Using SAP Abap class CL_ABAP_MESSAGE_DIGEST to get sha256

[tuliovargas]

Hi experts,

I was wondering why I am getting a different result from a zip file when I try to convert it to hash SHA256.

I am using the function CALCULATE_HASH_FOR_CHAR and class CL_ABAP_MESSAGE_DIGEST to obtain the hash from a file, it is working when I test it using a simples file text.txt; however, when I zip the text.txt then the hash expected is coming with a wrong hash.

test.txt

content: test123

Expected hash: 56a7010456b474aeee111f3b7336581fb0a99129d426cf51903efbdfd629f008

Result: 56A7010456B474AEEE111F3B7336581FB0A99129D426CF51903EFBDFD629F008

TEST.zip

expected hash: da03ff10b45774ad1890d060575c48fc86842c9616410ec2c40f19227780fa63

Result: B0AEEA3B970589317B485F21BBF8AF6D0AD40DAF0758DB8F071219EFBC7108E3

*DATA itab TYPE TABLE OF string .
CALL FUNCTION 'GUI_UPLOAD'
  EXPORTING
    filetype = 'ASC'
    filename = 'C:\file\TEST.zip'
  TABLES
    data_tab = itab.
data lt_concat TYPE string.
concatenate lines of itab into LT_CONCAT.
TRY.
    lo_digest = cl_abap_message_digest=>get_instance( 'sha-256' ).
    "update digest with input
    converter = cl_abap_conv_out_ce=>create( ).
    converter->convert(
      EXPORTING
        data   = lt_concat
      IMPORTING
        buffer = data_as_xstring
    ).
    lo_digest->update( if_data = data_as_xstring ).
    "finalise digest
    lo_digest->digest( ).
    hash_value = lo_digest->TO_STRING( ).
  CATCH cx_abap_message_digest.
    CLEAR hash_value.
  CATCH cx_sy_codepage_converter_init
        cx_sy_conversion_codepage
        cx_parameter_invalid_type.
    CLEAR hash_value.
ENDTRY.

[touzik_itc]

I suppose, because you uploading binary file as a ASCII file, try filetype = 'BIN'.

[tuliovargas]

Thanks touzik_itc