1 files changed, 81 insertions, 0 deletions
diff --git a/crypto/src/asn1/x509/X509ExtensionsGenerator.cs b/crypto/src/asn1/x509/X509ExtensionsGenerator.cs
new file mode 100644
index 000000000..d6f567b22
--- /dev/null
+++ b/crypto/src/asn1/x509/X509ExtensionsGenerator.cs
@@ -0,0 +1,81 @@
+using System;
+using System.Collections;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Asn1.X509
+{
+	/// <remarks>Generator for X.509 extensions</remarks>
+	public class X509ExtensionsGenerator
+	{
+		private IDictionary extensions = Platform.CreateHashtable();
+        private IList extOrdering = Platform.CreateArrayList();
+
+		/// <summary>Reset the generator</summary>
+		public void Reset()
+		{
+            extensions = Platform.CreateHashtable();
+            extOrdering = Platform.CreateArrayList();
+		}
+
+		/// <summary>
+		/// Add an extension with the given oid and the passed in value to be included
+		/// in the OCTET STRING associated with the extension.
+		/// </summary>
+		/// <param name="oid">OID for the extension.</param>
+		/// <param name="critical">True if critical, false otherwise.</param>
+		/// <param name="extValue">The ASN.1 object to be included in the extension.</param>
+		public void AddExtension(
+			DerObjectIdentifier	oid,
+			bool				critical,
+			Asn1Encodable		extValue)
+		{
+			byte[] encoded;
+			try
+			{
+				encoded = extValue.GetDerEncoded();
+			}
+			catch (Exception e)
+			{
+				throw new ArgumentException("error encoding value: " + e);
+			}
+
+			this.AddExtension(oid, critical, encoded);
+		}
+
+		/// <summary>
+		/// Add an extension with the given oid and the passed in byte array to be wrapped
+		/// in the OCTET STRING associated with the extension.
+		/// </summary>
+		/// <param name="oid">OID for the extension.</param>
+		/// <param name="critical">True if critical, false otherwise.</param>
+		/// <param name="extValue">The byte array to be wrapped.</param>
+		public void AddExtension(
+			DerObjectIdentifier	oid,
+			bool				critical,
+			byte[]				extValue)
+		{
+			if (extensions.Contains(oid))
+			{
+				throw new ArgumentException("extension " + oid + " already added");
+			}
+
+			extOrdering.Add(oid);
+			extensions.Add(oid, new X509Extension(critical, new DerOctetString(extValue)));
+		}
+
+		/// <summary>Return true if there are no extension present in this generator.</summary>
+		/// <returns>True if empty, false otherwise</returns>
+		public bool IsEmpty
+		{
+			get { return extOrdering.Count < 1; }
+		}
+
+		/// <summary>Generate an X509Extensions object based on the current state of the generator.</summary>
+		/// <returns>An <c>X509Extensions</c> object</returns>
+		public X509Extensions Generate()
+		{
+			return new X509Extensions(extOrdering, extensions);
+		}
+	}
+}