AES

1. class aes {
3. static public $mode = MCRYPT_MODE_NOFB;
5. static public function generateKey($length=32) {
6. if (!in_array($length,array(16,24,32)))
7. return False;
9. $str = '';
10. for ($i=0;$i $str .= chr(rand(33,126));
11. }
13. return $str;
14. }
16. static public function encrypt($data, $key) {
18. if (strlen($key) > 32 || !$key)
19. return trigger_error('key too large or key is empty.', E_USER_WARNING) && False;
21. $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode);
22. $iv = mcrypt_create_iv($ivSize, (substr(PHP_OS,0,1) == 'W' ? MCRYPT_RAND : MCRYPT_DEV_URANDOM ));
23. $encryptedData = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv);
24. $encryptedData = $iv . $encryptedData;
26. return base64_encode($encryptedData);
27. }
29. static public function decrypt($data, $key) {
31. if (strlen($key) > 32 || !$key)
32. return trigger_error('key too large or key is empty.', E_USER_WARNING) && False;
34. $data = base64_decode($data);
35. if (!$data)
36. return False;
38. $ivSize = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, self::$mode);
39. $iv = substr($data, 0, $ivSize);
41. $data = substr($data, $ivSize);
43. $decryptData = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key, $data, self::$mode, $iv);
45. return $decryptData;
46. }}

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AES