base64_decode 是难还是易?

chungwoo

最近找了些wp的footer.php都加密了

在网上搜了一下,落伍那有篇留言,有些很易,有些却说很难

footer应算简单的吧

引一个

wxdqz at 2007-7-07 05:17:43
很难算的   我算个footer.php花了N个小时

但上次那个金光牛B一下就替我把一个footer算出来,对他来说好像很容易

不知道有没有现成工具解(估计没有吧)

chungwoo

1. var keyStr = "ABCDEFGHIJKLMNOP" +
   
2. "QRSTUVWXYZabcdef" +
   
3. "ghijklmnopqrstuv" +
   
4. "wxyz0123456789+/" +
   
5. "=";
   
6. 
   
7. function encode64(input) {
   
8.   var output = "";
   
9.   var chr1, chr2, chr3 = "";
   
10.   var enc1, enc2, enc3, enc4 = "";
    
11.   var i = 0;
    
12. 
    
13.   do {
    
14.     chr1 = input.charCodeAt(i++);
    
15.     chr2 = input.charCodeAt(i++);
    
16.     chr3 = input.charCodeAt(i++);
    
17. 
    
18.     enc1 = chr1 >> 2;
    
19.     enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
    
20.     enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
    
21.     enc4 = chr3 & 63;
    
22. 
    
23.     if (isNaN(chr2)) {
    
24.       enc3 = enc4 = 64;
    
25.     } else if (isNaN(chr3)) {
    
26.       enc4 = 64;
    
27.     }
    
28. 
    
29.     output = output +
    
30.       keyStr.charAt(enc1) +
    
31.       keyStr.charAt(enc2) +
    
32.       keyStr.charAt(enc3) +
    
33.       keyStr.charAt(enc4);
    
34.     chr1 = chr2 = chr3 = "";
    
35.     enc1 = enc2 = enc3 = enc4 = "";
    
36.   } while (i < input.length);
    
37. 
    
38.   return output;
    
39. }
    
40. 
    
41. function decode64(input) {
    
42.   var output = "";
    
43.   var chr1, chr2, chr3 = "";
    
44.   var enc1, enc2, enc3, enc4 = "";
    
45.   var i = 0;
    
46. 
    
47.   // remove all characters that are not A-Z, a-z, 0-9, +, /, or =
    
48.   var base64test = /[^A-Za-z0-9\+\/\=]/g;
    
49.   if (base64test.exec(input)) {
    
50.     alert("There were invalid base64 characters in the input text.\n" +
    
51.         "Valid base64 characters are A-Z, a-z, 0-9, '+', '/', and '='\n" +
    
52.         "Expect errors in decoding.");
    
53.   }
    
54.   input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    
55. 
    
56.   do {
    
57.     enc1 = keyStr.indexOf(input.charAt(i++));
    
58.     enc2 = keyStr.indexOf(input.charAt(i++));
    
59.     enc3 = keyStr.indexOf(input.charAt(i++));
    
60.     enc4 = keyStr.indexOf(input.charAt(i++));
    
61. 
    
62.     chr1 = (enc1 << 2) | (enc2 >> 4);
    
63.     chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
    
64.     chr3 = ((enc3 & 3) << 6) | enc4;
    
65. 
    
66.     output = output + String.fromCharCode(chr1);
    
67. 
    
68.     if (enc3 != 64) {
    
69.       output = output + String.fromCharCode(chr2);
    
70.     }
    
71.     if (enc4 != 64) {
    
72.       output = output + String.fromCharCode(chr3);
    
73.     }
    
74. 
    
75.     chr1 = chr2 = chr3 = "";
    
76.     enc1 = enc2 = enc3 = enc4 = "";
    
77. 
    
78.   } while (i < input.length);
    
79. 
    
80.   return output;
    
81. }

复制代码

不知能不能用

zjtv

加密后是否成这样了

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

随波逐流

他说的是解密,好象短一些的数据可以成功解出来,上面那种特别长的,一直没解出来过.

幽鬼狼魂

我记得好像只是换成echo就可以

chungwoo

好像有人说得很难,有人说很简单

我的解决了

把模版装上去,看源文件就解决了

我的只做到这步就行了

ashun

www.zzxt.com/tools/base64.html