function testBlake(){

	let msg=str2utf8("abc");

	let longMsg=str2utf8("0123456789.10.456789.20.456789.30.456789.40.456789.50.456789.60.456789.70.456789.80.456789.90.456789");

	let key=str2utf8("zoqpiz");

	let longKey=str2utf8("zoqpizjutyclcmkamzhhmhvchxjtefjy");

	console.log(bytes2hex(blake2s(msg,16))=="aa4938119b1dc7b87cbad0ffd200d0ae");

	console.log(bytes2hex(blake2s(msg,20))=="5ae3b99be29b01834c3b508521ede60438f8de17");

	console.log(bytes2hex(blake2s(msg,28))=="0b033fc226df7abde29f67a05d3dc62cf271ef3dfea4d387407fbd55");

	console.log(bytes2hex(blake2s(msg))=="508c5e8c327c14e2e1a72ba34eeb452f37458b209ed63a294d999b4c86675982");

	console.log(bytes2hex(blake2s(longMsg))=="59a44e5e417d07fb382505ee7e67c23e0d476d354abc81899960bcab677beee1");

	console.log(bytes2hex(blake2s(msg,32,key))=="0da0b6a54e8f294b60bb25c572700166ddb9d124257ff36f9f43f18b844adf9f");

	console.log(bytes2hex(blake2s(msg,32,longKey))=="09ef85c9942bebdeb866c6ade769220fd9b851aead642017f6d59bf7e2a32037");

	console.log(bytes2hex(blake2s([]))=="69217a3079908094e11121d042354a7c1f55b6482ca1a51e1b250dfd1ed0eef9");

	console.log(bytes2hex(blake2s(longMsg.slice(0,64)))=="70484f89974551454d596350dda8af2aa6f0811b527549b9ecfe7adede063753");

	console.log(bytes2hex(blake2s(longMsg.slice(0,65)))=="af14d4f74947bbde734d0e3015c667cc80676efe4349be235be8046e9e45e0ae");

}

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

function createNonce(){

	let nonce=new Uint8Array(12);

	window.crypto.getRandomValues(nonce);

	return nonce;

}

function Chacha20(key,nonce){

	if(nonce===undefined){

		let nonce=createNonce();

	}

	nonce=bytes2int32s(nonce);

	key=bytes2int32s(key);

	this._state=[

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

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

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

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

	];

	this._buffer=[];

}

Chacha20.prototype.setPos=function(pos){

	this._state[12]=pos;

	this._buffer=[];

}

Chacha20.prototype.getByte=function(){

	if(this._buffer.length==0){

		this._buffer=int32s2bytes(this._computeBlock());

	}

	return this._buffer.shift();

};

Chacha20.prototype._quarterRound=function(arr,ia,ib,ic,id){

	let a=arr[ia], b=arr[ib], c=arr[ic], d=arr[id];

};

Chacha20.prototype._computeBlock=function(){

	let state=this._state.slice();

	for(let i=0;i<10;i++){ // 10 double rounds

		// column round

		this._quarterRound(state,0,4,8,12);

		this._quarterRound(state,1,5,9,13);

		this._quarterRound(state,2,6,10,14);

		this._quarterRound(state,3,7,11,15);

		// diagonal round

		this._quarterRound(state,0,5,10,15);

		this._quarterRound(state,1,6,11,12);

		this._quarterRound(state,2,7,8,13);

		this._quarterRound(state,3,4,9,14);

	}

	return state.map((xi,i)=>(xi+this._state[i])&MASK);

};

Chacha20.prototype._incrementPos=function(){

	this._state[12]=(this._state[12]+1)&MASK;

};

function encrypt(message,key){

	let nonce=Date.now();

	let nonce0=nonce;

	let hashedKey=blake2s(str2bytes(key));

	message=str2bytes(message);

function testChacha(){

	let key=[0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29,30,31];

	let nonce=[0,0,0,9,0,0,0,74,0,0,0,0];

	let cipher=new Chacha20(key,nonce);

	cipher.setPos(1);

	let output=cipher._computeBlock().map(x=>(x>>>0).toString(16).padStart(8,"0"));

	let example=["e4e7f110","15593bd1","1fdd0f50","c47120a3","c7f4d1c7","0368c033","9aaa2204","4e6cd4c3","466482d2","09aa9f07","05d7c214","a2028bd9","d19c12b5","b94e16de","e883d0cb","4e3c50a2"];

	console.log(output.every((x,i)=>x==example[i]));

const MASK=0xffffffff;