spacecrypt/Examples.php at master · darkknight13/spacecrypt · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
<?php

class SpaceCrypt
{

    protected $string;

    public function __construct($string)
    {
        $this->string = $string;
    }

    public function encrypt($public)
    {
        $public = explode(' ', $public);
        if (count($public) == 1) {
            $public[1] = '';
        } else {
            $str = $this->str2bin($this->string);
            $private = $this->bin2hidden($str);
            $msg_start = $public[0] . ' ' . $private;
            unset($public[0]);
            return $msg_start . implode(' ', $public);
        }
    }

    public function decrypt()
    {
        return $this->bin2str($this->hidden2bin($this->string));
    }

    // Convert a string into binary data
    protected function str2bin($text)
    {
        $bin = array();
        for ($i = 0; strlen($text) > $i; $i ++)
            $bin[] = decbin(ord($text[$i]));
        return implode(' ', $bin);
    }

    // Convert binary data to a string
    protected function bin2str($bin)
    {
        $text = array();
        $bin = explode(' ', $bin);
        for ($i = 0; count($bin) > $i; $i ++)
            $text[] = chr(bindec($bin[$i]));
        return implode($text);
    }

    // Convert the ones, zeros, and spaces of the hidden binary data to their respective zero-width characters
    protected function bin2hidden($str)
    {
        $str = str_replace(' ', "\xE2\x81\xA0", $str); // Unicode Character 'WORD JOINER' (U+2060) 0xE2 0x81 0xA0
        $str = str_replace('0', "\xE2\x80\x8B", $str); // Unicode Character 'ZERO WIDTH SPACE' (U+200B) 0xE2 0x80 0x8B
        $str = str_replace('1', "\xE2\x80\x8C", $str); // Unicode Character 'ZERO WIDTH NON-JOINER' (U+200C) 0xE2 0x80 0x8C
        return $str;
    }

    // Convert zero-width characters to hidden binary data
    protected function hidden2bin($str)
    {
        $str = str_replace("\xE2\x81\xA0", ' ', $str); // Unicode Character 'WORD JOINER' (U+2060) 0xE2 0x81 0xA0
        $str = str_replace("\xE2\x80\x8B", '0', $str); // Unicode Character 'ZERO WIDTH SPACE' (U+200B) 0xE2 0x80 0x8B
        $str = str_replace("\xE2\x80\x8C", '1', $str); // Unicode Character 'ZERO WIDTH NON-JOINER' (U+200C) 0xE2 0x80
        return $str;
    }
}

$public = isset($_REQUEST['public']) ? $_REQUEST['public'] : null;
$private = isset($_REQUEST['private']) ? $_REQUEST['private'] : null;
$encoded = isset($_REQUEST['encoded']) ? $_REQUEST['encoded'] : null;
?>
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<meta property="og:title" content="Spacecrypt">
<meta property="og:url" content="https://ornot.in/spacecrypt/">
<meta property="og:description"
	content="Hide text in plain sight using secret zero-width characters. Digital spacecrypt made simple.">
<title>Spacecrypt</title>
<link rel="stylesheet" type="text/css" href="style">
<!-- Place this tag in your head or just before your close body tag. -->
<script async defer src="https://buttons.github.io/buttons.js"></script>
</head>
<body>

	<header>
		<nav>
			<a href="/"><span class="title">Ornot</span></a>
		</nav>
	</header>

	<main>

	<h1>Spacecrypt</h1>

	<p>
		Hide text in plain sight using secret zero-width characters. It's
		digital steganography made simple. Inspired by <a
			href="https://www.zachaysan.com/writing/2017-12-30-zero-width-characters">Zach
			Aysan</a>.
	</p>

	<p>
		Enter a public message, then a private message, and then click the
		button to hide your private message within your public message.
	</p>

	<form action="?" method="post">
		<div class="col">
			<h2>Public Message</h2>
			<textarea name="public"><?php echo $public; ?></textarea>
		</div>
		<div class="col">
			<h2>Private Message</h2>
			<textarea name="private"><?php echo $private; ?></textarea>
		</div>
		<p>
			<input type="submit" value="Encode">
		</p>
	</form>

<?php

if (isset($_REQUEST['public']) && isset($_REQUEST['private'])) {
    $spaceCrypt = new SpaceCrypt($_REQUEST['private']);
    echo '<hr><div class="col"><h2>Spacecrypt Message</h2>';
    echo '<textarea>';
    echo $spaceCrypt->encrypt($_REQUEST['public']);
    echo '</textarea>';
    echo '<br><small style="color: green;">Copy this text your private message will come along for the ride.</small>';
    echo '</div>';
}

?>

<hr>

	<div class="col">
		<form action="?" method="post">
			<h2>Reveal Private Message</h2>
			<textarea name="encoded"><?php echo $encoded; ?></textarea>
			<p>
				<input type="submit" value="Decode">
			</p>
		</form>
	</div>

<?php

if (isset($_REQUEST['encoded'])) {
    $spaceCrypt = new SpaceCrypt($_REQUEST['encoded']);
    $message = $spaceCrypt->decrypt();

    echo '<div class="col"><h2>Private Message</h2>';
    if (strlen($message) < 2) {
        echo '<span style="color: #993300; font-weight: bold;">No hidden message was found. :-(</span></div>';
    } else {
        echo '<span style="color: #009900; font-weight: bold;">' . $message . '</span></div>';
    }
}

?>

<hr>


	<p>
		<!-- Place this tag where you want the button to render. -->
		<a class="github-button"
			href="https://github.com/darkknight13/spacecrypt" data-size="large"
			data-show-count="true"
			aria-label="Star darkknight13/spacecrypt on GitHub">Star</a>
	</p>


	</main>
</body>
</html>