org.bouncycastle.asn1.x9.X962NamedCurves Maven / Gradle / Ivy

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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 and up.
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package org.bouncycastle.asn1.x9;

import java.math.BigInteger;
import java.util.Enumeration;
import java.util.Hashtable;

import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.math.ec.ECCurve;
import org.bouncycastle.math.ec.WNafUtil;
import org.bouncycastle.util.Strings;
import org.bouncycastle.util.encoders.Hex;


/**
 * Table of the current named curves defined in X.962 EC-DSA.
 */
public class X962NamedCurves
{
    private static X9ECPoint configureBasepoint(ECCurve curve, String encoding)
    {
        X9ECPoint G = new X9ECPoint(curve, Hex.decodeStrict(encoding));
        WNafUtil.configureBasepoint(G.getPoint());
        return G;
    }

    private static ECCurve configureCurve(ECCurve curve)
    {
        return curve;
    }

    private static BigInteger fromHex(String hex)
    {
        return new BigInteger(1, Hex.decodeStrict(hex));
    }

    static X9ECParametersHolder prime192v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("ffffffffffffffffffffffff99def836146bc9b1b4d22831");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"),
                fromHex("fffffffffffffffffffffffffffffffefffffffffffffffc"),
                fromHex("64210519e59c80e70fa7e9ab72243049feb8deecc146b9b1"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "03188da80eb03090f67cbf20eb43a18800f4ff0afd82ff1012");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("3045AE6FC8422f64ED579528D38120EAE12196D5"));
        }
    };

    static X9ECParametersHolder prime192v2 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("fffffffffffffffffffffffe5fb1a724dc80418648d8dd31");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"),
                fromHex("fffffffffffffffffffffffffffffffefffffffffffffffc"),
                fromHex("cc22d6dfb95c6b25e49c0d6364a4e5980c393aa21668d953"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "03eea2bae7e1497842f2de7769cfe9c989c072ad696f48034a");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("31a92ee2029fd10d901b113e990710f0d21ac6b6"));
        }
    };

    static X9ECParametersHolder prime192v3 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("ffffffffffffffffffffffff7a62d031c83f4294f640ec13");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                fromHex("FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEFFFFFFFFFFFFFFFF"),
                fromHex("fffffffffffffffffffffffffffffffefffffffffffffffc"),
                fromHex("22123dc2395a05caa7423daeccc94760a7d462256bd56916"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "027d29778100c65a1da1783716588dce2b8b4aee8e228f1896");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("c469684435deb378c4b65ca9591e2a5763059a2e"));
        }
    };

    static X9ECParametersHolder prime239v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("7fffffffffffffffffffffff7fffff9e5e9a9f5d9071fbd1522688909d0b");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"),
                fromHex("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc"),
                fromHex("6b016c3bdcf18941d0d654921475ca71a9db2fb27d1d37796185c2942c0a"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "020ffa963cdca8816ccc33b8642bedf905c3d358573d3f27fbbd3b3cb9aaaf");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("e43bb460f0b80cc0c0b075798e948060f8321b7d"));
        }
    };

    static X9ECParametersHolder prime239v2 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("7fffffffffffffffffffffff800000cfa7e8594377d414c03821bc582063");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"),
                fromHex("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc"),
                fromHex("617fab6832576cbbfed50d99f0249c3fee58b94ba0038c7ae84c8c832f2c"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0238af09d98727705120c921bb5e9e26296a3cdcf2f35757a0eafd87b830e7");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("e8b4011604095303ca3b8099982be09fcb9ae616"));
        }
    };

    static X9ECParametersHolder prime239v3 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("7fffffffffffffffffffffff7fffff975deb41b3a6057c3c432146526551");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                new BigInteger("883423532389192164791648750360308885314476597252960362792450860609699839"),
                fromHex("7fffffffffffffffffffffff7fffffffffff8000000000007ffffffffffc"),
                fromHex("255705fa2a306654b1f4cb03d6a750a30c250102d4988717d9ba15ab6d3e"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "036768ae8e18bb92cfcf005c949aa2c6d94853d0e660bbf854b1c9505fe95a");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("7d7374168ffe3471b60a857686a19475d3bfa2ff"));
        }
    };

    static X9ECParametersHolder prime256v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("ffffffff00000000ffffffffffffffffbce6faada7179e84f3b9cac2fc632551");
            BigInteger h = BigInteger.valueOf(1);

            ECCurve curve = configureCurve(new ECCurve.Fp(
                new BigInteger("115792089210356248762697446949407573530086143415290314195533631308867097853951"),
                fromHex("ffffffff00000001000000000000000000000000fffffffffffffffffffffffc"),
                fromHex("5ac635d8aa3a93e7b3ebbd55769886bc651d06b0cc53b0f63bce3c3e27d2604b"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "036b17d1f2e12c4247f8bce6e563a440f277037d812deb33a0f4a13945d898c296");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("c49d360886e704936a6678e1139d26b7819f7e90"));
        }
    };

