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using System;
using Org.BouncyCastle.Asn1.Sec;
using Org.BouncyCastle.Asn1.X9;
using Org.BouncyCastle.Crypto.Parameters;
namespace Org.BouncyCastle.Crypto.Tls
{
/// <summary>
/// RFC 4492 5.1.1
/// The named curves defined here are those specified in SEC 2 [13]. Note that many of
/// these curves are also recommended in ANSI X9.62 [7] and FIPS 186-2 [11]. Values 0xFE00
/// through 0xFEFF are reserved for private use. Values 0xFF01 and 0xFF02 indicate that the
/// client supports arbitrary prime and characteristic-2 curves, respectively (the curve
/// parameters must be encoded explicitly in ECParameters).
/// </summary>
public enum NamedCurve : int
{
sect163k1 = 1,
sect163r1 = 2,
sect163r2 = 3,
sect193r1 = 4,
sect193r2 = 5,
sect233k1 = 6,
sect233r1 = 7,
sect239k1 = 8,
sect283k1 = 9,
sect283r1 = 10,
sect409k1 = 11,
sect409r1 = 12,
sect571k1 = 13,
sect571r1 = 14,
secp160k1 = 15,
secp160r1 = 16,
secp160r2 = 17,
secp192k1 = 18,
secp192r1 = 19,
secp224k1 = 20,
secp224r1 = 21,
secp256k1 = 22,
secp256r1 = 23,
secp384r1 = 24,
secp521r1 = 25,
/*
* reserved (0xFE00..0xFEFF)
*/
arbitrary_explicit_prime_curves = 0xFF01,
arbitrary_explicit_char2_curves = 0xFF02,
}
internal class NamedCurveHelper
{
internal static ECDomainParameters GetECParameters(NamedCurve namedCurve)
{
if (!Enum.IsDefined(typeof(NamedCurve), namedCurve))
return null;
string curveName = namedCurve.ToString();
// Lazily created the first time a particular curve is accessed
X9ECParameters ecP = SecNamedCurves.GetByName(curveName);
if (ecP == null)
return null;
// It's a bit inefficient to do this conversion every time
return new ECDomainParameters(ecP.Curve, ecP.G, ecP.N, ecP.H, ecP.GetSeed());
}
}
}
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