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using System;
using System.IO;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
using Org.BouncyCastle.Utilities.IO;
namespace Org.BouncyCastle.Bcpg
{
/// <remarks>Basic packet for a PGP public key.</remarks>
public class PublicKeyEncSessionPacket
: ContainedPacket //, PublicKeyAlgorithmTag
{
private int version;
private long keyId;
private PublicKeyAlgorithmTag algorithm;
private byte[][] data;
internal PublicKeyEncSessionPacket(
BcpgInputStream bcpgIn)
{
version = bcpgIn.ReadByte();
keyId |= (long)bcpgIn.ReadByte() << 56;
keyId |= (long)bcpgIn.ReadByte() << 48;
keyId |= (long)bcpgIn.ReadByte() << 40;
keyId |= (long)bcpgIn.ReadByte() << 32;
keyId |= (long)bcpgIn.ReadByte() << 24;
keyId |= (long)bcpgIn.ReadByte() << 16;
keyId |= (long)bcpgIn.ReadByte() << 8;
keyId |= (uint)bcpgIn.ReadByte();
algorithm = (PublicKeyAlgorithmTag) bcpgIn.ReadByte();
switch ((PublicKeyAlgorithmTag) algorithm)
{
case PublicKeyAlgorithmTag.RsaEncrypt:
case PublicKeyAlgorithmTag.RsaGeneral:
data = new byte[][]{ new MPInteger(bcpgIn).GetEncoded() };
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
MPInteger p = new MPInteger(bcpgIn);
MPInteger g = new MPInteger(bcpgIn);
data = new byte[][]{
p.GetEncoded(),
g.GetEncoded(),
};
break;
case PublicKeyAlgorithmTag.ECDH:
data = new byte[][]{ Streams.ReadAll(bcpgIn) };
break;
default:
throw new IOException("unknown PGP public key algorithm encountered");
}
}
public PublicKeyEncSessionPacket(
long keyId,
PublicKeyAlgorithmTag algorithm,
byte[][] data)
{
this.version = 3;
this.keyId = keyId;
this.algorithm = algorithm;
this.data = new byte[data.Length][];
for (int i = 0; i < data.Length; ++i)
{
this.data[i] = Arrays.Clone(data[i]);
}
}
public int Version
{
get { return version; }
}
public long KeyId
{
get { return keyId; }
}
public PublicKeyAlgorithmTag Algorithm
{
get { return algorithm; }
}
public byte[][] GetEncSessionKey()
{
return data;
}
public override void Encode(BcpgOutputStream bcpgOut)
{
MemoryStream bOut = new MemoryStream();
using (var pOut = new BcpgOutputStream(bOut))
{
pOut.WriteByte((byte)version);
pOut.WriteLong(keyId);
pOut.WriteByte((byte)algorithm);
for (int i = 0; i < data.Length; ++i)
{
pOut.Write(data[i]);
}
}
bcpgOut.WritePacket(PacketTag.PublicKeyEncryptedSession, bOut.ToArray(), true);
}
}
}
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