Crypto-JS总是返回新的哈希

时间:2019-09-26 20:31:21

标签: javascript angular cryptojs

我想在我的angular 8应用程序上使用crypto-js
这是我的示例代码:

import {Injectable} from '@angular/core';
import * as CryptoJS from 'crypto-js';

@Injectable()
export class HprotoService {

  public enc(msg: string): string {
    return CryptoJS.AES.encrypt(msg, '1234').toString();
  }

  public dec(encMsg: string): string {
    return CryptoJS.AES.decrypt(encMsg, '1234').toString(CryptoJS.enc.Utf8);
  }
}

和我的组件:

import {Component} from '@angular/core';
import {HprotoService} from './hproto.service';

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.scss']
})
export class AppComponent {

  private hproto: HprotoService;

  constructor(hproto: HprotoService) {
    this.hproto = hproto;
  }

  public encrypt() {
    console.log(this.hproto.enc('Hello dear !!!'));
  }
}

我的问题是Crypto-JS在此示例中总是返回不同的哈希值!

  

U2FsdGVkX19E9JKokPiRUZlrWsykZqAIEVw7ftbBbiA =
  U2FsdGVkX1 + 8qW19xOpLCy1Zt5lcyxE3LIKrhs5VmjI =
  U2FsdGVkX1 / I2AuJM3jBgHuASmWQvkgmaL0RMsR2LXA =
  U2FsdGVkX1 + tR17ftLYsWGoEcRA0 + zmSjkLHJE3zul0 =

我认为该库在我的密码上添加了随机盐。
如何禁用此功能?

1 个答案:

答案 0 :(得分:3)

AES旨在生成对称的随机输出(可以解密)

CryptoJS AES在加密过程中使用Math.random()调用来生成矩阵/盐,并且此随机性包含在加密结果中,这就是解密如何“解密”加密数据的方式。 / p>

您可以 分叉CryptoJS库,并用自己的种子替换Math.random使用情况 ,也可以 更改{ {1}}在加密期间运行。

借助Javascript,您可以将自定义代码分配给Math.random

这里是选项#2。它将始终返回相同的输出,它使用函数native function。这将在回调函数持续时间内暂时更改fakeMathRandom的结果

fakeMathRandom函数

Math.random

用法

function fakeMathRandom(callBack) {
     if(!callBack) throw new Error("Must provide callBack function");
     //fake predefined output setup
     let seed=0;
     const randomOutputs = [0.04,0.08,0.15,0.16,0.23,0.42,0.52,0.65,0.79,0.89];
     //save nativeFunction
     const Math_random = Math.random;
     //change nativeFunction
     Math.random = function() {return randomOutputs[seed++ % 10];}
     //runs the callback
     const callbackOutput = callBack();
     //restore nativeFunction
     Math.random = Math_random; 
     return callbackOutput;
}

完整的演示代码:

var encrypted = fakeMathRandom(() => CryptoJS.AES.encrypt(text, key));
function fakeMathRandom(callBack) {
  if(!callBack) throw new Error("Must provide callBack function");
	let seed=0;
  const randomOutputs = [0.04,0.08,0.15,0.16,0.23,0.42,0.52,0.65,0.79,0.89];
  const Math_random = Math.random;
  Math.random = function() {return randomOutputs[seed++ % 10];}
  const callbackOutput = callBack();
  Math.random = Math_random;
  return callbackOutput;
}

var text = "Text to crypt!!!.";
var key  = 'secret';

var encrypted = fakeMathRandom(() => CryptoJS.AES.encrypt(text, key)); //This will always return U2FsdGVkX18KPXCjFHrhR4Q5zBbjCf+I/m/w9jbS3EuvE59kzUxK45FrGHDpqalt
var encrypted2 = fakeMathRandom(() => CryptoJS.AES.encrypt(text, key));
var encrypted3 = fakeMathRandom(() => CryptoJS.AES.encrypt(text, key));

var decrypted = CryptoJS.AES.decrypt(encrypted, key).toString(CryptoJS.enc.Utf8);


document.getElementById('encrypted').innerHTML = encrypted
document.getElementById('encrypted2').innerHTML = encrypted2
document.getElementById('encrypted3').innerHTML = encrypted3
document.getElementById('decrypted').innerHTML = decrypted

我希望能解决您的问题!