpec getParameterSpec(
    String  name)
{
    X9ECParameters  ecP = X962NamedCurves.getByName(name);
    if (ecP == null)
    {
        return null;
    }

    return new ECNamedCurveParameterSpec(
                                    name,
                                    ecP.getCurve(),
                                    ecP.getG(),
                                    ecP.getN(),
                                    ecP.getH(),
                                    ecP.getSeed());

}

public static ECDomainParameters getParametersForNamedCurve(int namedCurve)
{
    String curveName = getNameOfNamedCurve(namedCurve);
    if (curveName == null)
    {
        return null;
    }

    // Lazily created the first time a particular curve is accessed
    X9ECParameters ecP = SECNamedCurves.getByName(curveName);

    if (ecP == null)
    {
        return null;
    }

    // It's a bit inefficient to do this conversion every time
    return new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
}

protected X9ECParameters createParameters()
{
    // p = (2^128 - 3) / 76439
    BigInteger p = fromHex("DB7C2ABF62E35E668076BEAD208B");
    BigInteger a = fromHex("DB7C2ABF62E35E668076BEAD2088");
    BigInteger b = fromHex("659EF8BA043916EEDE8911702B22");
    byte[] S = Hex.decode("00F50B028E4D696E676875615175290472783FB1");
    BigInteger n = fromHex("DB7C2ABF62E35E7628DFAC6561C5");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "09487239995A5EE76B55F9C2F098"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "09487239995A5EE76B55F9C2F098"
        + "A89CE5AF8724C0A23E0E0FF77500"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = (2^128 - 3) / 76439
    BigInteger p = fromHex("DB7C2ABF62E35E668076BEAD208B");
    BigInteger a = fromHex("6127C24C05F38A0AAAF65C0EF02C");
    BigInteger b = fromHex("51DEF1815DB5ED74FCC34C85D709");
    byte[] S = Hex.decode("002757A1114D696E6768756151755316C05E0BD4");
    BigInteger n = fromHex("36DF0AAFD8B8D7597CA10520D04B");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "4BA30AB5E892B4E1649DD0928643"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "4BA30AB5E892B4E1649DD0928643"
        + "ADCD46F5882E3747DEF36E956E97"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^128 - 2^97 - 1
    BigInteger p = fromHex("FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF");
    BigInteger a = fromHex("FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFC");
    BigInteger b = fromHex("E87579C11079F43DD824993C2CEE5ED3");
    byte[] S = Hex.decode("000E0D4D696E6768756151750CC03A4473D03679");
    BigInteger n = fromHex("FFFFFFFE0000000075A30D1B9038A115");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "161FF7528B899B2D0C28607CA52C5B86"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "161FF7528B899B2D0C28607CA52C5B86"
        + "CF5AC8395BAFEB13C02DA292DDED7A83"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^128 - 2^97 - 1
    BigInteger p = fromHex("FFFFFFFDFFFFFFFFFFFFFFFFFFFFFFFF");
    BigInteger a = fromHex("D6031998D1B3BBFEBF59CC9BBFF9AEE1");
    BigInteger b = fromHex("5EEEFCA380D02919DC2C6558BB6D8A5D");
    byte[] S = Hex.decode("004D696E67687561517512D8F03431FCE63B88F4");
    BigInteger n = fromHex("3FFFFFFF7FFFFFFFBE0024720613B5A3");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "7B6AA5D85E572983E6FB32A7CDEBC140"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "7B6AA5D85E572983E6FB32A7CDEBC140"
        + "27B6916A894D3AEE7106FE805FC34B44"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
        {
            // p = 2^160 - 2^32 - 2^14 - 2^12 - 2^9 - 2^8 - 2^7 - 2^3 - 2^2 - 1
            BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73");
            BigInteger a = ECConstants.ZERO;
            BigInteger b = BigInteger.valueOf(7);
            byte[] S = null;
            BigInteger n = fromHex("0100000000000000000001B8FA16DFAB9ACA16B6B3");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = new ECCurve.Fp(p, a, b);
//            ECPoint G = curve.decodePoint(Hex.decode("02"
//                + "3B4C382CE37AA192A4019E763036F4F5DD4D7EBB"));
            ECPoint G = curve.decodePoint(Hex.decode("04"
                + "3B4C382CE37AA192A4019E763036F4F5DD4D7EBB"
                + "938CF935318FDCED6BC28286531733C3F03C4FEE"));

