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POCan't get the same result for encryption with mcrypt and phpseclib
 

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  1. POCan't get the same result for encryption with mcrypt and phpseclib
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    <p>I had an implementation that encrypts an input string using mcrypt. Unfortunately I can't use this anymore because mcrypt isn't installed on the server and I can't install it. So I've had a look at phpseclib but unfortunately I don't get the same encrypted string. Here is my code:</p> <pre><code>include('Crypt/AES.php'); $key256 = "1234567890123456"; $iv = "6543210987654321"; $cleartext = "This a teststring :)"; echo $cleartext . "&lt;br /&gt;&lt;br /&gt;"; $cipher = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, ''); if (mcrypt_generic_init($cipher, $key256, $iv) != -1) { // PHP pads with NULL bytes if $cleartext is not a multiple of the block size.. $cipherText = mcrypt_generic($cipher,$cleartext ); mcrypt_generic_deinit($cipher); } $enc64 = bin2hex($cipherText); echo $enc64 . "&lt;br /&gt;"; while (strlen($cleartext) % 16 != 0) { $cleartext .= "\0"; } $aes = new Crypt_AES(); $aes-&gt;setKey($key256); $aes-&gt;setIV($iv); $cipherText = $aes-&gt;encrypt($cleartext); $enc64 = bin2hex($cipherText); echo $enc64; </code></pre> <p>After running the script (on the development server that has mcrypt installed) I get the following output:</p> <blockquote> <p>This a teststring :)</p> <p>0fc60e5a06eca68d4aada496e0e83ea65806abfe7d8f72723da470e6c9e86372 0fc60e5a06eca68d4aada496e0e83ea65806abfe7d8f72723da470e6c9e8637231b74e99d9b729813e974f211550d175</p> </blockquote> <p>As you can see both encrypted strings are identical. Almost. The one that has been encrypted with phpseclib is one block too long and I have no idea why. I've already tried different key and block sizes. I've also tried to use the Crypt_Rijndael class of phpseclib. Hope one of you can point me in the right direction.</p>
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    1. PO
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    1. USMichael Schmidt
    1. USMichael Schmidt
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    1. PO
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    1. COWhat is the default padding on phpseclib? You might want to try explicitly setting the padding method on both versions.
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      1. POCan't get the same result for encryption with mcrypt and phpseclib
      1. USrossum
    2. COIt was so obvious... Thanks heaps. $aes->disablePadding() did the job. I couldn't find a method to set the default padding. So I'm disabling it completely. Seems to work fine. I can't mark a comment as the right answer, can I?
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      1. POCan't get the same result for encryption with mcrypt and phpseclib
      1. USMichael Schmidt
    3. CODefault padding on phpseclib is PKCS#1. Actually, that's the only type of padding phpseclib supports.
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      1. POCan't get the same result for encryption with mcrypt and phpseclib
      1. USneubert
 

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