Landon Curt Noll
c457b16358
Renamed `ioccc.ico` to `favicon.ico`. Correctly added use of `favicon.ico` to all constructed HTML headers. Fixed the smart quote in HTML elements problem. Moved HTML "DO NOT EDIT" comments down below at the bottom of the HTML phase 1 section. According to to the Nu Html Checker, a charset attribute on a meta element found after the first 1024 bytes. Changed `bin/md2html.sh` VERSION from "1.1.3 2024-03-28" to "1.2 2024-03-30". Improved `bin/gen-status.sh` to adjust the "status_update" value only when the "contest_status" is changed. Performed a `make www` to perform and test the above under macOS.
315 lines
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315 lines
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<title>1992/nathan - Worst Abuse of the Rules</title>
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<meta name="description" content="1992 IOCCC entry nathan - Worst Abuse of the Rules">
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<meta name="keywords" content="IOCCC, 1992, IOCCC 1992, IOCCC entry, nathan, Worst Abuse of the Rules">
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<div class="header">
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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>1992/nathan - Worst Abuse of the Rules</h2>
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<div class="topnav">
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<a class="Left" href="../marangon/index.html">← marangon</a>
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<a class="Left" href="../index.html">↑ 1992 ↑</a>
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<a class="Left" href="../vern/index.html">vern →</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/nathan/nathan.c">C code</a>
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<a class="Right" href="https://github.com/ioccc-src/temp-test-ioccc/1992/nathan/Makefile">Makefile</a>
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<a class="Right" href="#inventory">Inventory</a>
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<a href="../../index.html">IOCCC Home</a>
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<a href="../../years.html">Winning Entries</a>
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<a href="../../authors.html">People who have won</a>
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<a href="../../location.html">Location of authors</a>
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<a href="../../news.html">IOCCC News</a>
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<a href="../../faq.html#submit">How to enter the IOCCC</a>
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<a href="../../faq.html">FAQ</a>
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<hr>
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<div class="sidenav">
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<a href="../../bugs.html">Bugs & (mis)features</a>
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<a href="../../faq.html#fix_an_entry">Fixing IOCCC entries</a>
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<a href="../../faq.html#fix_web_site">Fixing the web site</a>
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<a href="../../faq.html#fix_author">Fixing author info</a>
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<a href="../../thanks-for-help.html">Thanks for the help</a>
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</div>
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<hr>
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<div class="sidenav">
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<a href="../../judges.html">The IOCCC Judges</a>
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<a href="../../contact.html">Contacting the IOCCC</a>
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<h2 id="author"><a name="author"></a>Author:</h2>
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<ul>
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<li>Name: <a href="../../authors.html#Nathan_Sidwell">Nathan Sidwell</a><br>
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Location: <a href="../../location.html#GB">GB</a> - <em>United Kingdom of Great Britain and Northern Ireland</em> (<em>United Kingdom</em>)
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<br><br></li>
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<h2 id="to-build">To build:</h2>
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<div class="sourceCode" id="cb1"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> all</span></code></pre></div>
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<h2 id="to-use">To use:</h2>
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<div class="sourceCode" id="cb2"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./nathan</span></span>
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<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a><span class="co"># enter some text</span></span></code></pre></div>
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<h2 id="try">Try:</h2>
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<p>To see some other fun uses:</p>
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<div class="sourceCode" id="cb3"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb3-1"><a href="#cb3-1" aria-hidden="true" tabindex="-1"></a><span class="ex">./try.sh</span></span></code></pre></div>
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<h2 id="judges-remarks">Judges’ remarks:</h2>
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<h3 id="warning">WARNING:</h3>
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<p>The judges make no claim as to the strength or security
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of this program. It is likely to be nil, or the next
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best thing to it. Still, you might consider installing
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it in <code>/usr/games/nathan</code>. :-)</p>
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<h3 id="note-from-the-judges-about-the-winning-category">Note from the judges about the winning category::</h3>
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<p>The ‘winning’ category is also open to question. One could say
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that it is a ‘file obfuscator’. One could also say that it
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unintentionally abused the intent of rule #7 (that programs
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should be freely re-distributable). We suspect that the author
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may not have intended to do this, but that is the way things go
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sometimes.</p>
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<p>BTW, ‘abuse of the rules’ entries do not violate the rules.
