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PUBLIC
CREATE PUBLIC .
PUBLIC SECTION.
CLASS-METHODS adler32
IMPORTING
!iv_xstring TYPE xstring
RETURNING
VALUE(rv_checksum) TYPE zif_abapgit_git_definitions=>ty_adler32 .
CLASS-METHODS sha1
IMPORTING
!iv_type TYPE zif_abapgit_git_definitions=>ty_type
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_commit
IMPORTING
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_tree
IMPORTING
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_tag
IMPORTING
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_blob
IMPORTING
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_raw
IMPORTING
!iv_data TYPE xstring
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
CLASS-METHODS sha1_string
IMPORTING
!iv_data TYPE string
RETURNING
VALUE(rv_sha1) TYPE zif_abapgit_git_definitions=>ty_sha1
RAISING
zcx_abapgit_exception .
PROTECTED SECTION.
PRIVATE SECTION.
ENDCLASS.
CLASS zcl_abapgit_hash IMPLEMENTATION.
METHOD adler32.
CONSTANTS: lc_adler TYPE i VALUE 65521,
lc_max_b TYPE i VALUE 1800000000.
DATA: lv_index TYPE i,
lv_a TYPE i VALUE 1,
lv_b TYPE i VALUE 0,
lv_x TYPE x LENGTH 2,
lv_ca TYPE c LENGTH 4,
lv_cb TYPE c LENGTH 4,
lv_char8 TYPE c LENGTH 8.
DO xstrlen( iv_xstring ) TIMES.
lv_index = sy-index - 1.
lv_a = lv_a + iv_xstring+lv_index(1).
lv_b = lv_b + lv_a.
* delay the MOD operation until the integer might overflow
* articles describe 5552 additions are allowed, but this assumes unsigned integers
* instead of allowing a fixed number of additions before running MOD, then
* just compare value of lv_b, this is 1 operation less than comparing and adding
IF lv_b > lc_max_b.
lv_a = lv_a MOD lc_adler.
lv_b = lv_b MOD lc_adler.
ENDIF.
ENDDO.
lv_a = lv_a MOD lc_adler.
lv_b = lv_b MOD lc_adler.
lv_x = lv_a.
lv_ca = lv_x.
lv_x = lv_b.
lv_cb = lv_x.
CONCATENATE lv_cb lv_ca INTO lv_char8.
rv_checksum = lv_char8.
ENDMETHOD.
METHOD sha1.
DATA: lv_len TYPE i,
lv_char10 TYPE c LENGTH 10,
lv_string TYPE string,
lv_xstring TYPE xstring.
lv_len = xstrlen( iv_data ).
lv_char10 = lv_len.
CONDENSE lv_char10.
CONCATENATE iv_type lv_char10 INTO lv_string SEPARATED BY space.
lv_xstring = zcl_abapgit_convert=>string_to_xstring_utf8( lv_string ).
lv_string = lv_xstring.
CONCATENATE lv_string '00' INTO lv_string.
lv_xstring = lv_string.
CONCATENATE lv_xstring iv_data INTO lv_xstring IN BYTE MODE.
rv_sha1 = sha1_raw( lv_xstring ).
ENDMETHOD.
METHOD sha1_blob.
rv_sha1 = sha1( iv_type = zif_abapgit_git_definitions=>c_type-blob
iv_data = iv_data ).
ENDMETHOD.
METHOD sha1_commit.
rv_sha1 = sha1( iv_type = zif_abapgit_git_definitions=>c_type-commit
iv_data = iv_data ).
ENDMETHOD.
METHOD sha1_raw.
DATA: lv_hash TYPE string,
lv_key TYPE xstring,
lx_error TYPE REF TO cx_abap_message_digest.
TRY.
cl_abap_hmac=>calculate_hmac_for_raw(
EXPORTING
if_key = lv_key
if_data = iv_data
IMPORTING
ef_hmacstring = lv_hash ).
CATCH cx_abap_message_digest INTO lx_error.
zcx_abapgit_exception=>raise_with_text( lx_error ).
ENDTRY.
rv_sha1 = lv_hash.
TRANSLATE rv_sha1 TO LOWER CASE.
ENDMETHOD.
METHOD sha1_string.
DATA: lv_hash TYPE string,
lv_key TYPE xstring,
lx_error TYPE REF TO cx_abap_message_digest.
TRY.
cl_abap_hmac=>calculate_hmac_for_char(
EXPORTING
if_key = lv_key
if_data = iv_data
IMPORTING
ef_hmacstring = lv_hash ).
CATCH cx_abap_message_digest INTO lx_error.
zcx_abapgit_exception=>raise_with_text( lx_error ).
ENDTRY.
rv_sha1 = lv_hash.
TRANSLATE rv_sha1 TO LOWER CASE.
ENDMETHOD.
METHOD sha1_tag.
rv_sha1 = sha1( iv_type = zif_abapgit_git_definitions=>c_type-tag
iv_data = iv_data ).
ENDMETHOD.
METHOD sha1_tree.
rv_sha1 = sha1( iv_type = zif_abapgit_git_definitions=>c_type-tree
iv_data = iv_data ).
ENDMETHOD.
ENDCLASS.
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