PHP AES encrypt / decrypt

Question

Hi,

I found an example for en/decoding strings in PHP. At first it looks very good but it wont work :-(

Does anyone know the Problem with it?

<?php


$Pass = "Passwort";
$Clear = "Klartext";


$crypted = fnEncrypt($Clear, $Pass);
echo "Encrypred: ".$crypted."</br>";

$newClear = fnDecrypt($crypted, $Pass);
echo "Decrypred: ".$newClear."</br>";



function fnEncrypt($sValue, $sSecretKey)
{
    return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $sSecretKey, $sDecrypted, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}

function fnDecrypt($sValue, $sSecretKey)
{
    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $sSecretKey, base64_decode($sEncrypted), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}


?>

The result is:

Encrypred: boKRNTYYNp7AiOvY1CidqsAn9wX4ufz/D9XrpjAOPk8=

Decrypred: —‚(ÑÁ ^ yË~F'¸®Ó–í œð2Á_B‰Â—

Answer 1

Here. The problem was that you were not using the arguments, sValue at line 18 and 23.

You were instead using sEncrypted and sDecrypted which, for the scope of the function were undefined.

<?php


$Pass = "Passwort";
$Clear = "Klartext";


$crypted = fnEncrypt($Clear, $Pass);
echo "Encrypred: ".$crypted."</br>";

$newClear = fnDecrypt($crypted, $Pass);
echo "Decrypred: ".$newClear."</br>";



function fnEncrypt($sValue, $sSecretKey)
{
    return trim(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $sSecretKey, $sValue, MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND))));
}

function fnDecrypt($sValue, $sSecretKey)
{
    return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $sSecretKey, base64_decode($sValue), MCRYPT_MODE_ECB, mcrypt_create_iv(mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB), MCRYPT_RAND)));
}


?>