code: def import_identity(self, label: str, encrypted_pri_key: str, pwd: str, salt: str, b58_address: str) -> Identity:
          
          scrypt_n = Scrypt().n
          pri_key = Account.get_gcm_decoded_private_key(encrypted_pri_key, pwd, b58_address, salt, scrypt_n, self.scheme)
          info = self.__create_identity(label, pwd, salt, pri_key)
          for identity in self.wallet_in_mem.identities:
              if identity.ont_id == info.ont_id:
                  return identity
          raise SDKException(ErrorCode.other_error('Import identity failed.'))
docs: This interface is used to import identity by providing encrypted private key, password, salt and
          base58 encode address which should be correspond to the encrypted private key provided.
  
          :param label: a label for identity.
          :param encrypted_pri_key: an encrypted private key in base64 encoding from.
          :param pwd: a password which is used to encrypt and decrypt the private key.
          :param salt: a salt value which will be used in the process of encrypt private key.
          :param b58_address: a base58 encode address which correspond with the encrypted private key provided.
          :return: if succeed, an Identity object will be returned.