mirror of https://github.com/BTCPrivate/copay.git
54 lines
1.5 KiB
JavaScript
54 lines
1.5 KiB
JavaScript
'use strict';
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var preconditions = require('preconditions').singleton();
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function HDPath() {}
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/*
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* Based on https://github.com/maraoz/bips/blob/master/bip-NNNN.mediawiki
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* m / purpose' / copayerIndex / change / addressIndex
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*/
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var PURPOSE = 45;
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var MAX_NON_HARDENED = 0x80000000 - 1;
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var SHARED_INDEX = MAX_NON_HARDENED - 0;
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var ID_INDEX = MAX_NON_HARDENED - 1;
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var BIP45_PUBLIC_PREFIX = 'm/' + PURPOSE + '\'';
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HDPath.BIP45_PUBLIC_PREFIX = BIP45_PUBLIC_PREFIX;
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HDPath.Branch = function(addressIndex, isChange, copayerIndex) {
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preconditions.shouldBeNumber(addressIndex);
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preconditions.shouldBeBoolean(isChange);
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var ret = 'm/' +
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(typeof copayerIndex !== 'undefined' ? copayerIndex : SHARED_INDEX) + '/' +
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(isChange ? 1 : 0) + '/' +
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addressIndex;
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return ret;
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};
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HDPath.FullBranch = function(addressIndex, isChange, copayerIndex) {
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var sub = HDPath.Branch(addressIndex, isChange, copayerIndex);
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sub = sub.substring(2);
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return BIP45_PUBLIC_PREFIX + '/' + sub;
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};
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HDPath.indexesForPath = function(path) {
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preconditions.shouldBeString(path);
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var s = path.split('/');
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return {
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isChange: s[3] === '1',
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addressIndex: parseInt(s[4]),
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copayerIndex: parseInt(s[2])
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};
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};
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HDPath.IdFullBranch = HDPath.FullBranch(0, false, ID_INDEX);
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HDPath.IdBranch = HDPath.Branch(0, false, ID_INDEX);
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HDPath.PURPOSE = PURPOSE;
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HDPath.MAX_NON_HARDENED = MAX_NON_HARDENED;
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HDPath.SHARED_INDEX = SHARED_INDEX;
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HDPath.ID_INDEX = ID_INDEX;
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module.exports = HDPath;
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