codefever/application/libraries/Aes.php

<?php

class AESMcrypt
{
    public $iv = null;
    public $key = null;
    public $bit = 128;
    private $cipher;

    public function __construct($bit = 128, $key = '', $iv = '', $mode = 'cbc')
    {
        $this->bit = $bit ? $bit : 128;
        $this->key = $key ? $key : 'codefever-key';
        $this->iv = $iv ? $iv : 'codefever-iv';
        $this->mode = $mode ? $mode : 'cbc';

        switch($this->bit) {
            case 192:$this->cipher = MCRYPT_RIJNDAEL_192; break;
            case 256:$this->cipher = MCRYPT_RIJNDAEL_256; break;
            default: $this->cipher = MCRYPT_RIJNDAEL_128;
        }

        switch($this->mode) {
            case 'ecb':$this->mode = MCRYPT_MODE_ECB; break;
            case 'cfb':$this->mode = MCRYPT_MODE_CFB; break;
            case 'ofb':$this->mode = MCRYPT_MODE_OFB; break;
            case 'nofb':$this->mode = MCRYPT_MODE_NOFB; break;
            default: $this->mode = MCRYPT_MODE_CBC;
        }
    }

    public function encrypt($data)
    {
        $data = base64_encode(mcrypt_encrypt( $this->cipher, $this->key, $data, $this->mode, $this->iv));
        return $data;
    }

    public function decrypt($data)
    {
        $data = mcrypt_decrypt( $this->cipher, $this->key, base64_decode($data), $this->mode, $this->iv);
        $data = rtrim(rtrim($data), ".");
        return $data;
    }

}