Simple Encryption/Decryption engine

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#1
Code:
if {%$} == {} goto usage
setlocal
*(unset /q * %+ unalias /q * %+ unfunction /q *)

set guest=%$
if %@isxdigit[%guest] == 1 goto decrypt

:ENCRYPT

do x=0 to %@dec[%@words[%guest]]
set x_%[x]=%@word[%x,%guest]
set bits=%@ascii[%[x_%x]]
do y=0 to %@dec[%@words[%bits]]
set bit1=%@convert[10,16,%@eval[%@word[%y,%bits] xor 255]]
set bit2=%bit2%%bit1
enddo
echo Input string: [%[x_%x]]
echo Ouput string: %bit2
if {%[x_%x]} == {} leave
enddo

goto end

:DECRYPT

do f=0 %@dec[%@len[%guest]] by 2
set in=%@char[%@eval[%@convert[16,10,%@instr[%f,2,%guest]] xor 255]]
set out=%out%%in
enddo
echo Input sting: [%guest]
echo Output string %out

:END
endlocal
quit

:USAGE

text

Simple Bitwise Encryption/Decryption

Usage: BitWise String

BitWise determins which way to swing depending on input string.

endtext

: *NOTE* Yahelite Chat client uses this very mild encryption.