Get Using PHP Encryption Quick Guide

Get Using PHP Encryption Quick Guide (Ubuntu 12.04 - Apache 2.3)

1. Download Mcrypt module:

   $ sudo apt-get install php5-mcrypt
   $ sudo service apache2 reload

2. Edit php.ini. Uncomment these two lines:

   [mcrypt]
   mcrypt.algorithms_dir=/usr/local/lib/libmcrypt
   mcrypt.modes_dir=/usr/local/lib/libmcrypt

3. Reload Apache.

   $ sudo service apache2 reload

4. Use the function in your code. Here I use the function in a class:

   <?php
   
   class MyMcrypt
   {
       private $secretKey;
       private $iv;
       private $cypher = MCRYPT_RIJNDAEL_128;
       private $mode = MCRYPT_MODE_CBC;
   
       public function __construct($key)
       {
           $this->secretKey = pack('H*', md5($key));
           $this->iv  = mcrypt_create_iv(mcrypt_get_iv_size($this->cypher, $this->mode), MCRYPT_DEV_URANDOM);
       }
   
       public function getSecretKey()
       {
           return $this->secretKey;
       }
   
       public function encrypt($text)
       {
           return base64_encode(mcrypt_encrypt($this->cypher, $this->secretKey, $text, $this->mode, $this->iv));
       }
   
       public function decrypt($text)
       {
           $string = base64_decode($text);
           return mcrypt_decrypt($this->cypher, $this->secretKey, $string, $this->mode, $this->iv);
       }
   
   }
   
   $text = <<<EOL
   Bacon ipsum dolor sit amet brisket strip steak swine shank tenderloin cow kielbasa. T-bone pork belly prosciutto salami ribeye turducken drumstick ham porchetta. Short loin pancetta pastrami ribeye t-bone leberkas tongue drumstick brisket swine porchetta prosciutto shank jerky shoulder. Bacon beef chuck tongue pork loin t-bone. Frankfurter tenderloin fatback tail jerky prosciutto.
   EOL;
   
   const KEY = 'SecretKey2014IsTheYearOfTheSnake'; // 32 chars long
   
   $mcrypt = new MyMcrypt(KEY);
   $encryptedText = $mcrypt->encrypt($text);
   $unencryptedText = $mcrypt->decrypt($encryptedText);
   
   echo $encryptedText."\n";
   echo $unencryptedText."\n";