具有时效性的php加密解密函数

demo

该函数具有时效性，只要过期就不能解密！通过时间动态加密 加密后数据多样化，增加破解难度

1. <?php
   
2. function encode_pass($tex,$key,$type="encode",$expiry=0){
   
3. $chrArr=array('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z',
   
4. 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z',
   
5. '0','1','2','3','4','5','6','7','8','9');
   
6. if($type=="decode"){
   
7. if(strlen($tex)<14)return false;
   
8. $verity_str=substr($tex, 0,8);
   
9. $tex=substr($tex, 8);
   
10. if($verity_str!=substr(md5($tex),0,8)){
    
11. //完整性验证失败
    
12. return false;
    
13. }
    
14. }
    
15. $key_b=$type=="decode"?substr($tex,0,6):$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62].$chrArr[rand()%62];
    
16. 
    
17. $rand_key=$key_b.$key;
    
18. //设置时间选项
    
19. $modnum=0;$modCount=0;$modCountStr="";
    
20. if($expiry>0){
    
21. if($type=="decode"){
    
22. $modCountStr=substr($tex,6,1);
    
23. $modCount=$modCountStr=="a"?10:floor($modCountStr);
    
24. $modnum=substr($tex,7,$modCount);
    
25. $rand_key=$rand_key.(floor((time()-$modnum)/$expiry));
    
26. }else{
    
27. $modnum=time()%$expiry;
    
28. $modCount=strlen($modnum);
    
29. $modCountStr=$modCount==10?"a":$modCount;
    
30. 
    
31. $rand_key=$rand_key.(floor(time()/$expiry));
    
32. }
    
33. $tex=$type=="decode"?base64_decode(substr($tex, (7+$modCount))):"xugui".$tex;
    
34. }else{
    
35. $tex=$type=="decode"?base64_decode(substr($tex, 6)):"xugui".$tex;
    
36. }
    
37. $rand_key=md5($rand_key);
    
38. 
    
39. 
    
40. $texlen=strlen($tex);
    
41. $reslutstr="";
    
42. for($i=0;$i<$texlen;$i++){
    
43. $reslutstr.=$tex{$i}^$rand_key{$i%32};
    
44. }
    
45. if($type!="decode"){
    
46. $reslutstr=trim(base64_encode($reslutstr),"==");
    
47. $reslutstr=$modCount?$modCountStr.$modnum.$reslutstr:$reslutstr;
    
48. $reslutstr=$key_b.$reslutstr;
    
49. $reslutstr=substr(md5($reslutstr), 0,8).$reslutstr;
    
50. }else{
    
51. if(substr($reslutstr,0, 5)!="xugui"){
    
52. return false;
    
53. }
    
54. $reslutstr=substr($reslutstr, 5);
    
55. }
    
56. return $reslutstr;
    
57. }
    
58. $psa=encode_pass("woshi ceshi yong de ","taintainxousad","encode",120);
    
59. echo $psa;
    
60. echo "\r\n解密：";
    
61. echo encode_pass($psa,"taintainxousad",'decode',120);
    
62. ?>

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来自圈子: Demo俱乐部