相当繁重,但非常好的加密,通过使用ord
&chr
一点。虽然这可行,但请考虑其他选项:仅能够使用字符串而不是数字已经使它变得更简单(base64_encode
等等):
<?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;
结果:
057044206104214236155088
57044206104214236155088
1234