PHP des 3des加解密

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

<?php
class 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;
*/
?>