hi guys,
i trying to read in a file, encrypt it and write it out but i cant decrypt it to be the same file. After i check i found that the encrypted value is different from what i wrote out tats why it failed to decrypt correctly.
My Code
<?php
/*--------------Encrypt and write to new file ---------------*/
$filename = "test.jpg";
$fp=fopen($filename,"rb");
$file=fread($fp,filesize($filename));
echo "Original File: <br>".$file."<br /><br />";
$key = "dab94f925b350349ad6b67b68def954b";
$encrypted = mcrypt_cbc(MCRYPT_RIJNDAEL_128,substr($key,0,32) ,$file,MCRYPT_ENCRYPT,substr($key,32,16));
echo "Encrypted: <br>".$encrypted."<br /><br />";
$enFile = "testE.jpg";
$Handle = fopen($enFile, 'w');
fwrite($Handle, $encrypted);
fclose($Handle);
/*--------------END of Encrypt and write to new file ---------------*/
/*--------------Decrypt and write to new file ---------------*/
$enfile = file_get_contents ("testE.jpg");
echo "Read Decrypted File: <br>".$enfile."<br /><br />";
echo "Encrypted File look like: <br>".$enfile."<br /><br />";
$decrypted = trim(mcrypt_cbc(MCRYPT_RIJNDAEL_128,substr($key,0,32) ,$enfile,MCRYPT_DECRYPT,substr($key,32,16)));
$enFile = "testDec.jpg";
$Handle = fopen($enFile, 'w');
fwrite($Handle, $decrypted);
fclose($Handle);
/*--------------END of Encrypt and write to new file ---------------*/
?>
i noticed that some characters such as � were missing when i read back the encrypted file
Is there a proper way to write the binary to a file exactly
or am I doing something else wrong?
really appreciate any advise
writing out encrypted file is different
Moderator: General Moderators
- jaoudestudios
- DevNet Resident
- Posts: 1483
- Joined: Wed Jun 18, 2008 8:32 am
- Location: Surrey
Re: writing out encrypted file is different
I wrote these functions last year, it is not the highest encryption as it is only ECB.
I have used them many times in the past and had no problem.
Hopefull they will help.
Encryption & Decryption link...
http://www.forum.jaoudestudios.com/view ... ?f=13&t=14
I have used them many times in the past and had no problem.
Hopefull they will help.
Encryption & Decryption link...
http://www.forum.jaoudestudios.com/view ... ?f=13&t=14
Re: writing out encrypted file is different
thank jaoudestudios
from what i learn from your code, i use the hextobin and bintohex to do the necessary translation when writing and reading from the files and it work fine with my code.
Appreciate your prompt reply
from what i learn from your code, i use the hextobin and bintohex to do the necessary translation when writing and reading from the files and it work fine with my code.
Appreciate your prompt reply
- jaoudestudios
- DevNet Resident
- Posts: 1483
- Joined: Wed Jun 18, 2008 8:32 am
- Location: Surrey
Re: writing out encrypted file is different
No problem 