diff --git a/Crypto/src/crypto/tls/NamedCurve.cs b/Crypto/src/crypto/tls/NamedCurve.cs
new file mode 100644
index 000000000..c8ee189aa
--- /dev/null
+++ b/Crypto/src/crypto/tls/NamedCurve.cs
@@ -0,0 +1,72 @@
+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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