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width=300
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2012/omoikane - Most surreptitious</h2>
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<h3>Encodes text as a C program</h3>
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</div>
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<a class="Left" href="../konno/index.html">← 2012/konno</a>
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/omoikane.c">C code</a>
|
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|
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|
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<a class="Right" href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/omoikane.orig.c">Original C</a>
|
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<a class="Right" href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fomoikane%2Findex.html">✓</a>
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<h2 id="author">Author:</h2>
|
||
<ul>
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||
<li>Name: <a href="../../authors.html#Don_Yang">Don Yang</a><br>
|
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Location: <a href="../../location.html#US">US</a> - <em>United States of America</em> (<em>United States</em>)</li>
|
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<!-- BEFORE: 1st line of markdown file: 2012/omoikane/README.md -->
|
||
<h2 id="to-build">To build:</h2>
|
||
<pre><code> make</code></pre>
|
||
<p>There is an alternate version that will read from the compiled file itself, in
|
||
case you don’t have a <code>/dev/urandom</code> file.</p>
|
||
<h2 id="to-use">To use:</h2>
|
||
<pre><code> ./nyaruko [seed.txt] < original.bin > output.c
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bash output.c > key.c
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perl output.c > data.c
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cat key.c data.c > output.c
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cc output.c -o output
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./output > regenerated.bin</code></pre>
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<p><strong>NOTE</strong>: if your OS does not have <code>/dev/urandom</code> then you should specify a seed
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file or use the <a href="#alternate-code">alternate version</a> which reads in the compiled
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binary itself.</p>
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<h2 id="try">Try:</h2>
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||
<pre><code> ./try.sh</code></pre>
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<p>The script <a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/try.sh">try.sh</a> will check if you have perl before trying to use the
|
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perl parts of the script.</p>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>The alternate version will, if no file is specified, read in the compiled binary
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itself rather than trying to open <code>/dev/urandom</code>, which is the default for the
|
||
original entry. This is useful if your system does not have a <code>/dev/urandom</code>
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file and you do not want to specify an extra file.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
|
||
<p>Use <code>nyaruko.alt</code> as you would <code>nyaruko</code> above.</p>
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<h3 id="alternate-try">Alternate try:</h3>
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<p>For the first alternate version:</p>
|
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<pre><code> ./try.alt.sh</code></pre>
|
||
<h2 id="judges-remarks">Judges’ remarks:</h2>
|
||
<p>The judges have nothing to add that has not already been written about in the
|
||
<a href="obfuscation.html">obfuscation.html</a> (requires JavaScript) file! :-)</p>
|
||
<h2 id="authors-remarks">Author’s remarks:</h2>
|
||
<h3 id="usage">Usage</h3>
|
||
<p><code>Nyaruko</code> is a binary to text filter. Given some input on <code>stdin</code>,
|
||
<code>Nyaruko</code> will produce C code that reproduces this input on <code>stdout</code>:</p>
|
||
<pre><code> ./nyaruko < original.bin > output.c
|
||
gcc output.c -o output
|
||
./output > regenerated.bin</code></pre>
|
||
<p>Output is encrypted, but both key and data are included in the output.
|
||
To separate the key from the data, run these commands:</p>
|
||
<pre><code> bash output.c > key.c
|
||
perl output.c > data.c</code></pre>
|
||
<p>The key-less <code>data.c</code> still compiles, but produces a different message
|
||
on <code>stdout</code> instead of the original input. This message is a hint to
|
||
why the code is formatted the way it is.</p>
|
||
<p>To combine the key and data, concatenate them together in either
|
||
order:</p>
|
||
<pre><code> cat key.c data.c > output.c
|
||
cat data.c key.c > output.c</code></pre>
|
||
<p>By default, <code>Nyaruko</code> generates a unique random key for every message,
|
||
using <code>/dev/urandom</code> as the seed. If given an extra command line
|
||
argument, <code>Nyaruko</code> will seed using that file instead of <code>/dev/urandom</code>:</p>
|
||
<pre><code> ./nyaruko seed.txt < input.bin > output.c</code></pre>
|
||
<p>This makes the output key deterministic, allowing the same key to be shared
|
||
across different files. On operating systems that do not have <code>/dev/urandom</code>,
|
||
users should always specify this extra seed argument to avoid indeterministic
|
||
keys, or else use the alternate version which will by default read the compiled
|
||
alternate version itself, which might or might not be deterministic, depending
|
||
on where and how it’s used.</p>
|
||
<h3 id="features">Features</h3>
|
||
<p>Implementation details that make <code>Nyaruko</code> more obfuscated than usual
|
||
programs:</p>
|
||
<ul>
|
||
<li><code>Nyaruko</code> recycles variables and buffers to reduce internal state.
