SecretKeyPacket
using Org.BouncyCastle.Utilities;
using System.IO;
namespace Org.BouncyCastle.Bcpg
{
public class SecretKeyPacket : ContainedPacket
{
public const int UsageNone = 0;
public const int UsageChecksum = 255;
public const int UsageSha1 = 254;
private PublicKeyPacket pubKeyPacket;
private readonly byte[] secKeyData;
private int s2kUsage;
private SymmetricKeyAlgorithmTag encAlgorithm;
private S2k s2k;
private byte[] iv;
public SymmetricKeyAlgorithmTag EncAlgorithm => encAlgorithm;
public int S2kUsage => s2kUsage;
public S2k S2k => s2k;
public PublicKeyPacket PublicKeyPacket => pubKeyPacket;
internal SecretKeyPacket(BcpgInputStream bcpgIn)
{
if (this is SecretSubkeyPacket)
pubKeyPacket = new PublicSubkeyPacket(bcpgIn);
else
pubKeyPacket = new PublicKeyPacket(bcpgIn);
s2kUsage = bcpgIn.ReadByte();
if (s2kUsage == 255 || s2kUsage == 254) {
encAlgorithm = (SymmetricKeyAlgorithmTag)bcpgIn.ReadByte();
s2k = new S2k(bcpgIn);
} else
encAlgorithm = (SymmetricKeyAlgorithmTag)s2kUsage;
if ((s2k == null || s2k.Type != 101 || s2k.ProtectionMode != 1) && s2kUsage != 0) {
if (encAlgorithm < SymmetricKeyAlgorithmTag.Aes128)
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 != 0)
s2kUsage = 255;
else
s2kUsage = 0;
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 byte[] GetIV()
{
return Arrays.Clone(iv);
}
public byte[] GetSecretKeyData()
{
return secKeyData;
}
public byte[] GetEncodedContents()
{
MemoryStream memoryStream = new MemoryStream();
using (BcpgOutputStream bcpgOutputStream = new BcpgOutputStream(memoryStream)) {
bcpgOutputStream.Write(pubKeyPacket.GetEncodedContents());
bcpgOutputStream.WriteByte((byte)s2kUsage);
if (s2kUsage == 255 || s2kUsage == 254) {
bcpgOutputStream.WriteByte((byte)encAlgorithm);
bcpgOutputStream.WriteObject(s2k);
}
if (iv != null)
bcpgOutputStream.Write(iv);
if (secKeyData != null && secKeyData.Length != 0)
bcpgOutputStream.Write(secKeyData);
}
return memoryStream.ToArray();
}
public override void Encode(BcpgOutputStream bcpgOut)
{
bcpgOut.WritePacket(PacketTag.SecretKey, GetEncodedContents());
}
}
}