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using System;
using System.IO;
using Org.BouncyCastle.Math;
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 BigInteger[] 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 BigInteger[]{ new MPInteger(bcpgIn).Value };
break;
case PublicKeyAlgorithmTag.ElGamalEncrypt:
case PublicKeyAlgorithmTag.ElGamalGeneral:
data = new BigInteger[]
{
new MPInteger(bcpgIn).Value,
new MPInteger(bcpgIn).Value
};
break;
default:
throw new IOException("unknown PGP public key algorithm encountered");
}
}
public PublicKeyEncSessionPacket(
long keyId,
PublicKeyAlgorithmTag algorithm,
BigInteger[] data)
{
this.version = 3;
this.keyId = keyId;
this.algorithm = algorithm;
this.data = (BigInteger[]) data.Clone();
}
public int Version
{
get { return version; }
}
public long KeyId
{
get { return keyId; }
}
public PublicKeyAlgorithmTag Algorithm
{
get { return algorithm; }
}
public BigInteger[] GetEncSessionKey()
{
return (BigInteger[]) data.Clone();
}
public override void Encode(
BcpgOutputStream bcpgOut)
{
MemoryStream bOut = new MemoryStream();
BcpgOutputStream pOut = new BcpgOutputStream(bOut);
pOut.WriteByte((byte) version);
pOut.WriteLong(keyId);
pOut.WriteByte((byte)algorithm);
for (int i = 0; i != data.Length; i++)
{
MPInteger.Encode(pOut, data[i]);
}
bcpgOut.WritePacket(PacketTag.PublicKeyEncryptedSession , bOut.ToArray(), true);
}
}
}
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