73 lines
2.1 KiB
C#
73 lines
2.1 KiB
C#
using System.Collections;
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using Org.BouncyCastle.Asn1.Sec;
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using Org.BouncyCastle.Asn1.X9;
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using Org.BouncyCastle.Utilities;
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using Org.BouncyCastle.Utilities.Collections;
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namespace Org.BouncyCastle.Asn1.Nist;
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public sealed class NistNamedCurves
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{
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private static readonly IDictionary objIds;
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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 NistNamedCurves()
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{
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}
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private static void DefineCurveAlias(string name, DerObjectIdentifier oid)
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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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}
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static NistNamedCurves()
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{
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objIds = Platform.CreateHashtable();
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names = Platform.CreateHashtable();
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DefineCurveAlias("B-163", SecObjectIdentifiers.SecT163r2);
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DefineCurveAlias("B-233", SecObjectIdentifiers.SecT233r1);
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DefineCurveAlias("B-283", SecObjectIdentifiers.SecT283r1);
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DefineCurveAlias("B-409", SecObjectIdentifiers.SecT409r1);
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DefineCurveAlias("B-571", SecObjectIdentifiers.SecT571r1);
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DefineCurveAlias("K-163", SecObjectIdentifiers.SecT163k1);
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DefineCurveAlias("K-233", SecObjectIdentifiers.SecT233k1);
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DefineCurveAlias("K-283", SecObjectIdentifiers.SecT283k1);
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DefineCurveAlias("K-409", SecObjectIdentifiers.SecT409k1);
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DefineCurveAlias("K-571", SecObjectIdentifiers.SecT571k1);
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DefineCurveAlias("P-192", SecObjectIdentifiers.SecP192r1);
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DefineCurveAlias("P-224", SecObjectIdentifiers.SecP224r1);
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DefineCurveAlias("P-256", SecObjectIdentifiers.SecP256r1);
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DefineCurveAlias("P-384", SecObjectIdentifiers.SecP384r1);
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DefineCurveAlias("P-521", SecObjectIdentifiers.SecP521r1);
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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 SecNamedCurves.GetByOid(oid);
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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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