public void EncryptPackets(SymmetricAlgorithm keyedAlgorithm, params OpenPgpPacket[] packetsToEncrypt)
{
var transform = new OpenPgpCfbTransform(keyedAlgorithm, encrypt: true);
var msEncrypted = new MemoryStream();
EncryptedStream = msEncrypted;
var encryptor = new CryptoStream(msEncrypted, transform, CryptoStreamMode.Write);
// HACK: Write the prefix bytes manually rather than do it all in the transform since we need it for the hash
encryptor.Write(transform.PrefixBytes, 0, transform.PrefixBytes.Length);
var hasher = SHA1.Create();
var hashContentsStream = new MemoryStream();
var hashStream = new CryptoStream(hashContentsStream, hasher, CryptoStreamMode.Write);
hashStream.Write(transform.PrefixBytes, 0, transform.PrefixBytes.Length);
var currentPacketStream = new MemoryStream();
foreach (var currentPacketToEncrypt in packetsToEncrypt)
{
currentPacketStream.SetLength(0);
currentPacketToEncrypt.WriteTo(currentPacketStream);
currentPacketStream.Position = 0;
currentPacketStream.CopyTo(hashStream);
currentPacketStream.Position = 0;
currentPacketStream.CopyTo(encryptor);
}
var mdcPacket = new ModificationDetectionCodeOpenPgpPacket();
mdcPacket.Header.Length = hasher.HashSize / 8;
mdcPacket.Header.WriteTo(hashStream);
hashStream.FlushFinalBlock();
var hashContents = hasher.Hash;
mdcPacket.HashValue = hashContents;
mdcPacket.WriteTo(encryptor);
// SECREVIEW: Emit MDC packet
encryptor.FlushFinalBlock();
msEncrypted.Position = 0;
}
public void EncryptPackets(SymmetricAlgorithm keyedAlgorithm, params OpenPgpPacket[] packetsToEncrypt)
{
var transform = new OpenPgpCfbTransform(keyedAlgorithm, encrypt: true);
var msEncrypted = new MemoryStream();
EncryptedStream = msEncrypted;
var encryptor = new CryptoStream(msEncrypted, transform, CryptoStreamMode.Write);
// HACK: Write the prefix bytes manually rather than do it all in the transform since we need it for the hash
encryptor.Write(transform.PrefixBytes, 0, transform.PrefixBytes.Length);
var hasher = SHA1.Create();
var hashContentsStream = new MemoryStream();
var hashStream = new CryptoStream(hashContentsStream, hasher, CryptoStreamMode.Write);
hashStream.Write(transform.PrefixBytes, 0, transform.PrefixBytes.Length);
var currentPacketStream = new MemoryStream();
foreach(var currentPacketToEncrypt in packetsToEncrypt) {
currentPacketStream.SetLength(0);
currentPacketToEncrypt.WriteTo(currentPacketStream);
currentPacketStream.Position = 0;
currentPacketStream.CopyTo(hashStream);
currentPacketStream.Position = 0;
currentPacketStream.CopyTo(encryptor);
}
var mdcPacket = new ModificationDetectionCodeOpenPgpPacket();
mdcPacket.Header.Length = hasher.HashSize/8;
mdcPacket.Header.WriteTo(hashStream);
hashStream.FlushFinalBlock();
var hashContents = hasher.Hash;
mdcPacket.HashValue = hashContents;
mdcPacket.WriteTo(encryptor);
// SECREVIEW: Emit MDC packet
encryptor.FlushFinalBlock();
msEncrypted.Position = 0;
}