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using System;
using System.IO;
using Org.BouncyCastle.Utilities.Date;
namespace Org.BouncyCastle.Bcpg
{
/// <remarks>Basic packet for a PGP public key.</remarks>
public class PublicKeyPacket
: ContainedPacket //, PublicKeyAlgorithmTag
{
private int version;
private long time;
private int validDays;
private PublicKeyAlgorithmTag algorithm;
private IBcpgKey key;
internal PublicKeyPacket(
BcpgInputStream bcpgIn)
{
version = bcpgIn.ReadByte();
time = ((uint)bcpgIn.ReadByte() << 24) | ((uint)bcpgIn.ReadByte() << 16)
| ((uint)bcpgIn.ReadByte() << 8) | (uint)bcpgIn.ReadByte();
if (version <= 3)
{
validDays = (bcpgIn.ReadByte() << 8) | bcpgIn.ReadByte();
}
algorithm = (PublicKeyAlgorithmTag) bcpgIn.ReadByte();
switch ((PublicKeyAlgorithmTag) algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaGeneral:
case PublicKeyAlgorithmTag.RsaSign:
key = new RsaPublicBcpgKey(bcpgIn);
break;
case PublicKeyAlgorithmTag.Dsa:
key = new DsaPublicBcpgKey(bcpgIn);
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
key = new ElGamalPublicBcpgKey(bcpgIn);
break;
default:
throw new IOException("unknown PGP public key algorithm encountered");
}
}
/// <summary>Construct a version 4 public key packet.</summary>
public PublicKeyPacket(
PublicKeyAlgorithmTag algorithm,
DateTime time,
IBcpgKey key)
{
this.version = 4;
this.time = DateTimeUtilities.DateTimeToUnixMs(time) / 1000L;
this.algorithm = algorithm;
this.key = key;
}
public int Version
{
get { return version; }
}
public PublicKeyAlgorithmTag Algorithm
{
get { return algorithm; }
}
public int ValidDays
{
get { return validDays; }
}
public DateTime GetTime()
{
return DateTimeUtilities.UnixMsToDateTime(time * 1000L);
}
public IBcpgKey Key
{
get { return key; }
}
public byte[] GetEncodedContents()
{
MemoryStream bOut = new MemoryStream();
BcpgOutputStream pOut = new BcpgOutputStream(bOut);
pOut.WriteByte((byte) version);
pOut.WriteInt((int) time);
if (version <= 3)
{
pOut.WriteShort((short) validDays);
}
pOut.WriteByte((byte) algorithm);
pOut.WriteObject((BcpgObject)key);
return bOut.ToArray();
}
public override void Encode(
BcpgOutputStream bcpgOut)
{
bcpgOut.WritePacket(PacketTag.PublicKey, GetEncodedContents(), true);
}
}
}
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