102 lines
2.5 KiB
C#
102 lines
2.5 KiB
C#
using System;
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using System.IO;
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using System.Text;
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namespace Org.BouncyCastle.Bcpg.Sig
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{
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/**
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* Class provided a NotationData object according to
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* RFC2440, Chapter 5.2.3.15. Notation Data
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*/
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public class NotationData
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: SignatureSubpacket
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{
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public const int HeaderFlagLength = 4;
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public const int HeaderNameLength = 2;
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public const int HeaderValueLength = 2;
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public NotationData(
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bool critical,
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byte[] data)
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: base(SignatureSubpacketTag.NotationData, critical, data)
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{
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}
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public NotationData(
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bool critical,
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bool humanReadable,
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string notationName,
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string notationValue)
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: base(SignatureSubpacketTag.NotationData, critical,
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createData(humanReadable, notationName, notationValue))
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{
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}
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private static byte[] createData(
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bool humanReadable,
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string notationName,
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string notationValue)
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{
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MemoryStream os = new MemoryStream();
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// (4 octets of flags, 2 octets of name length (M),
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// 2 octets of value length (N),
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// M octets of name data,
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// N octets of value data)
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// flags
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os.WriteByte(humanReadable ? (byte)0x80 : (byte)0x00);
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os.WriteByte(0x0);
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os.WriteByte(0x0);
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os.WriteByte(0x0);
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byte[] nameData, valueData = null;
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int nameLength, valueLength;
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nameData = Encoding.UTF8.GetBytes(notationName);
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nameLength = System.Math.Min(nameData.Length, 0xFF);
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valueData = Encoding.UTF8.GetBytes(notationValue);
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valueLength = System.Math.Min(valueData.Length, 0xFF);
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// name length
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os.WriteByte((byte)(nameLength >> 8));
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os.WriteByte((byte)(nameLength >> 0));
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// value length
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os.WriteByte((byte)(valueLength >> 8));
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os.WriteByte((byte)(valueLength >> 0));
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// name
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os.Write(nameData, 0, nameLength);
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// value
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os.Write(valueData, 0, valueLength);
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return os.ToArray();
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}
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public bool IsHumanReadable
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{
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get { return data[0] == (byte)0x80; }
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}
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public string GetNotationName()
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{
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int nameLength = ((data[HeaderFlagLength] << 8) + (data[HeaderFlagLength + 1] << 0));
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int namePos = HeaderFlagLength + HeaderNameLength + HeaderValueLength;
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return Encoding.UTF8.GetString(data, namePos, nameLength);
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}
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public string GetNotationValue()
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{
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int nameLength = ((data[HeaderFlagLength] << 8) + (data[HeaderFlagLength + 1] << 0));
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int valueLength = ((data[HeaderFlagLength + HeaderNameLength] << 8) + (data[HeaderFlagLength + HeaderNameLength + 1] << 0));
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int valuePos = HeaderFlagLength + HeaderNameLength + HeaderValueLength + nameLength;
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return Encoding.UTF8.GetString(data, valuePos, valueLength);
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}
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}
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}
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