Php将一个数字改成另一个可以改回原来的号码 [英] Php change a number into another number that can be changed back to the original

问题描述

使用PHP，我试图将一个数字编码成另一个数字，我可以解码回原来的数字。编码的字符串只需要数字，不能包含任何其他内容。

例如：10成为573563547892或类似的东西。

如何在PHP中执行这样的操作？我尝试了相当多的加密解密功能，但没有输出数字。

我在一个URL中寻找一些不容易猜到的东西。 >

所以： http://www.me .com / index.PHP？page = 20 成为 http：// www。 me.com/index.PHP?page=5705254782562466

解决方案

相当沉重但非常好的加密，通过使用 ord & chr 有点。虽然这有效，但考虑其他选项：只需使用字符串，而不是数字已经使它更简单（ base64_encode 等）：

 <？php 
 class Crypter {
 private $ key = ; 
 private $ iv =''; 
函数__construct（$ key，$ iv）{
 $ this-> key = $ key; 
 $ this-> iv = $ iv; 
} 
 protected function getCipher（）{
 $ cipher = mcrypt_module_open（MCRYPT_BLOWFISH，''，'cbc'，''）; 
 mcrypt_generic_init（$ cipher，$ this-> key，$ this-> iv）; 
 return $ cipher; 
} 
函数encrypt（$ string）{
 $ binary = mcrypt_generic（$ this-> getCipher（），$ string）; 
 $ string =''; （$ i = 0; $ i< strlen（$ binary）; $ i ++）{
 $ string。= str_pad（ord（$ binary [$ i]），3，'0' ，STR_PAD_LEFT）; 
} 
 return $ string; 
} 
函数解密（$ encrypted）{
 //检查缺少的前导0的
 $ encrypted = str_pad（$ encrypted，ceil（strlen（$ encrypted）/ 3）* 3，'0'，STR_PAD_LEFT）; 
 $ binary =''; 
 $ values = str_split（$ encrypted，3）; 
 foreach（$ values as $ chr）{
 $ chr = ltrim（$ chr，'0'）; 
 $ binary。= chr（$ chr）; 
} 
 return mdecrypt_generic（$ this-> getCipher（），$ binary）; 
} 
} 
 
 $ crypt = new Crypter（'secret key'，'12348765'）; 
 $ encrypted = $ crypt-> encrypt（1234）; 
 echo $ encrypted.PHP_EOL; 
 //假缺少前导0 
 $ encrypted = ltrim（$ encrypted，'0'）; 
 echo $ encrypted.PHP_EOL; 
 $ decryptpted = $ crypt-> decrypt（$ encrypted）; 
 echo $ decryptpted.PHP_EOL; 
  

结果：

 code> 057044206104214236155088 
 57044206104214236155088 
 1234 
  

Using PHP, I'm trying to encode a number into another number that I can decode back to the original number. The encoded string needs to be only numbers and should not contain anything else.

Eg: 10 becomes 573563547892 or something like that.

How can I do something like this in PHP? I tried quite a few encrypt decrypt functions, but none output only numbers.

I looking for something to use in a URL that isn't easy to guess.

So: http://www.me.com/index.PHP?page=20 becomes http://www.me.com/index.PHP?page=5705254782562466

解决方案

Quite heavy, but very good encryption, by using ord & chr a bit. While this works, consider other options: just being able to use strings rather then numbers already makes it a lot simpler (base64_encode etc.):

<?php
class Crypter {
  private $key = '';
  private $iv = '';
  function __construct($key,$iv){
    $this->key = $key;
    $this->iv  = $iv;
  }
  protected function getCipher(){
     $cipher = mcrypt_module_open(MCRYPT_BLOWFISH,'','cbc','');
     mcrypt_generic_init($cipher, $this->key, $this->iv);
     return $cipher;
  }
  function encrypt($string){
     $binary = mcrypt_generic($this->getCipher(),$string);
     $string = '';
     for($i = 0; $i < strlen($binary); $i++){
        $string .=  str_pad(ord($binary[$i]),3,'0',STR_PAD_LEFT);
     }
     return $string;
  }
  function decrypt($encrypted){
     //check for missing leading 0's
     $encrypted = str_pad($encrypted, ceil(strlen($encrypted) / 3) * 3,'0', STR_PAD_LEFT);
     $binary = '';
     $values = str_split($encrypted,3);
     foreach($values as $chr){
        $chr = ltrim($chr,'0');
        $binary .= chr($chr);
     }
     return mdecrypt_generic($this->getCipher(),$binary);
  }
}

$crypt = new Crypter('secret key','12348765');
$encrypted = $crypt->encrypt(1234);
echo $encrypted.PHP_EOL;
//fake missing leading 0
$encrypted = ltrim($encrypted,'0');
echo $encrypted.PHP_EOL;
$decrypted = $crypt->decrypt($encrypted);
echo $decrypted.PHP_EOL;

Result:

057044206104214236155088
57044206104214236155088
1234

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