问题遇到的现象和发生背景
在网上找了一个 PHP加密解密函数之Base64 函数,https://www.cnblogs.com/yudis/articles/6056986.html
想转换成java,有哪位帮忙转换一下?
谢谢
问题相关代码,请勿粘贴截图
/**
* Base64 加密实现类
*/
class Basecrypt {
/**
* 加密字符串
* @param string $str 字符串
* @param string $key 加密key
* @param integer $expire 有效期(秒)
* @return string
*/
public static function encrypt($data,$key,$expire=0) {
$expire = sprintf('%010d', $expire ? $expire + time():0);
$key = md5($key);
$data = base64_encode($expire.$data);
$x = 0;
$len = strlen($data);
$l = strlen($key);
$char = $str = '';
for ($i = 0; $i < $len; $i++) {
if ($x == $l) $x = 0;
$char .= substr($key, $x, 1);
$x++;
}
for ($i = 0; $i < $len; $i++) {
$str .= chr(ord(substr($data, $i, 1)) + (ord(substr($char, $i, 1)))%256);
}
return str_replace(array('+','/','='),array('-','_',''),base64_encode($str));
}
/**
* 解密字符串
* @param string $str 字符串
* @param string $key 加密key
* @return string
*/
public static function decrypt($data,$key) {
$key = md5($key);
$data = str_replace(array('-','_'),array('+','/'),$data);
$mod4 = strlen($data) % 4;
if ($mod4) {
$data .= substr('====', $mod4);
}
$data = base64_decode($data);
$x = 0;
$len = strlen($data);
$l = strlen($key);
$char = $str = '';
for ($i = 0; $i < $len; $i++) {
if ($x == $l) $x = 0;
$char .= substr($key, $x, 1);
$x++;
}
for ($i = 0; $i < $len; $i++) {
if (ord(substr($data, $i, 1))<ord(substr($char, $i, 1))) {
$str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
}else{
$str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
}
}
$data = base64_decode($str);
$expire = substr($data,0,10);
if($expire > 0 && $expire < time()) {
return '';
}
$data = substr($data,10);
return $data;
}
}
$str="123aabbccddaabbccdd";
echo $str."<br><br>";
$str= Basecrypt::encrypt($str,"bc432");
echo $str."<br><br>";
echo Basecrypt::decrypt($str,"bc432");