public static string Decrypt(this string message, int[] keyLength)
{
Contract.Assert(message != null);
string output = String.Empty;
for (int i = 0; i < message.Length; i++)
{
output += Alphabet[(Alphabet.IndexOf(message[i]) + Alphabet.Length - keyLength[i % keyLength.Length]) % Alphabet.Length];
}
return(output);
}
public static string Decrypt(this string message, string key)
{
Contract.Assert(message != null && key != null);
//var keyInAlphabetIndex = key.Select(x => Alphabet.IndexOf(Alphabet[(Alphabet.Length - Alphabet.IndexOf(x)) % Alphabet.Length])).ToArray();
var keyInAlphabetIndex = key.Select(x => Alphabet.IndexOf(x)).ToArray();
string output = String.Empty;
for (int i = 0; i < message.Length; i++)
{
output += Alphabet[(Alphabet.IndexOf(message[i]) + Alphabet.Length - keyInAlphabetIndex[i % keyInAlphabetIndex.Length]) % Alphabet.Length];
}
return(output);
}
public string Encode(string stringToEncode)
{
if (stringToEncode.Any(n => !Alphabet.Contains(n) && !Separators.Contains(n)))
{
throw new Exception("Finded symbol not from alphabet - ");
}
string s = string.Empty;
for (int i = 0; i < stringToEncode.Length; i++)
{
if (Separators.Any(n => n == stringToEncode[i]))
{
s += stringToEncode[i];
}
else
{
s += LookupTable[i % KeyWord.Length][Alphabet.IndexOf(stringToEncode[i])];
}
}
return(s);
}
