1 files changed, 76 insertions, 0 deletions
diff --git a/crypto/src/bcpg/SignatureSubpacket.cs b/crypto/src/bcpg/SignatureSubpacket.cs
new file mode 100644
index 000000000..ac26f8a3c
--- /dev/null
+++ b/crypto/src/bcpg/SignatureSubpacket.cs
@@ -0,0 +1,76 @@
+using System.IO;
+
+namespace Org.BouncyCastle.Bcpg
+{
+	/// <remarks>Basic type for a PGP Signature sub-packet.</remarks>
+    public class SignatureSubpacket
+    {
+        private readonly SignatureSubpacketTag type;
+        private readonly bool critical;
+
+		internal readonly byte[] data;
+
+		protected internal SignatureSubpacket(
+            SignatureSubpacketTag	type,
+            bool					critical,
+            byte[]					data)
+        {
+            this.type = type;
+            this.critical = critical;
+            this.data = data;
+        }
+
+		public SignatureSubpacketTag SubpacketType
+        {
+			get { return type; }
+        }
+
+        public bool IsCritical()
+        {
+            return critical;
+        }
+
+		/// <summary>Return the generic data making up the packet.</summary>
+        public byte[] GetData()
+        {
+            return (byte[]) data.Clone();
+        }
+
+		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);
+            }
+
+            if (critical)
+            {
+                os.WriteByte((byte)(0x80 | (int) type));
+            }
+            else
+            {
+                os.WriteByte((byte) type);
+            }
+
+            os.Write(data, 0, data.Length);
+        }
+    }
+}