    /*
     * F2m Curves
     */
    static X9ECParametersHolder c2pnb163v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0400000000000000000001E60FC8821CC74DAEAFC1");
            BigInteger h = BigInteger.valueOf(2);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                163,
                1, 2, 8,
                fromHex("072546B5435234A422E0789675F432C89435DE5242"),
                fromHex("00C9517D06D5240D3CFF38C74B20B6CD4D6F9DD4D9"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0307AF69989546103D79329FCC3D74880F33BBE803CB");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("D2C0FB15760860DEF1EEF4D696E6768756151754"));
        }
    };

    static X9ECParametersHolder c2pnb163v2 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("03FFFFFFFFFFFFFFFFFFFDF64DE1151ADBB78F10A7");
            BigInteger h = BigInteger.valueOf(2);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                163,
                1, 2, 8,
                fromHex("0108B39E77C4B108BED981ED0E890E117C511CF072"),
                fromHex("0667ACEB38AF4E488C407433FFAE4F1C811638DF20"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "030024266E4EB5106D0A964D92C4860E2671DB9B6CC5");

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

    static X9ECParametersHolder c2pnb163v3 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("03FFFFFFFFFFFFFFFFFFFE1AEE140F110AFF961309");
            BigInteger h = BigInteger.valueOf(2);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                163,
                1, 2, 8,
                fromHex("07A526C63D3E25A256A007699F5447E32AE456B50E"),
                fromHex("03F7061798EB99E238FD6F1BF95B48FEEB4854252B"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0202F9F87B7C574D0BDECF8A22E6524775F98CDEBDCB");

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

    static X9ECParametersHolder c2pnb176w1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("010092537397ECA4F6145799D62B0A19CE06FE26AD");
            BigInteger h = BigInteger.valueOf(0xFF6E);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                176,
                1, 2, 43,
                fromHex("E4E6DB2995065C407D9D39B8D0967B96704BA8E9C90B"),
                fromHex("5DDA470ABE6414DE8EC133AE28E9BBD7FCEC0AE0FFF2"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "038D16C2866798B600F9F08BB4A8E860F3298CE04A5798");

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

    static X9ECParametersHolder c2tnb191v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("40000000000000000000000004A20E90C39067C893BBB9A5");
            BigInteger h = BigInteger.valueOf(2);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                191,
                9,
                fromHex("2866537B676752636A68F56554E12640276B649EF7526267"),
                fromHex("2E45EF571F00786F67B0081B9495A3D95462F5DE0AA185EC"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0236B3DAF8A23206F9C4F299D7B21A9C369137F2C84AE1AA0D");

            return new X9ECParameters(curve, G, n, h, Hex.decodeStrict("4E13CA542744D696E67687561517552F279A8C84"));
        }
    };

    static X9ECParametersHolder c2tnb191v2 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("20000000000000000000000050508CB89F652824E06B8173");
            BigInteger h = BigInteger.valueOf(4);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                191,
                9,
                fromHex("401028774D7777C7B7666D1366EA432071274F89FF01E718"),
                fromHex("0620048D28BCBD03B6249C99182B7C8CD19700C362C46A01"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "023809B2B7CC1B28CC5A87926AAD83FD28789E81E2C9E3BF10");

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

    static X9ECParametersHolder c2tnb191v3 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("155555555555555555555555610C0B196812BFB6288A3EA3");
            BigInteger h = BigInteger.valueOf(6);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                191,
                9,
                fromHex("6C01074756099122221056911C77D77E77A777E7E7E77FCB"),
                fromHex("71FE1AF926CF847989EFEF8DB459F66394D90F32AD3F15E8"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "03375D4CE24FDE434489DE8746E71786015009E66E38A926DD");

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

    static X9ECParametersHolder c2pnb208w1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0101BAF95C9723C57B6C21DA2EFF2D5ED588BDD5717E212F9D");
            BigInteger h = BigInteger.valueOf(0xFE48);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                208,
                1, 2, 83,
                BigInteger.valueOf(0),
                fromHex("C8619ED45A62E6212E1160349E2BFA844439FAFC2A3FD1638F9E"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0289FDFBE4ABE193DF9559ECF07AC0CE78554E2784EB8C1ED1A57A");

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

    static X9ECParametersHolder c2tnb239v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("2000000000000000000000000000000F4D42FFE1492A4993F1CAD666E447");
            BigInteger h = BigInteger.valueOf(4);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                239,
                36,
                fromHex("32010857077C5431123A46B808906756F543423E8D27877578125778AC76"),
                fromHex("790408F2EEDAF392B012EDEFB3392F30F4327C0CA3F31FC383C422AA8C16"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0257927098FA932E7C0A96D3FD5B706EF7E5F5C156E16B7E7C86038552E91D");

