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[Забанили в поиске...] Как исправить ошибку

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Выдается ошибка Fatal error: Call to undefined function hash() in.............../upload/system/library/encryption.php on line 7



final class Encryption {
private $key;
private $iv;
public function __construct($key) {
        $this->key = hash('sha256', $key, true);
$this->iv = mcrypt_create_iv(32, MCRYPT_RAND);
public function encrypt($value) {
return strtr(base64_encode(mcrypt_encrypt(MCRYPT_RIJNDAEL_256, $this->key, $value, MCRYPT_MODE_ECB, $this->iv)), '+/=', '-_,');
public function decrypt($value) {
return trim(mcrypt_decrypt(MCRYPT_RIJNDAEL_256, $this->key, base64_decode(strtr($value, '-_,', '+/=')), MCRYPT_MODE_ECB, $this->iv));
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