|
||
The variable names are also carefully chosen for mixed-case
|
||
madness.</li>
|
||
<li><code>Nyaruko</code> employs some preprocessor magic to share much of the same
|
||
code and state between the encoder and decoder, and to increase
|
||
occurrences of smileys ;)</li>
|
||
</ul>
|
||
<p>Output code has these features:</p>
|
||
<ul>
|
||
<li>Fits nicely under 80 columns, and does not contain any trigraphs.</li>
|
||
<li>Uses a fairly efficient encoding scheme, better than <code>uuencode</code> for
|
||
files larger than ~13K, and better than <code>base64</code> for files larger
|
||
than 20K.</li>
|
||
<li>Encryption with <a href="https://en.wikipedia.org/wiki/ISAAC_(cipher)">ISAAC</a>, a
|
||
cryptographically secure pseudorandom number generator.</li>
|
||
<li>Trivial 3 language polyglot.</li>
|
||
</ul>
|
||
<p>Code layout is meant to resemble
|
||
<a href="https://en.wikipedia.org/wiki/Nyarlathotep">Nyaruko</a>, also known as
|
||
<code>Nyarlathotep</code>, the Crawling Chaos. The most obvious thing to do with chaos is
|
||
to make a random number generator, and the most obvious thing to do with a
|
||
random number generator is to make
|
||
<a href="https://en.wikipedia.org/wiki/One-time_pad">one-time-pads</a> for encryption.</p>
|
||
<h3 id="compatibility">Compatibility</h3>
|
||
<p><code>Nyaruko</code> has these environment dependencies:</p>
|
||
<ul>
|
||
<li>Requires ASCII character set.</li>
|
||
<li>Assumes <code>sizeof(unsigned int) == 4</code>.</li>
|
||
<li>Best viewed with tab stops set to 8 spaces.</li>
|
||
</ul>
|
||
<p>Output code has the same dependencies, with the additional
|
||
requirement that the compiler must support arbitrarily long string
|
||
literals. Maximum input size that can be encoded while still
|
||
producing standard-compliant output is ~276 bytes for C89, and ~3168
|
||
bytes for C99.</p>
|
||
<p><code>Nyaruko</code> has been to verified to work with these compiler/OS
|
||
combinations:</p>
|
||
<ul>
|
||
<li>gcc 4.4.5 on Linux (32bit and 64bit)</li>
|
||
<li>clang 3.1 on Windows (Cygwin)</li>
|
||
<li>gcc 4.5.3 on Windows (Cygwin)</li>
|
||
<li>gcc 4.5.3 on Windows (MingW)</li>
|
||
<li>gcc 4.3.5 on JSLinux</li>
|
||
<li>tcc 0.9.25 on JSLinux</li>
|
||
</ul>
|
||
<p>Note that on MingW, <code>stdin</code> and <code>stdout</code> are not opened in binary mode by
|
||
default, this means <code>Nyaruko</code> may not faithfully reproduce files on MingW.
