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using System;
using System.Collections;
using Org.BouncyCastle.Asn1;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.Collections;
namespace Org.BouncyCastle.Crypto.EC
{
public sealed class CustomNamedCurves
{
private CustomNamedCurves()
{
}
private static ECCurve ConfigureCurve(ECCurve curve)
{
return curve;
}
private static readonly IDictionary objIds = Platform.CreateHashtable();
private static readonly IDictionary curves = Platform.CreateHashtable();
private static readonly IDictionary names = Platform.CreateHashtable();
private static void DefineCurve(
string name,
DerObjectIdentifier oid,
X9ECParametersHolder holder)
{
objIds.Add(name, oid);
names.Add(oid, name);
curves.Add(oid, holder);
}
static CustomNamedCurves()
{
}
public static X9ECParameters GetByName(
string name)
{
DerObjectIdentifier oid = (DerObjectIdentifier)
objIds[Platform.ToLowerInvariant(name)];
return oid == null ? null : GetByOid(oid);
}
/**
* 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(
DerObjectIdentifier oid)
{
X9ECParametersHolder holder = (X9ECParametersHolder)curves[oid];
return holder == null ? null : holder.Parameters;
}
/**
* 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 DerObjectIdentifier GetOid(
string name)
{
return (DerObjectIdentifier)objIds[Platform.ToLowerInvariant(name)];
}
/**
* return the named curve name represented by the given object identifier.
*/
public static string GetName(
DerObjectIdentifier oid)
{
return (string)names[oid];
}
/**
* returns an enumeration containing the name strings for curves
* contained in this structure.
*/
public static IEnumerable Names
{
get { return new EnumerableProxy(objIds.Keys); }
}
}
}
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