php-java登录thinksns时的加密解密操作

api说在登录的时候账号需要des加密, 密码需要des和md5加密, 可是我用了好几种des加密都是认证失败.
我用的是java, 下面是我从thinksns 里找到的php代码, 求好心人转成java, php真心不太懂

class DES_MOBILE {
var $key = '12345678';

function  setKey($key){    $this->key = $key;    return $this;}function encrypt($string) {    $ivArray=array(0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF);    $iv=null;    foreach ($ivArray as $element)        $iv.=CHR($element);    $size = mcrypt_get_block_size ( MCRYPT_DES, MCRYPT_MODE_CBC );     $string = $this->pkcs5Pad ( $string, $size );      $data =  mcrypt_encrypt(MCRYPT_DES, $this->key, $string, MCRYPT_MODE_CBC, $iv);    $data = base64_encode($data);    return $data;}function decrypt($string) {    $ivArray=array(0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF);    $iv=null;    foreach ($ivArray as $element)        $iv.=CHR($element);    $string = base64_decode($string);    $result =  mcrypt_decrypt(MCRYPT_DES, $this->key, $string, MCRYPT_MODE_CBC, $iv);    $result = $this->pkcs5Unpad( $result );      return $result;} function pkcs5Pad($text, $blocksize)  {      $pad = $blocksize - (strlen ( $text ) % $blocksize);      return $text . str_repeat ( chr ( $pad ), $pad );  }  function pkcs5Unpad($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 );  }  

}