Posted: Mon Feb 25, 2008 1:37 pm Post subject: Showing crypting technique using Cesar's ROT-13 Algorithm
Code:
report zexp_rot13 no standard page heading line-size 100.
***********************************************************
* Showing simple crypting technique using Cesar's ROT-13 Algorithm
*
* This is freeware. Please read the terms of use.
* Written by Urs Rohner, Rohner IT Consulting & Engineering
*
* Contact Author: Urs Rohner
*
* History
*
* Vers Date Own Remarks
* ---- ------------------ --- --------------------------------------
* 1.00 26th February 2001 rnr Initial version
* 1.01 30th August 2001 rnr Minor changes
*
***********************************************************
parameters:
_t(100) type c lower case default
'The quick brown fox jumps over the lazy Dog. 26th February 2001'.
* Method: m_crypt>
* Crypt a string using Ceasar's Rot-13 Algorithm, Digits by Rot-5
* Additionally, characters are swapped (1st to Last)
define m_crypt>.
perform m_crypt using &1.
end-of-definition.
form m_crypt using t_.
data:
_c type c,
_i type i,
_l type i,
_a type i,
_o type i.
describe field t_ type _c.
if _c eq 'C'. " crypt only on character fields
" swap string
_l = strlen( t_ ).
_i = _l div 2.
do _i times.
_a = sy-index - 1.
_o = _l - sy-index.
" swap char
_c = t_+_a(1).
t_+_a(1) = t_+_o(1).
t_+_o(1) = _c.
enddo.
" do ROT-13/ROT-5 cryption
translate t_ using
'ANBOCPDQERFSGTHUIVJWKXLYMZNAOBPCQDRESFTGUHVIWJXKYLZM' &
'anbocpdqerfsgthuivjwkxlymznaobpcqdresftguhviwjxkylzm' &
'05162738495061728394'.
endif.
endform.
*
* P A I ( )
*
start-of-selection.
write / _t.
m_crypt> _t.
write / _t.
m_crypt> _t.
write / _t.
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