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using System.IO;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Bcpg
{
/// <remarks>Basic packet for a PGP secret key.</remarks>
public class SecretKeyPacket
: ContainedPacket //, PublicKeyAlgorithmTag
{
public const int UsageNone = 0x00;
public const int UsageChecksum = 0xff;
public const int UsageSha1 = 0xfe;
private PublicKeyPacket pubKeyPacket;
private readonly byte[] secKeyData;
private int s2kUsage;
private SymmetricKeyAlgorithmTag encAlgorithm;
private S2k s2k;
private byte[] iv;
internal SecretKeyPacket(
BcpgInputStream bcpgIn)
{
if (this is SecretSubkeyPacket)
{
pubKeyPacket = new PublicSubkeyPacket(bcpgIn);
}
else
{
pubKeyPacket = new PublicKeyPacket(bcpgIn);
}
s2kUsage = bcpgIn.ReadByte();
if (s2kUsage == UsageChecksum || s2kUsage == UsageSha1)
{
encAlgorithm = (SymmetricKeyAlgorithmTag) bcpgIn.ReadByte();
s2k = new S2k(bcpgIn);
}
else
{
encAlgorithm = (SymmetricKeyAlgorithmTag) s2kUsage;
}
if (!(s2k != null && s2k.Type == S2k.GnuDummyS2K && s2k.ProtectionMode == 0x01))
{
if (s2kUsage != 0)
{
if (((int) encAlgorithm) < 7)
{
iv = new byte[8];
}
else
{
iv = new byte[16];
}
bcpgIn.ReadFully(iv);
}
}
secKeyData = bcpgIn.ReadAll();
}
public SecretKeyPacket(
PublicKeyPacket pubKeyPacket,
SymmetricKeyAlgorithmTag encAlgorithm,
S2k s2k,
byte[] iv,
byte[] secKeyData)
{
this.pubKeyPacket = pubKeyPacket;
this.encAlgorithm = encAlgorithm;
if (encAlgorithm != SymmetricKeyAlgorithmTag.Null)
{
this.s2kUsage = UsageChecksum;
}
else
{
this.s2kUsage = UsageNone;
}
this.s2k = s2k;
this.iv = Arrays.Clone(iv);
this.secKeyData = secKeyData;
}
public SecretKeyPacket(
PublicKeyPacket pubKeyPacket,
SymmetricKeyAlgorithmTag encAlgorithm,
int s2kUsage,
S2k s2k,
byte[] iv,
byte[] secKeyData)
{
this.pubKeyPacket = pubKeyPacket;
this.encAlgorithm = encAlgorithm;
this.s2kUsage = s2kUsage;
this.s2k = s2k;
this.iv = Arrays.Clone(iv);
this.secKeyData = secKeyData;
}
public SymmetricKeyAlgorithmTag EncAlgorithm
{
get { return encAlgorithm; }
}
public int S2kUsage
{
get { return s2kUsage; }
}
public byte[] GetIV()
{
return Arrays.Clone(iv);
}
public S2k S2k
{
get { return s2k; }
}
public PublicKeyPacket PublicKeyPacket
{
get { return pubKeyPacket; }
}
public byte[] GetSecretKeyData()
{
return secKeyData;
}
public byte[] GetEncodedContents()
{
MemoryStream bOut = new MemoryStream();
using (var pOut = new BcpgOutputStream(bOut))
{
pOut.Write(pubKeyPacket.GetEncodedContents());
pOut.WriteByte((byte)s2kUsage);
if (s2kUsage == UsageChecksum || s2kUsage == UsageSha1)
{
pOut.WriteByte((byte)encAlgorithm);
pOut.WriteObject(s2k);
}
if (iv != null)
{
pOut.Write(iv);
}
if (secKeyData != null && secKeyData.Length > 0)
{
pOut.Write(secKeyData);
}
}
return bOut.ToArray();
}
public override void Encode(BcpgOutputStream bcpgOut)
{
bcpgOut.WritePacket(PacketTag.SecretKey, GetEncodedContents());
}
}
}
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