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POAESCrypt decryption between iOS and PHP
 

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    <p>I am having a heck of a time figuring out how to decrypt a string encrypted with the NSData+AESCrypt.m (<a href="http://iphonedevelopment.blogspot.com/2009/02/strong-encryption-for-cocoa-cocoa-touch.html">Explained here</a>)</p> <p>I have been looking at a handful of other threads, but I only need the iDevice to send a string to a PHP file encrypted, and then it gets decrypted inside PHP (where it gets stored into a database).</p> <p>This code :</p> <pre><code>NSString *encryptedString = [@"Hello" AES256EncryptWithKey:@"a16byteslongkey!"]; NSLog(@"The strign encrypted : %@",encryptedString); </code></pre> <p>Returns the string encrypted : <strong>7opqbb7sEVNoXplyQv/X8g==</strong></p> <p>And here is my PHP code for decryption:</p> <pre><code>function decrypt_data($data, $key) { return mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $key,$data,MCRYPT_MODE_ECB); } function unpadPKCS7($data, $blockSize) { $length = strlen ( $data ); if ($length &gt; 0) { $first = substr ( $data, - 1 ); if (ord ( $first ) &lt;= $blockSize) { for($i = $length - 2; $i &gt; 0; $i --) if (ord ( $data [$i] != $first )) break; return substr ( $data, 0, $i ); } } return $data; } function decrypt_string($string) { $string = unpadPKCS7($string,128); $string = decrypt_data($string,"a16byteslongkey!"); return $string; } die('&lt;br&gt;Basic :'.decrypt_string('7opqbb7sEVNoXplyQv/X8g==')); </code></pre> <p>UPDATE:</p> <p>Been doing some MD5 decryption and experimenting a lot, but still far from achieving usable results. This is what I got so far:</p> <pre><code>Original string : Hello AES256Encrypt result : 7opqbb7sEVNoXplyQv/X8 base64_decode Decrypted: îŠjm¾ìSh^™rBÿ× mcrypt_rijndael_128 : Õ¯Öå«Ž(ás2’'u) mcrypt_rijndael_128 &amp; hex2bin : UÃ)ı+úy´e </code></pre> <p>Sadly, no matter how I bend and twist this, I just get jibberish. Can anyone see what I'm doing wrong?</p>
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    1. CORelated: [How to do AES256 decryption in PHP?](http://stackoverflow.com/questions/1628138/how-to-do-aes256-decryption-in-php)
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    2. COI have been looking at that as well, and been trying with a direct copy of his decrypt_data function, and using 1234567890123456 as my iv in the encode function... but still no cigar
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    3. COYou've seen the pack() comment there? Not that I think it's the solution, but probably worth to be aware of.
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