1 files changed, 86 insertions, 0 deletions
diff --git a/crypto/src/bcpg/UserAttributeSubpacket.cs b/crypto/src/bcpg/UserAttributeSubpacket.cs
new file mode 100644
index 000000000..bd49d2150
--- /dev/null
+++ b/crypto/src/bcpg/UserAttributeSubpacket.cs
@@ -0,0 +1,86 @@
+using System;
+using System.IO;
+
+using Org.BouncyCastle.Utilities;
+
+namespace Org.BouncyCastle.Bcpg
+{
+    /**
+    * Basic type for a user attribute sub-packet.
+    */
+    public class UserAttributeSubpacket
+    {
+        private readonly UserAttributeSubpacketTag	type;
+        private readonly byte[]						data;
+
+		internal UserAttributeSubpacket(
+            UserAttributeSubpacketTag	type,
+            byte[]						data)
+        {
+            this.type = type;
+            this.data = data;
+        }
+
+		public UserAttributeSubpacketTag SubpacketType
+        {
+            get { return type; }
+        }
+
+		/**
+        * return the generic data making up the packet.
+        */
+        public byte[] GetData()
+        {
+            return data;
+        }
+
+        public void Encode(
+            Stream os)
+        {
+            int bodyLen = data.Length + 1;
+
+            if (bodyLen < 192)
+            {
+                os.WriteByte((byte)bodyLen);
+            }
+            else if (bodyLen <= 8383)
+            {
+                bodyLen -= 192;
+
+                os.WriteByte((byte)(((bodyLen >> 8) & 0xff) + 192));
+                os.WriteByte((byte)bodyLen);
+            }
+            else
+            {
+                os.WriteByte(0xff);
+                os.WriteByte((byte)(bodyLen >> 24));
+                os.WriteByte((byte)(bodyLen >> 16));
+                os.WriteByte((byte)(bodyLen >> 8));
+                os.WriteByte((byte)bodyLen);
+            }
+
+            os.WriteByte((byte) type);
+            os.Write(data, 0, data.Length);
+        }
+
+        public override bool Equals(
+            object obj)
+        {
+            if (obj == this)
+                return true;
+
+			UserAttributeSubpacket other = obj as UserAttributeSubpacket;
+
+			if (other == null)
+				return false;
+
+			return type == other.type
+				&& Arrays.AreEqual(data, other.data);
+        }
+
+		public override int GetHashCode()
+        {
+			return type.GetHashCode() ^ Arrays.GetHashCode(data);
+        }
+    }
+}