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

    static X9ECParametersHolder c2tnb239v2 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("1555555555555555555555555555553C6F2885259C31E3FCDF154624522D");
            BigInteger h = BigInteger.valueOf(6);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                239,
                36,
                fromHex("4230017757A767FAE42398569B746325D45313AF0766266479B75654E65F"),
                fromHex("5037EA654196CFF0CD82B2C14A2FCF2E3FF8775285B545722F03EACDB74B"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0228F9D04E900069C8DC47A08534FE76D2B900B7D7EF31F5709F200C4CA205");

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

    static X9ECParametersHolder c2tnb239v3 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0CCCCCCCCCCCCCCCCCCCCCCCCCCCCCAC4912D2D9DF903EF9888B8A0E4CFF");
            BigInteger h = BigInteger.valueOf(10);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                239,
                36,
                fromHex("01238774666A67766D6676F778E676B66999176666E687666D8766C66A9F"),
                fromHex("6A941977BA9F6A435199ACFC51067ED587F519C5ECB541B8E44111DE1D40"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "0370F6E9D04D289C4E89913CE3530BFDE903977D42B146D539BF1BDE4E9C92");

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

    static X9ECParametersHolder c2pnb272w1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0100FAF51354E0E39E4892DF6E319C72C8161603FA45AA7B998A167B8F1E629521");
            BigInteger h = BigInteger.valueOf(0xFF06);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                272,
                1, 3, 56,
                fromHex("91A091F03B5FBA4AB2CCF49C4EDD220FB028712D42BE752B2C40094DBACDB586FB20"),
                fromHex("7167EFC92BB2E3CE7C8AAAFF34E12A9C557003D7C73A6FAF003F99F6CC8482E540F7"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "026108BABB2CEEBCF787058A056CBE0CFE622D7723A289E08A07AE13EF0D10D171DD8D");

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

    static X9ECParametersHolder c2pnb304w1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0101D556572AABAC800101D556572AABAC8001022D5C91DD173F8FB561DA6899164443051D");
            BigInteger h = BigInteger.valueOf(0xFE2E);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                304,
                1, 2, 11,
                fromHex("FD0D693149A118F651E6DCE6802085377E5F882D1B510B44160074C1288078365A0396C8E681"),
                fromHex("BDDB97E555A50A908E43B01C798EA5DAA6788F1EA2794EFCF57166B8C14039601E55827340BE"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "02197B07845E9BE2D96ADB0F5F3C7F2CFFBD7A3EB8B6FEC35C7FD67F26DDF6285A644F740A2614");

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

    static X9ECParametersHolder c2tnb359v1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("01AF286BCA1AF286BCA1AF286BCA1AF286BCA1AF286BC9FB8F6B85C556892C20A7EB964FE7719E74F490758D3B");
            BigInteger h = BigInteger.valueOf(0x4C);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                359,
                68,
                fromHex("5667676A654B20754F356EA92017D946567C46675556F19556A04616B567D223A5E05656FB549016A96656A557"),
                fromHex("2472E2D0197C49363F1FE7F5B6DB075D52B6947D135D8CA445805D39BC345626089687742B6329E70680231988"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "033C258EF3047767E7EDE0F1FDAA79DAEE3841366A132E163ACED4ED2401DF9C6BDCDE98E8E707C07A2239B1B097");

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

    static X9ECParametersHolder c2pnb368w1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("010090512DA9AF72B08349D98A5DD4C7B0532ECA51CE03E2D10F3B7AC579BD87E909AE40A6F131E9CFCE5BD967");
            BigInteger h = BigInteger.valueOf(0xFF70);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                368,
                1, 2, 85,
                fromHex("E0D2EE25095206F5E2A4F9ED229F1F256E79A0E2B455970D8D0D865BD94778C576D62F0AB7519CCD2A1A906AE30D"),
                fromHex("FC1217D4320A90452C760A58EDCD30C8DD069B3C34453837A34ED50CB54917E1C2112D84D164F444F8F74786046A"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "021085E2755381DCCCE3C1557AFA10C2F0C0C2825646C5B34A394CBCFA8BC16B22E7E789E927BE216F02E1FB136A5F");

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

    static X9ECParametersHolder c2tnb431r1 = new X9ECParametersHolder()
    {
        protected X9ECParameters createParameters()
        {
            BigInteger n = fromHex("0340340340340340340340340340340340340340340340340340340323C313FAB50589703B5EC68D3587FEC60D161CC149C1AD4A91");
            BigInteger h = BigInteger.valueOf(0x2760);

