我正在使用Google Chrome的“安全配置文件”扩展程序。虽然这个应用程序允许我通过密码保护我的浏览器，但密码字段文本在输入过程中是可见的。我需要隐藏或屏蔽输入。我怎样才能做到这一点？
以下是在安装目录中找到的扩展源代码的详细信息。
插件文件放置在：C:\Users\USERNAME\AppData\Local\Google\Chrome\User Data\Default\Extensions\eddeeogaiodnhfkingpegpmhpdiifbgh\1.2_0\includes
目录结构：\background.html \options.html \images*.png（3张图片）\js\encryption.js
这是 background.html 的 HTML
<html>
<script src="js\encryption.js"></script>
<script>
// Only called when the first window of this profile is opened
try {
var encPassword = localStorage["password"];
if (encPassword != null && encPassword != "") {
var password = prompt(chrome.i18n.getMessage("bg_EnterPass"));
if (password == null || encPassword != MD5(password)) {
chrome.windows.getCurrent(function (window){chrome.windows.remove(window.id)});
}
} else {
alert(chrome.i18n.getMessage("bg_SetOptions"));
chrome.tabs.create({url: "includes/options.html"});
}
} catch (e) {
alert("Secure Profile Error: " + err.description);
}
</script>
</html>
这是 options.html 的 HTML 源代码
<html>
<body onload="body_onload();">
<script src="js\encryption.js"></script>
<script type="text/javascript">
var _strSaved;
var _strPwdMatch;
// Saves options to localStorage.
function saveOptions() {
var password = document.getElementById("password").value;
if (document.getElementById("passwordConfirm").value == password) {
if (password == "")
localStorage["password"] = "";
else
localStorage["password"] = MD5(password);
// Update status to let user know options were saved.
var status = document.getElementById("status");
status.innerHTML = _strSaved;
status.style.display = "block";
setTimeout(function() {status.style.display = "none";}, 3000);
} else {
alert(_strPwdMatch);
document.getElementById("password").value = "";
document.getElementById("passwordConfirm").value = "";
}
}
function loadStrings() {
_strSaved = chrome.i18n.getMessage("opt_strSaved");
_strPwdMatch = chrome.i18n.getMessage("opt_pwdMatch");
document.title = chrome.i18n.getMessage("opt_title");
document.getElementById("lblSetPwd").innerHTML = chrome.i18n.getMessage("opt_setPwd");
document.getElementById("lblPwd").innerHTML = chrome.i18n.getMessage("opt_lblPwd");
document.getElementById("lblPwdConf").innerHTML = chrome.i18n.getMessage("opt_lblPwdConf");
document.getElementById("btnSave").value = chrome.i18n.getMessage("opt_btnSave");
}
function passwordIsSecure(password) {
if (password && password.length > 4){
if (password.match(/([0-9]|\[|\\|\^|\$|\.|\||\?|\*|\+|\(|\)|\{|\}|!|@|#|%|&|_|=|-|`|~|<|>|\/)/i))
return true;
}
return false;
}
function setSecurePhoto(password) {