            return new X9ECParameters(curve, G, n, h, S);
        }

protected X9ECParameters createParameters()
{
    // p = 2^160 - 2^31 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFF");
    BigInteger a = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF7FFFFFFC");
    BigInteger b = fromHex("1C97BEFC54BD7A8B65ACF89F81D4D4ADC565FA45");
    byte[] S = Hex.decode("1053CDE42C14D696E67687561517533BF3F83345");
    BigInteger n = fromHex("0100000000000000000001F4C8F927AED3CA752257");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
        //+ "4A96B5688EF573284664698968C38BB913CBFC82"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "4A96B5688EF573284664698968C38BB913CBFC82"
        + "23A628553168947D59DCC912042351377AC5FB32"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^160 - 2^32 - 2^14 - 2^12 - 2^9 - 2^8 - 2^7 - 2^3 - 2^2 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC73");
    BigInteger a = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFAC70");
    BigInteger b = fromHex("B4E134D3FB59EB8BAB57274904664D5AF50388BA");
    byte[] S = Hex.decode("B99B99B099B323E02709A4D696E6768756151751");
    BigInteger n = fromHex("0100000000000000000000351EE786A818F3A1A16B");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "52DCB034293A117E1F4FF11B30F7199D3144CE6D"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "52DCB034293A117E1F4FF11B30F7199D3144CE6D"
        + "FEAFFEF2E331F296E071FA0DF9982CFEA7D43F2E"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^192 - 2^32 - 2^12 - 2^8 - 2^7 - 2^6 - 2^3 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFEE37");
    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(3);
    byte[] S = null;
    BigInteger n = fromHex("FFFFFFFFFFFFFFFFFFFFFFFE26F2FC170F69466A74DEFD8D");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "DB4FF10EC057E9AE26B07D0280B7F4341DA5D1B1EAE06C7D"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "DB4FF10EC057E9AE26B07D0280B7F4341DA5D1B1EAE06C7D"
        + "9B2F2F6D9C5628A7844163D015BE86344082AA88D95E2F9D"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^192 - 2^64 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF");
    BigInteger a = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFC");
    BigInteger b = fromHex("64210519E59C80E70FA7E9AB72243049FEB8DEECC146B9B1");
    byte[] S = Hex.decode("3045AE6FC8422F64ED579528D38120EAE12196D5");
    BigInteger n = fromHex("FFFFFFFFFFFFFFFFFFFFFFFF99DEF836146BC9B1B4D22831");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "188DA80EB03090F67CBF20EB43A18800F4FF0AFD82FF1012"
        + "07192B95FFC8DA78631011ED6B24CDD573F977A11E794811"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^224 - 2^32 - 2^12 - 2^11 - 2^9 - 2^7 - 2^4 - 2 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFE56D");
    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(5);
    byte[] S = null;
    BigInteger n = fromHex("010000000000000000000000000001DCE8D2EC6184CAF0A971769FB1F7");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "A1455B334DF099DF30FC28A169A467E9E47075A90F7E650EB6B7A45C"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "A1455B334DF099DF30FC28A169A467E9E47075A90F7E650EB6B7A45C"
