<!DOCTYPE html>
<style>
img {
display: none
}
</style>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<label for=sec1>sec1 pubkey or directory entry: </label><input onchange=paypossible() placeholder="02ab83cc.../adrian" id=sec1>
<label for=amount>amount: </label><input onchange=paypossible() type=number min=0 max=4294967296 id=amount>
<br><label for=comment>comment:</label>
<br><textarea maxlength=256 style=width:100%;height:3cm placeholder="2023-06-18 21:06:40
kava v motorinu" id=comment></textarea>
<button onclick=paynow() disabled id=pay>pay</button>
<br><label for=directory>directory:</label>
<br><textarea id=directory style=width:100%;height:3cm placeholder="02ab82cd... anton
0384cc98... adrian
03ccdd99... oliver" onchange=savedir()></textarea>
<br><label for=computer>computer:</label> <input onchange=comp() id=computer placeholder="https://denar.sijanec.eu/api.php?m=" />
<button onclick=upload_transactions()>upload transactions</button>
<button onclick=localStorage.removeItem("last_sync_hash")>remove last sync hash</button>
<div id=log></div>
<label for=jwk>private jwk:</label>
<input onchange=login() placeholder='{"alg":"ES384","crv":"P-384","d":"' id=jwk />
<a href=gen.html>gen.html</a>
<br>my pubkey: <span id=sec1me></span>
<div id=reader style=width:100% ><button onclick=cam() >open camera</button></div>
<input type=checkbox id=allbal onchange=chkbox() checked disabled /><label for=allbal>show all <span id=balcnt></span> balances</label>
<div id=balances></div>
<input type=checkbox id=alltx onchange=chkbox() checked disabled /><label for=alltx>show all <span id=txscnt></span> txs</label>
<div id=txs></div>
<script>
async function try_import_tx (a) {
if (a.length != tx_len)
return false;
let tx = await parse_tx(a);
if (!tx)
return false;
if (!localStorage.getItem("transactions")) {
localStorage.setItem("transactions", a2hex(a));
return true;
}
let transactions = hex2a(localStorage.getItem("transactions"));
for (let j = 0; j < transactions.length/tx_len; j++) {
let oldtx = await parse_tx(transactions.slice(tx_len*j, tx_len*j+tx_len));
if (a2hex(oldtx.hash) == a2hex(tx.hash))
return false;
}
let new_transactions = new Uint8Array(transactions.length + tx_len);
new_transactions.set(transactions);
new_transactions.set(a, transactions.length);
transactions = new_transactions;
localStorage.setItem("transactions", a2hex(transactions));
return true;
}
function onscanfail (error) {
return;
}
function onscan (text, result) {
if (typeof(text) == "string" && text.startsWith("U")) {
text = text.slice(-x.length+1);
let a = new Uint8Array(text.length);
for (let i = 0; i < text.length; i++)
a[i] = text.charCodeAt(i)-32;
return onscan(a, result);
}
if (typeof(text) == "string" && text.startsWith("base64:")) // XXX untested
return onscan(Uint8Array.from(atob(text.split(":")[1]), c => c.charCodeAt(0)), result);
if (typeof(text) == "string" && text.startsWith('{') && text.includes("ES384") && text.includes("sign")) {
jwk.value = text;
localStorage.setItem("jwk", jwk.value);
return;
}
let a = new Uint8Array(text.length);
window.scanned = text;
for (let i = 0; i < text.length; i++)
a[i] = text.charCodeAt(i);
console.log("onscan: " + a2hex(a));
if (a[0] == 0) {
alert("standard private key qr codes are unsupported, use a jwk privkey qr code");
