/// <summary>
/// Return an output stream which will encrypt the data as it is written to it.
/// </summary>
protected override IPacketWriter Open()
{
var writer = base.Open();
if (cOut != null)
{
throw new InvalidOperationException("generator already in open state");
}
// TODO: Do we want compatibility with old PGP? (IDEA + no password iirc)
if (methods.Count == 0)
{
throw new InvalidOperationException("No encryption methods specified");
}
var c = PgpUtilities.GetSymmetricAlgorithm(defAlgorithm);
if (methods.Count == 1 && methods[0] is PbeMethod)
{
PbeMethod m = (PbeMethod)methods[0];
c.Key = m.GetKey();
writer.WritePacket(m.GetSessionInfoPacket());
}
else
{
c.GenerateKey();
byte[] sessionInfo = CreateSessionInfo(defAlgorithm, c.Key);
foreach (EncMethod m in methods)
{
writer.WritePacket(m.GetSessionInfoPacket(sessionInfo));
}
}
try
{
if (withIntegrityPacket)
{
pOut = writer.GetPacketStream(new SymmetricEncIntegrityPacket());
}
else
{
pOut = writer.GetPacketStream(new SymmetricEncDataPacket());
}
int blockSize = (c.BlockSize + 7) / 8;
byte[] inLineIv = new byte[blockSize * 2]; // Aligned to block size
RandomNumberGenerator.Fill(inLineIv.AsSpan(0, blockSize));
inLineIv[blockSize] = inLineIv[blockSize - 2];
inLineIv[blockSize + 1] = inLineIv[blockSize - 1];
ICryptoTransform encryptor;
c.IV = new byte[blockSize];
if (withIntegrityPacket)
{
encryptor = c.CreateEncryptor();
}
else
{
encryptor = c.CreateEncryptor();
var encryptedInlineIv = encryptor.TransformFinalBlock(inLineIv, 0, inLineIv.Length);
pOut.Write(encryptedInlineIv.AsSpan(0, blockSize + 2));
c.IV = encryptedInlineIv.AsSpan(2, blockSize).ToArray();
encryptor = c.CreateEncryptor();
}
Stream myOut = cOut = new CryptoStream(pOut, new ZeroPaddedCryptoTransform(encryptor), CryptoStreamMode.Write);
if (withIntegrityPacket)
{
digest = SHA1.Create();
myOut = digestOut = new CryptoStream(new FilterStream(myOut), digest, CryptoStreamMode.Write);
myOut.Write(inLineIv, 0, blockSize + 2);
}
return(writer.CreateNestedWriter(new WrappedGeneratorStream(myOut, _ => Close())));
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
}
private Stream Open(Stream outStr, long length, byte[] buffer)
{
//IL_000d: Unknown result type (might be due to invalid IL or missing references)
//IL_0025: Unknown result type (might be due to invalid IL or missing references)
//IL_0033: Unknown result type (might be due to invalid IL or missing references)
if (cOut != null)
{
throw new InvalidOperationException("generator already in open state");
}
if (((global::System.Collections.ICollection)methods).get_Count() == 0)
{
throw new InvalidOperationException("No encryption methods specified");
}
if (outStr == null)
{
throw new ArgumentNullException("outStr");
}
pOut = new BcpgOutputStream(outStr);
KeyParameter keyParameter;
if (((global::System.Collections.ICollection)methods).get_Count() == 1)
{
if (methods.get_Item(0) is PbeMethod)
{
PbeMethod pbeMethod = (PbeMethod)methods.get_Item(0);
keyParameter = pbeMethod.GetKey();
}
else
{
keyParameter = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] si = CreateSessionInfo(defAlgorithm, keyParameter);
PubMethod pubMethod = (PubMethod)methods.get_Item(0);
try
{
pubMethod.AddSessionInfo(si, rand);
}
catch (global::System.Exception exception)
{
throw new PgpException("exception encrypting session key", exception);
}
}
pOut.WritePacket((ContainedPacket)methods.get_Item(0));
}
else
{
keyParameter = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] si2 = CreateSessionInfo(defAlgorithm, keyParameter);
for (int i = 0; i != ((global::System.Collections.ICollection)methods).get_Count(); i++)
{
EncMethod encMethod = (EncMethod)methods.get_Item(i);
try
{
encMethod.AddSessionInfo(si2, rand);
}
catch (global::System.Exception exception2)
{
throw new PgpException("exception encrypting session key", exception2);
}
pOut.WritePacket(encMethod);