|
||
As a workaround, a <code>binmode_main.h</code> is included, so it’s possible to produce
|
||
an encoder that’s binary-clean like this:</p>
|
||
<pre><code> x86_64-w64-mingw32-gcc -include binmode_main.h nyaruko.c -o nyaruko.exe</code></pre>
|
||
<p>The C code produced by the encoder will need to be compiled with the same
|
||
<code>-include binmode_main.h</code> hack if you want its output to faithfully reproduce
|
||
the original binary input.</p>
|
||
<h3 id="notice-to-those-who-wish-for-a-greater-challenge">NOTICE to those who wish for a greater challenge:</h3>
|
||
<p><strong>If you want a greater challenge, don’t read any further</strong>:
|
||
just try to understand the program via the source.</p>
|
||
<p>If you get stuck, come back and read below for additional hints and information.</p>
|
||
<h3 id="extra-files">Extra files</h3>
|
||
<p><a href="obfuscation.html">obfuscation.html</a> - Contains full recording of how the code went from
|
||
blank state to an obfuscated program, gzipped to fit under 1MB. Requires
|
||
JavaScript.</p>
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
<!-- AFTER: last line of markdown file: 2012/omoikane/README.md -->
|
||
|
||
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|
||
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|
||
|
||
<!-- START: this line starts content generated by: bin/output-index-inventory.sh -->
|
||
|
||
<div id="inventory">
|
||
<h1 id="inventory-for-2012omoikane">Inventory for 2012/omoikane</h1>
|
||
</div>
|
||
<h2 id="primary-files">Primary files</h2>
|
||
<ul>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/Makefile">Makefile</a> - entry Makefile</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/binmode_main.h">binmode_main.h</a> - preprocessor hack to set binary mode</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/omoikane.alt.c">omoikane.alt.c</a> - alternate source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/omoikane.orig.c">omoikane.orig.c</a> - original source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/omoikane.c">omoikane.c</a> - entry source code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/try.alt.sh">try.alt.sh</a> - script to try alternate code</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/try.sh">try.sh</a> - script to try entry</li>
|
||
<li><a href="obfuscation.html">obfuscation.html</a> - JavaScript page with full recording of development</li>
|
||
</ul>
|
||
<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
|
||
<li><a href="2012_omoikane.tar.bz2">2012_omoikane.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/.entry.json">.entry.json</a> - entry summary and manifest in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/winner/blob/master/2012/omoikane/.path">.path</a> - directory path from top level directory</li>
|
||
<li><a href="index.html">index.html</a> - this web page</li>
|
||
</ul>
|
||
<hr style="width:10%;text-align:left;margin-left:0">
|
||
<h4>
|
||
Jump to: <a href="#">top</a>
|
||
</h4>
|
||
|
||
<!-- END: next line ends content generated by: bin/output-index-inventory.sh -->
|
||
|
||
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|
||
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|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/after-content.default.html -->
|
||
<!-- START: this line starts content from: inc/footer.inventory.html -->
|
||
|
||
<!--
|
||
|
||
Copyright © 1984-2025 by Landon Curt Noll. All Rights Reserved.
|
||
|
||
You are free to share and adapt this file under the terms of this license:
|
||
|
||
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
|
||
|
||
For more information, see:
|
||
|
||
https://creativecommons.org/licenses/by-sa/4.0/
|
||
|
||
-->
|
||
|
||
<div class="footer">
|
||
|
||
<div id="copyright"><h3>Copyright © 1984-2025 by Landon Curt Noll:
|
||
<a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">Some Rights Reserved</a></h3>
|
||
<p>
|
||
This work is <b>licensed by Landon Curt Noll</b> under
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
|
||
target="_blank"
|
||
rel="license noopener noreferrer"
|
||
style="display:inline-block;">CC BY-SA 4.0</a></b>.
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/cc.png"
|
||
alt="cc inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/by.png"
|
||
alt="person inside circle symbol">
|
||
<img style="height:22px!important;margin-left:3px;vertical-align:text-bottom;"
|
||
src="../../png/sa.png"
|
||
alt="arrow looping back on itself inside circle symbol"><br>
|
||
You should <b>carefully review</b> the
|
||
<b><a href="https://creativecommons.org/licenses/by-sa/4.0/legalcode.en"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">CC BY-SA 4.0 LEGAL CODE</a></b>
|
||
before using the licensed material.<br>
|
||
You may wish to review the
|
||
<b><a href="../../license.html"
|
||
target="_blank"
|
||
rel="license noopener noreferrer">highlights of some of the key features and terms</a></b>
|
||
of <b>CC BY-SA 4.0</b>.<br>
|
||
</p>
|
||
</div>
|
||
|
||
<div id="coda"><h3>Coda</h3>
|
||
<p>
|
||
<a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fwww.ioccc.org%2F2012%2Fomoikane%2Findex.html" rel="nofollow">Nu HTML check this web page</a><br>
|
||
<a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a><br>
|
||
</p>
|
||
</div>
|
||
|
||
</div>
|
||
|
||
<!-- END: this line ends content from: inc/footer.inventory.html -->
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||
|
||
</body>
|
||
</html>
|
||
|
||
<!-- END: this line ends content from: inc/bottom.default.html -->
|