        + "7E089FED7FBA344282CAFBD6F7E319F7C0B0BD59E2CA4BDB556D61A5"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^224 - 2^96 + 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF000000000000000000000001");
    BigInteger a = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFE");
    BigInteger b = fromHex("B4050A850C04B3ABF54132565044B0B7D7BFD8BA270B39432355FFB4");
    byte[] S = Hex.decode("BD71344799D5C7FCDC45B59FA3B9AB8F6A948BC5");
    BigInteger n = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFF16A2E0B8F03E13DD29455C5C2A3D");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "B70E0CBD6BB4BF7F321390B94A03C1D356C21122343280D6115C1D21"
        + "BD376388B5F723FB4C22DFE6CD4375A05A07476444D5819985007E34"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^256 - 2^32 - 2^9 - 2^8 - 2^7 - 2^6 - 2^4 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFC2F");
    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(7);
    byte[] S = null;
    BigInteger n = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364141");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798"
        + "483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^224 (2^32 - 1) + 2^192 + 2^96 - 1
    BigInteger p = fromHex("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFF");
    BigInteger a = fromHex("FFFFFFFF00000001000000000000000000000000FFFFFFFFFFFFFFFFFFFFFFFC");
    BigInteger b = fromHex("5AC635D8AA3A93E7B3EBBD55769886BC651D06B0CC53B0F63BCE3C3E27D2604B");
    byte[] S = Hex.decode("C49D360886E704936A6678E1139D26B7819F7E90");
    BigInteger n = fromHex("FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "6B17D1F2E12C4247F8BCE6E563A440F277037D812DEB33A0F4A13945D898C296"
        + "4FE342E2FE1A7F9B8EE7EB4A7C0F9E162BCE33576B315ECECBB6406837BF51F5"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^384 - 2^128 - 2^96 + 2^32 - 1
    BigInteger p = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFF");
    BigInteger a = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFF0000000000000000FFFFFFFC");
    BigInteger b = fromHex("B3312FA7E23EE7E4988E056BE3F82D19181D9C6EFE8141120314088F5013875AC656398D8A2ED19D2A85C8EDD3EC2AEF");
    byte[] S = Hex.decode("A335926AA319A27A1D00896A6773A4827ACDAC73");
    BigInteger n = fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC7634D81F4372DDF581A0DB248B0A77AECEC196ACCC52973");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B9859F741E082542A385502F25DBF55296C3A545E3872760AB7"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "AA87CA22BE8B05378EB1C71EF320AD746E1D3B628BA79B9859F741E082542A385502F25DBF55296C3A545E3872760AB7"
        + "3617DE4A96262C6F5D9E98BF9292DC29F8F41DBD289A147CE9DA3113B5F0B8C00A60B1CE1D7E819D7A431D7C90EA0E5F"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    // p = 2^521 - 1
    BigInteger p = fromHex("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF");
    BigInteger a = fromHex("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFC");
    BigInteger b = fromHex("0051953EB9618E1C9A1F929A21A0B68540EEA2DA725B99B315F3B8B489918EF109E156193951EC7E937B1652C0BD3BB1BF073573DF883D2C34F1EF451FD46B503F00");
    byte[] S = Hex.decode("D09E8800291CB85396CC6717393284AAA0DA64BA");
    BigInteger n = fromHex("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386409");
    BigInteger h = BigInteger.valueOf(1);

