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| The code is as follows |
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| 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};
$x + +;
}
for ($i = 0; $i < $len; $i + +)
{
$str. = Chr (Ord ($data {$i}) + (Ord ($char {$i}))% 256);
}
Return Base64_encode ($STR);
} 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;
}
$char. = substr ($key, $x, 1);
$x + +;
}
for ($i = 0; $i < $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));
}
Else
{
$str. = Chr (Ord (substr ($data, $i, 1))-Ord (substr ($char, $i, 1));
}
}
return $str;
} |
The above two functions, one is the encryption function, one is the decryption function. Encrypt ($data, $key) is the cryptographic function, where $data is the content to be encrypted, $key is your key. Decrypt ($data, $key) is the decryption function, where $data is the string to decrypt, $key is the key
