public byte[] DecryptStream(Stream stream, int length, int iv)
{
var buff = new byte[length];
if (!Decrypt)
{
stream.Read(buff, 0, length);
return(buff);
}
var plaintext = new byte[length];
using (var aesAlg = new Aes128CounterMode(NollaPrng.Get16Seeded(iv))) {
// Create a decryptor to perform the stream transform.
var decryptor = aesAlg.CreateDecryptor(AESKey, null);
var buffer = new byte[length];
stream.Read(buffer, 0, length);
using (MemoryStream limitedStream = new MemoryStream(buffer)) {
using (CryptoStream csDecrypt = new CryptoStream(limitedStream, decryptor, CryptoStreamMode.Read)) {
csDecrypt.Read(plaintext, 0, length);
}
}
}
return(plaintext);
}
public static void DoMain(string[] args)
{
foreach (var arg in args)
{
if (uint.TryParse(arg, out var value))
{
var prng = new NollaPrng(value);
Console.WriteLine($"Next state for seed {value}: {prng.Seed}, error on float cast {prng.Seed - ((double)(float)(prng.Seed * ((double)1 / int.MaxValue))) * (0x8000_0000)}");
Console.WriteLine($"IV bytes for given seed are: {BitConverter.ToString(Get16Seeded((int)value))}");
}
}
}
public static byte[] Get16Seeded(int seed, int seedBase = SEED_BASE)
{
var prng = new NollaPrng(seed, seedBase);
return(prng.Next16());
}
