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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,
bool isLongLength,
byte[] data)
: base(SignatureSubpacketTag.NotationData, critical, isLongLength, data)
{
}
public NotationData(
bool critical,
bool humanReadable,
string notationName,
string notationValue)
: base(SignatureSubpacketTag.NotationData, critical, false,
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] == 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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