    ECCurve curve = new ECCurve.Fp(p, a, b);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "00C6858E06B70404E9CD9E3ECB662395B4429C648139053FB521F828AF606B4D3DBAA14B5E77EFE75928FE1DC127A2FFA8DE3348B3C1856A429BF97E7E31C2E5BD66"
        + "011839296A789A3BC0045C8A5FB42C7D1BD998F54449579B446817AFBD17273E662C97EE72995EF42640C550B9013FAD0761353C7086A272C24088BE94769FD16650"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 113;
    int k = 9;

    BigInteger a = fromHex("003088250CA6E7C7FE649CE85820F7");
    BigInteger b = fromHex("00E8BEE4D3E2260744188BE0E9C723");
    byte[] S = Hex.decode("10E723AB14D696E6768756151756FEBF8FCB49A9");
    BigInteger n = fromHex("0100000000000000D9CCEC8A39E56F");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "009D73616F35F4AB1407D73562C10F"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "009D73616F35F4AB1407D73562C10F"
        + "00A52830277958EE84D1315ED31886"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 113;
    int k = 9;

    BigInteger a = fromHex("00689918DBEC7E5A0DD6DFC0AA55C7");
    BigInteger b = fromHex("0095E9A9EC9B297BD4BF36E059184F");
    byte[] S = Hex.decode("10C0FB15760860DEF1EEF4D696E676875615175D");
    BigInteger n = fromHex("010000000000000108789B2496AF93");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "01A57A6A7B26CA5EF52FCDB8164797"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "01A57A6A7B26CA5EF52FCDB8164797"
        + "00B3ADC94ED1FE674C06E695BABA1D"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 131;
    int k1 = 2;
    int k2 = 3;
    int k3 = 8;

    BigInteger a = fromHex("07A11B09A76B562144418FF3FF8C2570B8");
    BigInteger b = fromHex("0217C05610884B63B9C6C7291678F9D341");
    byte[] S = Hex.decode("4D696E676875615175985BD3ADBADA21B43A97E2");
    BigInteger n = fromHex("0400000000000000023123953A9464B54D");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "0081BAF91FDF9833C40F9C181343638399"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0081BAF91FDF9833C40F9C181343638399"
        + "078C6E7EA38C001F73C8134B1B4EF9E150"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 131;
    int k1 = 2;
    int k2 = 3;
    int k3 = 8;

    BigInteger a = fromHex("03E5A88919D7CAFCBF415F07C2176573B2");
    BigInteger b = fromHex("04B8266A46C55657AC734CE38F018F2192");
    byte[] S = Hex.decode("985BD3ADBAD4D696E676875615175A21B43A97E3");
    BigInteger n = fromHex("0400000000000000016954A233049BA98F");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "0356DCD8F2F95031AD652D23951BB366A8"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0356DCD8F2F95031AD652D23951BB366A8"
        + "0648F06D867940A5366D9E265DE9EB240F"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 163;
    int k1 = 3;
    int k2 = 6;
    int k3 = 7;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("04000000000000000000020108A2E0CC0D99F8A5EF");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "02FE13C0537BBC11ACAA07D793DE4E6D5E5C94EEE8"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "02FE13C0537BBC11ACAA07D793DE4E6D5E5C94EEE8"
        + "0289070FB05D38FF58321F2E800536D538CCDAA3D9"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 163;
    int k1 = 3;
    int k2 = 6;
    int k3 = 7;

    BigInteger a = fromHex("07B6882CAAEFA84F9554FF8428BD88E246D2782AE2");
    BigInteger b = fromHex("0713612DCDDCB40AAB946BDA29CA91F73AF958AFD9");
    byte[] S = Hex.decode("24B7B137C8A14D696E6768756151756FD0DA2E5C");
    BigInteger n = fromHex("03FFFFFFFFFFFFFFFFFFFF48AAB689C29CA710279B");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "0369979697AB43897789566789567F787A7876A654"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0369979697AB43897789566789567F787A7876A654"
        + "00435EDB42EFAFB2989D51FEFCE3C80988F41FF883"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 163;
    int k1 = 3;
    int k2 = 6;
    int k3 = 7;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = fromHex("020A601907B8C953CA1481EB10512F78744A3205FD");
    byte[] S = Hex.decode("85E25BFE5C86226CDB12016F7553F9D0E693A268");
    BigInteger n = fromHex("040000000000000000000292FE77E70C12A4234C33");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "03F0EBA16286A2D57EA0991168D4994637E8343E36"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "03F0EBA16286A2D57EA0991168D4994637E8343E36"
        + "00D51FBC6C71A0094FA2CDD545B11C5C0C797324F1"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 193;
    int k = 15;

    BigInteger a = fromHex("0017858FEB7A98975169E171F77B4087DE098AC8A911DF7B01");
    BigInteger b = fromHex("00FDFB49BFE6C3A89FACADAA7A1E5BBC7CC1C2E5D831478814");
    byte[] S = Hex.decode("103FAEC74D696E676875615175777FC5B191EF30");
    BigInteger n = fromHex("01000000000000000000000000C7F34A778F443ACC920EBA49");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "01F481BC5F0FF84A74AD6CDF6FDEF4BF6179625372D8C0C5E1"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "01F481BC5F0FF84A74AD6CDF6FDEF4BF6179625372D8C0C5E1"
        + "0025E399F2903712CCF3EA9E3A1AD17FB0B3201B6AF7CE1B05"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 193;
    int k = 15;