return;
}
if (a[0] == 1) {
let p = new Uint8Array(49);
for (let i = 0; i < 49; i++)
p[i] = a[1+i];
let t = new Uint8Array(a.length-50);
for (let i = 0; i < a.length-50; i++)
t[i] = a[50+i];
directory.value += a2hex(p) + " " + new TextDecoder().decode(t).split("\n")[0];
return;
}
if (a[0] == 2) {
let t = new Uint8Array(tx_len);
for (let i = 0; i < tx_len; i++)
t[i] = a[1+i];
if (!parse_tx(t)) {
alert("transaction couldn't be parsed or signature check failed");
return;
}
try_import_tx(t);
return;
}
if (a[0] == 3) {
let r = new Uint8Array(49);
for (let i = 0; i < 49; i++)
r[i] = a[1+i];
sec1.value = a2hex(p);
amount.value = a[49+1]*256*256*256 + a[49+2]*256*256 + a[49+3]*256 + a[49+4];
let t = new Uint8Array(a.length-54);
for (let i = 0; i < a.length-54; i++)
t[i] = a[54+i];
comment.value = new TextDecoder().decode(t);
return;
}
}
function cam () {
let qr = new Html5QrcodeScanner("reader", {fps: 10, qrbox: {width: 350, height: 350}}, false);
qr.render(onscan, onscanfail);
}
const hexchars = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f"];
function a2hex (a) {
let r = "";
for (let i = 0; i < a.length; i++) {
r += hexchars[a[i] >> 4];
r += hexchars[a[i] % 16];
}
return r;
}
function singlehex (h) {
h = h.toLowerCase();
if (!hexchars.includes(h))
return null;
if (h.charCodeAt(0) >= "a".charCodeAt(0))
return 10 + h.charCodeAt(0) - "a".charCodeAt(0);
return h.charCodeAt(0) - "0".charCodeAt(0);
}
function hex2a (s) {
if (!s)
return null;
for (let i = 0; i < s.length; i++)
if (singlehex(s[i]) === null) {
return null;
}
let a = new Uint8Array(s.length/2);
for (let i = 0; i < s.length/2; i++)
a[i] = singlehex(s[2*i])*16 + singlehex(s[2*i+1]);
return a;
}
function xytosec1 (x, y) {
let r = new Uint8Array(49);
if (y[47] % 2)
r[0] = 3;
else
r[1] = 2;
for (let i = 0; i < 48; i++)
r[1+i] = x[i];
return r;
}
function sec1s_get (k) {
return hex2a(localStorage.getItem("sec1s_" + k));
}
function sec1s_set (k, v) {
console.log("sec1s_set: " + k);
if (k.slice(2, 2+48*2) == a2hex(v).slice(2, 2+48*2))
return localStorage.setItem("sec1s_" + k, a2hex(v));
}
var sec1s = {}; /// storage for Y derived from X by server
function pubkey_from_sec1uncompressed (a) {
if (a.length != 48*2+1)
return null;
return crypto.subtle.importKey("raw", a, {name: "ECDSA", namedCurve: "P-384"}, true, ["verify"]);
}
async function pubkey_from_sec1 (a) {
if (!a)
return null;
if (a[0] == 4)
return await pubkey_from_sec1uncompressed(a);
if (sec1s_get(a2hex(a)))
return await pubkey_from_sec1uncompressed(sec1s_get(a2hex(a)));
sec1s_set(a2hex(a), new Uint8Array(await (await fetch(computer.value + "sec1decompress", {method: "POST", body: a})).arrayBuffer()));
return await pubkey_from_sec1uncompressed(sec1s_get(a2hex(a)));
}
const tx_len = 49*2+4+256+32+48*2;
async function parse_tx (a /* uint8array */) { // also verifies
if (a.length < 49*2+4+256+32+48*2)
return null;
let r = {sender: null, recipient: null, amount: null, comment: null, nonce: null, r: null, s: null, hash: null, commentstr: null, senderkey: null, raw: a};
r.sender = a.slice(0, 49);
r.recipient = a.slice(49, 49+49);
r.amount = a[49*2]*256*256*256 + a[49*2+1]*256*256 + a[49*2+2]*256 + a[49*2+3];
r.comment = a.slice(49*2+4, 49*2+4+256);
r.nonce = a.slice(49*2+4+256, 49*2+4+256+32);
