public void GenerateKey(byte akRule, bool[] bits, int timeSteps)
{
var rule = new AKRule(akRule);
var key = new List <bool>();
var fixedIndex = new Random().Next() % bits.Length;
for (int step = 0; step < timeSteps; step++)
{
key.Add(bits[fixedIndex]);
var newBits = new bool[bits.Length];
for (int i = 0; i < bits.Length; i++)
{
var leftIndex = i - 1 < 0 ? bits.Length - 1 : i - 1;
var rightIndex = i + 1 > bits.Length - 1 ? 0 : i + 1;
var neighbour = new[] { bits[leftIndex], bits[i], bits[rightIndex] };
newBits[i] = rule.GetTransformedValue(neighbour);
}
bits = newBits;
}
var keyArray = key.ToArray();
var keyByte = new List <byte>();
for (int i = 0; i < keyArray.Length; i += 8)
{
var end = i + 8 > keyArray.Length - 1 ? keyArray.Length - 1 : i + 8;
var sign = new ArraySegment <bool>(keyArray, i, end - i).ToArray();
var ascii = ByteHelper.ConvertBoolArrayToByte(sign);
keyByte.Add(ascii);
}
KeyPrintableBytes = ByteHelper.ByteArrayToHex(keyByte.ToArray());
}
public void Decrypt(string key, string crypt)
{
var keyBytes = ByteHelper.HexToByteArray(key);
var cryptBytes = ByteHelper.HexToByteArray(crypt);
var plaintextBytes = new byte[cryptBytes.Length];
if (keyBytes.Length < cryptBytes.Length)
{
return;
}
for (int i = 0; i < cryptBytes.Length; i++)
{
var bitKey = ByteHelper.ConvertByteToBoolArray(keyBytes[i]);
var bitCrypt = ByteHelper.ConvertByteToBoolArray(cryptBytes[i]);
var plainText = new bool[8];
for (int j = 0; j < 8; j++)
{
plainText[j] = XOR(bitKey[j], bitCrypt[j]);
}
plaintextBytes[i] = ByteHelper.ConvertBoolArrayToByte(plainText);
}
Message = Encoding.ASCII.GetString(plaintextBytes);
}
public AKRule(byte value)
{
_value = ByteHelper.ConvertByteToBoolArray(value);
}