54 lines
1.2 KiB
JavaScript
54 lines
1.2 KiB
JavaScript
/**
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* Web Worker routines for Browser platform.
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*/
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"use strict";
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var Sha512 = require("sha.js/sha512");
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function sha512(buf) {
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return new Sha512().update(buf).digest();
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}
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function pow(opts) {
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var nonce = opts.num;
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var poolSize = opts.poolSize;
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var message = Buffer.alloc(72);
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message.fill(0);
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Buffer(opts.initialHash).copy(message, 8);
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var targetHi = Math.floor(opts.target / 4294967296);
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var targetLo = opts.target % 4294967296;
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var digest, trialHi, trialLo;
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while (true) {
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// uint32_t overflow. There is no much need to fix it since 4G
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// double hashes would we computed too long anyway in a Browser.
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if (nonce > 4294967295) {
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return -1;
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}
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message.writeUInt32BE(nonce, 4, true);
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digest = sha512(sha512(message));
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trialHi = digest.readUInt32BE(0, true);
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if (trialHi > targetHi) {
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nonce += poolSize;
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} else if (trialHi === targetHi) {
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trialLo = digest.readUInt32BE(4, true);
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if (trialLo > targetLo) {
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nonce += poolSize;
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} else {
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return nonce;
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}
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} else {
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return nonce;
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}
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}
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}
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module.exports = function(self) {
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self.onmessage = function(e) {
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self.postMessage(pow(e.data));
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};
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};
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