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<title>Reviving Caesar with a Cherry-flavored Crystal</title>
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<h1 class="title">Reviving Caesar with a Cherry-flavored Crystal</h1>
<div id="outline-container-org0bff230" class="outline-2">
<h2 id="org0bff230">What ?…</h2>
<div class="outline-text-2" id="text-org0bff230">
<p>
That is probably your reaction reading this title, and no, this isn’t a randomly generated sentence, but rather a simple encryption algorithm I recently made (Actually the first encryption algorithm i make at all!!). Meet <b>Cherry-Crystal Encryption</b>.
</p>
</div>
</div>
<div id="outline-container-org4770304" class="outline-2">
<h2 id="org4770304">Okay so, what is this all about ?</h2>
<div class="outline-text-2" id="text-org4770304">
<p>
This encryption Algorithm that we will call <b>CCE</b> for short, takes inspiration from the Caesar cipher which needn’t an introduction (you can find great explanations online). But what about mine you might ask ?
</p>
<ul class="org-ul">
<li>It’s actually pretty simple. We start with a <b>Cherry</b> or a <b>Visible phrase</b>, or a <b>Decoy</b>, that we will share to people who we don’t want to know the secret phrase..</li>
<li>Then we ask the user to enter their <b>Crystal</b>, <b>invisible phrase</b> or <b>secret</b>.</li>
<li>The program then outputs an array of Integers called the <b>Mask</b>, or the <b>Shift</b>. That is, the shift required to go from cherry<sub>i</sub> to crystal<sub>i</sub>.</li>
<li>Finally, we use both the <b>Cherry</b> and <b>Mask</b> to get the <b>Crystal</b>, a single missing number or letter from both of them can and will output rubbish content.</li>
</ul>
</div>
</div>
<div id="outline-container-org4496ca5" class="outline-2">
<h2 id="org4496ca5">The Code :</h2>
<div class="outline-text-2" id="text-org4496ca5">
<div class="org-src-container">
<pre class="src src-c"><span style="color: #f9e2af;">#include</span> <span style="color: #f38ba8;"><</span><span style="color: #a6e3a1;">stdio.h</span><span style="color: #f38ba8;">></span>
<span style="color: #f9e2af;">#include</span> <span style="color: #f38ba8;"><</span><span style="color: #a6e3a1;">stdlib.h</span><span style="color: #f38ba8;">></span>
<span style="color: #f9e2af;">#include</span> <span style="color: #f38ba8;"><</span><span style="color: #a6e3a1;">string.h</span><span style="color: #f38ba8;">></span>
<span style="color: #f9e2af;">void</span> <span style="color: #89b4fa;">sloth</span><span style="color: #f38ba8;">(</span><span style="color: #f9e2af;">char</span> <span style="color: #cdd6f4;">cherry</span><span style="color: #fab387;">[]</span>, <span style="color: #f9e2af;">char</span> <span style="color: #cdd6f4;">crystal</span><span style="color: #fab387;">[]</span>, <span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">mask</span><span style="color: #fab387;">[]</span><span style="color: #f38ba8;">)</span> <span style="color: #f38ba8;">{</span>
<span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">i</span>;
<span style="color: #cba6f7;">for</span> <span style="color: #fab387;">(</span>i = <span style="color: #fab387;">0</span>; i < strlen<span style="color: #f9e2af;">(</span>cherry<span style="color: #f9e2af;">)</span> - <span style="color: #fab387;">1</span>; i++<span style="color: #fab387;">)</span> <span style="color: #fab387;">{</span>
mask<span style="color: #f9e2af;">[</span>i<span style="color: #f9e2af;">]</span> = cherry<span style="color: #f9e2af;">[</span>i<span style="color: #f9e2af;">]</span> - crystal<span style="color: #f9e2af;">[</span>i<span style="color: #f9e2af;">]</span>;
<span style="color: #fab387;">}</span>
<span style="color: #cba6f7;">for</span> <span style="color: #fab387;">(</span>i = strlen<span style="color: #f9e2af;">(</span>cherry<span style="color: #f9e2af;">)</span> - <span style="color: #fab387;">1</span>; i < strlen<span style="color: #f9e2af;">(</span>crystal<span style="color: #f9e2af;">)</span> - <span style="color: #fab387;">1</span>; i++<span style="color: #fab387;">)</span> <span style="color: #fab387;">{</span>
mask<span style="color: #f9e2af;">[</span>i<span style="color: #f9e2af;">]</span> = crystal<span style="color: #f9e2af;">[</span>i<span style="color: #f9e2af;">]</span>;
<span style="color: #fab387;">}</span>
<span style="color: #f38ba8;">}</span>
