PHP Encryption Algorithm Implementation of Reversible Encryption Algorithm and Decryption Sharing_PHP Tutorial

The encryption algorithm is as follows:

Copy code The code is as follows:

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:

Copy code

The code is as follows:function decrypt($data, $key){

$key = md5($key);

$x = 0;
$data = base64_decode($data);
$len = strlen($data);
$ l = strlen($key);
for ($i = 0; $i < $len; $i++)
{
if ($x == $l)
{
          $x = 0; < $len; $i++)
{
if (ord(substr($data, $i, 1)) < ord(substr($char, $i, 1)))
{
               $str .= chr((ord(substr($data, $i, 1)) + 256) - ord(substr($char, $i, 1)));
                                           
                                                                                                                        
return $str;
}



The above encryption and decryption processes 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

$key = '123'; // Key$encrypt = encrypt($data, $key);

$decrypt = decrypt($encrypt, $key);

echo $encrypt, "n ", $decrypt;

The above will output a result similar to the following:

Copy the code

The code is as follows:


gniCSOzZG+HnS9zcFea7SefNGhXF
PHP encryption Decryption algorithm

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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The encryption algorithm is as follows: Copy the code The code is as follows: function encrypt($data, $key) { $key=md5( $key); $x=0; $len=strlen($data); $l=strlen($key); for ($i = 0; $i $len; $i++) { if ($x ==. ..