PHP encryption/decryption function dencrypt (dynamic ciphertext, with compression function, supports Chinese)_PHP tutorial

Copy code The code is as follows:

// +------------------ -------------------------------------------------- --+
// | Willko Framework |
// +-------------------------------- ---------------------------------------------+
// | Copyright (c) 2008 -2009 Willko Cheng |
// +--------------------------------------------- ----------------------------------+
// | Authors: Willko Cheng |
// +--------------------------------------------- -----------------------------+
// $string plain text or cipher text
// $isEncrypt whether to encrypt or not
// $key key
// Use SHA1 to generate the key book, and use ZLIB compression if it exceeds 300 characters
function dencrypt($string, $isEncrypt = true, $key = KEY_SPACE) {
if (!isset($string{0}) || !isset($key{0})) {
return false;
}

$dynKey = $isEncrypt ? hash('sha1' , microtime(true)) : substr($string, 0, 40);
$fixedKey = hash('sha1', $key);

$dynKeyPart1 = substr($dynKey, 0, 20 );
$dynKeyPart2 = substr($dynKey, 20);
$fixedKeyPart1 = substr($fixedKey, 0, 20);
$fixedKeyPart2 = substr($fixedKey, 20);
$ key = hash('sha1', $dynKeyPart1 . $fixedKeyPart1 . $dynKeyPart2 . $fixedKeyPart2);

$string = $isEncrypt ? $fixedKeyPart1 . $string . $dynKeyPart2 : (isset($string{339} ) ? gzuncompress(base64_decode(substr($string, 40))) : base64_decode(substr($string, 40)));

$n = 0;
$result = '';
$len = strlen($string);

for ($n = 0; $n < $len; $n++) {
$result .= chr(ord($string{$n }) ^ ord($key{$n % 40}));
}
return $isEncrypt ? $dynKey . str_replace('=', '', base64_encode($n > 299 ? gzcompress($ result) : $result)) : substr($result, 20, -20);
}

http://www.bkjia.com/PHPjc/319806.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/319806.htmlTechArticleCopy the code as follows: // +---------------- -------------------------------------------------- ----+ // | Willko Framework | // +------------------------------------------------ -------------...