dbaron/sha256.html

## sha256.html
<!DOCTYPE HTML>
<meta charset="UTF-8">
<title>sha256sum</title>
<script>

function buffer_to_hex(buffer)
{
  return Array.from(new Uint8Array(buffer)).map((e) => ("0" + Number(e).toString(16)).slice(-2)).join("");
}

function sha256_string(s)
{
  var bytes = (new TextEncoder("UTF-8")).encode(s);
  return crypto.subtle.digest("SHA-256", bytes).then((hashBuffer) => buffer_to_hex(hashBuffer));
}

sha256_string("hello").then((res) => { console.log("hello hashes to", res); },
                            (e) => { console.log("exception:", e); });

</script>
	<!DOCTYPE HTML>
	<meta charset="UTF-8">
	<title>sha256sum</title>
	<script>

	function buffer_to_hex(buffer)
	{
	return Array.from(new Uint8Array(buffer)).map((e) => ("0" + Number(e).toString(16)).slice(-2)).join("");
	}

	function sha256_string(s)
	{
	var bytes = (new TextEncoder("UTF-8")).encode(s);
	return crypto.subtle.digest("SHA-256", bytes).then((hashBuffer) => buffer_to_hex(hashBuffer));
	}

	sha256_string("hello").then((res) => { console.log("hello hashes to", res); },
	(e) => { console.log("exception:", e); });

	</script>