强大的PHP加密解密类

http://blog.ddian.cn/?post=923

1. class Ender{
2. private $enkey;//加密解密用的密钥
3. //构造参数是密钥
4. public function __construct($key=''){
5. if(!$key){
6. $this->enkey=$key;
7. }
8. }
9. //设置密钥
10. public function set_key($key){
11. $this->enkey=$key;
12. }
13. private function keyED($txt,$encrypt_key)
14. {
15. $encrypt_key = md5($encrypt_key);
16. $ctr=0;
17. $tmp = "";
18. for ($i=0;$i {
19. if ($ctr==strlen($encrypt_key)) $ctr=0;
20. $tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
21. $ctr++;
22. }
23. return $tmp;
24. }
25. //加密字符串
26. public function encrypt($txt,$key='')
27. {
28. if(!$key){
29. $key=$this->enkey;
30. }
31. srand((double)microtime()*1000000);
32. $encrypt_key = md5(rand(0,32000));
33. $ctr=0;
34. $tmp = "";
35. for ($i=0;$i {
36. if ($ctr==strlen($encrypt_key)) $ctr=0;
37. $tmp.= substr($encrypt_key,$ctr,1) .
38. (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
39. $ctr++;
40. }
41. return base64_encode($this->keyED($tmp,$key));
42. }
43. //解密字符串
44. public function decrypt($txt,$key='')
45. {
46. $txt=base64_decode($txt);
47. if(!$key){
48. $key=$this->enkey;
49. }
50. $txt = $this->keyED($txt,$key);
51. $tmp = "";
52. for ($i=0;$i {
53. $md5 = substr($txt,$i,1);
54. $i++;
55. $tmp.= (substr($txt,$i,1) ^ $md5);
56. }
57. return $tmp; //http://blog.ddian.cn
58. }
60. }

复制代码