120 lines
3.6 KiB
C#
120 lines
3.6 KiB
C#
using System.Collections;
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using Org.BouncyCastle.Asn1.X9;
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using Org.BouncyCastle.Math;
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using Org.BouncyCastle.Math.EC;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.Collections;
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using Org.BouncyCastle.Utilities.Encoders;
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namespace Org.BouncyCastle.Asn1.GM;
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public sealed class GMNamedCurves
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{
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internal class SM2P256V1Holder : X9ECParametersHolder
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{
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internal static readonly X9ECParametersHolder Instance = new SM2P256V1Holder();
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private SM2P256V1Holder()
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{
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}
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protected override X9ECParameters CreateParameters()
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{
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BigInteger q = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFF");
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BigInteger a = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF00000000FFFFFFFFFFFFFFFC");
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BigInteger b = FromHex("28E9FA9E9D9F5E344D5A9E4BCF6509A7F39789F515AB8F92DDBCBD414D940E93");
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byte[] seed = null;
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BigInteger bigInteger = FromHex("FFFFFFFEFFFFFFFFFFFFFFFFFFFFFFFF7203DF6B21C6052B53BBF40939D54123");
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BigInteger one = BigInteger.One;
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ECCurve eCCurve = ConfigureCurve(new FpCurve(q, a, b, bigInteger, one));
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X9ECPoint g = new X9ECPoint(eCCurve, Hex.Decode("0432C4AE2C1F1981195F9904466A39C9948FE30BBFF2660BE1715A4589334C74C7BC3736A2F4F6779C59BDCEE36B692153D0A9877CC62A474002DF32E52139F0A0"));
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return new X9ECParameters(eCCurve, g, bigInteger, one, seed);
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}
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}
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internal class WapiP192V1Holder : X9ECParametersHolder
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{
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internal static readonly X9ECParametersHolder Instance = new WapiP192V1Holder();
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private WapiP192V1Holder()
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{
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}
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protected override X9ECParameters CreateParameters()
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{
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BigInteger q = FromHex("BDB6F4FE3E8B1D9E0DA8C0D46F4C318CEFE4AFE3B6B8551F");
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BigInteger a = FromHex("BB8E5E8FBC115E139FE6A814FE48AAA6F0ADA1AA5DF91985");
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BigInteger b = FromHex("1854BEBDC31B21B7AEFC80AB0ECD10D5B1B3308E6DBF11C1");
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byte[] seed = null;
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BigInteger bigInteger = FromHex("BDB6F4FE3E8B1D9E0DA8C0D40FC962195DFAE76F56564677");
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BigInteger one = BigInteger.One;
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ECCurve eCCurve = ConfigureCurve(new FpCurve(q, a, b, bigInteger, one));
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X9ECPoint g = new X9ECPoint(eCCurve, Hex.Decode("044AD5F7048DE709AD51236DE65E4D4B482C836DC6E410664002BB3A02D4AAADACAE24817A4CA3A1B014B5270432DB27D2"));
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return new X9ECParameters(eCCurve, g, bigInteger, one, seed);
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}
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}
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private static readonly IDictionary objIds;
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private static readonly IDictionary curves;
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private static readonly IDictionary names;
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public static IEnumerable Names => new EnumerableProxy(names.Values);
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private GMNamedCurves()
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{
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}
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private static ECCurve ConfigureCurve(ECCurve curve)
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{
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return curve;
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}
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private static BigInteger FromHex(string hex)
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{
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return new BigInteger(1, Hex.Decode(hex));
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}
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private static void DefineCurve(string name, DerObjectIdentifier oid, X9ECParametersHolder holder)
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{
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objIds.Add(Platform.ToUpperInvariant(name), oid);
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names.Add(oid, name);
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curves.Add(oid, holder);
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}
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static GMNamedCurves()
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{
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objIds = Platform.CreateHashtable();
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curves = Platform.CreateHashtable();
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names = Platform.CreateHashtable();
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DefineCurve("wapip192v1", GMObjectIdentifiers.wapip192v1, WapiP192V1Holder.Instance);
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DefineCurve("sm2p256v1", GMObjectIdentifiers.sm2p256v1, SM2P256V1Holder.Instance);
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}
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public static X9ECParameters GetByName(string name)
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{
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DerObjectIdentifier oid = GetOid(name);
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if (oid != null)
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{
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return GetByOid(oid);
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}
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return null;
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}
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public static X9ECParameters GetByOid(DerObjectIdentifier oid)
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{
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return ((X9ECParametersHolder)curves[oid])?.Parameters;
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}
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public static DerObjectIdentifier GetOid(string name)
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{
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return (DerObjectIdentifier)objIds[Platform.ToUpperInvariant(name)];
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}
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public static string GetName(DerObjectIdentifier oid)
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{
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return (string)names[oid];
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}
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}
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