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Adding function to decide if HDNode is public

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Public === neutered. Private === not neutered
This commit is contained in:
Karel Bílek 2016-02-05 04:43:56 +01:00 • committed by Karel Bilek
parent 61d08fab94
commit fbcb478560
1 changed files with 10 additions and 4 deletions

14
src/hdnode.js
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@ -170,7 +170,7 @@ HDNode.prototype.toBase58 = function (__isPrivate) {
// Version // Version
var network = this.keyPair.network var network = this.keyPair.network
var version = this.keyPair.d ? network.bip32.private : network.bip32.public var version = (!this.isNeutered()) ? network.bip32.private : network.bip32.public
var buffer = new Buffer(78) var buffer = new Buffer(78)
// 4 bytes: version bytes // 4 bytes: version bytes
@ -190,7 +190,7 @@ HDNode.prototype.toBase58 = function (__isPrivate) {
this.chainCode.copy(buffer, 13) this.chainCode.copy(buffer, 13)
// 33 bytes: the public key or private key data // 33 bytes: the public key or private key data
if (this.keyPair.d) { if (!this.isNeutered()) {
// 0x00 + k for private keys // 0x00 + k for private keys
buffer.writeUInt8(0, 45) buffer.writeUInt8(0, 45)
this.keyPair.d.toBuffer(32).copy(buffer, 46) this.keyPair.d.toBuffer(32).copy(buffer, 46)
@ -211,7 +211,7 @@ HDNode.prototype.derive = function (index) {
// Hardened child // Hardened child
if (isHardened) { if (isHardened) {
if (!this.keyPair.d) throw new TypeError('Could not derive hardened child key') if (this.isNeutered()) throw new TypeError('Could not derive hardened child key')
// data = 0x00 || ser256(kpar) || ser32(index) // data = 0x00 || ser256(kpar) || ser32(index)
data[0] = 0x00 data[0] = 0x00
@ -239,7 +239,7 @@ HDNode.prototype.derive = function (index) {
// Private parent key -> private child key // Private parent key -> private child key
var derivedKeyPair var derivedKeyPair
if (this.keyPair.d) { if (!this.isNeutered()) {
// ki = parse256(IL) + kpar (mod n) // ki = parse256(IL) + kpar (mod n)
var ki = pIL.add(this.keyPair.d).mod(curve.n) var ki = pIL.add(this.keyPair.d).mod(curve.n)
@ -281,6 +281,12 @@ HDNode.prototype.deriveHardened = function (index) {
return this.derive(index + HDNode.HIGHEST_BIT) return this.derive(index + HDNode.HIGHEST_BIT)
} }
// Private === not neutered
// Public === neutered
HDNode.prototype.isNeutered = function () {
return !(this.keyPair.d)
}
HDNode.prototype.toString = HDNode.prototype.toBase58 HDNode.prototype.toString = HDNode.prototype.toBase58
module.exports = HDNode module.exports = HDNode