1 files changed, 112 insertions, 0 deletions
diff --git a/crypto/src/bcpg/sig/NotationData.cs b/crypto/src/bcpg/sig/NotationData.cs
new file mode 100644
index 000000000..ccc9aa745
--- /dev/null
+++ b/crypto/src/bcpg/sig/NotationData.cs
@@ -0,0 +1,112 @@
+using System;
+using System.IO;
+using System.Text;
+
+namespace Org.BouncyCastle.Bcpg.Sig
+{
+	/**
+	* Class provided a NotationData object according to
+	* RFC2440, Chapter 5.2.3.15. Notation Data
+	*/
+	public class NotationData
+		: SignatureSubpacket
+	{
+		public const int HeaderFlagLength = 4;
+		public const int HeaderNameLength = 2;
+		public const int HeaderValueLength = 2;
+
+		public NotationData(
+			bool	critical,
+			byte[]	data)
+			: base(SignatureSubpacketTag.NotationData, critical, data)
+		{
+		}
+
+		public NotationData(
+			bool	critical,
+			bool	humanReadable,
+			string	notationName,
+			string	notationValue)
+			: base(SignatureSubpacketTag.NotationData, critical,
+				createData(humanReadable, notationName, notationValue))
+		{
+		}
+
+		private static byte[] createData(
+			bool	humanReadable,
+			string	notationName,
+			string	notationValue)
+		{
+			MemoryStream os = new MemoryStream();
+
+			// (4 octets of flags, 2 octets of name length (M),
+			// 2 octets of value length (N),
+			// M octets of name data,
+			// N octets of value data)
+
+			// flags
+			os.WriteByte(humanReadable ? (byte)0x80 : (byte)0x00);
+			os.WriteByte(0x0);
+			os.WriteByte(0x0);
+			os.WriteByte(0x0);
+
+			byte[] nameData, valueData = null;
+			int nameLength, valueLength;
+
+			nameData = Encoding.UTF8.GetBytes(notationName);
+			nameLength = System.Math.Min(nameData.Length, 0xFF);
+
+			valueData = Encoding.UTF8.GetBytes(notationValue);
+			valueLength = System.Math.Min(valueData.Length, 0xFF);
+
+			// name length
+			os.WriteByte((byte)(nameLength >> 8));
+			os.WriteByte((byte)(nameLength >> 0));
+
+			// value length
+			os.WriteByte((byte)(valueLength >> 8));
+			os.WriteByte((byte)(valueLength >> 0));
+
+			// name
+			os.Write(nameData, 0, nameLength);
+
+			// value
+			os.Write(valueData, 0, valueLength);
+
+			return os.ToArray();
+		}
+
+		public bool IsHumanReadable
+		{
+			get { return data[0] == (byte)0x80; }
+		}
+
+		public string GetNotationName()
+		{
+			int nameLength = ((data[HeaderFlagLength] << 8) + (data[HeaderFlagLength + 1] << 0));
+			int namePos = HeaderFlagLength + HeaderNameLength + HeaderValueLength;
+
+			return Encoding.UTF8.GetString(data, namePos, nameLength);
+		}
+
+		public string GetNotationValue()
+		{
+			int nameLength = ((data[HeaderFlagLength] << 8) + (data[HeaderFlagLength + 1] << 0));
+			int valueLength = ((data[HeaderFlagLength + HeaderNameLength] << 8) + (data[HeaderFlagLength + HeaderNameLength + 1] << 0));
+			int valuePos = HeaderFlagLength + HeaderNameLength + HeaderValueLength + nameLength;
+
+			return Encoding.UTF8.GetString(data, valuePos, valueLength);
+		}
+
+		public byte[] GetNotationValueBytes()
+		{
+			int nameLength = ((data[HeaderFlagLength] << 8) + (data[HeaderFlagLength + 1] << 0));
+			int valueLength = ((data[HeaderFlagLength + HeaderNameLength] << 8) + (data[HeaderFlagLength + HeaderNameLength + 1] << 0));
+			int valuePos = HeaderFlagLength + HeaderNameLength + HeaderValueLength + nameLength;
+
+			byte[] bytes = new byte[valueLength];
+			Array.Copy(data, valuePos, bytes, 0, valueLength);
+			return bytes;
+		}
+	}
+}