1 files changed, 131 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/ExtendedKeyUsage.cs b/crypto/src/asn1/x509/ExtendedKeyUsage.cs
new file mode 100644
index 000000000..b5e4b7f8d
--- /dev/null
+++ b/crypto/src/asn1/x509/ExtendedKeyUsage.cs
@@ -0,0 +1,131 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+    /**
+     * The extendedKeyUsage object.
+     * <pre>
+     *      extendedKeyUsage ::= Sequence SIZE (1..MAX) OF KeyPurposeId
+     * </pre>
+     */
+    public class ExtendedKeyUsage
+        : Asn1Encodable
+    {
+        internal readonly IDictionary usageTable = Platform.CreateHashtable();
+        internal readonly Asn1Sequence seq;
+
+		public static ExtendedKeyUsage GetInstance(
+            Asn1TaggedObject	obj,
+            bool				explicitly)
+        {
+            return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
+        }
+
+		public static ExtendedKeyUsage GetInstance(
+            object obj)
+        {
+            if (obj is ExtendedKeyUsage)
+            {
+                return (ExtendedKeyUsage) obj;
+            }
+
+			if (obj is Asn1Sequence)
+            {
+                return new ExtendedKeyUsage((Asn1Sequence) obj);
+            }
+
+			if (obj is X509Extension)
+			{
+				return GetInstance(X509Extension.ConvertValueToObject((X509Extension) obj));
+			}
+
+			throw new ArgumentException("Invalid ExtendedKeyUsage: " + obj.GetType().Name);
+        }
+
+		private ExtendedKeyUsage(
+            Asn1Sequence seq)
+        {
+            this.seq = seq;
+
+			foreach (object o in seq)
+			{
+				if (!(o is DerObjectIdentifier))
+					throw new ArgumentException("Only DerObjectIdentifier instances allowed in ExtendedKeyUsage.");
+
+				this.usageTable.Add(o, o);
+            }
+        }
+
+		public ExtendedKeyUsage(
+			params KeyPurposeID[] usages)
+		{
+			this.seq = new DerSequence(usages);
+
+			foreach (KeyPurposeID usage in usages)
+			{
+				this.usageTable.Add(usage, usage);
+			}
+		}
+
+#if !SILVERLIGHT
+        [Obsolete]
+        public ExtendedKeyUsage(
+            ArrayList usages)
+            : this((IEnumerable)usages)
+        {
+        }
+#endif
+
+        public ExtendedKeyUsage(
+            IEnumerable usages)
+        {
+            Asn1EncodableVector v = new Asn1EncodableVector();
+
+			foreach (Asn1Object o in usages)
+            {
+				v.Add(o);
+
+				this.usageTable.Add(o, o);
+            }
+
+			this.seq = new DerSequence(v);
+        }
+
+		public bool HasKeyPurposeId(
+            KeyPurposeID keyPurposeId)
+        {
+            return usageTable[keyPurposeId] != null;
+        }
+
+#if !SILVERLIGHT
+        [Obsolete("Use 'GetAllUsages'")]
+        public ArrayList GetUsages()
+        {
+            return new ArrayList(usageTable.Values);
+        }
+#endif
+
+        /**
+		 * Returns all extended key usages.
+		 * The returned ArrayList contains DerObjectIdentifier instances.
+		 * @return An ArrayList with all key purposes.
+		 */
+		public IList GetAllUsages()
+		{
+			return Platform.CreateArrayList(usageTable.Values);
+		}
+
+        public int Count
+		{
+			get { return usageTable.Count; }
+		}
+
+		public override Asn1Object ToAsn1Object()
+        {
+            return seq;
+        }
+    }
+}