PHP token Token improved version

It is precisely because of the use of base64 that there is a problem when sending this token through the GET method.
For example: http://test/test.php?a=1+2
You use $_GET["a"] to get: 1 2, that is, the plus sign is gone. At first I used urlencode to convert it, but there were always one or two results that were unexpected.

Later I thought about the base64 characters are limited to: [A-Za-z0-9+/=] There are so many, the plus sign is a problem, so I changed the plus sign to a symbol that does not cause the problem, the underscore is the best choose. The following is the modified code:

GEncrypt.inc.php

The code is as follows:

class GEncrypt {
protected static function keyED($txt, $encrypt_key) {
$encrypt_key = md5 ( $encrypt_key );
$ctr = 0;
$tmp = "";
for($i = 0; $i < strlen ( $txt ); $i ++) {
if ($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 < strlen ( $txt ); $i ++) {
if ($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 < strlen ( $txt ); $i ++) {
$md5 = substr ( $txt, $i, 1 );
$i ++;
$tmp .= (substr ( $txt, $i, 1 ) ^ $md5);
}
return $tmp;
}
}

?>

GToken.inc.php

The code is as follows:

/**
* Principle: When requesting to allocate a token, find a way to allocate a unique token, base64( time + rand + action)
* If submitted, record this token, indicating that this token has been used before, and you can follow it to avoid duplication submit.
*
*/ 
class GToken { 

/**
* Get all current tokens
*
* @return array
*/ 
public static function getTokens(){ 
$tokens = $_SESSION[GConfig::SSN_KEY_TOKEN ]; 
if (empty($tokens) && !is_array($tokens)) { 
$tokens = array(); 
} 
return $tokens; 
} 

/**
* Generate a new Token
*
* @param string $formName
* @param Encryption key $key
* @return string
*/ 

public static function newToken($formName,$key = GConfig::ENCRYPT_KEY ){ 
$token = GEncrypt::encrypt($formName.session_id(),$key); 
return $token; 
} 

/**
* Deleting a token actually adds an element to an array in the session, indicating that the token has been used before to avoid repeated submission of data.
*
* @param string $token
*/ 
public static function dropToken($token){ 
$tokens = self::getTokens(); 
$tokens[] = $token; 
GSession::set(GConfig::SESSION_KEY_TOKEN ,$tokens); 
} 

/**
* Check whether it is the specified Token
*
* @param string $token The token value to be checked
* @param string $formName
* @param boolean $fromCheck Whether to check the source, if it is true, it will be judged that the token is appended Whether the session_id is the same as the current session_id.
* @param string $key encryption key
* @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); 
} 
} 
?>

以上就是PHP令牌 Token改进版的代码实例，希望可以帮助到大家，更多相关内容请关注PHP中文网（www.php.cn）！