r.r = a.slice(49*2+4+256+32, 49*2+4+256+32+48);
r.s = a.slice(49*2+4+256+32+48);
r.commentstr = new TextDecoder().decode(r.comment);
r.senderkey = await pubkey_from_sec1(r.sender);
r.hash = new Uint8Array(await crypto.subtle.digest("SHA-256", a));
if (await crypto.subtle.verify({name: "ECDSA", hash: "SHA-384"}, r.senderkey, a.slice(-48*2), a.slice(0, tx_len-48*2)))
return r;
return false;
}
function upload_transactions () {
return fetch(computer.value + "transactions", {method: "POST", body: hex2a(localStorage.getItem("transactions"))});
/* let local_txs = hex2a(localStorage.getItem("transactions"));
let server_txs = await (await fetch(computer.value + "transactions")).arrayBuffer();
if (server_txs.length % tx_len) {
log.innerText += "server transactions response length modulo tx_len isn't zero!";
return;
}
let localtxs = [];
for (let i = 0; i < local_txs.length/tx_len; i++)
localtxs.push(local_txs.slice(tx_len*i, tx_len*i+tx_len));
for (let i = 0; i < server_txs.length/tx_len; i++) {
let remote_tx = local_txs.slice(tx_len*i, tx_len*i+tx_len);
while (localtxs.indexOf(remote_tx) !== -1)
localtxs.splice(localtxs.indexOf(remote_tx), 1);
}
localtxs.forEach(tx => {
fetch(computer.value + "transaction", {method: "POST", body: tx});
}); */
}
async function sync_transactions () {
let transactions = hex2a(localStorage.getItem("transactions"));
if (!transactions)
transactions = new Uint8Array(0);
let server_transactions = new Uint8Array(await (await fetch(computer.value + "transactions", {headers: {"After": localStorage.getItem("last_sync_hash")}})).arrayBuffer());
if (server_transactions.length % tx_len)
return;
let count = 0;
aLoop:
for (let i = 0; i < server_transactions.length/tx_len; i++)
if (await try_import_tx(server_transactions.slice(tx_len*i, tx_len*i+tx_len)))
count++;
if (server_transactions.length)
localStorage.setItem("last_sync_hash", a2hex(new Uint8Array(await crypto.subtle.digest("SHA-256", server_transactions.slice(-tx_len)))));
if (count)
rendertxsbal();
return count;
}
async function paynow () {
let sender = await sec1_from_pubkey(await pubkey_from_string("me"));
let rcpt = await sec1_from_pubkey(window.recipient);
let amount32 = new Uint8Array(4);
amount32[3] = amount.value % 256;
amount32[2] = (amount.value >> 8) % 256;
amount32[1] = (amount.value >> 16) % 256;
amount32[0] = (amount.value >> 24) % 256;
amount.value = "";
let comm = new TextEncoder().encode(comment.value);
let comm256 = new Uint8Array(256);
comm256[255] = 69; // user agent (nonstandard ofc)
for (let i = 0; i < 256; i++)
comm256[i] = comm[i];
nonce = crypto.getRandomValues(new Uint8Array(32));
let tx_unsigned = new Uint8Array(tx_len-2*48);
tx_unsigned.set(sender);
tx_unsigned.set(rcpt, sender.length);
tx_unsigned.set(amount32, sender.length+rcpt.length);
tx_unsigned.set(comm256, sender.length+rcpt.length+amount32.length);
tx_unsigned.set(nonce, sender.length+rcpt.length+amount32.length+comm256.length);
let signature = new Uint8Array(await crypto.subtle.sign({name: "ECDSA", hash: "SHA-384"}, key, tx_unsigned));
let tx_signed = new Uint8Array(tx_unsigned.length+signature.length);
tx_signed.set(tx_unsigned);
tx_signed.set(signature, tx_unsigned.length);
let transactions = hex2a(localStorage.getItem("transactions"));