    BigInteger a = fromHex("0163F35A5137C2CE3EA6ED8667190B0BC43ECD69977702709B");
    BigInteger b = fromHex("00C9BB9E8927D4D64C377E2AB2856A5B16E3EFB7F61D4316AE");
    byte[] S = Hex.decode("10B7B4D696E676875615175137C8A16FD0DA2211");
    BigInteger n = fromHex("010000000000000000000000015AAB561B005413CCD4EE99D5");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "00D9B67D192E0367C803F39E1A7E82CA14A651350AAE617E8F"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "00D9B67D192E0367C803F39E1A7E82CA14A651350AAE617E8F"
        + "01CE94335607C304AC29E7DEFBD9CA01F596F927224CDECF6C"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 233;
    int k = 74;

    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("8000000000000000000000000000069D5BB915BCD46EFB1AD5F173ABDF");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "017232BA853A7E731AF129F22FF4149563A419C26BF50A4C9D6EEFAD6126"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "017232BA853A7E731AF129F22FF4149563A419C26BF50A4C9D6EEFAD6126"
        + "01DB537DECE819B7F70F555A67C427A8CD9BF18AEB9B56E0C11056FAE6A3"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 233;
    int k = 74;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = fromHex("0066647EDE6C332C7F8C0923BB58213B333B20E9CE4281FE115F7D8F90AD");
    byte[] S = Hex.decode("74D59FF07F6B413D0EA14B344B20A2DB049B50C3");
    BigInteger n = fromHex("01000000000000000000000000000013E974E72F8A6922031D2603CFE0D7");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "00FAC9DFCBAC8313BB2139F1BB755FEF65BC391F8B36F8F8EB7371FD558B"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "00FAC9DFCBAC8313BB2139F1BB755FEF65BC391F8B36F8F8EB7371FD558B"
        + "01006A08A41903350678E58528BEBF8A0BEFF867A7CA36716F7E01F81052"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 239;
    int k = 158;

    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("2000000000000000000000000000005A79FEC67CB6E91F1C1DA800E478A5");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "29A0B6A887A983E9730988A68727A8B2D126C44CC2CC7B2A6555193035DC"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "29A0B6A887A983E9730988A68727A8B2D126C44CC2CC7B2A6555193035DC"
        + "76310804F12E549BDB011C103089E73510ACB275FC312A5DC6B76553F0CA"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 283;
    int k1 = 5;
    int k2 = 7;
    int k3 = 12;

    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("01FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE9AE2ED07577265DFF7F94451E061E163C61");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "0503213F78CA44883F1A3B8162F188E553CD265F23C1567A16876913B0C2AC2458492836"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0503213F78CA44883F1A3B8162F188E553CD265F23C1567A16876913B0C2AC2458492836"
        + "01CCDA380F1C9E318D90F95D07E5426FE87E45C0E8184698E45962364E34116177DD2259"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 283;
    int k1 = 5;
    int k2 = 7;
    int k3 = 12;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = fromHex("027B680AC8B8596DA5A4AF8A19A0303FCA97FD7645309FA2A581485AF6263E313B79A2F5");
    byte[] S = Hex.decode("77E2B07370EB0F832A6DD5B62DFC88CD06BB84BE");
    BigInteger n = fromHex("03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEF90399660FC938A90165B042A7CEFADB307");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "05F939258DB7DD90E1934F8C70B0DFEC2EED25B8557EAC9C80E2E198F8CDBECD86B12053"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "05F939258DB7DD90E1934F8C70B0DFEC2EED25B8557EAC9C80E2E198F8CDBECD86B12053"
        + "03676854FE24141CB98FE6D4B20D02B4516FF702350EDDB0826779C813F0DF45BE8112F4"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 409;
    int k = 87;

