node 上的cookie的签名和解签名

cookie签名的原因是防止别人篡改cookie原本的值，如果这个过程中cookie被改变的话，就会在unsign方法返回false

代码：

var cookie = require("cookie-signature")
var val = cookie.sign('hello', 'tobiiscool');
console.log(val);
var val = cookie.sign('hello', 'tobiiscool');
console.log(cookie.unsign(val, 'tobiiscool'));

参考：https://npm.runkit.com/cookie-signature

实际node例子：

var express = require('express');
var cookieParser = require('cookie-parser');//cookie模块
var cookie = require("cookie-signature");//签名模块
var util = require('util');
var app = express();

app.use(cookieParser());//注入cookie模块

//cookie获取模块
app.get('/getc',function(req,res){
    console.log('取得的cookie:'+req.cookies.cookiename);
    console.log('取得的cookieSercret:'+req.cookies.resc);

    var val = cookie.sign('hello', 'tobiiscool');
    console.log("cookie验证后签名：" + cookie.unsign(val,'tobiiscool'));
    res.end('cookies get ok');
});

//删除指定cookie模块
app.get('/del_c',function(req,res){
    res.clearCookie('cookiename');
    res.send('ok');
});

//获取cookie模块
app.get('/',function(req,res){
    res.cookie('resc', '设置到cookie里的值', { expires: new Date(Date.now() + 900000), httpOnly: true });
    var val = cookie.sign('cookiecontent', 'tobiiscool');
    res.cookie('cookiename',val,{expires: new Date(Date.now() + 900000), path:'/',httpOnly: true });
    console.log("Cookies: " + util.inspect(req.cookies));

    console.log("cookie签名后："+val);

    res.send('ok');
});

app.listen(8081);