php aes 加密类

__construct ( $bit , $key, $iv ,$mode );

<?php

class AESMcrypt {

    public $iv = null;
    public $key = null;
    public $bit = 128;
    private $cipher;

    public function __construct($bit, $key, $iv, $mode) {
        if(empty($bit) || empty($key) || empty($iv) || empty($mode))
        return NULL;

        $this->bit = $bit;
        $this->key = $key;
        $this->iv = $iv;
        $this->mode = $mode;

        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), "\\x00..\\x1F");
        return $data;
    }

}

$aes = new AESMcrypt($bit = 128, $key = 'abcdef1234567890', $iv = '0987654321fedcba', $mode = 'cbc');
$c = $aes->encrypt('haowei.me');
var_dump($aes->decrypt($c));
//该片段来自于http://outofmemory.cn