XOREncryption/C#/Main.cs

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C#
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using System;
class XOREncryption
{
private static string encryptDecrypt(string input) {
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char[] key = {'K', 'C', 'Q'}; //Any chars will work, in an array of any size
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char[] output = new char[input.Length];
for(int i = 0; i < input.Length; i++) {
output[i] = (char) (input[i] ^ key[i % key.Length]);
}
return new string(output);
}
public static void Main (string[] args)
{
string encrypted = encryptDecrypt("kylewbanks.com");
Console.WriteLine ("Encrypted:" + encrypted);
string decrypted = encryptDecrypt(encrypted);
Console.WriteLine ("Decrypted:" + decrypted);
}
}