Add new classes in Math.Field and some other EC-related stuff from Java

1 files changed, 118 insertions, 0 deletions

diff --git a/crypto/src/asn1/x9/ECNamedCurveTable.cs b/crypto/src/asn1/x9/ECNamedCurveTable.cs
new file mode 100644
index 000000000..0030d376b
--- /dev/null
+++ b/crypto/src/asn1/x9/ECNamedCurveTable.cs
@@ -0,0 +1,118 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Asn1.Nist;
+using Org.BouncyCastle.Asn1.Sec;
+using Org.BouncyCastle.Asn1.TeleTrust;
+using Org.BouncyCastle.Utilities;
+using Org.BouncyCastle.Utilities.Collections;
+
+namespace Org.BouncyCastle.Asn1.X9
+{
+    /**
+     * A general class that reads all X9.62 style EC curve tables.
+     */
+    public class ECNamedCurveTable
+    {
+        /**
+         * return a X9ECParameters object representing the passed in named
+         * curve. The routine returns null if the curve is not present.
+         *
+         * @param name the name of the curve requested
+         * @return an X9ECParameters object or null if the curve is not available.
+         */
+        public static X9ECParameters GetByName(string name)
+        {
+            X9ECParameters ecP = X962NamedCurves.GetByName(name);
+
+            if (ecP == null)
+            {
+                ecP = SecNamedCurves.GetByName(name);
+            }
+
+            if (ecP == null)
+            {
+                ecP = TeleTrusTNamedCurves.GetByName(name);
+            }
+
+            if (ecP == null)
+            {
+                ecP = NistNamedCurves.GetByName(name);
+            }
+
+            return ecP;
+        }
+
+        /**
+         * 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)
+        {
+            DerObjectIdentifier oid = X962NamedCurves.GetOid(name);
+
+            if (oid == null)
+            {
+                oid = SecNamedCurves.GetOid(name);
+            }
+
+            if (oid == null)
+            {
+                oid = TeleTrusTNamedCurves.GetOid(name);
+            }
+
+            if (oid == null)
+            {
+                oid = NistNamedCurves.GetOid(name);
+            }
+
+            return oid;
+        }
+
+        /**
+         * return a X9ECParameters object representing the passed in named
+         * curve.
+         *
+         * @param oid the object id of the curve requested
+         * @return an X9ECParameters object or null if the curve is not available.
+         */
+        public static X9ECParameters GetByOid(DerObjectIdentifier oid)
+        {
+            X9ECParameters ecP = X962NamedCurves.GetByOid(oid);
+
+            if (ecP == null)
+            {
+                ecP = SecNamedCurves.GetByOid(oid);
+            }
+
+            if (ecP == null)
+            {
+                ecP = TeleTrusTNamedCurves.GetByOid(oid);
+            }
+
+            // NOTE: All the NIST curves are currently from SEC, so no point in redundant OID lookup
+
+            return ecP;
+        }
+
+        /**
+         * return an enumeration of the names of the available curves.
+         *
+         * @return an enumeration of the names of the available curves.
+         */
+        public static IEnumerable Names
+        {
+            get
+            {
+                IList v = Platform.CreateArrayList();
+                CollectionUtilities.AddRange(v, X962NamedCurves.Names);
+                CollectionUtilities.AddRange(v, SecNamedCurves.Names);
+                CollectionUtilities.AddRange(v, NistNamedCurves.Names);
+                CollectionUtilities.AddRange(v, TeleTrusTNamedCurves.Names);
+                return v;
+            }
+        }
+    }
+}