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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);
}
}
}
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