分享一个PHP加密解密的类

2. class ption
3. {
5. private static $original = array('=', '+', '/');
6. private static $later = array('O0O0O', 'o0O0o', 'oo00o');
8. function __construct()
9. {
11. }
13. private static function md5($skey = '')
14. {
15. $skey = $skey ? $skey : 'ui' ; //uicms::_config('security/authkey');
16. return md5(substr($skey, 0, 16));
17. }
19. /**
20. * @use ption::en($string, $key);
21. * @param String $string 需要加密的字串
22. * @param String $skey 密钥
23. * @param int $expiry 密文有效期, 加密时候有效， 单位 秒，0 为永久有效
24. * @return String
25. */
26. static public function en($string = '', $skey = '', $expiry=0)
27. {
28. if( is_array( $string ) )
29. {
30. $string = json_encode($string); // uicms::json($string, true, 'en');
31. }
32. $string = str_pad($expiry ? $expiry + TIME : 0, 10, 0).$string;
33. $strArr = str_split(base64_encode($string));
34. $strCount = count($strArr);
35. $skey = static::md5($skey);
36. foreach (str_split($skey) as $key => $value)
37. {
38. $key }
39. return str_replace(self::$original, self::$later, join('', $strArr));
40. }
42. /**
43. * @use ption::de($string, $key);
44. * @param String $string 需要解密的字串
45. * @param String $skey 密钥
46. * @return String
47. */
48. static public function de($string = '', $skey = '')
49. {
50. $strArr = str_split(str_replace(self::$later, self::$original, $string), 2);
51. $strCount = count($strArr);
52. $skey = static::md5($skey);
53. foreach (str_split($skey) as $key => $value)
54. {
55. $key }
56. $result = base64_decode(join('', $strArr));
57. if(substr($result, 0, 10) == 0 || substr($result, 0, 10) - TIME > 0)
58. {
59. return substr($result, 10);
60. }
61. else
62. {
63. return false;
64. }
65. }
66. }

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加密解密, PHP