Digital Signatures in Adobe Forms (Non-Interactive)

[Former Member]

Hi everyone,

I need to sign a receipt that will be sent by e-mail. The form is non-interactive, it´s only a simple receipt. This form may be printed or sent by e-mail; in case of being sent it must be signed before sending it. The receiver should be able to open it using Adobe Reader.

I´ve read other posts/help about singatures in Adobe Forms, but none of them of non-interactive forms; I need to know if it is possible to do this if the form is not interactive, and how it can be done.

Thanks!

Pablo

[markus_meisl · Accepted solution]

Hi Pablo,

if you want to sign the PDF before sending it (an action called certification of a form, which would be on done the server), you will essentially turn your non-interactive form into an interactive one. Every signature to be applied, whether by an end user on the frontend or by the server, requires a signature field, which by definition is an interactive field. In the case of a server-side signature, it would usually be an invisible field.

Using an interactive field on a form would have an effect on the licensing of the solution (in custom scenarios, the Adobe-based forms solution requires a separate license to be purchased through SAP).

Best regards,

Markus Meisl

[Former Member · Accepted solution]

Thanks Markus...

Now, in that case, is it possible to sign the document automatically without any action from the user?

In my case, when the user decides to send the receipt by e-mail, how can I make the system to sign the document automatically? I need the document to be signed without any action from the user.

Best Regards,

Pablo

[markus_meisl · Accepted solution]

Yes, you can, if you create the necessary application logic (there is no standard NetWeaver mechanism to do this). Read the section in the documentation: <a href="http://help.sap.com/saphelp_nw2004s/helpdata/en/18/ecb69017ad4765855425b97f666470/frameset.htm">Digital Signatures and Certification in Forms</a>

Best.

Markus

[Former Member · Accepted solution]

Yes, I´ve read that already... but it doesn´t explain how to sign the document; there is no clear explanation of the technical way to do so.

Should I call a function inside my program before sending the document? Or just by inserting a signature field the document will be signed automatically? I know that there must be something missing... but I just can´t find it in the HELP from ADS.

Do you know how to do this? Con you send me an example or a link with a more detailed description?

I have also read the way to do it with SSF, but I understand that I don´t have to use SSF for ADS... is this correct?

Thank you very much!

Pablo

[markus_meisl · Accepted solution]

Hi Pablo

the link I provided is the only documentation available on the topic. I am not aware of any comprehensive examples apart from the corresponding FP* program, which is a NetWeaver program, not an application one. No SAP application ships processes using this technology at this point.

You do not need SSF for signing with the Adobe-based solution.

On a high level (and I have no more details): You need to place a signature field on the form. You need to set up a Public Key Infrastructure with certificates (see general Security documentation). You need to write a program that generates the form, then calls the server, which signs the form with its default certificate on the generated form, then attaches the signed PDF to a mail (sent through, for example, the Business Communcation Services of SAP NetWeaver AS.

Best

Markus

[Former Member · Accepted solution]

Markus, thanks for your answer.

I've found an example on signing PDF documents: FP_PDF_TEST_07. I will use it as a base for my application.

Regards,

Pablo Garcí

[Former Member · Accepted solution]

hello pablo

could you forward me FP_PDF_TEST_07

[Former Member · Accepted solution]

Hi Jinal,

Here it goes:

report fp_pdf_test_07.
* set signature

class cl_fp definition load.

selection-screen begin of block s_files with frame title text-100.
  parameters: p_pdf(64)    type c lower case obligatory,
              p_out(64)    type c lower case obligatory.
selection-screen end of block s_files.
selection-screen begin of block s_conn with frame title text-101.
  parameters: p_dest       type rfcdest default 'ADS' obligatory.
selection-screen end of block s_conn.
selection-screen begin of block s_sig with frame title text-102.
  parameters: s_key(64)    type c lower case,
              s_field(64)  type c lower case,
              s_reason(64) type c lower case,
              s_loc(64)    type c lower case,
              s_cinfo(64)  type c lower case.
selection-screen end of block s_sig.

types: ty_raw(255) type x,
       ty_tab type standard table of ty_raw.

data: l_filename_pdf   type string,
      l_filename_out   type string,
      l_fp             type ref to if_fp,
      l_pdfobj         type ref to if_fp_pdf_object,
      l_pdf            type xstring,
      l_out            type xstring,
      l_fpex           type ref to cx_fp_runtime.

  l_filename_pdf = p_pdf.
  l_filename_out = p_out.

  perform load_file using    l_filename_pdf
                    changing l_pdf.

