NODEJS(11)Platform

11lxm

　　NODEJS(11)Platform - AUTH- AES

1. AES - Introduction
DES-3DES-AES (Advanced Encryption Standard)

First to know
HEX is twice length of normal string. For example>
http://www.string-functions.com/string-hex.aspx
string(string) ——> HEX(737472696e67)

Second to know
List all the algorithms we support
>openssl list-cipher-algorithms

2. AES - Implementation
sillycat-aes/lib/app.js
var crypto = require('crypto');

module.exports = {
    
     defaultAlgorithm: 'aes-256-cbc',
     defaultFormat: 'hex',
     ivLength: 16,

     encrypt : function(data, key){
          algorithm = this.defaultAlgorithm;
          format = this.defaultFormat;
         
          var iv = crypto.randomBytes(this.ivLength);

          var cipher = crypto.createCipheriv(algorithm, new Buffer(key, 'hex'), iv);
          var encrypted = cipher.update(data, 'utf8', format) + cipher.final(format);
          //put the vector at the beginning
          return iv.toString('hex') + encrypted;
     },

     decrypt :     function(data, key){
          algorithm = this.defaultAlgorithm;
          format = this.defaultFormat;

          var ivLength = this.ivLength * 2;

          var iv = new Buffer(data.substring(0, ivLength), 'hex');
          //get the vector from the begging of the string, hex is twice length the string
          data = data.substring(ivLength);

          var decipher = crypto.createDecipheriv(algorithm, new Buffer(key, 'hex'), iv);
          var decrypted = decipher.update(data, format, 'utf8') + decipher.final('utf8');

          return decrypted;
     }
};

Here is the test class
sillcat-aes/test/encryptAndDecrypt.js
require("should");
var crypto = require('crypto');
var AESTool = require("../lib/app");

describe("Encrypt&Decrypt String", function(){
     it("should encrypt&decrypt string password", function(){
          console.log("");
          var key = crypto.randomBytes(32);
          var raw_data = "I love nodejs, I used to use javascript for a long time!";
          var secret_data = AESTool.encrypt(raw_data, key);
          console.log("raw_data is    = " + raw_data);
          console.log("secret data is = " + secret_data);
          var decrypt_data = AESTool.decrypt(secret_data, key);
          console.log("decrypt data is= " + decrypt_data);
          decrypt_data.should.equal(raw_data);
     });
});

3. Build the Test Case
>sudo npm install -g mocha
global install the mocha tool in my local machine.

value.should.be.a(‘object’).and.have.property(’name’, ‘Pedro’);

true.shuld.be.ok
false.should.ot.be.ok;
15.should.be.within(10,20);
“502”.should.match(/[0-9]{3}/);
[1,2,3].should.have.length(3);
“abcdef”.should.include.string(‘bc’);
{a:1,b:2}.should.be.a(‘object’);
“test”.should.be.a(“string");

Then, try to run the test cases like this>
>mocha test/*.js
raw_data is    = I love nodejs, I used to use javascript for a long time! secret data is = 39f8bdc4e8087fd4c53195702522db82c5bf60771fedfa765ea8b7d7ea6a69c29f09054a13c1a1e4d1ae52e285ebdc5ea62fe649e64781888626febfc384a3c3c7e306ae319ed586892009fc6596a890 decrypt data is= I love nodejs, I used to use javascript for a long time!

References:
AES Encrypt and Decrypt
http://blog.csdn.net/searchsun/article/details/2516191
http://nodejs.org/api/crypto.html
http://www.360doc.com/content/10/0326/17/229143_20367618.shtml
http://snoopyxdy.blog.163.com/blog/static/601174402012730105523656/

http://sillycat.iteye.com/blog/1468900

Dependency Injection
https://github.com/harmonyjs/dependency-injection