class des{
private $key;
private $iv;
public function __construct($key, $iv='23456789')
{
$this->key = $key;
$this->iv = $iv;
}
function fixUrlSafeEncode($str, $isEncrypt = true)
{
$str1 = ['=','/','+'];
$str2 = ['.','_','-'];
if (!$isEncrypt)
{
list($str1,$str2) = [$str2,$str1];
}
return str_replace($str1, $str2, $str);
}
function encrypt($input)
{
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
$input = $this->PaddingPKCS7($input);
@mcrypt_generic_init($td, $this->key, $this->iv);
$data = mcrypt_generic($td, $input);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$data = $this->fixUrlSafeEncode(base64_encode($data));
return $data;
}
function decrypt($encrypted)
{
$encrypted = $this->fixUrlSafeEncode($encrypted,false);
$td = mcrypt_module_open(MCRYPT_3DES, '', MCRYPT_MODE_ECB, '');
@mcrypt_generic_init($td, $this ->key, $this->iv);
$encrypted = base64_decode($encrypted);
$ret = trim(mdecrypt_generic($td, $encrypted));
$ret = $this->UnPaddingPKCS7($ret);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
return $ret;
}
function pkcs5_pad($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('tripledes', MCRYPT_MODE_ECB);
$padding_char = $block_size - (strlen($data) % $block_size);
$data .= str_repeat(chr($padding_char), $padding_char);
return $data;
}
function UnPaddingPKCS7($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);
}
}