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diff --git a/blog/c/cherry.html b/blog/c/cherry.html new file mode 100644 index 0000000..9b5da84 --- /dev/null +++ b/blog/c/cherry.html @@ -0,0 +1,119 @@ +<?xml version="1.0" encoding="utf-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" +"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en"> +<head> +<!-- 2024-03-16 Sat 21:42 --> +<meta http-equiv="Content-Type" content="text/html;charset=utf-8" /> +<meta name="viewport" content="width=device-width, initial-scale=1" /> +<title>Reviving Caesar with a Cherry-flavored Crystal</title> +<meta name="author" content="Crystal & Sloth" /> +<meta name="generator" content="Org Mode" /> +<link rel="stylesheet" type="text/css" href="../../src/css/colors.css"/> +<link rel="stylesheet" type="text/css" href="../../src/css/style.css"/> +<link rel="icon" type="image/x-icon" href="../../../favicon.png"> +</head> +<body> +<div id="org-div-home-and-up"> + <a accesskey="h" href=""> UP </a> + | + <a accesskey="H" href="https://crystal.tilde.institute/"> HOME </a> +</div><div id="content" class="content"> +<h1 class="title">Reviving Caesar with a Cherry-flavored Crystal</h1> +<div id="outline-container-org394c654" class="outline-2"> +<h2 id="org394c654">What ?…</h2> +<div class="outline-text-2" id="text-org394c654"> +<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-org5a46ff7" class="outline-2"> +<h2 id="org5a46ff7">Okay so, what is this all about ?</h2> +<div class="outline-text-2" id="text-org5a46ff7"> +<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-org9e305ea" class="outline-2"> +<h2 id="org9e305ea">The Code :</h2> +<div class="outline-text-2" id="text-org9e305ea"> +<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;">encrypt</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;">decrypt</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>; + encrypt<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>; + decrypt<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> +<div id="postamble" class="status"> +<p class="author">Author: Crystal & Sloth</p> +<p class="date">Created: 2024-03-16 Sat 21:42</p> +</div> +</body> +</html> diff --git a/src/org/blog/c/cherry.org b/src/org/blog/c/cherry.org new file mode 100644 index 0000000..324aa4c --- /dev/null +++ b/src/org/blog/c/cherry.org @@ -0,0 +1,85 @@ +#+title: Reviving Caesar with a Cherry-flavored Crystal +#+AUTHOR: Crystal & Sloth +#+OPTIONS: ^:{} +#+OPTIONS: num:nil +#+EXPORT_FILE_NAME: ../../../../blog/c/cherry.html +#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../src/css/colors.css"/> +#+HTML_HEAD: <link rel="stylesheet" type="text/css" href="../../src/css/style.css"/> +#+OPTIONS: html-style:nil +#+OPTIONS: toc:nil +#+HTML_HEAD: <link rel="icon" type="image/x-icon" href="../../../favicon.png"> +#+HTML_LINK_HOME: https://crystal.tilde.institute/ + +* What ?... +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 *Cherry-Crystal Encryption*. + + +* Okay so, what is this all about ? +This encryption Algorithm that we will call *CCE* 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 ? + + +- It's actually pretty simple. We start with a *Cherry* or a *Visible phrase*, or a *Decoy*, that we will share to people who we don't want to know the secret phrase.. +- Then we ask the user to enter their *Crystal*, *invisible phrase* or *secret*. +- The program then outputs an array of Integers called the *Mask*, or the *Shift*. That is, the shift required to go from cherry_{i} to crystal_{i}. +- Finally, we use both the *Cherry* and *Mask* to get the *Crystal*, a single missing number or letter from both of them can and will output rubbish content. + + +* The Code : + #+BEGIN_SRC c +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +void encrypt(char cherry[], char crystal[], int mask[]) { + int i; + for (i = 0; i < strlen(cherry) - 1; i++) { + mask[i] = cherry[i] - crystal[i]; + } + for (i = strlen(cherry) - 1; i < strlen(crystal) - 1; i++) { + mask[i] = crystal[i]; + } +} +void decrypt(char cherry[], char crystal[], int mask[], int length) { + int i, end = 1; + for (i = 0; i < length; i++) { + if (i == strlen(cherry) - 1 || end == 0) { + crystal[i] = mask[i]; + end = 0; + } else { + crystal[i] = cherry[i] - mask[i]; + } + } +} +int main(int argc, char *argv[]) { + const int size = 1028; + char cherry[size], cherry2[size], crystal[size], crystal2[size]; + int mask[size], mask2[size], i; + int length = 0; + puts("Enter the Cherry: "); + fgets(cherry, size, stdin); + puts("Enter the Crystal: "); + fgets(crystal, size, stdin); + encrypt(cherry, crystal, mask); + for (i = 0; i < strlen(crystal) - 1; i++) { + printf("%d ", mask[i]); + length++; + } + printf("\nYour mask is : %d characters long", length); + puts("\n===Decryption: ===\n"); + puts("Enter the Cherry: "); + fgets(cherry2, size, stdin); + puts("Enter the size of the Mask: "); + scanf("%d", &length); + puts("Enter the mask: "); + for (i = 0; i < length; i++) { + scanf("%d", &mask2[i]); + } + puts("The Crystal is: "); + decrypt(cherry2, crystal2, mask2, length); + puts(crystal2); + return 0; +} + + #+END_SRC + + The program has been tested both on Alpine OS with Musl libc (thanks [[https://kaa.neocities.org/][Kin]]) 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!! |