mcrypt_decrypt() error change key size

Question

mcrypt_decrypt(): Key of size 15 not supported by this algorithm. Only keys of sizes 16, 24 or 32 supported

How Can I fix this issue? my

Answer 1

I had the same problem, but fixed it with this

public function setKey($key) {
    $len = strlen($key);
    if($len < 24 && $len != 16){
        $key = str_pad($key, 24, "\0", STR_PAD_RIGHT); 
    } elseif ($len > 24 && $len < 32) {
        $key = str_pad($key, 32, "\0", STR_PAD_RIGHT);       
    }elseif ($len > 32){
        $key = substr($key, 0, 32);
    }
    $this->key = $key;
 }