79 lines
2.0 KiB
JavaScript
79 lines
2.0 KiB
JavaScript
/**
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* Node.js implementation of platform-specific routines.
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*/
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"use strict";
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var os = require("os");
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var crypto = require("crypto");
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var promise = typeof Promise === "undefined" ?
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require("es6-promise").Promise :
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Promise;
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var bignum = require("bignum");
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var assert = require("./_util").assert;
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var worker = require("./worker");
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var createHash = crypto.createHash;
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exports.sha1 = function(buf) {
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return createHash("sha1").update(buf).digest();
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};
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exports.sha256 = function(buf) {
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return createHash("sha256").update(buf).digest();
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};
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exports.sha512 = function(buf) {
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return createHash("sha512").update(buf).digest();
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};
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exports.ripemd160 = function(buf) {
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return createHash("ripemd160").update(buf).digest();
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};
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exports.randomBytes = crypto.randomBytes;
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// 2^80.
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var B80 = bignum("1208925819614629174706176");
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// NOTE(Kagami): We can't calculate entire target in JavaScript but the
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// result can be represented in native number type without losing
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// precision (targets mainly much less than 2^53).
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exports.getTarget = function(opts) {
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// Slightly rearrange calculations and compute it bottom-up,
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// right-to-left. See also:
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// <https://github.com/Bitmessage/PyBitmessage/issues/758>.
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var length = bignum(opts.payloadLength)
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// To account for the nonce which we will append later.
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.add(8)
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.add(opts.payloadLengthExtraBytes);
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var denominator = bignum(opts.ttl)
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.add(65536)
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.mul(length)
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.mul(opts.nonceTrialsPerByte);
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var target = B80.div(denominator).toNumber();
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assert(target <= 9007199254740991, "Unsafe target");
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return target;
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};
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exports.pow = function(opts) {
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var poolSize = opts.poolSize || os.cpus().length;
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// TODO(Kagami): Allow to cancel a POW (see `platform.browser.js`).
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return new promise(function(resolve, reject) {
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worker.powAsync(
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poolSize,
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opts.target,
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opts.initialHash,
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function(err, nonce) {
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if (err) {
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reject(err);
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} else {
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resolve(nonce);
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}
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}
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);
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});
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};
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exports.promise = promise;
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