Changeset - 64020ac8e211
Parent rev.
Child rev.
[Not reviewed]
default
0 3 0
Laman - 5 years ago 2019-07-05 13:46:34

added key stretching with PBKDF2
3 files changed with 29 insertions and 8 deletions:
src/blake.js
5
src/chacha.js
1
1
src/main.js
23
7
0 comments (0 inline, 0 general)
src/blake.js
➞
Show inline comments
 
// https://tools.ietf.org/html/rfc7693
 
import {MASK,int32s2bytes,bytes2int32s,zeroPad} from "./util.js";
 

			




	
	
	
		
 
const BLOCK_LEN=64;

			




	
	
	
		
 

			




	
	
	
		
 
const IV=[0x6A09E667,0xBB67AE85,0x3C6EF372,0xA54FF53A,0x510E527F,0x9B05688C,0x1F83D9AB,0x5BE0CD19];

			




	
	
	
		
 

			




	
	
	
		
 
function rrot(x,shift){

			




	
	
	
		
 
	return ((x>>>shift)|(x<<(32-shift)))&MASK;

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/**

			




	
	
	
		
 
 * @param {number} outputLen output length in bytes, 1<=x<=32

			




	
	
	
		
 
 * @param {Array} key byte array, 0<=key.length<=32

			




	
	
	
		
 
 * @returns {BLAKE2S}

			




	
	
	
		
 
 */

			




	
	
	
		
 
export function BLAKE2S(outputLen=32,key=[]){

			




	
	
	
		
 
	this._buffer=[];

			




	
	
	
		
 
	this._dataLen=[0,0]; // low, high

			




	
	
	
		
 
	this._outputLen=outputLen;

			




	
	
	
		
 
	

			




	
	
	
		
 
	this._state=IV.slice();

			




	
	
	
		
 
	this._state[0]^=0x01010000^(key.length<<8)^this._outputLen;

			




	
	
	
		
 
	

			




	
	
	
		
 
	if(key.length>0){this.update(zeroPad(key,BLOCK_LEN));}

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
BLAKE2S.prototype.update=function(data){

			




	
	
	
		
 
	for(let i=0;i<data.length;i++){

			




	
	
	
		
 
		if(this._buffer.length==BLOCK_LEN){

			




	
	
	
		
 
			this._compress(false);

			




	
	
	
		
 
			this._buffer=[];

			




	
	
	
		
 
		}

			




	
	
	
		
 
		this._buffer.push(data[i]);

			




	
	
	
		
 
		this._dataLen[0]=(this._dataLen[0]+1)&MASK;

			




	
	
	
		
 
		if(this._dataLen[0]<this._buffer.length){this._dataLen[1]++;}

			




	
	
	
		
 
	}

			




	
	
	
		
 
};

			




	
	
	
		
 

			




	
	
	
		
 
BLAKE2S.prototype.digest=function(){

			




        

    


    
    

    

        

                

                    src/chacha.js
                

                

                  
                      
                        

                      ➞

                      
                        
                  

                  
                      
                  
                      
                  
                      
                  
                      
                  
                  
                

                

                    Show inline comments
                    
                

        

        

            



	
	
	
		
 
// https://tools.ietf.org/html/rfc7539

			




	
	
	
		
 
import {MASK,int32s2bytes,bytes2int32s,zeroPad} from "./util.js";

			




	
	
	
		
 

			




	
	
	
		
 
function lrot(x,shift){

			




	
	
	
		
 
	return (x<<shift|x>>>(32-shift))&MASK;

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
function createNonce(){

			




	
	
	
		
 
export function createNonce(){

			




	
	
	
		
 
	let nonce=new Uint8Array(12);

			




	
	
	
		
 
	window.crypto.getRandomValues(nonce);

			




	
	
	
		
 
	return Array.from(nonce);

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
/**

			




	
	
	
		
 
 * A Chacha20 cipher class.

			




	
	
	
		
 
 * @param {Array} key Array of bytes (integers: 0<=x<256). Short keys are padded to 32B, long keys are silently truncated.

			




	
	
	
		
 
 * @param {Array} nonce optional. If present, it must be an Array of bytes (integers: 0<=x<256). Short nonces are padded to 12B, long nonces are silently truncated.

			




	
	
	
		
 
 */

			




	
	
	
		
 
export function Chacha20(key,nonce){

			




	
	
	
		
 
	if(nonce===undefined){

			




	
	
	
		
 
		nonce=createNonce();

			




	
	
	
		
 
	}

			




	
	
	
		
 
	this._nonce=zeroPad(nonce,12);

			




	
	
	
		
 
	nonce=bytes2int32s(this._nonce);

			




	
	
	
		
 
	key=bytes2int32s(zeroPad(key,32));

			




	
	
	
		
 
	

			




	
	
	
		
 
	this._state=[

			




	
	
	
		
 
		0x61707865,0x3320646e,0x79622d32,0x6b206574,

			




	
	
	
		
 
		key[0],key[1],key[2],key[3],

			




	
	
	
		
 
		key[4],key[5],key[6],key[7],

			