    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("7FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE5F83B2D4EA20400EC4557D5ED3E3E7CA5B4B5C83B8E01E5FCF");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "0060F05F658F49C1AD3AB1890F7184210EFD0987E307C84C27ACCFB8F9F67CC2C460189EB5AAAA62EE222EB1B35540CFE9023746"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0060F05F658F49C1AD3AB1890F7184210EFD0987E307C84C27ACCFB8F9F67CC2C460189EB5AAAA62EE222EB1B35540CFE9023746"
        + "01E369050B7C4E42ACBA1DACBF04299C3460782F918EA427E6325165E9EA10E3DA5F6C42E9C55215AA9CA27A5863EC48D8E0286B"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 409;
    int k = 87;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = fromHex("0021A5C2C8EE9FEB5C4B9A753B7B476B7FD6422EF1F3DD674761FA99D6AC27C8A9A197B272822F6CD57A55AA4F50AE317B13545F");
    byte[] S = Hex.decode("4099B5A457F9D69F79213D094C4BCD4D4262210B");
    BigInteger n = fromHex("010000000000000000000000000000000000000000000000000001E2AAD6A612F33307BE5FA47C3C9E052F838164CD37D9A21173");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "015D4860D088DDB3496B0C6064756260441CDE4AF1771D4DB01FFE5B34E59703DC255A868A1180515603AEAB60794E54BB7996A7"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "015D4860D088DDB3496B0C6064756260441CDE4AF1771D4DB01FFE5B34E59703DC255A868A1180515603AEAB60794E54BB7996A7"
        + "0061B1CFAB6BE5F32BBFA78324ED106A7636B9C5A7BD198D0158AA4F5488D08F38514F1FDF4B4F40D2181B3681C364BA0273C706"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 571;
    int k1 = 2;
    int k2 = 5;
    int k3 = 10;

    BigInteger a = ECConstants.ZERO;
    BigInteger b = BigInteger.valueOf(1);
    byte[] S = null;
    BigInteger n = fromHex("020000000000000000000000000000000000000000000000000000000000000000000000131850E1F19A63E4B391A8DB917F4138B630D84BE5D639381E91DEB45CFE778F637C1001");
    BigInteger h = BigInteger.valueOf(4);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("02"
    //+ "026EB7A859923FBC82189631F8103FE4AC9CA2970012D5D46024804801841CA44370958493B205E647DA304DB4CEB08CBBD1BA39494776FB988B47174DCA88C7E2945283A01C8972"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "026EB7A859923FBC82189631F8103FE4AC9CA2970012D5D46024804801841CA44370958493B205E647DA304DB4CEB08CBBD1BA39494776FB988B47174DCA88C7E2945283A01C8972"
        + "0349DC807F4FBF374F4AEADE3BCA95314DD58CEC9F307A54FFC61EFC006D8A2C9D4979C0AC44AEA74FBEBBB9F772AEDCB620B01A7BA7AF1B320430C8591984F601CD4C143EF1C7A3"));

    return new X9ECParameters(curve, G, n, h, S);
}

protected X9ECParameters createParameters()
{
    int m = 571;
    int k1 = 2;
    int k2 = 5;
    int k3 = 10;

    BigInteger a = BigInteger.valueOf(1);
    BigInteger b = fromHex("02F40E7E2221F295DE297117B7F3D62F5C6A97FFCB8CEFF1CD6BA8CE4A9A18AD84FFABBD8EFA59332BE7AD6756A66E294AFD185A78FF12AA520E4DE739BACA0C7FFEFF7F2955727A");
    byte[] S = Hex.decode("2AA058F73A0E33AB486B0F610410C53A7F132310");
    BigInteger n = fromHex("03FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFE661CE18FF55987308059B186823851EC7DD9CA1161DE93D5174D66E8382E9BB2FE84E47");
    BigInteger h = BigInteger.valueOf(2);

