yii\base\Security::decrypt PHP Метод

    protected function decrypt($data, $passwordBased, $secret, $info)
    {
        if (!extension_loaded('openssl')) {
            throw new InvalidConfigException('Encryption requires the OpenSSL PHP extension');
        }
        if (!isset($this->allowedCiphers[$this->cipher][0], $this->allowedCiphers[$this->cipher][1])) {
            throw new InvalidConfigException($this->cipher . ' is not an allowed cipher');
        }
        list($blockSize, $keySize) = $this->allowedCiphers[$this->cipher];
        $keySalt = StringHelper::byteSubstr($data, 0, $keySize);
        if ($passwordBased) {
            $key = $this->pbkdf2($this->kdfHash, $secret, $keySalt, $this->derivationIterations, $keySize);
        } else {
            $key = $this->hkdf($this->kdfHash, $secret, $keySalt, $info, $keySize);
        }
        $authKey = $this->hkdf($this->kdfHash, $key, null, $this->authKeyInfo, $keySize);
        $data = $this->validateData(StringHelper::byteSubstr($data, $keySize, null), $authKey);
        if ($data === false) {
            return false;
        }
        $iv = StringHelper::byteSubstr($data, 0, $blockSize);
        $encrypted = StringHelper::byteSubstr($data, $blockSize, null);
        $decrypted = openssl_decrypt($encrypted, $this->cipher, $key, OPENSSL_RAW_DATA, $iv);
        if ($decrypted === false) {
            throw new \yii\base\Exception('OpenSSL failure on decryption: ' . openssl_error_string());
        }
        return $decrypted;
    }