init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/GM/GMNamedCurves.cs

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