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rpaskin/hashing3.html

Created June 6, 2019 17:39
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We can use the following code on Opera Android to get a file, hash it, then sign the hash with the local Ethereum Account
Raw
hashing3.html
<!DOCTYPE html>
<html>
<head>
<title>Test Opera</title>
<script src="//cdn.jsdelivr.net/gh/ethereum/[email protected]/dist/web3.min.js" type="text/javascript"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/js-sha3/0.8.0/sha3.min.js" type="text/javascript"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/zepto/1.2.0/zepto.min.js" type="text/javascript" charset="utf-8"></script>
<script type="text/javascript">
const web3 = new Web3(ethereum);
const storage = window.localStorage;
var myAccount;
</script>
</head>
<body>
<form action="submit" method="get" accept-charset="utf-8" onsubmit="return false;">
<input type="text" id="myAccount" name="myAccount" value="" placeholder="myAccount">
<input type="text" id="signed" name="signed" value="" placeholder="signed package">
<input type="file" onchange="hashFile(this)" id="my_document" multipe=false class="inputfile">
</form>
<script type="text/javascript">
$( document ).ready(function() {
web3.eth.getAccounts().then((accounts) => { myAccount = accounts[0]; $("#myAccount").val(myAccount); });
});
function hashFile(el) {
var fr = new FileReader();
fr.onload = function (ev) {
var data = ev.srcElement.result;
web3.eth.personal.sign(keccak256(data), myAccount, (err, signed) => {
console.log(31, err, signed);
$("#signed").val(signed);
});
};
fr.readAsArrayBuffer(el.files[0]);
}
</script>
</body>
</html>
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