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using System;
using System.Collections.Generic;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Math.EC;
using Org.BouncyCastle.Math.EC.Multiplier;
using Org.BouncyCastle.Utilities.Collections;
using Org.BouncyCastle.Utilities.Encoders;
namespace Org.BouncyCastle.Asn1.Anssi
{
/// <summary>Elliptic curve registry for ANSSI.</summary>
public static class AnssiNamedCurves
{
private static X9ECPoint ConfigureBasepoint(ECCurve curve, string encoding)
{
X9ECPoint G = new X9ECPoint(curve, Hex.DecodeStrict(encoding));
WNafUtilities.ConfigureBasepoint(G.Point);
return G;
}
private static ECCurve ConfigureCurve(ECCurve curve)
{
return curve;
}
private static BigInteger FromHex(string hex)
{
return new BigInteger(1, Hex.DecodeStrict(hex));
}
internal class Frp256v1Holder
: X9ECParametersHolder
{
private Frp256v1Holder() {}
internal static readonly X9ECParametersHolder Instance = new Frp256v1Holder();
protected override ECCurve CreateCurve()
{
BigInteger p = FromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C03");
BigInteger a = FromHex("F1FD178C0B3AD58F10126DE8CE42435B3961ADBCABC8CA6DE8FCF353D86E9C00");
BigInteger b = FromHex("EE353FCA5428A9300D4ABA754A44C00FDFEC0C9AE4B1A1803075ED967B7BB73F");
BigInteger n = FromHex("F1FD178C0B3AD58F10126DE8CE42435B53DC67E140D2BF941FFDD459C6D655E1");
BigInteger h = BigInteger.One;
return ConfigureCurve(new FpCurve(p, a, b, n, h, isInternal: true));
}
protected override X9ECParameters CreateParameters()
{
byte[] S = null;
ECCurve curve = Curve;
X9ECPoint G = ConfigureBasepoint(curve,
"04B6B3D4C356C139EB31183D4749D423958C27D2DCAF98B70164C97A2DD98F5CFF6142E0F7C8B204911F9271F0F3ECEF8C2701C307E8E4C9E183115A1554062CFB");
return new X9ECParameters(curve, G, curve.Order, curve.Cofactor, S);
}
}
private static readonly Dictionary<string, DerObjectIdentifier> objIds =
new Dictionary<string, DerObjectIdentifier>(StringComparer.OrdinalIgnoreCase);
private static readonly Dictionary<DerObjectIdentifier, X9ECParametersHolder> curves =
new Dictionary<DerObjectIdentifier, X9ECParametersHolder>();
private static readonly Dictionary<DerObjectIdentifier, string> names =
new Dictionary<DerObjectIdentifier, string>();
private static void DefineCurve(string name, DerObjectIdentifier oid, X9ECParametersHolder holder)
{
objIds.Add(name, oid);
names.Add(oid, name);
curves.Add(oid, holder);
}
static AnssiNamedCurves()
{
DefineCurve("FRP256v1", AnssiObjectIdentifiers.FRP256v1, Frp256v1Holder.Instance);
}
/// <summary>Look up the <see cref="X9ECParameters"/> for the curve with the given name.</summary>
/// <param name="name">The name of the curve.</param>
public static X9ECParameters GetByName(string name)
{
DerObjectIdentifier oid = GetOid(name);
return oid == null ? null : GetByOid(oid);
}
/// <summary>Look up an <see cref="X9ECParametersHolder"/> for the curve with the given name.</summary>
/// <remarks>
/// Allows accessing the <see cref="ECCurve">curve</see> without necessarily triggering the creation of the
/// full <see cref="X9ECParameters"/>.
/// </remarks>
/// <param name="name">The name of the curve.</param>
public static X9ECParametersHolder GetByNameLazy(string name)
{
DerObjectIdentifier oid = GetOid(name);
return oid == null ? null : GetByOidLazy(oid);
}
/// <summary>Look up the <see cref="X9ECParameters"/> for the curve with the given
/// <see cref="DerObjectIdentifier">OID</see>.</summary>
/// <param name="oid">The <see cref="DerObjectIdentifier">OID</see> for the curve.</param>
public static X9ECParameters GetByOid(DerObjectIdentifier oid)
{
return GetByOidLazy(oid)?.Parameters;
}
/// <summary>Look up an <see cref="X9ECParametersHolder"/> for the curve with the given
/// <see cref="DerObjectIdentifier">OID</see>.</summary>
/// <remarks>
/// Allows accessing the <see cref="ECCurve">curve</see> without necessarily triggering the creation of the
/// full <see cref="X9ECParameters"/>.
/// </remarks>
/// <param name="oid">The <see cref="DerObjectIdentifier">OID</see> for the curve.</param>
public static X9ECParametersHolder GetByOidLazy(DerObjectIdentifier oid)
{
return CollectionUtilities.GetValueOrNull(curves, oid);
}
/// <summary>Look up the name of the curve with the given <see cref="DerObjectIdentifier">OID</see>.</summary>
/// <param name="oid">The <see cref="DerObjectIdentifier">OID</see> for the curve.</param>
public static string GetName(DerObjectIdentifier oid)
{
return CollectionUtilities.GetValueOrNull(names, oid);
}
/// <summary>Look up the <see cref="DerObjectIdentifier">OID</see> of the curve with the given name.</summary>
/// <param name="name">The name of the curve.</param>
public static DerObjectIdentifier GetOid(string name)
{
return CollectionUtilities.GetValueOrNull(objIds, name);
}
/// <summary>Enumerate the available curve names in this registry.</summary>
public static IEnumerable<string> Names
{
get { return CollectionUtilities.Proxy(objIds.Keys); }
}
}
}
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