php接口加解密（3des）

<?php
/*
*2018-12-20
*使用3DES加密
*必须开启mcrypt扩展
*算法公开，请对key严格保密

*/
header("Content-Type:text/html;charset=utf-8");
class DES3 {
var $key = "2rnet2sq";

var $iv = "ubspnhcw";

function encrypt($input){
    $size = mcrypt_get_block_size(MCRYPT_3DES,MCRYPT_MODE_CBC);
    $input = $this->pkcs5_pad($input, $size);
    $key = str_pad($this->key,24,'0');
    $td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_CBC, '');
    if( $this->iv == '' )
    {
        $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
    }
    else
    {
        $iv = $this->iv;
    }
    @mcrypt_generic_init($td, $key, $iv);
    $data = mcrypt_generic($td, $input);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    $data = base64_encode($data);
    return $data;
}
function decrypt($encrypted){
    $encrypted = base64_decode($encrypted);
    $key = str_pad($this->key,24,'0');
    $td = mcrypt_module_open(MCRYPT_3DES,'',MCRYPT_MODE_CBC,'');
    if( $this->iv == '' )
    {
        $iv = @mcrypt_create_iv (mcrypt_enc_get_iv_size($td), MCRYPT_RAND);
    }
    else
    {
        $iv = $this->iv;
    }
    $ks = mcrypt_enc_get_key_size($td);
    @mcrypt_generic_init($td, $key, $iv);
    $decrypted = mdecrypt_generic($td, $encrypted);
    mcrypt_generic_deinit($td);
    mcrypt_module_close($td);
    $y=$this->pkcs5_unpad($decrypted);
    return $y;
}
function pkcs5_pad ($text, $blocksize) {
    $pad = $blocksize - (strlen($text) % $blocksize);
    return $text . str_repeat(chr($pad), $pad);
}
function pkcs5_unpad($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 * $pad);
}
function PaddingPKCS7($data) {
    $block_size = mcrypt_get_block_size(MCRYPT_3DES, MCRYPT_MODE_CBC);
    $padding_char = $block_size - (strlen($data) % $block_size);
    $data .= str_repeat(chr($padding_char),$padding_char);
    return $data;
}

function from_json(yz=preg_match('/[^,:{}\[\]0-9.-+Eaeflnr-u \n\r\t]/',yz==1){
s,ture);
return $arr;
}
}
}

// ret = des->decrypt($ret) . "\n";