public void AesCryptorTest()
{
using (AesManaged aes = new AesManaged())
{
aes.GenerateKey();
aes.GenerateIV();
byte[] data = new byte[100];
new Random().NextBytes(data);
AesMachine cryptor = new AesMachine();
byte[] encrypted = cryptor.Encrypt(data);
byte[] decrypted = cryptor.Decrypt(encrypted);
Assert.IsTrue(data.SequenceEqual(decrypted));
}
}
/// <summary>
/// Decrypts a file.
/// </summary>
/// <param name="input"><see cref="EncryptedFile"/> that will be decrypted.</param>
/// <param name="output">Output <see cref="Stream"/> where the decrypted file will be written.</param>
/// <param name="reportProgress">Action that is used to report progress of decryption in percentages.</param>
public void Decrypt(EncryptedFile input, Stream output, Action <int> reportProgress = null)
{
BinaryReader reader = new BinaryReader(input.BaseStream);
reader.BaseStream.Position = input.HeaderLength;
output.Position = 0;
BinaryWriter outputWriter = new BinaryWriter(output);
byte[] decryptedAlgKey = new RsaMachine(this.Key).Decrypt(input.EncryptedKey);
reportProgress?.Invoke(35);
IMachine decryptor = null;
if (input.CryptorCode == AesMachine.Signature)
{
decryptor = new AesMachine(decryptedAlgKey, reader.ReadBytes(16));
}
else if (input.CryptorCode == TDesMachine.Signature)
{
decryptor = new TDesMachine(decryptedAlgKey, reader.ReadBytes(16));
}
else if (input.CryptorCode == TwofishMachine.Signature)
{
decryptor = new TwofishMachine(decryptedAlgKey, reader.ReadBytes(16));
}
for (int i = 0; i < input.NumberOfBlocks; i++)
{
int currentBlockSize = BitConverter.ToInt32(reader.ReadBytes(4), 0);
byte[] block = reader.ReadBytes(currentBlockSize);
outputWriter.Write(decryptor.Decrypt(block));
reportProgress?.Invoke((int)(((float)i / (float)input.NumberOfBlocks) * 1000.00));
}
reportProgress?.Invoke(1000);
}
