签名算法
app_key和app_secret由对方系统提供

MD5_CALCULATE_HASH_FOR_CHAR（中文加密与JAVA不一致）
代码：

*获取传输字段名的ASCII码，根据ASCII码对字段名进行排序

    SELECT * FROM zthr0051
      WHERE  functionid = @iv_functionid
     INTO CORRESPONDING FIELDS OF TABLE @et_sort.

    LOOP AT et_sort INTO DATA(es_sort).
      es_sort-ascii = cl_abap_conv_out_ce=>uccpi( es_sort-f_json ).
      MODIFY et_sort FROM es_sort.
      CLEAR:es_sort.
    ENDLOOP.
    SORT et_sort BY ascii.
    
*接口参数赋值
    gs_per_input-timestamp = gv_timestamp+0(10).
    gs_per_input-app_key = ls_zthr0167-zkey.
    gs_per_input-person_no = gs_out_pernr-personid_ext.
    gs_per_input-name      = gs_out_pernr-ename.
    IF gs_out_pernr-sex = '1'.
      gs_per_input-gender = 'MAN'.
    ELSEIF  gs_out_pernr-sex = '2'.
      gs_per_input-gender = 'WOMEN'.
    ELSEIF  gs_out_pernr-sex = '其他'.
      gs_per_input-gender = 'OTHER'.
    ENDIF.
    gs_per_input-phone = gs_per_input-phone.
    gs_per_input-card_department_group_id = gs_out_pernr-department_id.
    
 *参数拼接
      LOOP AT gt_sort001 ASSIGNING FIELD-SYMBOL(<fs_sort001>) WHERE f_abap <> 'SIGNATURE'.
        ASSIGN COMPONENT <fs_sort001>-f_ABAP OF STRUCTURE gs_per_input TO <field>.
        IF <field> IS NOT INITIAL.
          lv_input = lv_input && <fs_sort001>-f_json && '=' && <field> && '&'.
        ENDIF.
        AT LAST.
          lv_input = lv_input && 'key=' && ls_zthr0167-secret.
        ENDAT.
      ENDLOOP.
*对拼接后的值进行MD5加密后的值放在接口参数中，并转换为大写，传输
    CALL FUNCTION 'ZFM_GET_MD5'
      EXPORTING
        iv_string = lv_input
      IMPORTING
        ev_md5    = gs_per_input-signature.
    TRANSLATE gs_per_input-signature TO UPPER  CASE.

MD5加密参考