CryptoJS Changeset - 51344a25b55d

Changeset - 51344a25b55d

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Laman - 5 years ago 2019-06-30 16:33:14

array padding refactored into util

3 files changed with 8 insertions and 12 deletions:

src/blake.js

src/chacha.js

src/util.js

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src/blake.js

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 // https://tools.ietf.org/html/rfc7693
 import {MASK,int32s2bytes,bytes2int32s} from "./util.js";
+import {MASK,int32s2bytes,bytes2int32s,zeroPad} from "./util.js";
 const BLOCK_LEN=64;
 const IV=[0x6A09E667,0xBB67AE85,0x3C6EF372,0xA54FF53A,0x510E527F,0x9B05688C,0x1F83D9AB,0x5BE0CD19];
 function padEnd(arr,length,val=0){
 	return arr.concat((new Array(length-arr.length)).fill(0));
+}
 function rrot(x,shift){
 	return ((x>>>shift)|(x<<(32-shift)))&MASK;
+}
 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(padEnd(key,BLOCK_LEN,0));}
+	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(){
-	this._buffer=padEnd(this._buffer,BLOCK_LEN,0);
+	this._buffer=zeroPad(this._buffer,BLOCK_LEN);
 	this._compress(true);
 	return int32s2bytes(this._state).slice(0,this._outputLen);
 };
 BLAKE2S.prototype._compress=function(last){
 	const SIGMA=[
 		[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15],
 		[14,10,4,8,9,15,13,6,1,12,0,2,11,7,5,3],
 		[11,8,12,0,5,2,15,13,10,14,3,6,7,1,9,4],
 		[7,9,3,1,13,12,11,14,2,6,5,10,4,0,15,8],
 		[9,0,5,7,2,4,10,15,14,1,11,12,6,8,3,13],
 		[2,12,6,10,0,11,8,3,4,13,7,5,15,14,1,9],

src/chacha.js

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 // https://tools.ietf.org/html/rfc7539
 import {MASK,int32s2bytes,bytes2int32s} from "./util.js";
+import {MASK,int32s2bytes,bytes2int32s,zeroPad} from "./util.js";
 function lrot(x,shift){
 	return (x<<shift|x>>>(32-shift))&MASK;
+}
 function createNonce(){
 	let nonce=new Uint8Array(12);
 	window.crypto.getRandomValues(nonce);
 	return nonce;
+}
 function zeroPad(arr,length){
 	return arr.concat((new Array(length)).fill(0)).slice(0,length);
+}
 /**
  * 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));

src/util.js

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 export const MASK=0xffffffff;
 export function zeroPad(arr,length){
 	return arr.concat((new Array(length)).fill(0)).slice(0,length);
+}
 export function bytes2int32(arr){
 	return arr.reduce((acc,b,i)=>acc|b<<(i*8));
+}
 export function bytes2int32s(arr){
 	let res=[];
 	for(let i=0;i<arr.length;i+=4){
 		res.push(bytes2int32(arr.slice(i,i+4)));
+	}
 	return res;
+}

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