if (password == "")
document.getElementById("imgPassSet").src = "images/decrypted.png";
else {
if (passwordIsSecure(password))
document.getElementById("imgPassSet").src = "images/encrypted.png";
else
document.getElementById("imgPassSet").src = "images/halfencrypted.png";
}
}
function body_onload() {
loadStrings();
setSecurePhoto(localStorage["password"]);
}
</script>
<style type="text/css">
#status {
position: absolute;
top: 0px;
left: 0px;
background-color: #C0C0C0;
opacity: 0.9;
display: none;
width: 100%;
height: 100%;
padding-top: 25%;
text-align: center;
font-family: "Times New Roman", Times, serif;
font-size: xx-large;
}
</style>
<div id="status"></div>
<table id="setPassword">
<tr>
<th colspan="2">
<div id="lblSetPwd"></div>
</th>
<td rowspan="4">
<img id="imgPassSet" src="images/decrypted.png" width="50px" />
</td>
</tr>
<tr>
<td>
<div id="lblPwd"></div>
</td>
<td>
<input type="password" id="password" onchange="setSecurePhoto(this.value);" />
</td>
</tr>
<tr>
<td>
<div id="lblPwdConf"></div>
</td>
<td>
<input type="password" id="passwordConfirm" onfocus="this.value='';" />
</td>
</tr>
<tr>
<td colspan="2" align="right">
<input type="button" onclick="saveOptions()" id="btnSave" />
</td>
</tr>
</table>
</body>
</html>
这是来自 encryption.js 的 javascript
/**
*
* MD5 (Message-Digest Algorithm)
* http://www.webtoolkit.info/
*
**/
var MD5 = function (string) {
function RotateLeft(lValue, iShiftBits) {
return (lValue<<iShiftBits) | (lValue>>>(32-iShiftBits));
}
function AddUnsigned(lX,lY) {
var lX4,lY4,lX8,lY8,lResult;
lX8 = (lX & 0x80000000);
lY8 = (lY & 0x80000000);
lX4 = (lX & 0x40000000);
lY4 = (lY & 0x40000000);
lResult = (lX & 0x3FFFFFFF)+(lY & 0x3FFFFFFF);
if (lX4 & lY4) {
return (lResult ^ 0x80000000 ^ lX8 ^ lY8);
}
if (lX4 | lY4) {
if (lResult & 0x40000000) {
return (lResult ^ 0xC0000000 ^ lX8 ^ lY8);
} else {
return (lResult ^ 0x40000000 ^ lX8 ^ lY8);
}
} else {
return (lResult ^ lX8 ^ lY8);
}
}
function F(x,y,z) { return (x & y) | ((~x) & z); }
function G(x,y,z) { return (x & z) | (y & (~z)); }
function H(x,y,z) { return (x ^ y ^ z); }
function I(x,y,z) { return (y ^ (x | (~z))); }
function FF(a,b,c,d,x,s,ac) {
a = AddUnsigned(a, AddUnsigned(AddUnsigned(F(b, c, d), x), ac));
return AddUnsigned(RotateLeft(a, s), b);
};
function GG(a,b,c,d,x,s,ac) {
a = AddUnsigned(a, AddUnsigned(AddUnsigned(G(b, c, d), x), ac));
return AddUnsigned(RotateLeft(a, s), b);
};
function HH(a,b,c,d,x,s,ac) {
a = AddUnsigned(a, AddUnsigned(AddUnsigned(H(b, c, d), x), ac));
return AddUnsigned(RotateLeft(a, s), b);
};
