init commit

output/Libraries/BouncyCastle.Crypto/Org/BouncyCastle/Asn1/Nist/NistNamedCurves.cs

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+using System.Collections;
+using Org.BouncyCastle.Asn1.Sec;
+using Org.BouncyCastle.Asn1.X9;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1.Nist;
+
+public sealed class NistNamedCurves
+{
+	private static readonly IDictionary objIds;
+
+	private static readonly IDictionary names;
+
+	public static IEnumerable Names => new EnumerableProxy(names.Values);
+
+	private NistNamedCurves()
+	{
+	}
+
+	private static void DefineCurveAlias(string name, DerObjectIdentifier oid)
+	{
+		objIds.Add(Platform.ToUpperInvariant(name), oid);
+		names.Add(oid, name);
+	}
+
+	static NistNamedCurves()
+	{
+		objIds = Platform.CreateHashtable();
+		names = Platform.CreateHashtable();
+		DefineCurveAlias("B-163", SecObjectIdentifiers.SecT163r2);
+		DefineCurveAlias("B-233", SecObjectIdentifiers.SecT233r1);
+		DefineCurveAlias("B-283", SecObjectIdentifiers.SecT283r1);
+		DefineCurveAlias("B-409", SecObjectIdentifiers.SecT409r1);
+		DefineCurveAlias("B-571", SecObjectIdentifiers.SecT571r1);
+		DefineCurveAlias("K-163", SecObjectIdentifiers.SecT163k1);
+		DefineCurveAlias("K-233", SecObjectIdentifiers.SecT233k1);
+		DefineCurveAlias("K-283", SecObjectIdentifiers.SecT283k1);
+		DefineCurveAlias("K-409", SecObjectIdentifiers.SecT409k1);
+		DefineCurveAlias("K-571", SecObjectIdentifiers.SecT571k1);
+		DefineCurveAlias("P-192", SecObjectIdentifiers.SecP192r1);
+		DefineCurveAlias("P-224", SecObjectIdentifiers.SecP224r1);
+		DefineCurveAlias("P-256", SecObjectIdentifiers.SecP256r1);
+		DefineCurveAlias("P-384", SecObjectIdentifiers.SecP384r1);
+		DefineCurveAlias("P-521", SecObjectIdentifiers.SecP521r1);
+	}
+
+	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 SecNamedCurves.GetByOid(oid);
+	}
+
+	public static DerObjectIdentifier GetOid(string name)
+	{
+		return (DerObjectIdentifier)objIds[Platform.ToUpperInvariant(name)];
+	}
+
+	public static string GetName(DerObjectIdentifier oid)
+	{
+		return (string)names[oid];
+	}
+}