Stuck trying to decrypt AES 128 using mcrypt PHP

Question

I really need help, have spent hours trying to get this working to no avail.

I have data encrypted with AES.

Block size = 128
KeySize = 256
Mode = CBC
Padding = PKCS7

It comes as a POST to my script.

What I have so far is:

$encrypted = $_POST;

foreach ($encrypted as $k => $v) {
    $encrypted = trim($k);
}

$myKey = "FKQ5sTfotEDF7W07IpvyPFZ0IXeegs4b";

$myIV = "RFajS7JcDJDuAGAT"

$crypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_128, $myKey, $encrypted , MCRYPT_MODE_CBC, $myIV);

echo $crypttext;

Doesn't work. What am I missing here?

Answer 1

From the way you are calling $_POST it looks like you want the raw post data. the $_POST variable contains an array of posted key=>value pairs. You should use

$encrypted = file_get_contents("php://input");

Reference: http://us.php.net/manual/en/wrappers.php.php