/
sqAES.php
75 lines (64 loc) · 1.88 KB
/
sqAES.php
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
<?php
class sqAES
{
/**
* decrypt AES 256
*
* @param string $password
* @param data $edata
*
* @return dencrypted data
*/
public static function decrypt($password, $edata)
{
$data = base64_decode($edata);
$salt = substr($data, 8, 8);
$ct = substr($data, 16);
/**
* From https://github.com/mdp/gibberish-aes
*
* Number of rounds depends on the size of the AES in use
* 3 rounds for 256
* 2 rounds for the key, 1 for the IV
* 2 rounds for 128
* 1 round for the key, 1 round for the IV
* 3 rounds for 192 since it's not evenly divided by 128 bits
*/
$rounds = 3;
$data00 = $password.$salt;
$md5_hash = array();
$md5_hash[0] = md5($data00, true);
$result = $md5_hash[0];
for ($i = 1; $i < $rounds; $i++) {
$md5_hash[$i] = md5($md5_hash[$i - 1].$data00, true);
$result .= $md5_hash[$i];
}
$key = substr($result, 0, 32);
$iv = substr($result, 32, 16);
return openssl_decrypt($ct, 'aes-256-cbc', $key, true, $iv);
}
/**
* crypt AES 256
*
* @param string $password
* @param data $data
*
* @return base64 encrypted data
*/
public static function crypt($password, $data)
{
// Set a random salt
$salt = openssl_random_pseudo_bytes(8);
$salted = '';
$dx = '';
// Salt the key(32) and iv(16) = 48
while (strlen($salted) < 48) {
$dx = md5($dx.$password.$salt, true);
$salted .= $dx;
}
$key = substr($salted, 0, 32);
$iv = substr($salted, 32, 16);
$encrypted_data = openssl_encrypt($data, 'aes-256-cbc', $key, true, $iv);
return base64_encode('Salted__'.$salt.$encrypted_data);
}
}