Simple Javascript encrypt, PHP decrypt with shared secret key

user_66580 0
Viewed 44582

This is not about security. It is also not to make it hard to break. I'm looking for a simple algorithm to change a string (a url) in a way it does not resemble the original. The encryption will be done with javascript. Then I want to feed the encrypted string to a PHP function to change it back to the original. Both ends could share a secret key, or the conversions could be key-less and rely on just logic.

The ideal solution

  1. will be simple
  2. will use available javascript functions for encryption
  3. will use available php functions for decryption
  4. will produce encrypted string in way not to resemble the plain text at all
  5. will only use lower-case alphabet characters and numbers in the encrypted string
  6. is not a method widely used like Base64-ing as encryption.

Edit: The last requirement was added after shamittomar's answer.

encryption algorithm php javascript
5 Answers

Well I found this page and found Redcully's program not work for me so I thought It happens with all others. finally I got reason and fixed it. Here new code is... Thanks to Redcully :)

JS function:

function encode(str) {
  var encoded = "";
  for (i=0; i<str.length;i++) {
    var a = str.charCodeAt(i);
    var b = a ^ 51;    // bitwise XOR with any number, e.g. 123
    encoded = encoded+String.fromCharCode(b);
  }
  return encoded;
}

PHP function:

function decode($encoded) {
  $decoded = "";
  for( $i = 0; $i < strlen($encoded); $i++ ) {
    $b = ord($encoded[$i]);
    $a = $b ^ 51;  // <-- must be same number used to encode the character
    $decoded .= chr($a);
  }
  return $decoded;
}
user_85527880
Related