A set of PHP reversible encryption and decryption algorithm example codes_PHP tutorial

function encrypt($data, $key)
{
$key = md5($key);
$x = 0;
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++)
{
if ($x == $l)
{
$x = 0;
}
        $char .= $key{$x};
                                                                        $x++;                          str .= chr(ord($data{$i}) + (ord($char{$i})) % 256);
}
return base64_encode($str);
}


The decryption algorithm is as follows:

$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$l = strlen($key);
for ($i = 0; $i < $len; $i++)
{
if ($x == $l)
                                                                                                                 0; $i < $len; $i++)
{
if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
                                                                                                                    
else
{
$str .= chr(ord(substr($data, $i, 1)) - ord(substr($char, $i, 1)));
}
}
return $str;
}


The above encryption and decryption processes all require the use of an encryption key (i.e. parameter $key).



Copy code

The code is as follows:


$data = 'PHP encryption and decryption algorithm'; // Encrypted information
$key = '123'; // Key

As can be seen from the above results, this is a set of reversible encryption and decryption algorithms that can be used to encrypt some data that needs to be restored.




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