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HDWallet: extract BIP32 params search function

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This commit is contained in:
Daniel Cousens 2014-05-31 20:22:32 +10:00
parent 759aeb9abc
commit 708e27aa2d
1 changed files with 21 additions and 17 deletions
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38
src/hdwallet.js
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@ -11,6 +11,23 @@ var networks = require('./networks')
var sec = require('./sec')
var ecparams = sec("secp256k1")
function findBIP32ParamsByVersion(version) {
for (var name in networks) {
var network = networks[name]
for (var type in network.bip32) {
if (version != network.bip32[type]) continue
return {
isPrivate: (type === 'priv'),
network: network
}
}
}
assert(false, 'Could not find version ' + version.toString(16))
}
function HDWallet(K, chainCode, network) {
network = network || networks.bitcoin
@ -67,20 +84,7 @@ HDWallet.fromBuffer = function(buffer) {
// 4 byte: version bytes
var version = buffer.readUInt32BE(0)
var hdNetwork, isPrivate
for (var name in networks) {
var network = networks[name]
for (var type in network.bip32) {
if (version != network.bip32[type]) continue
hdNetwork = network
isPrivate = (type === 'priv')
}
}
assert(hdNetwork, 'Could not find version ' + version.toString(16))
var params = findBIP32ParamsByVersion(version)
// 1 byte: depth: 0x00 for master nodes, 0x01 for level-1 descendants, ...
var depth = buffer.readUInt8(4)
@ -104,18 +108,18 @@ HDWallet.fromBuffer = function(buffer) {
var data = buffer.slice(45, 78)
var hd
if (isPrivate) {
if (params.isPrivate) {
assert.strictEqual(data.readUInt8(0), 0x00, 'Invalid private key')
data = data.slice(1)
var D = BigInteger.fromBuffer(data)
hd = new HDWallet(D, chainCode, hdNetwork)
hd = new HDWallet(D, chainCode, params.network)
} else {
var decode = ECPointFp.decodeFrom(ecparams.getCurve(), data)
assert.equal(decode.compressed, true, 'Invalid public key')
hd = new HDWallet(decode.Q, chainCode, hdNetwork)
hd = new HDWallet(decode.Q, chainCode, params.network)
}
hd.depth = depth