33 lines
1 KiB
JavaScript
33 lines
1 KiB
JavaScript
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const generateButton = document.getElementById("generate-pow");
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generateButton.style.display = "block";
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const usernameField = document.getElementById("username");
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const messageField = document.getElementById("message");
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const powField = document.getElementById("proof-of-work");
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const hash = (message) =>
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crypto.subtle.digest("SHA-1",
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(new TextEncoder()).encode(message)
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);
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const isValidHash = (hashBuffer) =>
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Array.from(new Uint8Array(hashBuffer))
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.map(byte => byte.toString(16).padStart(2, "0"))
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.join("").startsWith("00000");
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const messageBase = () => usernameField.value + "\0" + messageField.value + "\0";
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generateButton.onclick = async (event) => {
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event.preventDefault();
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const base = messageBase();
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let currentNonce = 0;
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powField.disabled = true;
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powField.value = "Generating... Please wait";
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console.log("Starting PoW generation, this may take a while....");
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while (!isValidHash(await hash(base + currentNonce)))
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++currentNonce;
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console.log("Done!");
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powField.value = currentNonce;
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powField.disabled = false;
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};
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