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coinflip_new.html
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coinflip_new.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>CoinFLip Verify</title>
<link rel="stylesheet" href="./lib/main.css">
<link rel="stylesheet" href="./lib/bootstrap/css/bootstrap.min.css">
<style>
.round-item {
margin-bottom: 10px;
}
.round-item p {
margin: 4px 0;
}
.round-item .t{
font-weight: bold;
}
.table-wrap {
overflow-x: auto;
}
.round-item h6 {
margin: 0;
margin-bottom: 8px;
}
</style>
<script src="./lib/react.production.min.js"></script>
<script src="./lib/react-dom.production.min.js"></script>
<script src="./lib/crypto-js.js"></script>
<script src="./lib/tools.js"></script>
<script src="./lib/hooks.js"></script>
<script src="./lib/babel.min.js"></script>
<script src="./lib/utils.js"></script>
</head>
<body>
<div id="app"></div>
<script type="text/babel">
let qs = tools.queryString();
let { useEffect, useMemo } = React;
const { useSetState } = hooks;
function useInputControl (initState) {
const [state, setState] = useSetState(initState);
const bind = key => ({
value: state[key],
onChange: v => setState({[key]: v})
});
return [
state,
setState,
bind
];
}
function Input ({value, onChange, ...others}) {
return (
<div class="form-group">
<input value={value}
onChange={e => onChange(e.target.value)}
class="form-control"
{...others}
/>
</div>
);
}
function getHashString (serverSeed, clientSeed, nonce, round) {
const resultArr = [clientSeed, nonce, round];
const hmacSha256Result = String(CryptoJS.HmacSHA256(resultArr.join(":"), serverSeed));
return hmacSha256Result;
}
function getHashResultNumber (hashResult) {
let res = {dec: [], hex: []};
for (let i = 0; i < hashResult.length; i += 2) {
let dext = hashResult[i] + hashResult[i + 1]
let hext = parseInt(dext, 16)
res.dec.push(dext)
res.hex.push(hext)
}
return res;
}
function getResult (hash) {
return Math.floor(slideWindowNumber(hash, 2));
}
function CoinFLip () {
const [state, setState, bind] = useInputControl({
clientSeed: qs.c||'',
serverSeed: qs.s||'',
nonce: parseInt(qs.n)||'',
round: parseInt(qs.r)||10
});
return (
<div className="main">
<h1 className="text-center pb-5">CoinFlip verify</h1>
<hr />
<h2 class="text-center">Input</h2>
<form className="py-5">
<Input placeholder="Server Seed" {...bind('serverSeed')} />
<Input placeholder="Client Seed (Hashed)" {...bind('clientSeed')} />
<Input placeholder="Nonce" {...bind('nonce')} />
<Input placeholder="Rounds" {...bind('round')} />
</form>
<h2 class="text-center">Output</h2>
<form className="py-5">
{
Array(state.round).fill(1).map((item, idx) => {
const hmacSha256Result = getHashString(state.serverSeed, state.clientSeed, state.nonce, idx+1);
const finalResult = getResult(hmacSha256Result);
const baseHash = hmacSha256Result.substring(0, 15);
const index = Number(BigInt('0x' + baseHash) % BigInt(47));
const newHash = hmacSha256Result.substring(index, index + 14);
return (
<div className="round-item" key={"round-" + idx}>
<p className="t">Round: {idx + 1}</p>
<div class="form-group">
<label>Final Result</label>
<input class="form-control" disabled value={finalResult} />
<h5 style={{ marginTop: 20 }}>Calculation Process</h5>
<p>Using the formula `hmac_sha256(client_seed:nonce, server_seed)`,</p>
<p>We get the hash result:</p>
<p>{hmacSha256Result}.</p>
<br />
<ol>
<li>Take the first 15 characters, resulting in {baseHash}.</li>
<li>Convert this to decimal, which gives: {BigInt('0x' + baseHash)}.</li>
<li>Perform modulus 47(47 is fixed constant), and we get a remainder of {index}.</li>
<li>Starting from the index, take 14 characters, resulting in <span className="text-danger">{newHash}</span>.</li>
<li>Convert this to decimal, resulting in: {BigInt('0x' + newHash)}.</li>
<li>Divide by 8(8 is a fixed constant), resulting in: {BigInt('0x' + newHash) / BigInt(8)}.</li>
<li>Multiply by 2^-53(2^-53 is a fixed constant), resulting in: {Number(BigInt('0x' + newHash) / BigInt(8)) * Math.pow(2, -53)}.</li>
<li>Multiply by 2(2 is a fixed constant), resulting in: {Number(BigInt('0x' + newHash) / BigInt(8)) * Math.pow(2, -53) * 2}.</li>
<li>Finally, take the integer part of the result, which gives: <span class="text-success">{finalResult}</span>.</li>
</ol>
</div>
</div>
)
})
}
</form>
</div>
);
}
ReactDOM.render(<CoinFLip />, document.getElementById("app"));
</script>
</body>
</html>