    ECCurve curve = new ECCurve.F2m(m, k1, k2, k3, a, b, n, h);
    //ECPoint G = curve.decodePoint(Hex.decode("03"
    //+ "0303001D34B856296C16C0D40D3CD7750A93D1D2955FA80AA5F40FC8DB7B2ABDBDE53950F4C0D293CDD711A35B67FB1499AE60038614F1394ABFA3B4C850D927E1E7769C8EEC2D19"));
    ECPoint G = curve.decodePoint(Hex.decode("04"
        + "0303001D34B856296C16C0D40D3CD7750A93D1D2955FA80AA5F40FC8DB7B2ABDBDE53950F4C0D293CDD711A35B67FB1499AE60038614F1394ABFA3B4C850D927E1E7769C8EEC2D19"
        + "037BF27342DA639B6DCCFFFEB73D69D78C6C27A6009CBBCA1980F8533921E8A684423E43BAB08A576291AF8F461BB2A8B3531D2F0485C19B16E2F1516E23DD3C1A4827AF1B8AC15B"));

    return new X9ECParameters(curve, G, n, h, S);
}

public static X9ECParameters getNamedCurveByOid(
    ASN1ObjectIdentifier oid)
{
    X9ECParameters params = X962NamedCurves.getByOID(oid);

    if (params == null)
    {
        params = SECNamedCurves.getByOID(oid);
        if (params == null)
        {
            params = NISTNamedCurves.getByOID(oid);
        }
        if (params == null)
        {
            params = TeleTrusTNamedCurves.getByOID(oid);
        }
    }

    return params;
}

public static byte[] getSM2Z(byte[] userID, ASN1ObjectIdentifier curveOid,
        BigInteger pubPointX, BigInteger pubPointY) {
    SM3Digest digest = new SM3Digest();

    addUserID(digest, userID);

    X9ECParameters ecParams = GMNamedCurves.getByOID(curveOid);
    addFieldElement(digest, ecParams.getCurve().getA());
    addFieldElement(digest, ecParams.getCurve().getB());
    addFieldElement(digest, ecParams.getG().getAffineXCoord());
    addFieldElement(digest, ecParams.getG().getAffineYCoord());

    int fieldSize = (ecParams.getCurve().getFieldSize() + 7) / 8;
    byte[] bytes = BigIntegers.asUnsignedByteArray(fieldSize, pubPointX);
    digest.update(bytes, 0, fieldSize);

    bytes = BigIntegers.asUnsignedByteArray(fieldSize, pubPointY);
    digest.update(bytes, 0, fieldSize);

    byte[] result = new byte[digest.getDigestSize()];
    digest.doFinal(result, 0);
    return result;
}

@Test
public void testExportImport() throws GeneralSecurityException {

    // Create a curve25519 parameter spec
    X9ECParameters params = CustomNamedCurves.getByName("curve25519");
    ECParameterSpec ecParameterSpec = new ECParameterSpec(params.getCurve(), params.getG(), params.getN(), params.getH(), params.getSeed());

    // Create public key
    KeyAgreementPeer peer = new ECDHPeer(ecParameterSpec, null, "BC");
    ECPublicKey ecPublicKey = (ECPublicKey) peer.getPublicKey();

    // Export public key
    byte[] encoded = ecPublicKey.getQ().getEncoded(true);

    System.out.println(Arrays.toString(encoded));
    System.out.println("Encoded length: " + encoded.length);

    // Import public key
    ECPublicKey importedECPublicKey = loadPublicKey(encoded);

    Assert.assertArrayEquals(ecPublicKey.getEncoded(), importedECPublicKey.getEncoded());
}

public static ECDomainParameters getParametersForNamedCurve(int namedCurve)
{
    String curveName = getNameOfNamedCurve(namedCurve);
    if (curveName == null)
    {
        return null;
    }

    // Parameters are lazily created the first time a particular curve is accessed

    X9ECParameters ecP = CustomNamedCurves.getByName(curveName);
    if (ecP == null)
    {
        ecP = ECNamedCurveTable.getByName(curveName);
        if (ecP == null)
        {
            return null;
        }
    }

    // It's a bit inefficient to do this conversion every time
    return new ECDomainParameters(ecP.getCurve(), ecP.getG(), ecP.getN(), ecP.getH(), ecP.getSeed());
}