            ECCurve curve = configureCurve(new ECCurve.F2m(
                431,
                120,
                fromHex("1A827EF00DD6FC0E234CAF046C6A5D8A85395B236CC4AD2CF32A0CADBDC9DDF620B0EB9906D0957F6C6FEACD615468DF104DE296CD8F"),
                fromHex("10D9B4A3D9047D8B154359ABFB1B7F5485B04CEB868237DDC9DEDA982A679A5A919B626D4E50A8DD731B107A9962381FB5D807BF2618"),
                n, h));

            X9ECPoint G = configureBasepoint(curve,
                "02120FC05D3C67A99DE161D2F4092622FECA701BE4F50F4758714E8A87BBF2A658EF8C21E7C5EFE965361F6C2999C0C247B0DBD70CE6B7");

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


    static final Hashtable objIds = new Hashtable();
    static final Hashtable curves = new Hashtable();
    static final Hashtable names = new Hashtable();

    static void defineCurve(String name, ASN1ObjectIdentifier oid, X9ECParametersHolder holder)
    {
        objIds.put(name, oid);
        names.put(oid, name);
        curves.put(oid, holder);
    }

    static
    {
        defineCurve("prime192v1", X9ObjectIdentifiers.prime192v1, prime192v1);
        defineCurve("prime192v2", X9ObjectIdentifiers.prime192v2, prime192v2);
        defineCurve("prime192v3", X9ObjectIdentifiers.prime192v3, prime192v3);
        defineCurve("prime239v1", X9ObjectIdentifiers.prime239v1, prime239v1);
        defineCurve("prime239v2", X9ObjectIdentifiers.prime239v2, prime239v2);
        defineCurve("prime239v3", X9ObjectIdentifiers.prime239v3, prime239v3);
        defineCurve("prime256v1", X9ObjectIdentifiers.prime256v1, prime256v1);
        defineCurve("c2pnb163v1", X9ObjectIdentifiers.c2pnb163v1, c2pnb163v1);
        defineCurve("c2pnb163v2", X9ObjectIdentifiers.c2pnb163v2, c2pnb163v2);
        defineCurve("c2pnb163v3", X9ObjectIdentifiers.c2pnb163v3, c2pnb163v3);
        defineCurve("c2pnb176w1", X9ObjectIdentifiers.c2pnb176w1, c2pnb176w1);
        defineCurve("c2tnb191v1", X9ObjectIdentifiers.c2tnb191v1, c2tnb191v1);
        defineCurve("c2tnb191v2", X9ObjectIdentifiers.c2tnb191v2, c2tnb191v2);
        defineCurve("c2tnb191v3", X9ObjectIdentifiers.c2tnb191v3, c2tnb191v3);
        defineCurve("c2pnb208w1", X9ObjectIdentifiers.c2pnb208w1, c2pnb208w1);
        defineCurve("c2tnb239v1", X9ObjectIdentifiers.c2tnb239v1, c2tnb239v1);
        defineCurve("c2tnb239v2", X9ObjectIdentifiers.c2tnb239v2, c2tnb239v2);
        defineCurve("c2tnb239v3", X9ObjectIdentifiers.c2tnb239v3, c2tnb239v3);
        defineCurve("c2pnb272w1", X9ObjectIdentifiers.c2pnb272w1, c2pnb272w1);
        defineCurve("c2pnb304w1", X9ObjectIdentifiers.c2pnb304w1, c2pnb304w1);
        defineCurve("c2tnb359v1", X9ObjectIdentifiers.c2tnb359v1, c2tnb359v1);
        defineCurve("c2pnb368w1", X9ObjectIdentifiers.c2pnb368w1, c2pnb368w1);
        defineCurve("c2tnb431r1", X9ObjectIdentifiers.c2tnb431r1, c2tnb431r1);
    }

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

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

        return null;
    }

    /**
     * return the X9ECParameters object for the named curve represented by
     * the passed in object identifier. Null if the curve isn't present.
     *
     * @param oid an object identifier representing a named curve, if present.
     */
    public static X9ECParameters getByOID(
        ASN1ObjectIdentifier oid)
    {
        X9ECParametersHolder holder = (X9ECParametersHolder)curves.get(oid);

        if (holder != null)
        {
            return holder.getParameters();
        }

        return null;
    }

    /**
     * return the object identifier signified by the passed in name. Null
     * if there is no object identifier associated with name.
     *
     * @return the object identifier associated with name, if present.
     */
    public static ASN1ObjectIdentifier getOID(
        String name)
    {
        return (ASN1ObjectIdentifier)objIds.get(Strings.toLowerCase(name));
    }

    /**
     * return the named curve name represented by the given object identifier.
     */
    public static String getName(
        ASN1ObjectIdentifier oid)
    {
        return (String)names.get(oid);
    }

    /**
     * returns an enumeration containing the name strings for curves
     * contained in this structure.
     */
    public static Enumeration getNames()
    {
        return objIds.keys();
    }
}