SB_Facebook_Data_Encryption.php — Smash Balloon Social Post Feed – Simple Social Feeds for WordPress 4.8.1

custom-facebook-feed / inc / SB_Facebook_Data_Encryption.php

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SB_Facebook_Data_Encryption.php

199 lines

1	<?php
2
3	/**
4	* Class SB_Facebook_Data_Encryption
5	*
6	* @copyright 2021 Google LLC
7	* @license https://www.apache.org/licenses/LICENSE-2.0 Apache License 2.0
8	* @link https://sitekit.withgoogle.com
9	*/
10
11	namespace CustomFacebookFeed;
12
13	// Exit if accessed directly
14	if (! defined('ABSPATH')) {
15	exit;
16	}
17
18
19	/**
20	* Class responsible for encrypting and decrypting data.
21	*
22	* @since 2.9.4/5.12.4
23	* @access private
24	* @ignore
25	*/
26	class SB_Facebook_Data_Encryption
27	{
28	/**
29	* Key to use for encryption.
30	*
31	* @since 2.9.4/5.12.4
32	* @var string
33	*/
34	private $key;
35
36	/**
37	* Salt to use for encryption.
38	*
39	* @since 2.9.4/5.12.4
40	* @var string
41	*/
42	private $salt;
43
44	/**
45	* Constructor.
46	*
47	* @since 2.9.4/5.12.4
48	*/
49	public function __construct($remote = array())
50	{
51	if (! empty($remote)) {
52	$this->key = $remote['key'];
53	$this->salt = $remote['salt'];
54	} else {
55	$this->key = $this->get_default_key();
56	$this->salt = $this->get_default_salt();
57	}
58	}
59
60	/**
61	* Encrypts a value.
62	*
63	* If a user-based key is set, that key is used. Otherwise the default key is used.
64	*
65	* @since 2.9.4/5.12.4
66	*
67	* @param string $value Value to encrypt.
68	* @return string\|bool Encrypted value, or false on failure.
69	*/
70	public function encrypt($value)
71	{
72	if (! cff_doing_openssl()) {
73	return $value;
74	}
75
76	$method = 'aes-256-ctr';
77	$ivlen = openssl_cipher_iv_length($method);
78	$iv = openssl_random_pseudo_bytes($ivlen);
79
80	$raw_value = openssl_encrypt($value . $this->salt, $method, $this->key, 0, $iv);
81	if (! $raw_value) {
82	return false;
83	}
84
85	return base64_encode($iv . $raw_value);
86	}
87
88	/**
89	* Decrypts a value.
90	*
91	* If a user-based key is set, that key is used. Otherwise the default key is used.
92	*
93	* @since 2.9.4/5.12.4
94	*
95	* @param string $raw_value Value to decrypt.
96	* @return string\|bool Decrypted value, or false on failure.
97	*/
98	public function decrypt($raw_value)
99	{
100	if (! cff_doing_openssl()) {
101	return $raw_value;
102	}
103
104	$raw_value = base64_decode($raw_value, true);
105
106	$method = 'aes-256-ctr';
107	$ivlen = openssl_cipher_iv_length($method);
108	$iv = substr($raw_value, 0, $ivlen);
109
110	$raw_value = substr($raw_value, $ivlen);
111
112	$value = openssl_decrypt($raw_value, $method, $this->key, 0, $iv);
113	if (! $value \|\| substr($value, - strlen($this->salt)) !== $this->salt) {
114	return false;
115	}
116
117	return substr($value, 0, - strlen($this->salt));
118	}
119
120
121	public function maybe_encrypt($raw_value)
122	{
123	$maybe_decrypted = $this->decrypt($raw_value);
124
125	if ($maybe_decrypted) {
126	return $this->encrypt($maybe_decrypted);
127	}
128
129	return $this->encrypt($raw_value);
130	}
131
132	/**
133	* Uses a raw value and attempts to decrypt it
134	*
135	* @param $value
136	*
137	* @return bool\|string
138	*/
139	public function maybe_decrypt($value)
140	{
141	if (! is_string($value)) {
142	return $value;
143	}
144	if (strpos($value, '{') === 0) {
145	return $value;
146	}
147
148	$decrypted = $this->decrypt($value);
149
150	if (! $decrypted) {
151	return $value;
152	}
153
154	return $decrypted;
155	}
156
157	/**
158	* Gets the default encryption key to use.
159	*
160	* @since 2.9.4/5.12.4
161	*
162	* @return string Default (not user-based) encryption key.
163	*/
164	private function get_default_key()
165	{
166	if (defined('CFF_ENCRYPTION_KEY') && '' !== CFF_ENCRYPTION_KEY) {
167	return CFF_ENCRYPTION_KEY;
168	}
169
170	if (defined('LOGGED_IN_KEY') && '' !== LOGGED_IN_KEY) {
171	return LOGGED_IN_KEY;
172	}
173
174	// If this is reached, you're either not on a live site or have a serious security issue.
175	return 'das-ist-kein-geheimer-schluessel';
176	}
177
178	/**
179	* Gets the default encryption salt to use.
180	*
181	* @since 2.9.4/5.12.4
182	*
183	* @return string Encryption salt.
184	*/
185	private function get_default_salt()
186	{
187	if (defined('CFF_ENCRYPTION_SALT') && '' !== CFF_ENCRYPTION_SALT) {
188	return CFF_ENCRYPTION_SALT;
189	}
190
191	if (defined('LOGGED_IN_SALT') && '' !== LOGGED_IN_SALT) {
192	return LOGGED_IN_SALT;
193	}
194
195	// If this is reached, you're either not on a live site or have a serious security issue.
196	return 'das-ist-kein-geheimes-salz';
197	}
198	}
199