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xor.cs

using System.Linq;

class FuskareCannotIntoEncryption {
	static void Main() {
		var pw = System.Text.Encoding.UTF8.GetBytes("hunter2");
		var key = System.Text.Encoding.UTF8.GetBytes("this is a a key");
		var dat = pw.Select((c, i) => (byte)(c ^ (i % key.Length))).ToArray<byte>();
		var ot = System.Convert.ToBase64String(dat);
		System.Console.WriteLine(ot);
		var it = System.Convert.FromBase64String(ot);
		var npw = System.Text.Encoding.UTF8.GetString(it.Select((c, i) => (byte)(c ^ (i % key.Length))).ToArray());
		System.Console.WriteLine(npw);
	}
}