89 lines
2.5 KiB
C#
89 lines
2.5 KiB
C#
using System;
|
|
using System.IO;
|
|
using Org.BouncyCastle.Bcpg.Sig;
|
|
using Org.BouncyCastle.Utilities.IO;
|
|
|
|
namespace Org.BouncyCastle.Bcpg
|
|
{
|
|
/**
|
|
* reader for signature sub-packets
|
|
*/
|
|
public class SignatureSubpacketsParser
|
|
{
|
|
private readonly Stream input;
|
|
|
|
public SignatureSubpacketsParser(
|
|
Stream input)
|
|
{
|
|
this.input = input;
|
|
}
|
|
|
|
public SignatureSubpacket ReadPacket()
|
|
{
|
|
int l = input.ReadByte();
|
|
if (l < 0)
|
|
return null;
|
|
|
|
int bodyLen = 0;
|
|
if (l < 192)
|
|
{
|
|
bodyLen = l;
|
|
}
|
|
else if (l <= 223)
|
|
{
|
|
bodyLen = ((l - 192) << 8) + (input.ReadByte()) + 192;
|
|
}
|
|
else if (l == 255)
|
|
{
|
|
bodyLen = (input.ReadByte() << 24) | (input.ReadByte() << 16)
|
|
| (input.ReadByte() << 8) | input.ReadByte();
|
|
}
|
|
else
|
|
{
|
|
// TODO Error?
|
|
}
|
|
|
|
int tag = input.ReadByte();
|
|
if (tag < 0)
|
|
throw new EndOfStreamException("unexpected EOF reading signature sub packet");
|
|
|
|
byte[] data = new byte[bodyLen - 1];
|
|
if (Streams.ReadFully(input, data) < data.Length)
|
|
throw new EndOfStreamException();
|
|
|
|
bool isCritical = ((tag & 0x80) != 0);
|
|
SignatureSubpacketTag type = (SignatureSubpacketTag)(tag & 0x7f);
|
|
switch (type)
|
|
{
|
|
case SignatureSubpacketTag.CreationTime:
|
|
return new SignatureCreationTime(isCritical, data);
|
|
case SignatureSubpacketTag.KeyExpireTime:
|
|
return new KeyExpirationTime(isCritical, data);
|
|
case SignatureSubpacketTag.ExpireTime:
|
|
return new SignatureExpirationTime(isCritical, data);
|
|
case SignatureSubpacketTag.Revocable:
|
|
return new Revocable(isCritical, data);
|
|
case SignatureSubpacketTag.Exportable:
|
|
return new Exportable(isCritical, data);
|
|
case SignatureSubpacketTag.IssuerKeyId:
|
|
return new IssuerKeyId(isCritical, data);
|
|
case SignatureSubpacketTag.TrustSig:
|
|
return new TrustSignature(isCritical, data);
|
|
case SignatureSubpacketTag.PreferredCompressionAlgorithms:
|
|
case SignatureSubpacketTag.PreferredHashAlgorithms:
|
|
case SignatureSubpacketTag.PreferredSymmetricAlgorithms:
|
|
return new PreferredAlgorithms(type, isCritical, data);
|
|
case SignatureSubpacketTag.KeyFlags:
|
|
return new KeyFlags(isCritical, data);
|
|
case SignatureSubpacketTag.PrimaryUserId:
|
|
return new PrimaryUserId(isCritical, data);
|
|
case SignatureSubpacketTag.SignerUserId:
|
|
return new SignerUserId(isCritical, data);
|
|
case SignatureSubpacketTag.NotationData:
|
|
return new NotationData(isCritical, data);
|
|
}
|
|
return new SignatureSubpacket(type, isCritical, data);
|
|
}
|
|
}
|
|
}
|