How to crack PHP eval encryption_PHP tutorial

Today we will take a deeper look at the in-depth concepts of the PHP language.

Special note: This PHP eval encryption and decryption program seems to have to be used on PHP5.

I tested eval(gzinflate(base64_decode("codes") on PHP4) )) can never be decrypted normally

The following is the code for PHP eval encryption cracking:

1. < ?php  
2. /*  
3. Taken from http://www.php.net/manual/
   de/function.eval.php#59862  
4. Directions:  
5. 1. Save this snippet as decrypt.php  
6. 2. Save encoded PHP code in coded.txt  
7. 3. Create a blank file called decoded.txt 
   (from shell do CHMOD 0666 decoded.txt)  
8. 4. Execute this script (visit decrypt.php in 
   a web browser or do php decrypt.php in the shell)  
9. 5. Open decoded.txt, the PHP should be decrypted 
   if not post the code on http://www.ariadoss.
   com/forums/web-development/lamp  
10.  
11. gzinflate执行PHP eval加密代码的解密方法翻译为中文后的文字
    (此段汉字原始文件里面可没.嘿)  
12. 1. 把这整段脚本保存为decrypt.php  
13. 2. 把需要解密的代码保存为coded.txt并且和decrypt.php在同一目录.  
14. 3. 创建一个空白文件命名为 decoded.txt (必须把 decoded.
    txt 的权限设置为CHMOD 0666,也就是可以写入的.当然,你可以
    不创建文件文件.只要文件夹有写入权限,脚本便会自动创建一个
    名为decoded.txt的文档. )  
15. 4. 运行PHP eval加密解密脚本 (浏览器中运行decrypt.php 即访问 http:
    //您的域名/存放目录/decrypt.php)  
16. 5. 打开 decoded.txt, 代码应该已经解密完成，如果出现错误请
    把代码发送到 http://www.ariadoss.com/forums/web-
    development/lamp  
17. */  
18. echo "nDECODE nested eval(gzinflate()) by DEBO 
    Jurgen <mailto:jurgen@person.benn";  
19. echo "1. Reading coded.txtn";  
20. $fp1 = fopen ("coded.txt", "r");  
21. $contents = fread ($fp1, filesize ("coded.txt"));  
22. fclose($fp1);  
23. echo "2. Decodingn";  
24. while (preg_match("/eval(gzinflate/",$contents)) {  
25. $contents=preg_replace("/<?|?>/", "", $contents);
     eval(preg_replace("/eval/", "$contents=", 
    $contents)); } echo "3. Writing decoded.txtn"; 
    $fp2 = fopen("decoded.txt","w"); fwrite($fp2, 
    trim($contents)); fclose($fp2);  
26. ?> 

Let’s briefly talk about how to use gzinflate,eval(gzinflate(base64_decode("codes")));decoding-eval-gzinflate-base64_decode.
Save the above program file decrypt.php, of course the file name can be Set it yourself.

Create a coded.txt in the same directory as this file. This contains the code encrypted by PHP eval, which is the codes in eval(gzinflate(base64_decode("codes"))) ;

To be clear, it is the original encryption text executed in eval(gzinflate(base64_decode("codes"))) to be decrypted. Execute the saved file decrypt.php, which will generate a txt file of decoded.txt, open this document. Inside is the original code of PHP eval encryption.

http://www.bkjia.com/PHPjc/445972.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/445972.htmlTechArticleToday we will take a deeper look at the deep concepts of the PHP language. Special note: This PHP eval encryption and decryption program seems to have to be used on PHP5. I tested eval on PHP4 (gzinflat...