Landon Curt Noll
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<img src="../../png/ioccc.png" alt="IOCCC image by Matt Zucker" width=300 height=110>
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<h1>The International Obfuscated C Code Contest</h1>
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<h2>2020/kurdyukov1 - Best utility</h2>
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<div class="navbar">
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<a class="Left" href="../giles/index.html">← giles</a>
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<a class="Left" href="../index.html">↑ 2020 ↑</a>
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<a class="Left" href="../kurdyukov2/index.html">kurdyukov2 →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<h2 id="author">Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Ilya_Kurdyukov">Ilya Kurdyukov</a><br>
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Location: <a href="../../location.html#RU">RU</a> - <em>Russian Federation</em> (<em>Russia</em>)</li>
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<h2 id="to-build">To build:</h2>
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<pre><code> make</code></pre>
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<p>There are alternate versions of this entry. See <a href="#alternate-code">Alternate
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code</a> below for more details.</p>
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<h2 id="to-use">To use:</h2>
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<pre><code> ./prog
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# input some text
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echo text | ./prog
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./prog < file</code></pre>
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<h2 id="try">Try:</h2>
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<pre><code> ./try.sh</code></pre>
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<h2 id="alternate-code">Alternate code:</h2>
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<p>There are a number of alternate versions for this program, some in C and some in
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assembly.</p>
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<p>The file <a href="prog.alt.c">prog.alt.c</a> is smaller and does not contain any
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headers or any workaround for WIN32 based platforms.</p>
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<p>The file <a href="prog.extra.c">prog.extra.c</a> has a number of layouts including some for
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different social media profile covers as well as different shapes.</p>
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<p>The files <a href="prog.x86_64.asm">prog.x86_64.asm</a> and <a href="prog.x86.asm">prog.x86.asm</a>
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are the program in assembly for x86_64 linux and x86 linux respectively.</p>
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<h3 id="alternate-build">Alternate build:</h3>
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<p>To build <a href="prog.alt.c">prog.alt.c</a>:</p>
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<pre><code> make alt</code></pre>
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<h3 id="alternate-use">Alternate use:</h3>
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<p>Use <code>prog.alt</code> as you would <code>prog</code> above.</p>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<p>This hash of a C code makes a hash out of input.
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Do you understand how?
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You should get a-round-to-it figuring it out!</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="md5-with-integers">MD5 with integers</h3>
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<p>Just a tiny MD5 checksum utility. Prints hash string of data from <code>stdin</code>.
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Works the same as <code>openssl md5 | cut -d' ' -f2</code> command.</p>
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<h3 id="my-objectives">My objectives</h3>
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<ol type="1">
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<li>Reduce code size as much as possible.</li>
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<li>Avoid warnings from gcc/clang <code>-Wall -Wextra -pedantic</code>.</li>
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<li>Portable (regardless of register size and endianness).</li>
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<li>Fit code in a round shape.</li>
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<li>Mo macro defines.</li>
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<li>No floating-point arithmetics.</li>
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</ol>
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<h3 id="notes">Notes</h3>
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<p>The main difficulty of making MD5 code smaller is a 64x4 bytes long table with
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constants which will take more than 512 bytes in hex encoding. This table is a
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results of a sine function, so can be generated dynamically, but merging
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floating-point arithmetics with precise integer calculations is not a great
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idea, because it can cause portability issues.</p>
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<p>Attempts to satisfy <code>clang -Weverything</code> will ruin comma magic, that is so great
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for obfuscation, so I don’t want to care about that.</p>
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<p>Probably, should work correctly on any machines, but I have nothing exotic (like
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BE or not 32/64) to try it.</p>
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<p>Added a macro hack to make <code>stdin</code> work in binary mode under Windows (tested
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under mingw64), otherwise the hashes can be incorrect.</p>
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<h3 id="bonus">Bonus</h3>
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<ul>
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<li><p><a href="prog.extra.c">prog.extra.c</a> is the same with the sine function (so smaller),
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and in different shapes.</p></li>
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<li><p><a href="prog.x86_64.asm">prog.x86_64.asm</a> contains the same program, but written in
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assembly for x86_64 Linux, for the sake of smaller executable size which is 500
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bytes long (where 120 is for the ELF headers) after compilation. Algorithm
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details is slightly different (like constants packing), just to make smaller
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binary code. It’s interesting to compare density of binary code and obfuscated</p></li>
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</ul>
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<ol start="3" type="A">
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<li></li>
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</ol>
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<ul>
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<li><a href="prog.x86.asm">prog.x86.asm</a> is for x86, although the headers are smaller, but
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the binary code is larger due to fewer registers and lack of 64-bit multiply.</li>
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</ul>
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||
<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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<div id="inventory">
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<h1 id="inventory-for-2020kurdyukov1">Inventory for 2020/kurdyukov1</h1>
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</div>
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<p><a href="#top">Jump to top</a></p>
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<h2 id="primary-files">Primary files</h2>
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||
<ul>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.c">prog.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.alt.c">prog.alt.c</a> - alternative source</li>
|
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.orig.c">prog.orig.c</a> - original source</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/try.sh">try.sh</a> - how to run</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.extra.c">prog.extra.c</a> - variant of entry source with sine function</li>
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||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.x86_64.asm">prog.x86_64.asm</a> - assembly source code</li>
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||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/prog.x86.asm">prog.x86.asm</a> - assembly source code</li>
|
||
</ul>
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<h2 id="secondary-files">Secondary files</h2>
|
||
<ul>
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||
<li><a href="2020_kurdyukov1.tar.bz2">2020_kurdyukov1.tar.bz2</a> - download entry tarball</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/README.md">README.md</a> - markdown source for this web page</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/.entry.json">.entry.json</a> - description of entry in JSON</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
|
||
<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/2020/kurdyukov1/.path">.path</a> - directory path from top directory</li>
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||
<li><a href="index.html">index.html</a> - this web page</li>
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||
</ul>
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<!--
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Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.
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You are free to share and adapt this file under the terms of this license:
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Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)
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For more information, see:
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<p>All IOCCC content including this file and web page are:</p>
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<b> Copyright © 1984-2024 by Landon Curt Noll. <a href="https://creativecommons.org/faq/#what-does-some-rights-reserved-mean">Some Rights Reserved</a>.</b>
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<p>This work is licensed by Landon Curt Noll under:</p>
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<p><b><a href="https://creativecommons.org/licenses/by-sa/4.0/?ref=chooser-v1"
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target="_blank" rel="license noopener noreferrer" style="display:inline-block;"> CC BY-SA 4.0
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<h2>Coda</h2>
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<p><a href="https://validator.w3.org/nu/?doc=https%3A%2F%2Fioccc-src.github.io%2Ftemp-test-ioccc%2F2020%2Fkurdyukov1%2Findex.html">Nu HTML check this web page</a></p>
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<p><a href="#top">Jump to top</a> <a href="#content">Jump to Content</a> <a href="#inventory">Jump to Inventory</a></p>
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