PHP令牌 Token改进版
正是由于使用了 base64 ,所以在把这个令牌通过 GET方法发送的时候,出现了问题。
比如:http://test/test.php?a=1+2
你用 $_GET["a"] 取得是:1 2 ,即那个加号没有了。一开始我用 urlencode 对其进行转换,但是总有那么一两的结果是意料外的。
后来想想 base64 的字符就限定于: [A-Za-z0-9\+\/=] 这么多,加号出问题,我就把加号换成不出问题的符号,下划线是最好的选择。下面是修改后的代码:
GEncrypt.inc.php
复制代码 代码如下:
class GEncrypt {
protected static function keyED($txt, $encrypt_key) {
$encrypt_key = md5 ( $encrypt_key );
$ctr = 0;
$tmp = "";
for($i = 0; $i if ($ctr == strlen ( $encrypt_key ))
$ctr = 0;
$tmp .= substr ( $txt, $i, 1 ) ^ substr ( $encrypt_key, $ctr, 1 );
$ctr ++;
}
return $tmp;
}
public static function encrypt($txt, $key) {
$encrypt_key = md5 ( (( float ) date ( "YmdHis" ) + rand ( 10000000000000000, 99999999999999999 )) . rand ( 100000, 999999 ) );
$ctr = 0;
$tmp = "";
for($i = 0; $i if ($ctr == strlen ( $encrypt_key ))
$ctr = 0;
$tmp .= substr ( $encrypt_key, $ctr, 1 ) . (substr ( $txt, $i, 1 ) ^ substr ( $encrypt_key, $ctr, 1 ));
$ctr ++;
}
return ( preg_replace("/\\+/s","_", base64_encode ( self::keyED ( $tmp, $key ) ) ));
}
//base64 [A-Za-z0-9\+\/=]
public static function decrypt($txt, $key) {
if($txt == ""){ return false;}
//echo preg_replace("/_/s","+",$txt);
$txt = self::keyED (base64_decode ( preg_replace("/_/s","+", $txt) ), $key );
$tmp = "";
for($i = 0; $i $md5 = substr ( $txt, $i, 1 );
$i ++;
$tmp .= (substr ( $txt, $i, 1 ) ^ $md5);
}
return $tmp;
}
}
?>
GToken.inc.php
复制代码 代码如下:
/**
* 原理:请求分配token的时候,想办法分配一个唯一的token, base64( time + rand + action)
* 如果提交,将这个token记录,说明这个token以经使用,可以跟据它来避免重复提交。
*
*/
class GToken {
/**
* 得到当前所有的token
*
* @return array
*/
public static function getTokens(){
$tokens = $_SESSION[GConfig::SSN_KEY_TOKEN ];
if (empty($tokens) && !is_array($tokens)) {
$tokens = array();
}
return $tokens;
}
/**
* 产生一个新的Token
*
* @param string $formName
* @param 加密密钥 $key
* @return string
*/
public static function newToken($formName,$key = GConfig::ENCRYPT_KEY ){
$token = GEncrypt::encrypt($formName.session_id(),$key);
return $token;
}
/**
* 删除token,实际是向session 的一个数组里加入一个元素,说明这个token以经使用过,以避免数据重复提交。
*
* @param string $token
*/
public static function dropToken($token){
$tokens = self::getTokens();
$tokens[] = $token;
GSession::set(GConfig::SESSION_KEY_TOKEN ,$tokens);
}
/**
* 检查是否为指定的Token
*
* @param string $token 要检查的token值
* @param string $formName
* @param boolean $fromCheck 是否检查来路,如果为true,会判断token中附加的session_id是否和当前session_id一至.
* @param string $key 加密密钥
* @return boolean
*/
public static function isToken($token,$formName,$fromCheck = false,$key = GConfig::ENCRYPT_KEY){
if(empty($token)) return false;
$tokens = self::getTokens();
if (in_array($token,$tokens)) //如果存在,说明是以使用过的token
return false;
$source = GEncrypt::decrypt($token,$key);
if($fromCheck)
return $source == $formName.session_id();
else{
return strpos($source,$formName) === 0;
}
}
public static function getTokenKey($token,$key = GConfig::ENCRYPT_KEY){
if($token == null || trim($token) == "") return false;
$source = GEncrypt::decrypt($token,$key);
return $source != "" ? str_replace(session_id(),"",$source) : false;
}
public function newTokenForSmarty($params){
$form = null;
extract($params);
return self::newToken($form);
}
}
?>

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