PHP Cryptographic decryption Function _php Tutorial

/**
* Function: Encrypt string processing
* Parameter one: Content that needs to be encrypted
* Parameter two: key
*/
function Passport_encrypt ($STR, $key) {//encryption function
Srand (Double) microtime () * 1000000);
$encrypt _key=md5 (rand (0, 32000));
$ctr = 0;
$tmp = ";
for ($i =0; $i
<>

$ctr = $ctr ==strlen ($encrypt _key)? 0: $ctr;
$tmp. = $encrypt _key[$ctr]. ($str [$i] ^ $encrypt _key[$ctr + +]);
}
Return Base64_encode (Passport_key ($tmp, $key));
}

/**
* Function: Decryption of strings
* Parameter one: ciphertext to be decrypted
* Parameter two: key
*/
function Passport_decrypt ($STR, $key) {//decryption functions
$str =passport_key (Base64_decode ($STR), $key);
$tmp = ";
for ($i =0; $i<>
$MD 5= $str [$i];
$tmp. = $str [+ + $i] ^ $MD 5;
}
return $tmp;
}

/**
* Auxiliary functions
*/
function Passport_key ($str, $encrypt _key) {
$encrypt _key=md5 ($encrypt _key);
$ctr = 0;
$tmp = ";
for ($i =0; $i<>
$ctr = $ctr ==strlen ($encrypt _key)? 0: $ctr;
$tmp. = $str [$i] ^ $encrypt _key[$ctr + +];
}
return $tmp;
}

$str = ' Author: www.phpernote.com ';
$key = ' 658JR ';
$encrypt =passport_encrypt ($str, $key);
$decrypt =passport_decrypt ($encrypt, $key);

Echo ' original: ', $str. '
";
Echo ' ciphertext: ', $encrypt. "
";
echo ' translation: ', $decrypt. '
";

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