在javascript中加密对象 [英] encrypting an object in javascript

问题描述

var Obj = {};
Obj.ID = e.row.ID;
Obj.firstName = e.row.firstName;
Obj.lastName = e.row.lastName;

这是我的对象，我将此对象保存在一个文件中。现在在保存到文件之前，我想加密它并保存并在阅读时我想要解密和阅读。

This is my object, and i save this object in a file. now before saving into file, i want to encrypt it and save and while reading i want to decrypt and read.

var newFile = FileSystemPath;
newFile.write(JSON.stringify(object));

1. 我应该在对象之前或之后对对象进行加密。


2. 在javascript中加密对象的方法有哪些。任何示例
   都会很棒。

推荐答案

你无法真正加密对象，但你可以加密字符串，所以你应该首先做一个对象序列化（ JSON.stringify ）然后用对称加密算法加密它，这样你就可以解码这个对象以后。

我真的不能提供一个很好的例子，因为javascript总会有严重的安全问题（作为客户端编程语言），即使你尝试了一个相当复杂的算法（如如 AES ）它仍然容易受到攻击，因为用户只能看到您的源代码，因此请参阅你的编码/解密算法。

如果你只是想稍微改变字符串以便在第一眼看就无法解密，你可以简单地使用一些内置的javascript方法（例如encodeURI / decodeURI）或者你可以做一些字符repl acements甚至使用 salts 。

You can't really encrypt objects, but you can encrypt strings, so you should probably first do a object serialization (JSON.stringify) and then encrypt it with a symmetric encryption algorithm so you would be able to decode the object later.
I can't really provide a good example, because javascript will always have serious security problems (being a client-side programming language), and even if you try a rather complex algorithm (such as AES) it will still be vulnerable, because the user can just see your source code, thus see your encription/decription algorithms.
If you just want to alter the string a bit so it can't be deciphered on the first look, you can simply use some built-in javascript methods (such as encodeURI/decodeURI) or you can do some character replacements or even use salts.

以下是如何加密对象的示例演示：

Here's a sample demo of how you can "encrypt" an object :

function encript(o, salt) {
    o = JSON.stringify(o).split('');
    for(var i = 0, l = o.length; i < l; i++)
        if(o[i] == '{')
            o[i] = '}';
        else if(o[i] == '}')
            o[i] = '{';
    return encodeURI(salt + o.join(''));
}

 function decript(o, salt) {
    o = decodeURI(o);
    if(salt && o.indexOf(salt) != 0)
        throw new Error('object cannot be decripted');
    o = o.substring(salt.length).split('');
    for(var i = 0, l = o.length; i < l; i++)
        if(o[i] == '{')
            o[i] = '}';
        else if(o[i] == '}')
            o[i] = '{';
    return JSON.parse(o.join(''));
}

var obj = {
    key : 'value',
    3 : 1
};
var salt = "some string here";
var encripted = encript(obj, salt);
var decripted = decript(encripted, salt);

当然，这只是一个例子，您应该修改它以便识别更复杂的对象，你需要ecnript函数，或者对象有循环引用的地方。

Of course, this is just an example and you should modify it in order to encript more complex objects, where you need to ecnript functions, or where the object has circular references.

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