1 <?php
 2 
 3 namespace PayPal\Security;
 4 
 5 /**
 6  * Class Cipher
 7  *
 8  * Helper class to encrypt/decrypt data with secret key
 9  *
10  * @package PayPal\Security
11  */
12 class Cipher
13 {
14     private $secretKey;
15 
16     /**
17      * Fixed IV Size
18      */
19     const IV_SIZE = 16;
20 
21     public function __construct($secretKey)
22     {
23         $this->secretKey = $secretKey;
24     }
25 
26     /**
27      * Encrypts the input text using the cipher key
28      *
29      * @param $input
30      * @return string
31      */
32     public function encrypt($input)
33     {
34         // Create a random IV. Not using mcrypt to generate one, as to not have a dependency on it.
35         $iv = substr(uniqid("", true), 0, Cipher::IV_SIZE);
36         // Encrypt the data
37         $encrypted = openssl_encrypt($input, "AES-256-CBC", $this->secretKey, 0, $iv);
38         // Encode the data with IV as prefix
39         return base64_encode($iv . $encrypted);
40     }
41 
42     /**
43      * Decrypts the input text from the cipher key
44      *
45      * @param $input
46      * @return string
47      */
48     public function decrypt($input)
49     {
50         // Decode the IV + data
51         $input = base64_decode($input);
52         // Remove the IV
53         $iv = substr($input, 0, Cipher::IV_SIZE);
54         // Return Decrypted Data
55         return openssl_decrypt(substr($input, Cipher::IV_SIZE), "AES-256-CBC", $this->secretKey, 0, $iv);
56     }
57 }
58 

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