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;
+ }
+ }
+ }
+}
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