1 files changed, 123 insertions, 0 deletions
diff --git a/crypto/src/asn1/anssi/ANSSINamedCurves.cs b/crypto/src/asn1/anssi/ANSSINamedCurves.cs
new file mode 100644
index 000000000..04e30bb07
--- /dev/null
+++ b/crypto/src/asn1/anssi/ANSSINamedCurves.cs
@@ -0,0 +1,123 @@
+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); }
+        }
+    }
+}