php源码分析之DZX1.5加密解密函数authcode用法

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<?php

$authkey = '';

/**

* @param string $string: 输入的需要加密（或解密）的明文（或密文）

* @param string $operation: 'DECODE'或其它，其中默认表示解密，输入其它表示加密

* @param string $key: 加解密密钥

* @param int $expiry: 有效期

*/

function authcode($string, $operation = 'DECODE', $key = '', $expiry = 0) {

global $authkey;

$ckey_length = 4;

$key = md5($key != '' ? $key : $authkey);

$keya = md5(substr($key, 0, 16));

$keyb = md5(substr($key, 16, 16));

$keyc = $ckey_length ? ($operation == 'DECODE' ? substr($string, 0, $ckey_length): substr(md5(microtime()), -$ckey_length)) : '';

$cryptkey = $keya.md5($keya.$keyc);

$key_length = strlen($cryptkey);

$string = $operation == 'DECODE' ? base64_decode(substr($string, $ckey_length)) : sprintf('%010d', $expiry ? $expiry + time() : 0).substr(md5($string.$keyb), 0, 16).$string;

$string_length = strlen($string);

$result = '';

$box = range(0, 255);

$rndkey = array();

for($i = 0; $i <= 255; $i++) {

$rndkey[$i] = ord($cryptkey[$i % $key_length]);

}

for($j = $i = 0; $i < 256; $i++) {

$j = ($j + $box[$i] + $rndkey[$i]) % 256;

$tmp = $box[$i];

$box[$i] = $box[$j];

$box[$j] = $tmp;

}

for($a = $j = $i = 0; $i < $string_length; $i++) {

$a = ($a + 1) % 256;

$j = ($j + $box[$a]) % 256;

$tmp = $box[$a];

$box[$a] = $box[$j];

$box[$j] = $tmp;

$result .= chr(ord($string[$i]) ^ ($box[($box[$a] + $box[$j]) % 256]));

}

if($operation == 'DECODE') {

if((substr($result, 0, 10) == 0 || substr($result, 0, 10) - time() > 0) && substr($result, 10, 16) == substr(md5(substr($result, 26).$keyb), 0, 16)) {

return substr($result, 26);

} else {

return '';

}

} else {

return $keyc.str_replace('=', '', base64_encode($result));

}

}

$str = '1234';

$key = '1234';

echo "明文:".$str;

echo "<br />";

echo "密钥:".$key;

$encode = authcode($str,'11',$key);

echo "<br />";

echo "加密后的密文:".$encode;

echo "<br />";

$decode = authcode($encode,'DECODE',$key);

echo "解密后的明文:".$decode;

/*End of php*/