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  1. PO
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    <p>Your encryption looks very bogus:</p> <pre><code> $result = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, (SALTKEY . str_repeat(chr(0x00), 16)), base64_encode($text), 'ecb'); $pad_char = ord(substr($result, -1)); return substr($result, 0, strlen($result) - $pad_char); </code></pre> <p>You encode the text with base64, then encrypt it, and then and then try to <strong>remove</strong> padding?</p> <p>Instead, you have to</p> <ul> <li><strong>add</strong> padding (if the encryption function doesn't already do this),</li> <li>encrypt</li> <li>then base-64-encode the result (if you want to have it somehow readable by humans or transmit over a non-binary-safe channel).</li> </ul> <p>This could look like this:</p> <pre><code>$padded = pad($text); $encrypted = mcrypt_encrypt(MCRYPT_RIJNDAEL_128, (SALTKEY . str_repeat(chr(0x00), 16)), $padded, 'ecb'); $result = base64_encode($encrypted); </code></pre> <p>(Have a look at the user-contributed notes at the <a href="http://php.net/mcrypt-encrypt" rel="nofollow">mcrypt_encrypt documentation</a> for an example on how to create the padding.)</p> <p>Of course, there are some more things to remark:</p> <ul> <li><p>Don't ever use ECB-mode, if you don't know anything about cryptography. It is an unsafe mode of operation. Use CBC-mode (with a random initialization vector, which is sent with the data).</p></li> <li><p>You create your key by padding the SALTKEY with zeros. This makes your key in effect weaker than necessary. (Having a key hard-coded in the code is a bad idea anyways.) Supply a full 128-bit key, or derive one from a password using salt and a key derivation function (like PBKDF-2) with a high iteration count.</p></li> <li><p>Your decryption function should also check that the padding is valid (i.e. consists of identical bytes), not simply removing it.</p></li> <li><p>You should also use a message authentication code (MAC) with your message, to avoid some chosen-ciphertext attacks which allow decrypting a message.</p></li> </ul>
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    1. POPHP AES Decryption working Encryption NOT
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    1. USPaŭlo Ebermann
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    1. COYou made really good points, right now I want to have it working second part will be doing it right. and Vote up for you.. thansk
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