XOR Encryption

[coreys]

I'm not sure if anyone has done this before, but I was rather bored so I made a XOR Encryption function with my own additions to get rid of the parts of the ASCII character set that aren't really shown in Graal.

PHP Code:

/*Paramters:
s - string to be encrypted
usechars - boolean determining whether or not it changes ascii values into characters.
key - Encryption key. (Optional)  If left NULL it replaces with the default. s must be shorter or the same length as the encryption key.
*/
public function XOREncrypt(s, usechars, key) {
  if (key == NULL)
    key = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
  temp.replace = "-";
  if (s.length() <= key.length()) {
    temp.out = "";
    for (i=0; i<s.length(); i++) {
      temp.a = getascii(s.charat(i)) xor getascii(key.charat(i));
      if (usechars) {
        if (temp.a > 32 && temp.a != 127) {
          temp.a = char(temp.a);
          if (temp.a = " ")
            temp.a = temp.replace;
        }
        else temp.a = temp.replace;
      }
      temp.out @= temp.a;
    }
    return temp.out;
  }
  else
    return "String too long. (Limit " @ key.length() @ ")";    
} 


Example:

PHP Code:

XOREncrypt("A nice cat", true, NULL); 


Which will return "-b--&#g+(>"

From what I hear, this method is hard, if not impossible to decrypt, and it's rather simple.