<span style="color: #f9e2af;">void</span> <span style="color: #89b4fa;">moon</span><span style="color: #f38ba8;">(</span><span style="color: #f9e2af;">char</span> <span style="color: #cdd6f4;">cherry</span><span style="color: #fab387;">[]</span>, <span style="color: #f9e2af;">char</span> <span style="color: #cdd6f4;">crystal</span><span style="color: #fab387;">[]</span>, <span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">mask</span><span style="color: #fab387;">[]</span>, <span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">length</span><span style="color: #f38ba8;">)</span> <span style="color: #f38ba8;">{</span>
<span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">i</span>, <span style="color: #cdd6f4;">end</span> = <span style="color: #fab387;">1</span>;
<span style="color: #cba6f7;">for</span> <span style="color: #fab387;">(</span>i = <span style="color: #fab387;">0</span>; i < length; i++<span style="color: #fab387;">)</span> <span style="color: #fab387;">{</span>
<span style="color: #cba6f7;">if</span> <span style="color: #f9e2af;">(</span>i == strlen<span style="color: #a6e3a1;">(</span>cherry<span style="color: #a6e3a1;">)</span> - <span style="color: #fab387;">1</span> || end == <span style="color: #fab387;">0</span><span style="color: #f9e2af;">)</span> <span style="color: #f9e2af;">{</span>
crystal<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span> = mask<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span>;
end = <span style="color: #fab387;">0</span>;
<span style="color: #f9e2af;">}</span> <span style="color: #cba6f7;">else</span> <span style="color: #f9e2af;">{</span>
crystal<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span> = cherry<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span> - mask<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span>;
<span style="color: #f9e2af;">}</span>
<span style="color: #fab387;">}</span>
<span style="color: #f38ba8;">}</span>
<span style="color: #f9e2af;">int</span> <span style="color: #89b4fa;">main</span><span style="color: #f38ba8;">(</span><span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">argc</span>, <span style="color: #f9e2af;">char</span> *<span style="color: #cdd6f4;">argv</span><span style="color: #fab387;">[]</span><span style="color: #f38ba8;">)</span> <span style="color: #f38ba8;">{</span>
<span style="color: #cba6f7;">const</span> <span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">size</span> = <span style="color: #fab387;">1028</span>;
<span style="color: #f9e2af;">char</span> <span style="color: #cdd6f4;">cherry</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>, <span style="color: #cdd6f4;">cherry2</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>, <span style="color: #cdd6f4;">crystal</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>, <span style="color: #cdd6f4;">crystal2</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>;
<span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">mask</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>, <span style="color: #cdd6f4;">mask2</span><span style="color: #fab387;">[</span>size<span style="color: #fab387;">]</span>, <span style="color: #cdd6f4;">i</span>;
<span style="color: #f9e2af;">int</span> <span style="color: #cdd6f4;">length</span> = <span style="color: #fab387;">0</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"Enter the Cherry: "</span><span style="color: #fab387;">)</span>;
fgets<span style="color: #fab387;">(</span>cherry, size, stdin<span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"Enter the Crystal: "</span><span style="color: #fab387;">)</span>;
fgets<span style="color: #fab387;">(</span>crystal, size, stdin<span style="color: #fab387;">)</span>;
sloth<span style="color: #fab387;">(</span>cherry, crystal, mask<span style="color: #fab387;">)</span>;
<span style="color: #cba6f7;">for</span> <span style="color: #fab387;">(</span>i = <span style="color: #fab387;">0</span>; i < strlen<span style="color: #f9e2af;">(</span>crystal<span style="color: #f9e2af;">)</span> - <span style="color: #fab387;">1</span>; i++<span style="color: #fab387;">)</span> <span style="color: #fab387;">{</span>
printf<span style="color: #f9e2af;">(</span><span style="color: #a6e3a1;">"%d "</span>, mask<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span><span style="color: #f9e2af;">)</span>;
length++;
<span style="color: #fab387;">}</span>
printf<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"\nYour mask is : %d characters long"</span>, length<span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"\n===Decryption: ===\n"</span><span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"Enter the Cherry: "</span><span style="color: #fab387;">)</span>;
