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;
+ }
+ }
+}
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