let new_transactions = new Uint8Array((transactions ? transactions.length : 0) + tx_signed.length);
if (transactions)
new_transactions.set(transactions);
new_transactions.set(tx_signed, transactions ? transactions.length : 0);
localStorage.setItem("transactions", a2hex(new_transactions));
rendertxsbal();
upload_transactions();
}
function comp () {
if (!computer.value)
return;
if (localStorage.getItem("computer") != computer.value) {
localStorage.setItem("computer", computer.value);
localStorage.removeItem("last_sync_hash");
sync_transactions();
}
paypossible();
}
function sec1_compress (k) {
let r = new Uint8Array(49);
r[0] = 2;
if (k[48*2] % 2)
r[0] = 3;
for (let i = 0; i < 48; i++)
r[1+i] = k[1+i];
return r;
}
async function sec1_from_pubkey (k) {
return sec1_compress(new Uint8Array(await crypto.subtle.exportKey("raw", k)));
}
async function pubkey_from_string (s) {
if (s == "me")
return await pubkey_from_sec1(hex2a(sec1me.innerText));
if (await pubkey_from_sec1(hex2a(s))) {
return await pubkey_from_sec1(hex2a(s));
}
let d = directory.value.split("\n");
for (let i = 0; i < d.length; i++) {
if (d[i].includes(s)) {
return await pubkey_from_sec1(hex2a(d[i].split(" ")[0]));
}
}
return false;
}
async function paypossible () {
if (amount.value == "") {
console.log("paypossible: empty amount field");
pay.disabled = true;
return;
}
if (!(Number(amount.value) <= 4294967296 && Number(amount.value) >= 0)) {
console.log("paypossible: amount invalid");
pay.disabled = true;
return;
}
if (!key.usages.includes("sign")) {
console.log("paypossible: bad privkey");
pay.disabled = true;
return;
}
window.recipient = await pubkey_from_string(sec1.value);
if (recipient == false) {
console.log("paypossible: recipient pubkey bad");
pay.disabled = true;
return;
}
pay.disabled = false;
}
function resolvepubkey (a) {
if (a2hex(a) == sec1me.innerText)
return "me";
let d = directory.value.split("\n");
for (let i = 0; i < d.length; i++)
if (d[i].includes(a2hex(a).slice(-48*2)))
return d[i].split(" ").slice(1).join(" ");
return a2hex(a);
}
function draw_canvas (qr, scale, border, light, dark, canvas) {
canvas.width = canvas.height = (qr.size + border * 2) * scale;
let ctx = canvas.getContext("2d");
for (let y = -border; y < qr.size + border; y++) {
for (let x = -border; x < qr.size + border; x++) {
ctx.fillStyle = qr.getModule(x, y) ? dark : light;
ctx.fillRect((x + border) * scale, (y + border) * scale, scale, scale);
}
}
}
function txqr (seq, h) {
let a = hex2a(h);
let d = new Uint8Array(a.length+1);
d.set(a, 1)
d[0] = 2;
// draw_canvas(qrcodegen.QrCode.encodeBinary(d, qrcodegen.QrCode.Ecc.LOW), 5, 4, "#FFF", "#000", document.getElementById("cnv" + seq));
let s = "U";
for (let i = 0; i < d.length; i++)
s += String.fromCharCode(32+d[i]);
draw_canvas(qrcodegen.QrCode.encodeText(s, qrcodegen.QrCode.Ecc.LOW), 5, 4, "#FFF", "#000", document.getElementById("cnv" + seq));
document.getElementById("cnv" + seq).hidden = false;
document.getElementById("btn" + seq).hidden = true;
document.getElementById("br" + seq).hidden = false;
}
async function rendertxsbal () {
let transactions = hex2a(localStorage.getItem("transactions") ?? "");
if (!transactions) {
txs.innerHTML = "no transactions";
balances.innerHTML = "no transactions";
return;
}
let trans = [];
let balan = {};
