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    <p>see my post here: <a href="https://stackoverflow.com/questions/8438040/php-ios-aes-encryption/8707736#8707736">PHP iOS AES Encryption</a></p> <p>I keep reposting this as I see the same question over and over.</p> <hr> <p>I just got through this same sort of project. I used the library you referenced in "also considered..."</p> <p>Here is some example code to decrypt with php:</p> <pre><code>$iv2 = ''; for($i=0;$i&lt;16;$i++){ $iv2 .= "\0"; } $plain_text_CBC = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $key, $encrypted_text, MCRYPT_MODE_CBC, $iv2); var_dump($plain_text_CBC); </code></pre> <p>Make sure your keys are both 256-bit (32 characters, I have not yet had any encoding issues, but if you do, remember that you are encrypting bytes, not characters). Note that 128 in MCRYPT_RIJNDAEL_128 is the block size and not the key size, while in the method AES256DecryptWithKey, 256 is a reference to the key size, while the block size is 128. AES256DecryptWithKey runs in CBC mode, but has a null initialization vector (iv).</p> <p>CBC means that each block depends on the last block, and so it uses a pre-set, usually random, "block -1" called the IV</p> <p>ECB means that each block is encrypted in the same way, hence it reveals when two blocks in the same message are the same. The library mentioned does not use it, so I mentioned it just for contrast.</p> <p>The use of a zero iv (0000000000000000 in bytes) is considered insecure, but it does provide you with some additional security (but one might still be able to tell if the fist 16 characters of your plain text were the same each time). To fix this you would have to create an NSData *iv variable for the IV and modify the CCcrypt argument of NSData+AESCrypt.m to add [iv bytes] for the iv parameter (I have not yet tested this code), and you would need to store this iv and pass it to the php along with you message. But first I would test and have everything working with a zero iv.</p>
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