function II(a,b,c,d,x,s,ac) {
a = AddUnsigned(a, AddUnsigned(AddUnsigned(I(b, c, d), x), ac));
return AddUnsigned(RotateLeft(a, s), b);
};
function ConvertToWordArray(string) {
var lWordCount;
var lMessageLength = string.length;
var lNumberOfWords_temp1=lMessageLength + 8;
var lNumberOfWords_temp2=(lNumberOfWords_temp1-(lNumberOfWords_temp1 % 64))/64;
var lNumberOfWords = (lNumberOfWords_temp2+1)*16;
var lWordArray=Array(lNumberOfWords-1);
var lBytePosition = 0;
var lByteCount = 0;
while ( lByteCount < lMessageLength ) {
lWordCount = (lByteCount-(lByteCount % 4))/4;
lBytePosition = (lByteCount % 4)*8;
lWordArray[lWordCount] = (lWordArray[lWordCount] | (string.charCodeAt(lByteCount)<<lBytePosition));
lByteCount++;
}
lWordCount = (lByteCount-(lByteCount % 4))/4;
lBytePosition = (lByteCount % 4)*8;
lWordArray[lWordCount] = lWordArray[lWordCount] | (0x80<<lBytePosition);
lWordArray[lNumberOfWords-2] = lMessageLength<<3;
lWordArray[lNumberOfWords-1] = lMessageLength>>>29;
return lWordArray;
};
function WordToHex(lValue) {
var WordToHexValue="",WordToHexValue_temp="",lByte,lCount;
for (lCount = 0;lCount<=3;lCount++) {
lByte = (lValue>>>(lCount*8)) & 255;
WordToHexValue_temp = "0" + lByte.toString(16);
WordToHexValue = WordToHexValue + WordToHexValue_temp.substr(WordToHexValue_temp.length-2,2);
}
return WordToHexValue;
};
function Utf8Encode(string) {
string = string.replace(/\r\n/g,"\n");
var utftext = "";
for (var n = 0; n < string.length; n++) {
var c = string.charCodeAt(n);
if (c < 128) {
utftext += String.fromCharCode(c);
}
else if((c > 127) && (c < 2048)) {
utftext += String.fromCharCode((c >> 6) | 192);
utftext += String.fromCharCode((c & 63) | 128);
}
else {
utftext += String.fromCharCode((c >> 12) | 224);
utftext += String.fromCharCode(((c >> 6) & 63) | 128);
utftext += String.fromCharCode((c & 63) | 128);
}
}
return utftext;
};
var x=Array();
var k,AA,BB,CC,DD,a,b,c,d;
var S11=7, S12=12, S13=17, S14=22;
var S21=5, S22=9 , S23=14, S24=20;
var S31=4, S32=11, S33=16, S34=23;
var S41=6, S42=10, S43=15, S44=21;
string = Utf8Encode(string);
x = ConvertToWordArray(string);
a = 0x67452301; b = 0xEFCDAB89; c = 0x98BADCFE; d = 0x10325476;
for (k=0;k<x.length;k+=16) {
AA=a; BB=b; CC=c; DD=d;
a=FF(a,b,c,d,x[k+0], S11,0xD76AA478);
d=FF(d,a,b,c,x[k+1], S12,0xE8C7B756);
c=FF(c,d,a,b,x[k+2], S13,0x242070DB);
b=FF(b,c,d,a,x[k+3], S14,0xC1BDCEEE);
a=FF(a,b,c,d,x[k+4], S11,0xF57C0FAF);
d=FF(d,a,b,c,x[k+5], S12,0x4787C62A);
c=FF(c,d,a,b,x[k+6], S13,0xA8304613);
b=FF(b,c,d,a,x[k+7], S14,0xFD469501);
a=FF(a,b,c,d,x[k+8], S11,0x698098D8);
