我想将这个PHP代码$a ^ $b
(其中a的长度是16,b是32)转换为javascript代码。这是我的实现。
var xor = "";
for (var i = 0; i < a.length; i++) {
xor += String.fromCharCode(a.charCodeAt(i) ^ b.charCodeAt(i));
}
xor = b.substr(-16) + xor;
但是,结果并不相同。请帮我弄清楚。谢谢。
顺便说一下,这是我正在解决的代码部分:
var secret = "secret";
var password = "password";
var chal = "2ba5565a539c57c1ce2356e218faa321";
var hexchal = php.pack('H32', chal);
var newchal, newpwd, pappassword;
newchal = php.pack('H*', php.md5(hexchal + secret));
newpwd = php.pack("a32", password);
var xor = "";
for (var i = 0; i < newchal.length; i++) {
xor += String.fromCharCode(newchal.charCodeAt(i) ^ newpwd.charCodeAt(i));
}
xor = newpwd.substr(-16) + xor;
对应的 PHP 代码:
<?php
$secret = "secret";
$password = "password";
$chal = "2ba5565a539c57c1ce2356e218faa321";
$hexchal = pack ("H32", $chal);
$newchal = pack ("H*", md5($hexchal . $secret));
$newpwd = pack("a32", $password);
$pappassword = implode ("", unpack("H32", ($newpwd ^ $newchal)));
echo $pappassword;
?>
其中 a 和 b 分别是 newchal 和 newpwd。php.func()s来自 http://phpjs.org/。预期输出为"821f984aa1062e56dbdc8f77454e5eb3"。
我几乎从字面上使用了您的代码:
String.prototype.xor = function(other)
{
var xor = "";
for (var i = 0; i < this.length && i < other.length; ++i) {
xor += String.fromCharCode(this.charCodeAt(i) ^ other.charCodeAt(i));
}
return xor;
}
当到达任一字符串的末尾时,循环应停止。
测试:
String.prototype.toHex = function() {
var hex = '', tmp;
for(var i=0; i<this.length; i++) {
tmp = this.charCodeAt(i).toString(16)
if (tmp.length == 1) {
tmp = '0' + tmp;
}
hex += tmp
}
return hex;
}
var x = "password'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000'u0000";
var y = "'u00f2~'u00eb9'u00d6i''2'u00db'u00dc'u008fwEN^'u00b3";
x.xor(y).toHex();
输出:
821f984aa162e56dbdc8f77454e5eb3
如果 b 的长度超过:
if(i < b.length){
xor += String.fromCharCode(a.charCodeAt(i) ^ b.charCodeAt(i));
}else{
xor += a.charAt(i);
}