	
	
	
		
 
		1,nonce[0],nonce[1],nonce[2]

			




	
	
	
		
 
	];

			




        

    


    
    

    

        

                

                    src/main.js
                

                

                  
                      
                        

                      ➞

                      
                        
                  

                  
                      
                  
                      
                  
                      
                  
                      
                  
                  
                

                

                    Show inline comments
                    
                

        

        

            



	
	
	
		
 
import * as util from "./util.js";

			




	
	
	
		
 
import {blake2s} from "./blake.js";

			




	
	
	
		
 
import {pbkdf2} from "./pbkdf2.js";

			




	
	
	
		
 
import {Chacha20,encrypt as _encrypt,decrypt as _decrypt} from "./chacha.js";

			




	
	
	
		
 
import {createNonce,Chacha20,encrypt as _encrypt,decrypt as _decrypt} from "./chacha.js";

			




	
	
	
		
 

			




	
	
	
		
 
const VERSION=1;

			




	
	
	
		
 

			




	
	
	
		
 
function encrypt(s,password){

			




	
	
	
		
 
	let bs=util.str2utf8(s);

			




	
	
	
		
 
	let pass=util.str2utf8(password);

			




	
	
	
		
 
	let noncedCiphertext=_encrypt(bs,pass);

			




	
	
	
		
 
	let signature=blake2s([VERSION].concat(noncedCiphertext),16,pass);

			




	
	
	
		
 
	let arr=[VERSION].concat(signature,noncedCiphertext);

			




	
	
	
		
 
	let salt=createNonce();

			




	
	
	
		
 
	let [iters,key]=stretchKey(pass,salt);

			




	
	
	
		
 
	let noncedCiphertext=_encrypt(bs,key,salt);

			




	
	
	
		
 
	let payload=[iters].concat(noncedCiphertext);

			




	
	
	
		
 
	let signature=blake2s([VERSION].concat(payload),16,pass);

			




	
	
	
		
 
	let arr=[VERSION].concat(signature,payload);

			




	
	
	
		
 
	return util.bytes2base64(arr);

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
function decrypt(s,password){

			




	
	
	
		
 
	let pass=util.str2utf8(password);

			




	
	
	
		
 
	let arr=util.base642bytes(s);

			




	
	
	
		
 
	let version=arr[0];

			




	
	
	
		
 
	let signature=arr.slice(1,17);

			




	
	
	
		
 
	let noncedCiphertext=arr.slice(17);

			




	
	
	
		
 
	let check=blake2s([version].concat(noncedCiphertext),16,pass);

			




	
	
	
		
 
	let iters=arr[17];

			




	
	
	
		
 
	let salt=arr.slice(18,30);

			




	
	
	
		
 
	let noncedCiphertext=arr.slice(18);

			




	
	
	
		
 
	let check=blake2s([version].concat([iters],noncedCiphertext),16,pass);

			




	
	
	
		
 
	if(!signature.every((b,i)=>b===check[i])){return false;}

			




	
	
	
		
 
	if(version>VERSION){return false;}

			




	
	
	
		
 
	let plainbytes=_decrypt(noncedCiphertext,pass);

			




	
	
	
		
 
	let key=pbkdf2(pass,salt,1<<iters,32);

			




	
	
	
		
 
	let plainbytes=_decrypt(noncedCiphertext,key);

			




	
	
	
		
 
	return util.utf82str(plainbytes);

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
function stretchKey(password,salt){

			




	
	
	
		
 
	let start=Date.now(); // ms

			




	
	
	
		
 
	let i,key;

			




	
	
	
		
 
	for(i=0;i<256;i++){

			




	
	
	
		
 
		key=pbkdf2(password,salt,1<<i,32);

			




	
	
	
		
 
		if(Date.now()-start>=500){break;}

			




	
	
	
		
 
	}

			




	
	
	
		
 
	return [i,key];

			




	
	
	
		
 
}

			




	
	
	
		
 

			




	
	
	
		
 
export default {util,blake2s,pbkdf2,Chacha20,encrypt,decrypt};

			




	
	
	
		
 

			




	
	
	
		
 
// export for tests running on Node

			




	
	
	
		
 
if(typeof module!=='undefined'&&module.hasOwnProperty('exports')){

			




	
	
	
		
 
	module.exports.util=util;

			




	
	
	
		
 
	module.exports.blake2s=blake2s;

			




	
	
	
		
 
	module.exports.pbkdf2=pbkdf2;

			




	
	
	
		
 
	module.exports.Chacha20=Chacha20;

			




	
	
	
		
 
	module.exports.encrypt=_encrypt;

			




	
	
	
		
 
	module.exports.decrypt=_decrypt;

			




	
	
	
		
 
}

			




        

    



    


    



    



      

      





    
    0 comments (0 inline, 0 general)
    





    


  

  







  


    




    








    
        Server instance: Sirius-557
    
    
        This site is powered by
            Kallithea 0.7.0,
        which is
        © 2010–2023 by various authors & licensed under GPLv3.
            – Support