mcrypt_decrypt(): Key of size 25 not supported by this algorithm

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class Safe_encrypt {
var $skey = “”; // you can change it

public function __construct($skey=’SuPerEncKey_weblink_india’)
{
$this->skey=$this->pad_key($skey);
}

protected function pad_key($key){
// key is too large
if(strlen($key) > 32) return false;

// set sizes
$sizes = array(16,24,32);

// loop through sizes and pad key
foreach($sizes as $s){
while(strlen($key) < $s) $key = $key.”\0″;
if(strlen($key) == $s) break; // finish if the key matches a size
}

// return
return $key;
}

public function safe_b64encode($string) {

$data = base64_encode($string);
$data = str_replace(array(‘+’,’/’,’=’),array(‘-‘,’_’,”),$data);
return $data;
}

public function safe_b64decode($string) {
$data = str_replace(array(‘-‘,’_’),array(‘+’,’/’),$string);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr(‘====’, $mod4);
}
return base64_decode($data);
}

public function encode($value){

if(!$value){return false;}
$text = $value;
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$crypttext = mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->skey, $text, MCRYPT_MODE_ECB, $iv);
return trim($this->safe_b64encode($crypttext));
}

public function decode($value){

if(!$value){return false;}
$crypttext = $this->safe_b64decode($value);
$iv_size = mcrypt_get_iv_size(MCRYPT_RIJNDAEL_256, MCRYPT_MODE_ECB);
$iv = mcrypt_create_iv($iv_size, MCRYPT_RAND);
$decrypttext = mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->skey, $crypttext, MCRYPT_MODE_ECB, $iv);
return trim($decrypttext);
}
}