/// <summary>
/// Decrypts a stream with the given configuration.
/// Not for networking.
/// </summary>
/// <param name="input"></param>
/// <param name="output"></param>
/// <param name="pass"></param>
/// <param name="initial"></param>
/// <param name="rounds"></param>
/// <param name="leftoff"></param>
/// <param name="expansion"></param>
/// <param name="additionalKey"></param>
/// <param name="callback"></param>
/// <param name="adaptor">Adaptor for PRNG</param>
public static void Decrypt(Stream input, Stream output, string pass, int initial, int rounds, int leftoff, int expansion, string additionalKey, Callback callback, BasylPseudoAdaptor adaptor)
{
BinaryWriter writer = new BinaryWriter(output);
byte[] hash = new byte[32];
byte[] o = new byte[4];
byte[] d = new byte[4];
input.Read(hash, 0, 32);
input.Read(o, 0, 4);
input.Read(d, 0, 4);
BasylReader reader = new BasylReader(input, new BasylKeyGenerator(pass, initial, rounds, leftoff, expansion, additionalKey, hash, d, o, true, adaptor));
//Speeds up decryption by doing the decryption in chunks.
int speed = MAX_SPEED;
while (speed > MIN_SPEED)
{
//Decrypt Entire File in Chunks
while (reader.GetStream().Position + speed < reader.GetStream().Length)
{
writer.Write(reader.ReadBytes(speed));
if (callback != null)
{
callback((double)reader.GetStream().Position / reader.GetStream().Length);
}
}
speed >>= 1;
}
//Decrypt Entire File
while (reader.GetStream().Position < reader.GetStream().Length)
{
writer.Write(reader.ReadByte());
if (callback != null)
{
callback((double)reader.GetStream().Position / reader.GetStream().Length);
}
}
writer.Close();
reader.Close();
reader.Dispose();
writer.Dispose();
}
/// <summary>
/// Creates a BasylReader from a Writer.
/// Completely Synchronized and Attached.
/// </summary>
/// <param name="stream"></param>
/// <param name="pass"></param>
/// <param name="writer"></param>
/// <returns></returns>
public static BasylReader CreateFrom(Stream stream, BasylWriter writer)
{
BasylReader result = new BasylReader(stream, writer.GetKeyGenerator());
return(result);
}
/// <summary>
/// Creates a BasylReader from a Writer.
/// Completely Synchronized and Attached.
/// </summary>
/// <param name="stream"></param>
/// <param name="pass"></param>
/// <param name="writer"></param>
/// <returns></returns>
public static BasylReader CreateFrom(Stream stream, BasylWriter writer)
{
BasylReader result = new BasylReader(stream, writer.GetKeyGenerator());
return result;
}
/// <summary>
/// Creates a Writer from the Reader and shares its key.
/// </summary>
/// <param name="s"></param>
/// <param name="reader"></param>
/// <returns></returns>
public static BasylWriter CreateFrom(Stream s, BasylReader reader)
{
BasylWriter writer = new BasylWriter(s, reader.GetKeyGenerator());
return(writer);
}
