PHP des 3des加解密

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开启Mcrypt扩展,获取mcrypt的加密算法与模式列表：

$cipher_list = mcrypt_list_algorithms();//mcrypt支持的加密算法列表  $mode_list = mcrypt_list_modes();   //mcrypt支持的加密模式列表  echo '<xmp>';  print_r($cipher_list);  print_r($mode_list);  echo '</xmp>';

封装了一个DES加解密的类适用于MCRYPT_RIJNDAEL_128，3DES算法，PKCS7填充其它未测

使用时记得更改算法与模式，将其中的MCRYPT_RIJNDAEL_128，MCRYPT_MODE_CBC替换即可

<?phpclass StdDes{    private $key = "";    private $iv = "";    /**     * 构造，传递二个已经进行base64_encode的KEY与IV     *     * @param string $key     * @param string $iv     */    function __construct($key, $iv)    {        if (empty($key) || empty($iv)) {            echo 'key and iv is not valid';            exit();        }        $this->key = $key;        $this->iv = $iv;    }    /**     *加密     * @param <type> $value     * @return <type>     */    public function encrypt($value)    {        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');        $iv = base64_decode($this->iv);        $value = $this->PaddingPKCS7($value);        $key = base64_decode($this->key);        mcrypt_generic_init($td, $key, $iv);        $ret = base64_encode(mcrypt_generic($td, $value));        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $ret;    }    /**     *解密     * @param <type> $value     * @return <type>     */    public function decrypt($value)    {        $td = mcrypt_module_open(MCRYPT_RIJNDAEL_128, '', MCRYPT_MODE_CBC, '');        $iv = base64_decode($this->iv);        $key = base64_decode($this->key);        mcrypt_generic_init($td, $key, $iv);        $ret = trim(mdecrypt_generic($td, base64_decode($value)));        $ret = $this->UnPaddingPKCS7($ret);        mcrypt_generic_deinit($td);        mcrypt_module_close($td);        return $ret;    }    private function PaddingPKCS7($data)    {        $block_size = mcrypt_get_block_size('tripledes', 'cbc');        $padding_char = $block_size - (strlen($data) % $block_size);        $data .= str_repeat(chr($padding_char), $padding_char);        return $data;    }    private function UnPaddingPKCS7($text)    {        $pad = ord($text{strlen($text) - 1});        if ($pad > strlen($text)) {            return false;        }        if (strspn($text, chr($pad), strlen($text) - $pad) != $pad) {            return false;        }        return substr($text, 0, -1 * $pad);    }}/*//使用include('StdDes.class.php');$key = 'abcdefgh';$iv = 'abcdefgh';$msg = 'test string';$des = new StdDes(base64_encode($key), base64_encode($iv));$rs1 = $des->encrypt($msg);echo $rs1 . '<br />';$rs2 = $des->decrypt($rs1);echo $rs2;*/?>

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