用php改写百度mp3地址的加密方式

百度mp3地址是加密过的,具体加密方式大家自己看吧.解码函数如下:

//copyright http://www.k686.com

//author tuzwu58@gmail.com

function decode(url){

var len = url.length;

var decurl = "";

var asc_arr1 = [], asc_arr2 = [];

var key = sertim % 26;

key = key ? key : 1;

function init(head, bottom, middle){

for (var i = head; i <= bottom; i++) {

asc_arr1[i] = i + middle;

asc_arr2[i + middle] = i;

}

}

init(0, 9, 48);

init(10, 35, 55);//http://www.k686.com

init(36, 61, 61);

for (var i = 0; i < len; i++) {

var word = url.charAt(i);

if (/[A-Za-z0-9]/.test(word)) {

var pos = asc_arr2[url.charCodeAt(i)] - key;

if (pos < 0)

pos += 62;

word = String.fromCharCode(asc_arr1[pos]);

}

decurl += word;

}

return decurl;

}

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传入的字符串格式形如:

str = "o00w://333.osq.z0h0z.nv2.ju/q5/4p14phuzopN1hun/44zn977D7A9F8G-7A.twA";

var sertim = 1289225685;

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两个变量需要带入到上面的函数,这样才能解析为一个标准的url地址.

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下面是php改写后的:

//copyright http://www.k686.com

//author tuzwu58@gmail.com

function decode($url,$sertim){

$len = strlen($url);

$decurl = "";

$asc_arr1 = array();

$asc_arr2 = array();

$key = $sertim % 26;

$key = $key ? $key : 1;

//第1次 http://www.k686.com

for ($i = 0; $i <= 9; $i++) {

$asc_arr1[$i] = $i + 48;

$asc_arr2[$i + 48] = $i;

}

//第2次

for ($i = 10; $i <= 35; $i++) {

$asc_arr1[$i] = $i + 55;

$asc_arr2[$i + 55] = $i;

}

//第3次

for ($i = 36; $i <= 61; $i++) {

$asc_arr1[$i] = $i + 61;

$asc_arr2[$i + 61] = $i;

}

//end http://www.k686.com

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

$word = substr($url,$i,1);

if (preg_match("/[A-Za-z0-9]/",$word)) {

$pos = $asc_arr2[ord(substr($url,$i,1))] - $key;

if ($pos < 0){

$pos += 62;

}

$word = chr($asc_arr1[$pos]);

}

$decurl .= $word;

}

return $decurl;

}

$str = 'o00w://333.osq.z0h0z.nv2.ju/q5/4p14phuzopN1hun/44zn977D7A9F8G-7A.twA';

$sertim = 1289225685;

echo decode($str,$sertim);

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算是用php改写了js函数,功能是一模一样的.传入的两个参数都可以在百度mp3页面找得到的.

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