d=FF(d,a,b,c,x[k+9], S12,0x8B44F7AF);
c=FF(c,d,a,b,x[k+10],S13,0xFFFF5BB1);
b=FF(b,c,d,a,x[k+11],S14,0x895CD7BE);
a=FF(a,b,c,d,x[k+12],S11,0x6B901122);
d=FF(d,a,b,c,x[k+13],S12,0xFD987193);
c=FF(c,d,a,b,x[k+14],S13,0xA679438E);
b=FF(b,c,d,a,x[k+15],S14,0x49B40821);
a=GG(a,b,c,d,x[k+1], S21,0xF61E2562);
d=GG(d,a,b,c,x[k+6], S22,0xC040B340);
c=GG(c,d,a,b,x[k+11],S23,0x265E5A51);
b=GG(b,c,d,a,x[k+0], S24,0xE9B6C7AA);
a=GG(a,b,c,d,x[k+5], S21,0xD62F105D);
d=GG(d,a,b,c,x[k+10],S22,0x2441453);
c=GG(c,d,a,b,x[k+15],S23,0xD8A1E681);
b=GG(b,c,d,a,x[k+4], S24,0xE7D3FBC8);
a=GG(a,b,c,d,x[k+9], S21,0x21E1CDE6);
d=GG(d,a,b,c,x[k+14],S22,0xC33707D6);
c=GG(c,d,a,b,x[k+3], S23,0xF4D50D87);
b=GG(b,c,d,a,x[k+8], S24,0x455A14ED);
a=GG(a,b,c,d,x[k+13],S21,0xA9E3E905);
d=GG(d,a,b,c,x[k+2], S22,0xFCEFA3F8);
c=GG(c,d,a,b,x[k+7], S23,0x676F02D9);
b=GG(b,c,d,a,x[k+12],S24,0x8D2A4C8A);
a=HH(a,b,c,d,x[k+5], S31,0xFFFA3942);
d=HH(d,a,b,c,x[k+8], S32,0x8771F681);
c=HH(c,d,a,b,x[k+11],S33,0x6D9D6122);
b=HH(b,c,d,a,x[k+14],S34,0xFDE5380C);
a=HH(a,b,c,d,x[k+1], S31,0xA4BEEA44);
d=HH(d,a,b,c,x[k+4], S32,0x4BDECFA9);
c=HH(c,d,a,b,x[k+7], S33,0xF6BB4B60);
b=HH(b,c,d,a,x[k+10],S34,0xBEBFBC70);
a=HH(a,b,c,d,x[k+13],S31,0x289B7EC6);
d=HH(d,a,b,c,x[k+0], S32,0xEAA127FA);
c=HH(c,d,a,b,x[k+3], S33,0xD4EF3085);
b=HH(b,c,d,a,x[k+6], S34,0x4881D05);
a=HH(a,b,c,d,x[k+9], S31,0xD9D4D039);
d=HH(d,a,b,c,x[k+12],S32,0xE6DB99E5);
c=HH(c,d,a,b,x[k+15],S33,0x1FA27CF8);
b=HH(b,c,d,a,x[k+2], S34,0xC4AC5665);
a=II(a,b,c,d,x[k+0], S41,0xF4292244);
d=II(d,a,b,c,x[k+7], S42,0x432AFF97);
c=II(c,d,a,b,x[k+14],S43,0xAB9423A7);
b=II(b,c,d,a,x[k+5], S44,0xFC93A039);
a=II(a,b,c,d,x[k+12],S41,0x655B59C3);
d=II(d,a,b,c,x[k+3], S42,0x8F0CCC92);
c=II(c,d,a,b,x[k+10],S43,0xFFEFF47D);
b=II(b,c,d,a,x[k+1], S44,0x85845DD1);
a=II(a,b,c,d,x[k+8], S41,0x6FA87E4F);
d=II(d,a,b,c,x[k+15],S42,0xFE2CE6E0);
c=II(c,d,a,b,x[k+6], S43,0xA3014314);
b=II(b,c,d,a,x[k+13],S44,0x4E0811A1);
a=II(a,b,c,d,x[k+4], S41,0xF7537E82);
d=II(d,a,b,c,x[k+11],S42,0xBD3AF235);
c=II(c,d,a,b,x[k+2], S43,0x2AD7D2BB);
b=II(b,c,d,a,x[k+9], S44,0xEB86D391);
a=AddUnsigned(a,AA);
b=AddUnsigned(b,BB);
c=AddUnsigned(c,CC);
d=AddUnsigned(d,DD);
}
var temp = WordToHex(a)+WordToHex(b)+WordToHex(c)+WordToHex(d);
return temp.toLowerCase();
}
我注意到密码提示是从这一行触发的：
var password = prompt(chrome.i18n.getMessage("bg_EnterPass"));
在谷歌开发者网站上阅读.i18n.getMessage，但没有提及如何屏蔽此文本。只剩下prompt()javascript函数，我只搜索了一种方法来掩盖这个提示，但找不到任何解决方案。有 jQuery 插件，但我无法获得所需的输出。我尝试了Impromptu Plugin，但不知道如何var password从 $.prompt();返回值 通过该插件运行。
有人可以帮助我吗？或者建议一个更好的替代这个 chrome 扩展？