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Entries that violate the rules are disqualified. Abuse of the
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rules entries are ones that tend to ‘stretch’ the limits and
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take the contest into unexpected territory.</p>
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<h3 id="historical-notes-from-the-judges-about-this-entry">Historical notes from the judges about this entry:</h3>
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<p>The US International Traffic in Arms Regulations controls certain exportations
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going out of the United States. The U.S. Munitions List gives the specific
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categories of restricted exports. Because this entry at one time appeared to
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fall under this restricted category, the judges originally were not able to
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distribute some winning entries outside of the US.</p>
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<p>Nathan Sidwell stated that he was willing to distribute the winning source. To
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read HIS instructions of how to obtain his winning program one was able to run:</p>
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<div class="sourceCode" id="cb4"><pre class="sourceCode sh"><code class="sourceCode bash"><span id="cb4-1"><a href="#cb4-1" aria-hidden="true" tabindex="-1"></a><span class="fu">make</span> nathan</span>
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<span id="cb4-2"><a href="#cb4-2" aria-hidden="true" tabindex="-1"></a><span class="ex">./nathan</span></span></code></pre></div>
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<p>to learn how to get a copy of the code.</p>
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<p>See the 1992/nathan.c file in the
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<a href="../../archive/historic/archive-1992.tar.bz2">archive/historic/archive-1992.tar.bz2</a>
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tarball if you’re interested in this file.</p>
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<h3 id="personal-note-from-chongo">Personal note from chongo:</h3>
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<p>I think the situation showed just how ridiculous US crypto regulations really
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were/are. Certain US federal officials can get away with shipping arms to
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certain nations in apparent violation of US laws, but I personally can’t
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re-distribute a program contest entry to the network!</p>
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<h2 id="authors-remarks">Author’s remarks:</h2>
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<h3 id="program-use">Program use</h3>
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<p>This program is a hello world text encryptor/decryptor. It uses an
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enigma (I think) style encryption algorithm, where the encryption
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key character is modified by a value, determined from the previous
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character. Non-printable characters (those with ASCII values < <code>' '</code>
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or > <code>0x7e</code>) are passed unaltered, thus any kind of file may be
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successfully processed, but if the original is printable, the
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processed file will be too. The input is read from <code>stdin</code>, and the
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output presented to <code>stdout</code>. The key, a text string, is presented as
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a command argument. This is optional, and if omitted, the file is
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self-{de,en}crypted. To specify decryption, a <code>-</code> should be given
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before the key. (Actually encryption and decryption proper inverse
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operations, so you can use decrypt to scramble and encrypt to
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descramble, if you’re perverse.)</p>
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<h3 id="portability-a-little-knowledge-is-a-dangerous-thing">Portability (A little knowledge is a dangerous thing)</h3>
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<p>It’s written in ANSI C, and doesn’t even assume an ASCII character
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set, (it has an array of the characters to convert), so should be
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portable across many platforms. It passes <code>gcc -ansi -pedantic -O -Wall</code> with no warnings (You may get assignment in conditional
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warnings on other platforms though). Because I’ve heard that
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conditional jumps slow down fast processors, I’ve eliminated all
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the <code>if</code>s from the code; indeed, as its only one statement, it should
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compile to one instruction and a suitably designed CISC machine. To
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speed compilation, there is only one statement in the loop, so that
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another scoping level does not need to be opened.</p>
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<p>Being an encryptor/decryptor, you probably want the source code to
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be obfuscated, to hide the algorithm.</p>
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<h3 id="obfuscation">Obfuscation</h3>
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<p>In spite of the fact that it looks like a nice friendly hello world
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program, it isn’t (as documented above). (Short lines have been padded,
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as you’ll find if you look at an encrypted copy of the source.)</p>
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<p>I’ve also named some of the macros from commonly used functions, just to keep
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things muddy. Of course, all the variables are misnamed. The program is kept
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simply (one for statement), by serious overuse of <code>,</code> and <code>?:</code>. These are really
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confusing when used together, nested or put in argument lists (is that a comma
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operator, or argument separator?).</p>
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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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-->
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<h1 id="inventory-for-1992nathan"><a name="inventory"></a>Inventory for 1992/nathan</h1>
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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/1992/nathan/nathan.c">nathan.c</a> - entry source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/Makefile">Makefile</a> - entry Makefile</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/nathan.orig.c">nathan.orig.c</a> - original source</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/try.sh">try.sh</a> - how to run</li>
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<li><a href="1992_nathan.tar.bz2">1992_nathan.tar.bz2</a> - download entry</li>
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</ul>
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<h2 id="secondary-files">Secondary files</h2>
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<ul>
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<li><a href="index.html">index.html</a> - entry home page</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/README.md">README.md</a> - markdown source for index.html</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/.entry.json">.entry.json</a> - description of entry in JSON</li>
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<li><a href="https://github.com/ioccc-src/temp-test-ioccc/blob/master/1992/nathan/.gitignore">.gitignore</a> - list of files that should not be committed under git</li>
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<li><a href=".path">.path</a> - directory path from top directory</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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https://creativecommons.org/licenses/by-sa/4.0/
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-->
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<div class="footer">
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<h2>Copyright and CC BY-SA 4.0 License</h2>
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<p>This file and web page is:</p>
|
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<blockquote><b>Copyright © 1984-2024 by Landon Curt Noll. All Rights Reserved.</b></p></blockquote>
|
||
<p>You are free to share and adapt this file under the terms of this license:</p>
|
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<blockquote><b>Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0)</b></blockquote>
|
||
<p>For more information, see:</p>
|
||
<blockquote><a
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href="https://creativecommons.org/licenses/by-sa/4.0/">https://creativecommons.org/licenses/by-sa/4.0/</a></blockquote>
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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%2F1992%2Fnathan%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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