}
}
string symmetricCipherName = PgpUtilities.GetSymmetricCipherName(defAlgorithm);
if (symmetricCipherName == null)
{
throw new PgpException("null cipher specified");
}
try
{
symmetricCipherName = ((!withIntegrityPacket) ? (symmetricCipherName + "/OpenPGPCFB/NoPadding") : (symmetricCipherName + "/CFB/NoPadding"));
c = CipherUtilities.GetCipher(symmetricCipherName);
byte[] iv = new byte[c.GetBlockSize()];
c.Init(forEncryption: true, new ParametersWithRandom(new ParametersWithIV(keyParameter, iv), rand));
if (buffer == null)
{
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, length + c.GetBlockSize() + 2 + 1 + 22);
((Stream)pOut).WriteByte((byte)1);
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, length + c.GetBlockSize() + 2, oldFormat);
}
}
else if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, buffer);
((Stream)pOut).WriteByte((byte)1);
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, buffer);
}
int blockSize = c.GetBlockSize();
byte[] array = new byte[blockSize + 2];
rand.NextBytes(array, 0, blockSize);
global::System.Array.Copy((global::System.Array)array, array.Length - 4, (global::System.Array)array, array.Length - 2, 2);
Stream val = (Stream)(object)(cOut = new CipherStream((Stream)(object)pOut, null, c));
if (withIntegrityPacket)
{
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
val = (Stream)(object)(digestOut = new DigestStream(val, null, digest));
}
val.Write(array, 0, array.Length);
return((Stream)(object)new WrappedGeneratorStream(this, val));
}
catch (global::System.Exception exception3)
{
throw new PgpException("Exception creating cipher", exception3);
}
}
/// <summary>
/// <p>
/// If buffer is non null stream assumed to be partial, otherwise the length will be used
/// to output a fixed length packet.
/// </p>
/// <p>
/// The stream created can be closed off by either calling Close()
/// on the stream or Close() on the generator. Closing the returned
/// stream does not close off the Stream parameter <c>outStr</c>.
/// </p>
/// </summary>
private Stream Open(
Stream outStr,
long length,
byte[] buffer)
{
if (cOut != null)
{
throw new InvalidOperationException("generator already in open state");
}
if (methods.Count == 0)
{
throw new InvalidOperationException("No encryption methods specified");
}
if (outStr == null)
{
throw new ArgumentNullException("outStr");
}
pOut = new BcpgOutputStream(outStr);
KeyParameter key;
if (methods.Count == 1)
{
if (methods[0] is PbeMethod)
{
PbeMethod m = (PbeMethod)methods[0];
key = m.GetKey();
}
else
{
key = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] sessionInfo = CreateSessionInfo(defAlgorithm, key);
PubMethod m = (PubMethod)methods[0];
try
{
m.AddSessionInfo(sessionInfo, rand);
}
catch (Exception e)
{
throw new PgpException("exception encrypting session key", e);
}
}
pOut.WritePacket((ContainedPacket)methods[0]);
}
else // multiple methods
{
key = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] sessionInfo = CreateSessionInfo(defAlgorithm, key);
for (int i = 0; i != methods.Count; i++)
{
EncMethod m = (EncMethod)methods[i];
try
{
m.AddSessionInfo(sessionInfo, rand);
}
catch (Exception e)
{
throw new PgpException("exception encrypting session key", e);
}
pOut.WritePacket(m);
}
}
string cName = PgpUtilities.GetSymmetricCipherName(defAlgorithm);
if (cName == null)
{
throw new PgpException("null cipher specified");
}
try
{
if (withIntegrityPacket)
{
cName += "/CFB/NoPadding";
}
else
{
cName += "/OpenPGPCFB/NoPadding";
}
c = CipherUtilities.GetCipher(cName);
// TODO Confirm the IV should be all zero bytes (not inLineIv - see below)
byte[] iv = new byte[c.GetBlockSize()];
c.Init(true, new ParametersWithRandom(new ParametersWithIV(key, iv), rand));
if (buffer == null)
{
//
// we have to Add block size + 2 for the Generated IV and + 1 + 22 if integrity protected
//