fgets<span style="color: #fab387;">(</span>cherry2, size, stdin<span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"Enter the size of the Mask: "</span><span style="color: #fab387;">)</span>;
scanf<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"%d"</span>, &length<span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"Enter the mask: "</span><span style="color: #fab387;">)</span>;
<span style="color: #cba6f7;">for</span> <span style="color: #fab387;">(</span>i = <span style="color: #fab387;">0</span>; i < length; i++<span style="color: #fab387;">)</span> <span style="color: #fab387;">{</span>
scanf<span style="color: #f9e2af;">(</span><span style="color: #a6e3a1;">"%d"</span>, &mask2<span style="color: #a6e3a1;">[</span>i<span style="color: #a6e3a1;">]</span><span style="color: #f9e2af;">)</span>;
<span style="color: #fab387;">}</span>
puts<span style="color: #fab387;">(</span><span style="color: #a6e3a1;">"The Crystal is: "</span><span style="color: #fab387;">)</span>;
moon<span style="color: #fab387;">(</span>cherry2, crystal2, mask2, length<span style="color: #fab387;">)</span>;
puts<span style="color: #fab387;">(</span>crystal2<span style="color: #fab387;">)</span>;
<span style="color: #cba6f7;">return</span> <span style="color: #fab387;">0</span>;
<span style="color: #f38ba8;">}</span>
</pre>
</div>
<p>
The program has been tested both on Alpine OS with Musl libc (thanks <a href="https://kaa.neocities.org/">Kin</a>) and on OpenBSD 7.5-current. In the close future I will make a git repo as i’m planning to upgrade it and just make it better overall, who knows, maybe i will make a library out of it!!
</p>
</div>
</div>
<div id="outline-container-org6c3305a" class="outline-2">
<h2 id="org6c3305a">How does it work ?</h2>
<div class="outline-text-2" id="text-org6c3305a">
</div>
<div id="outline-container-orgf462a7c" class="outline-3">
<h3 id="orgf462a7c">Slothing (Encrypting) 🦥:</h3>
<div class="outline-text-3" id="text-orgf462a7c">
<p>
<del>What is it with these names I pick ?</del> Anyways, the <b>sloth(char *cherry, char *crystal, int *mask)</b> void function takes as parameters three variables:
</p>
<ul class="org-ul">
<li>A pointer to a <b>char array</b> or simply said <b>a string</b>, It’s the <b>Cherry</b>.</li>
<li>Another pointer to the <b>Crystal</b>.</li>
<li>And Finally, a pointer to an array of integers <b>The Mask</b> which will be output-ed by the function.</li>
</ul>
<p>
The general idea of it is like this : (we will use a quick example)
</p>
<ul class="org-ul">
<li><b>Cherry</b>: H e l l o \0.</li>
<li><b>Crystal</b>: W o r l d \0.</li>
<li>Cherry[0] here is <b>H</b>, or in ASCII <b>72</b>. And Crystal[0] is <b>W</b> or <b>87</b>.</li>
<li>Mask[0] in this case is : Cherry[0] - Crystal[0]. which is <b>-15</b>. We then repeat the same steps for each letter on the <b>Crystal</b>.</li>
</ul>
<p>
Why the emphasis on <b>Crystal</b> ? Because we might end up with a case of a Crystal larger than a Cherry. we set the offset to the ASCII value of <b>Crystal[i]</b>, okay which to be fair is not the safest option out there, but I’m planning on fixing it sooner or later. In the case of a large Cherry but a small Crystal…it works but now looking at the code, i have no idea why it works the intended way….
</p>
</div>
</div>
<div id="outline-container-org7cb73ea" class="outline-3">
<h3 id="org7cb73ea">Mooning (Decrypting) 🌕:</h3>
<div class="outline-text-3" id="text-org7cb73ea">
<p>
The function <b>moon(char *cherry, char *crystal, int *mask, int length)</b> works the same way as the sloth function, but in reverse and a small change.
</p>
<ul class="org-ul">
<li><b>The for loop goes through all the elements of the Mask and reconstructing the Crystal using the reverse equation of the encryption</b>. But when it arrives at the end of the <b>Cherry</b> (here we enter the case of a Cherry smaller than a Crystal). Then we will just assume that <b>Mask[i]</b> is the ASCII code of <b>Crystal[i]</b>, and we continue this assumption until the end of the loop.</li>
</ul>
<p>
And voila that’s it. Of course there might be some things I will change, but the overall concept is here!
</p>
</div>
</div>
</div>
</div>
<div id="postamble" class="status">
<p class="author">Author: Crystal & Sloth</p>
<p class="date">Created: 2024-03-17 Sun 21:46</p>
</div>
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