for (let j = 0; j < transactions.length/tx_len; j++) {
let tx = await parse_tx(transactions.slice(tx_len*j, tx_len*j+tx_len));
trans.push(tx);
if (!Object.keys(balan).includes(resolvepubkey(tx.sender)))
balan[resolvepubkey(tx.sender)] = 0;
if (!Object.keys(balan).includes(resolvepubkey(tx.recipient)))
balan[resolvepubkey(tx.recipient)] = 0;
balan[resolvepubkey(tx.recipient)] += tx.amount;
balan[resolvepubkey(tx.sender)] -= tx.amount;
}
txscnt.innerText = trans.length;
txs.innerHTML = "";
let tx = null;
let seq = 0;
while (tx = trans.pop())
if (alltx.checked || resolvepubkey(tx.sender) == "me" || resolvepubkey(tx.recipient) == "me") {
txs.innerHTML += "<hr><canvas hidden='' id=cnv" + seq + "></canvas> <button id=btn" + seq + " onclick=txqr(" + seq + ",'" + a2hex(tx.raw) + "')>qr</button><br id=br" + seq + " hidden>sender: " + resolvepubkey(tx.sender) + "<br>recipient: " + resolvepubkey(tx.recipient) + "<br>amount: " + tx.amount + "<br>comment: " + tx.commentstr.replace("<", "<");
seq++;
}
balances.innerHTML = "";
Object.keys(balan).forEach(c => {
if (allbal.checked || c == "me")
balances.innerHTML += c + ": " + balan[c] + "<br>"
});
balcnt.innerText = Object.keys(balan).length;
}
async function chkbox () {
if (allbal.checked)
localStorage.setItem("allbal", "true");
else
localStorage.setItem("allbal", "false");
if (alltx.checked)
localStorage.setItem("alltx", "true");
else
localStorage.setItem("alltx", "false");
rendertxsbal();
}
async function login () {
localStorage.setItem("jwk", jwk.value);
window.key = await crypto.subtle.importKey("jwk", JSON.parse(jwk.value), {name: "ECDSA", namedCurve: "P-384"}, true, ["sign"]);
if (key.usages.includes("sign")) {
allbal.disabled = false;
alltx.disabled = false;
if (localStorage.getItem("alltx") == "true")
alltx.checked = true;
else
alltx.checked = false;
if (localStorage.getItem("allbal") == "true")
allbal.checked = true;
else
allbal.checked = false;
chkbox();
let mysec1 = new Uint8Array(49);
if (Uint8Array.from(atob(JSON.parse(jwk.value).y.replace(/-/g, "+").replace(/_/g, "/")), c => c.charCodeAt(0))[47] % 2)
mysec1[0] = 3;
else
mysec1[0] = 2;
for (let i = 0; i < 48; i++)
mysec1[1+i] = Uint8Array.from(atob(JSON.parse(jwk.value).x.replace(/-/g, "+").replace(/_/g, "/")), c => c.charCodeAt(0))[i];
sec1me.innerText = a2hex(mysec1);
} else {
console.log("login: privkey not ok");
sec1me.innerText = "";
allbal.disabled = true;
allbal.checked = true;
alltx.checked = true;
alltx.disabled = true;
}
paypossible();
}
function savedir () {
localStorage.setItem("directory", directory.value);
}
async function main () {
directory.value = localStorage.getItem("directory");
computer.value = localStorage.getItem("computer");
jwk.value = localStorage.getItem("jwk");
if (jwk.value != "")
await login();
await comp();
let push = false;
while (true) {
sync_transactions();
if (location.protocol == "file:" || !push)
await new Promise(r => setTimeout(r, 2000));
else {
let resp = await fetch(computer.value + "push", {method: "POST", body: hex2a(localStorage.getItem("last_sync_hash"))})
if (!resp.ok)
await new Promise(r => setTimeout(r, 2000));
}
}
rendertxsbal();
}
main();
</script>
<script src=QR-Code-generator/typescript-javascript/qrcodegen.js></script>
<script src=node_modules/html5-qrcode/html5-qrcode.min.js></script>
