一个简洁的PHP可逆加密函数(分享)

本篇文章是对一个简洁的PHP可逆加密函数进行了详细的分析介绍，需要的朋友参考下

复制代码代码如下:

// 加密数据并写到cookie里
$cookie_data = $this -> encrypt("nowamagic", $data);

$cookie = array(
'name'   => '$data',
'value'  => $cookie_data,
'expire' => $user_expire,
'domain' => '',
'path'   => '/',
'prefix' => ''
);
$this->input->set_cookie($cookie);

// 加密
public function encrypt($key, $plain_text) {
$plain_text = trim($plain_text);
$iv = substr(md5($key), 0,mcrypt_get_iv_size (MCRYPT_CAST_256,MCRYPT_MODE_CFB));
$c_t = mcrypt_cfb (MCRYPT_CAST_256, $key, $plain_text, MCRYPT_ENCRYPT, $iv);
return trim(chop(base64_encode($c_t)));
}

使用的时候再解密：
if( isset($_COOKIE['data']) )
{
//用cookie给session赋值
$_SESSION['data'] = decrypt("nowamagic", $_COOKIE['data']);
}

function decrypt($key, $c_t) {
$c_t = trim(chop(base64_decode($c_t)));
$iv = substr(md5($key), 0,mcrypt_get_iv_size (MCRYPT_CAST_256,MCRYPT_MODE_CFB));
$p_t = mcrypt_cfb (MCRYPT_CAST_256, $key, $c_t, MCRYPT_DECRYPT, $iv);
return trim(chop($p_t));
}