PHP token Token improved version_PHP tutorial-PHP Tutorial-php.cn

PHP token Token improved version_PHP tutorial

WBOY

Release： 2016-07-21 15:51:13

Original

989 people have browsed it

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.

Then I thought about it, the characters of base64 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, underline is the best choice. The following is the modified code:

GEncrypt.inc.php

Copy the code 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, 99999999 999999999 )). 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

Copy code 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 to indicate that this token has been used and can be used accordingly It is used to avoid duplicate submissions. 
 * 
*/  
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 true, it will be judged whether the session_id attached to the token 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);  
 }  
}  
?> 