1 files changed, 72 insertions, 0 deletions
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());
+	    }
+	}
+}