1 files changed, 79 insertions, 0 deletions
diff --git a/Crypto/src/asn1/x509/X509Extension.cs b/Crypto/src/asn1/x509/X509Extension.cs
new file mode 100644
index 000000000..430ce4447
--- /dev/null
+++ b/Crypto/src/asn1/x509/X509Extension.cs
@@ -0,0 +1,79 @@
+using System;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+    /**
+     * an object for the elements in the X.509 V3 extension block.
+     */
+    public class X509Extension
+    {
+        internal bool				critical;
+        internal Asn1OctetString	value;
+
+		public X509Extension(
+            DerBoolean		critical,
+            Asn1OctetString	value)
+        {
+            if (critical == null)
+            {
+                throw new ArgumentNullException("critical");
+            }
+
+			this.critical = critical.IsTrue;
+            this.value = value;
+        }
+
+		public X509Extension(
+            bool			critical,
+            Asn1OctetString	value)
+        {
+            this.critical = critical;
+            this.value = value;
+        }
+
+		public bool IsCritical { get { return critical; } }
+
+		public Asn1OctetString Value { get { return value; } }
+
+		public Asn1Encodable GetParsedValue()
+		{
+			return ConvertValueToObject(this);
+		}
+
+		public override int GetHashCode()
+        {
+			int vh = this.Value.GetHashCode();
+
+			return IsCritical ? vh : ~vh;
+        }
+
+		public override bool Equals(
+            object obj)
+        {
+            X509Extension other = obj as X509Extension;
+            if (other == null)
+            {
+                return false;
+            }
+
+			return Value.Equals(other.Value) && IsCritical == other.IsCritical;
+        }
+
+		/// <sumary>Convert the value of the passed in extension to an object.</sumary>
+		/// <param name="ext">The extension to parse.</param>
+		/// <returns>The object the value string contains.</returns>
+		/// <exception cref="ArgumentException">If conversion is not possible.</exception>
+		public static Asn1Object ConvertValueToObject(
+			X509Extension ext)
+		{
+			try
+			{
+				return Asn1Object.FromByteArray(ext.Value.GetOctets());
+			}
+			catch (Exception e)
+			{
+				throw new ArgumentException("can't convert extension", e);
+			}
+		}
+	}
+}