code: public function decryptByKey($data, $inputKey, $info = null)
      {
          return $this->decrypt($data, false, $inputKey, $info);
      }
docs: Verifies and decrypts data encrypted with [[encryptByKey()]].
  @param string $data the encrypted data to decrypt
  @param string $inputKey the input to use for encryption and authentication
  @param string $info optional context and application specific information, see [[hkdf()]]
  @return bool|string the decrypted data or false on authentication failure
  @see encryptByKey()