Well this year i decided to enter the International Obfuscated C Code Contest. This was my first attempt at writing obfuscated C (at least purposely), so I am sure that this is kids-stuff for the real obfuscation gurus. Anyway, the results are out, and I am not a finalist (I wasn't expecting to be), so I figured I would share my code with you all, just for fun. If anyone else made an entry this year, please share them!
Here are the remarks included with my entry:
This program grew out of a non-obfuscated utility that I threw
together a while ago. I use it as a reference from time to
time since different architectures produce different results (at
least, the output is different on my HP-UX box than it is on my
Intel box). It simply outputs a nicely formatted ascii character
table. It is run with no arguments and produces its report on
the standard out. I achieved obfuscation by using a couple of
levels of recursion, plus some confusingly named variables and
functions. I also included some additional code which does
absolutley nothing just to confuse things a little more.
I strived for "-Wall" cleanness. As a result I had to give up
a couple minor obfuscations, but I think it is still sufficiently
convoluted. This is my first attempt at obfuscated C -- it was
written over the course of several weeks as a diversion. By
the end it became very difficult to improve as I could no longer
understand how it worked without a serious amount of thought!
The code is neatly arranged in the form of my initials.
Code:
# include <stdio.h>
# define d (
# define I1 1<<
# define b )
# define Il(l) \
return(l)
# define lI \
I*((I1 3)-1)+(I*(I1\
1))-(I-\
(I1 4))
#define \
_l(l) \
ll_l(l)
#define \
ll(l) l
#define \
l1 main(
long i,l,ll(I)=d(I1 5)-(I1 1)b;int _l(l)
{putchar d ll(l)b;Il(l);}int II(l,L){_l(
(l/L)+48);l-=((l/L)*L);d L/=10 b?II(l,L)
:0;Il(l);}int l1
b{*d d l b?&I:&l
b=I;if d l>(I1 8
b b Il(I1 0);_l(
32);_l(I1 5);II(
l,25<<2);_l(58);
_l(I1 5);_l(ll(l
));l%(I1 2)?0:_l
((I1 3)+(ll(I1 1)
)b;l++;Il(l1 l));
}
ello, I am trying to remove obfuscated code in multiple files on a server, the malicious code is surronded by
/*km0ae9gr6m*//*qhk6sa6g1c*/
I had success removing from some files using this command
sed -i ':strt;s|/\*km0ae9gr6m\*/*/\*qhk6sa6g1c\*/||g;/\/\*km0ae9gr6m\*\//{N;b strt}'... (5 Replies)
I have this following file and I would quite like to get it decoded - any help / advice is appreciated. I would like to know how to decrypt it, however if someone is able to do it for me I would be equally grateful.
<?php
//Obfuscation provided by FOPO - Free Online PHP Obfuscator v1.2:... (6 Replies)
Obfuscated Hello World! in Python 2.7.x
This is seriously impressive:-
Obfuscating "Hello world!" - Ben Kurtovic (2 Replies)
Discussion started by: wisecracker
2 Replies
LEARN ABOUT DEBIAN
cobfusc
COBFUSC(1) BSD General Commands Manual COBFUSC(1)NAME
cobfusc -- make a C source file unreadable but compilable
SYNOPSIS
cobfusc [-AabdemntxV] [-c case] [-f suffix] [-g file] [-i idobf]
[-o file] [-p prefix] [-r file] [-s seed] [-u file] [-w cols]
[-z file] [file ...]
DESCRIPTION
This document contains only a brief description of cobfusc. For a more complete documentation, please read the Info file or the Texinfo man-
ual.
The cobfusc utility converts the input file, written in the C language, into a human unreadable one, but compilable. The main work is con-
verting every identifier into a meaningless one, removing any comment and compacting all the white-spaces when they are not required.
The options are as follows:
-A Enable a heavy obfuscation for the source file. This is equivalent to the -ademt -i numeric options. The digraphize option is not
enabled by default since the Amendement 1 (1994) changes to ANSI X3.159-1989 (``ANSI C89'') are supported only by few C compilers.
-a Garble every string with octal escapes.
-b Enable the digraphize mode.
-c no | lower | upper | screw | random
Set the identifier case obfuscation mode.
-d Compact the macros removing backslashes and white-spaces when they are not required.
-e Compact the white-spaces when they are not required.
-f suffix
Put the output of each processed file in a separate file with suffix appended to file name instead of standard output. This is use-
ful when processing a package with a lot of source files.
-g file
Add first the identifiers contained in file to the obfuscation table. Useful when those identifiers are shared between two or more
source files.
-i no | numeric | word | random
Set the identifier obfuscation mode.
-m Strip the comments.
-n Garble integers with expressions.
-o file
Set the output destination to file.
-p prefix
Specify the prefix to use when generating the identifiers.
-r file
Tell cobfusc that the identifiers contained in file must not be obfuscated.
-s seed
Specify the seed for generating the random numbers.
-t Enable the trigraphize mode.
-u Dump the symbol table to file.
-V Print version information on standard output then exit.
-w Set the width limit of the output.
-x Exclusive mode; obfuscate only the identifiers specified by the -g and -z parameters.
-z file
Add the identifiers pairs contained in file to the obfuscation table.
SEE ALSO cunloop(1), indent(1)AUTHORS
Sandro Sigala <sandro@sigala.it>
BSD July 1, 2001 BSD
03-28-2002
Obfuscated C
