x-lf-md5
: base64(MD5("key1=value1&key2=value2&secret))
('key=', 'xGl64jNW4B223SSDAsddgh=n')
('data=', 'imsi=8900000000000010&partner_code=P002671&received_at=2022-01-19T201101&sim_id=89000000000001&text_message=device status: 1234‘)
('dataToSign=', 'imsi=8900000000000010&partner_code=P002671&received_at=2022-01-19T201101&sim_id=89000000000001&text_message=device status: 1234&xGl64jNW4B223SSDAsddgh=n')
('md5 result=', 'YjExZmMwNTdiZGVmNGMzZjUzYTVhMjExZWExODI4ODY=')