33 lines
969 B
JavaScript
33 lines
969 B
JavaScript
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self.onmessage = async (e) => {
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const { nonce, difficulty } = e.data
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const ENCODER = new TextEncoder()
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const BATCH = 1000
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let counter = 0
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while (true) {
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const batch = await Promise.all(
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Array.from({ length: BATCH }, (_, i) => {
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const data = ENCODER.encode(nonce + (counter + i))
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return crypto.subtle.digest('SHA-256', data)
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}),
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)
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for (let i = 0; i < BATCH; i++) {
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const hash = new Uint8Array(batch[i])
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let zeroBits = 0
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for (const byte of hash) {
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if (byte === 0) {
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zeroBits += 8
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} else {
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zeroBits += Math.clz32(byte) - 24
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break
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}
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}
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if (zeroBits >= difficulty) {
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self.postMessage({ counter: counter + i })
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return
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}
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}
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counter += BATCH
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}
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}
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