Cornichonize

code.php

<?php

class Cornicode
{
    static public function cornichonize(string $text) {

        // Reverse
        $cypher = strrev($text);

        // Rotate
        $cypher = str_rot13($cypher);

        // Hex
        $cypher = bin2hex($cypher);

        // Base64
        $cypher = base64_encode($cypher);

        return $cypher;
    }

    static public function decornichonize(string $cypher) {

        // Base64
        $cypher = base64_decode($cypher);

        // Hex
        $cypher = hex2bin($cypher);

        // Rotate
        $cypher = str_rot13($cypher);

        // Reverse
        $text = strrev($cypher);

        return $text;
    }

    static public function xorify(string $text, string $key)
    {
        $out = '';

        for ($i = 0; $i < strlen($text); ) {
            for ($j = 0; $j < strlen($key) && $i < strlen($text); $j++, $i++) {
                $out .= $text[$i] ^ $key[$j];
            }
        }

        return $out;
    }
}

// encode

$message = 'The first one to decrypt this wins a tree. Send a :deciduous_tree: emoji to #coding_night';
$key = 'broccoli';

$xorified = base64_encode(Cornicode::xorify($message, $key));

$cornichonized = Cornicode::cornichonize("Ahahah ! C'est beaucoup trop facile, mais qu'est ce que tu croyais ?

En fait, le cypher, c'est ça :

{$xorified}
");

echo $cornichonized, PHP_EOL;

// decode

$text = Cornicode::decornichonize($cornichonized);
echo $text, PHP_EOL;

$text = Cornicode::xorify(base64_decode($xorified), $key);
echo $text, PHP_EOL;