* get FP reference
  l_fp = cl_fp=>get_reference( ).

  try.
*   create PDF Object
    l_pdfobj = l_fp->create_pdf_object( connection = p_dest ).

*   set document
    call method l_pdfobj->set_document
      exporting
        pdfdata = l_pdf.

*   set signature
    call method l_pdfobj->set_signature
      exporting
        keyname     = s_key
        fieldname   = s_field
        reason      = s_reason
        location    = s_loc
        contactinfo = s_cinfo.

*   execute, call ADS
    call method l_pdfobj->execute( ).

*   get result -> l_out
    call method l_pdfobj->get_document
      importing
        pdfdata = l_out.

  catch cx_fp_runtime_internal into l_fpex.
    perform error using l_fpex 'INTERNAL ERROR'.
  catch cx_fp_runtime_system into l_fpex.
    perform error using l_fpex 'SYSTEM ERROR'.
  catch cx_fp_runtime_usage into l_fpex.
    perform error using l_fpex 'USAGE ERROR'.
  endtry.

  check l_fpex is initial.

* download PDF
  data: l_len      type i,
        l_tab      type tsfixml.

  call function 'SCMS_XSTRING_TO_BINARY'
    exporting
      buffer                = l_out
    importing
      output_length         = l_len
    tables
      binary_tab            = l_tab.
  call method cl_gui_frontend_services=>gui_download
    exporting
       bin_filesize            = l_len
       filename                = l_filename_out
       filetype                = 'BIN'
    changing
       data_tab                = l_tab
    exceptions
       others                  = 1.
  if sy-subrc = 0.
    write:/ 'Datei erfolgreich geschrieben'(001).
  else.
    write:/ 'Fehler beim Schreiben der Datei'(002).
  endif.

form error using p_fpex type ref to cx_fp_runtime
                 p_str  type string.
data: l_errcode  type i,
      l_errmsg   type string,
      l_string   type string.

  write:/ '***************************************************'.
  write:/ '***', p_str.
  write:/ '***************************************************'.
  skip 2.

  call method p_fpex->get_errall
    importing
      errcode  = l_errcode
      errmsg   = l_errmsg.

  write:/ 'ERROR CODE       : ', l_errcode.
  write:/ 'ERROR MESSAGE    : ', l_errmsg.

  l_string = p_fpex->get_text( ).
  write:/ l_string.

endform.


form load_file using    p_filename type string
               changing p_content  type xstring.
data: l_rawtab type ty_tab,
      l_len    type i.

  call method cl_gui_frontend_services=>gui_upload
    exporting
      filename                = p_filename
      filetype                = 'BIN'
    importing
       filelength             = l_len
    changing
      data_tab                = l_rawtab
    exceptions
      file_open_error         = 1
      file_read_error         = 2
      no_batch                = 3
      gui_refuse_filetransfer = 4
      invalid_type            = 5
      no_authority            = 6
      unknown_error           = 7
      bad_data_format         = 8
      header_not_allowed      = 9
      separator_not_allowed   = 10
      header_too_long         = 11
      unknown_dp_error        = 12
      access_denied           = 13
      dp_out_of_memory        = 14
      disk_full               = 15
      dp_timeout              = 16
      not_supported_by_gui    = 17
      error_no_gui            = 18
      others                  = 19.
  if sy-subrc <> 0.
    message id sy-msgid type sy-msgty number sy-msgno
               with sy-msgv1 sy-msgv2 sy-msgv3 sy-msgv4.
  endif.

  perform convert_tab_to_x using    l_rawtab l_len
                           changing p_content.

endform.


form convert_tab_to_x using    p_rawtab type ty_tab
                               p_len    type i
                      changing p_xstr   type xstring.
data: l_line  type ty_raw,
      l_count type i,
      l_len   type i,
      l_rest  type i.

  describe table p_rawtab lines l_count.

  loop at p_rawtab into l_line.
    if sy-tabix = l_count.
      l_rest = p_len - l_len.
      concatenate p_xstr l_line(l_rest) into p_xstr in byte mode.
    else.
      concatenate p_xstr l_line into p_xstr in byte mode.
      add 255 to l_len.
    endif.
  endloop.

endform.

Good Luck!

Pablo

[former_member220364]

This message was moderated.

[Former Member]

Hola Pablo,

I know that this is an old post. But I have to do the same thing that you did.

Do you remember the solution that you applied?

thank you,

Pasquale.

[Former Member]

Hello,

Please anyone can help me include automatically (in the server-side) digital signature in pdf Forms (using the Adobe Document Service). I know this is possible but I can’t find any documentation about the system configuration.

thanks

Nuno Abrantes