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using System;
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.Anssi
{
public class AnssiNamedCurves
{
private static ECCurve ConfigureCurve(ECCurve curve)
{
return curve;
}
private static BigInteger FromHex(string hex)
{
return new BigInteger(1, Hex.Decode(hex));
}
/*
* FRP256v1
*/
internal class Frp256v1Holder
: X9ECParametersHolder
{
private Frp256v1Holder() {}
internal static readonly X9ECParametersHolder Instance = new Frp256v1Holder();
protected override X9ECParameters CreateParameters()
{
BigInteger p = FromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C03");
BigInteger a = FromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C00");
BigInteger b = FromHex("EE353FCA5428A9300D4ABA754A44C00FDFEC0C9AE4B1A1803075ED967B7BB73F");
byte[] S = null;
BigInteger n = FromHex("F1FD178C0B3AD58F10126DE8CE42435B53DC67E140D2BF941FFDD459C6D655E1");
BigInteger h = BigInteger.One;
ECCurve curve = ConfigureCurve(new FpCurve(p, a, b, n, h));
ECPoint G = curve.DecodePoint(Hex.Decode("04"
+ "B6B3D4C356C139EB31183D4749D423958C27D2DCAF98B70164C97A2DD98F5CFF"
+ "6142E0F7C8B204911F9271F0F3ECEF8C2701C307E8E4C9E183115A1554062CFB"));
return new X9ECParameters(curve, G, n, h, S);
}
};
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(Platform.ToLowerInvariant(name), oid);
names.Add(oid, name);
curves.Add(oid, holder);
}
static AnssiNamedCurves()
{
DefineCurve("FRP256v1", AnssiObjectIdentifiers.FRP256v1, Frp256v1Holder.Instance);
}
public static X9ECParameters GetByName(
string name)
{
DerObjectIdentifier oid = GetOid(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(names.Values); }
}
}
}
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