How to use AES.encrypt/AES.decrypt?

[espruino-discuss]

Posted at 2017-10-20 by sureshkm

Can someone please explain me how to generate the key?

key - Key to encrypt message - must be an ArrayBuffer of 128, 192, or
256 BITS

[espruino-discuss]

Posted at 2017-10-20 by ClearMemory041063

Try something like this

//RNG.js

// Generates a 16 byte block of random numbers using AES
 //RNG.js
function RNG(){
 this.key1=new Uint8Array(16);
 this.R=new Uint8Array(16);
 this.plain=new Uint8Array(16);
}//end RNG

RNG.prototype.random=function(A){
var i;
E.srand(E.hwRand()); //randomize
  for(i=0;i<16;i++)this.plain[i]=(Math.random()*256)%256;
  this.R=AES.encrypt(this.plain,this.key1);
  for(i=0;i<16;i++)A[i]=this.R[i];
};//end random

RNG.prototype.setup_random=function(){
 for(var i=0;i<16;i++){
  E.srand(E.hwRand());
  this.key1[i]=parseInt((Math.random()*256),10);
 }
};//end setup_random

//exports = RNG;


function testit(){
 var i;
 var A=new Uint8Array(16);
// var W=new (require("RNG"))();
 var W=new RNG();
 W.setup_random();
  for(i=0;i<16;i++){
   W.random(A);
   console.log(A);
  }
}

testit();

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Posted at 2017-10-21 by sureshkm

Thank you! @ClearMemory041063 I will try that.

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Posted at 2017-10-23 by @gfwilliams

Thanks @ClearMemory041063 - @sureshkm you basically just need to generate a random series of bytes for the array, as in the code above.

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Posted at 2017-10-23 by sureshkm

@gfwilliams Thank you!