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, length + c.GetBlockSize() + 2 + 1 + 22);
pOut.WriteByte(1); // version number
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, length + c.GetBlockSize() + 2, oldFormat);
}
}
else
{
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, buffer);
pOut.WriteByte(1); // version number
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, buffer);
}
}
int blockSize = c.GetBlockSize();
byte[] inLineIv = new byte[blockSize + 2];
rand.NextBytes(inLineIv, 0, blockSize);
Array.Copy(inLineIv, inLineIv.Length - 4, inLineIv, inLineIv.Length - 2, 2);
Stream myOut = cOut = new CipherStream(pOut, null, c);
if (withIntegrityPacket)
{
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
myOut = digestOut = new DigestStream(myOut, null, digest);
}
myOut.Write(inLineIv, 0, inLineIv.Length);
return(new WrappedGeneratorStream(this, myOut));
}
catch (Exception e)
{
throw new PgpException("Exception creating cipher", e);
}
}
private Stream Open(Stream outStr, long length, byte[] buffer)
{
if (cOut != null)
{
throw new InvalidOperationException("generator already in open state");
}
if (methods.Count == 0)
{
throw new InvalidOperationException("No encryption methods specified");
}
if (outStr == null)
{
throw new ArgumentNullException("outStr");
}
pOut = new BcpgOutputStream(outStr);
KeyParameter keyParameter;
if (methods.Count == 1)
{
if (methods[0] is PbeMethod)
{
PbeMethod pbeMethod = (PbeMethod)methods[0];
keyParameter = pbeMethod.GetKey();
}
else
{
keyParameter = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] si = CreateSessionInfo(defAlgorithm, keyParameter);
PubMethod pubMethod = (PubMethod)methods[0];
try
{
pubMethod.AddSessionInfo(si, rand);
}
catch (Exception exception)
{
throw new PgpException("exception encrypting session key", exception);
}
}
pOut.WritePacket((ContainedPacket)methods[0]);
}
else
{
keyParameter = PgpUtilities.MakeRandomKey(defAlgorithm, rand);
byte[] si2 = CreateSessionInfo(defAlgorithm, keyParameter);
for (int i = 0; i != methods.Count; i++)
{
EncMethod encMethod = (EncMethod)methods[i];
try
{
encMethod.AddSessionInfo(si2, rand);
}
catch (Exception exception2)
{
throw new PgpException("exception encrypting session key", exception2);
}
pOut.WritePacket(encMethod);
}
}
string symmetricCipherName = PgpUtilities.GetSymmetricCipherName(defAlgorithm);
if (symmetricCipherName == null)
{
throw new PgpException("null cipher specified");
}
try
{
symmetricCipherName = ((!withIntegrityPacket) ? (symmetricCipherName + "/OpenPGPCFB/NoPadding") : (symmetricCipherName + "/CFB/NoPadding"));
c = CipherUtilities.GetCipher(symmetricCipherName);
byte[] iv = new byte[c.GetBlockSize()];
c.Init(forEncryption: true, new ParametersWithRandom(new ParametersWithIV(keyParameter, iv), rand));
if (buffer == null)
{
if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, length + c.GetBlockSize() + 2 + 1 + 22);
pOut.WriteByte(1);
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, length + c.GetBlockSize() + 2, oldFormat);
}
}
else if (withIntegrityPacket)
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricEncryptedIntegrityProtected, buffer);
pOut.WriteByte(1);
}
else
{
pOut = new BcpgOutputStream(outStr, PacketTag.SymmetricKeyEncrypted, buffer);
}
int blockSize = c.GetBlockSize();
byte[] array = new byte[blockSize + 2];
rand.NextBytes(array, 0, blockSize);
Array.Copy(array, array.Length - 4, array, array.Length - 2, 2);
Stream stream = cOut = new CipherStream(pOut, null, c);
if (withIntegrityPacket)
{
string digestName = PgpUtilities.GetDigestName(HashAlgorithmTag.Sha1);
IDigest digest = DigestUtilities.GetDigest(digestName);
stream = (digestOut = new DigestStream(stream, null, digest));
}
stream.Write(array, 0, array.Length);
return(new WrappedGeneratorStream(this, stream));
}
catch (Exception exception3)
{
throw new PgpException("Exception creating cipher", exception3);
}
}
