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Moves derivation math out into the open

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Daniel Cousens 2014-04-17 06:45:57 +10:00
parent bacf7e7ae2
commit ddea4b176b
1 changed files with 13 additions and 7 deletions
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20
src/hdwallet.js
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@ -10,6 +10,9 @@ var ECKey = require('./eckey').ECKey
var ECPubKey = require('./eckey').ECPubKey var ECPubKey = require('./eckey').ECPubKey
var Network = require('./network') var Network = require('./network')
var sec = require('./jsbn/sec')
var ecparams = sec("secp256k1")
function HmacSHA512(buffer, secret) { function HmacSHA512(buffer, secret) {
var words = convert.bytesToWordArray(buffer) var words = convert.bytesToWordArray(buffer)
var hash = CJS.HmacSHA512(words, secret) var hash = CJS.HmacSHA512(words, secret)
@ -204,26 +207,29 @@ HDWallet.prototype.derive = function(i) {
I = new Buffer(I) I = new Buffer(I)
// Split I = IL || IR into two 32-byte sequences, IL and IR. // Split I = IL || IR into two 32-byte sequences, IL and IR.
var IL = I.slice(0, 32) var ILb = I.slice(0, 32)
, IR = I.slice(32) , IRb = I.slice(32)
var hd = new HDWallet() var hd = new HDWallet()
hd.network = this.network hd.network = this.network
var ILbytes = Buffer.concat([IL, new Buffer([0x01])]) var IL = BigInteger.fromByteArrayUnsigned(ILb)
var ILpriv = new ECKey(ILbytes, true)
if (this.priv) { if (this.priv) {
// ki = IL + kpar (mod n). // ki = IL + kpar (mod n).
hd.priv = this.priv.add(ILpriv) var ki = IL.add(this.priv.priv).mod(ecparams.getN())
hd.priv = new ECKey(ki, true)
hd.pub = hd.priv.getPub() hd.pub = hd.priv.getPub()
} else { } else {
// Ki = (IL + kpar)*G = IL*G + Kpar // Ki = (IL + kpar)*G = IL*G + Kpar
hd.pub = this.pub.add(ILpriv.getPub()) var Ki = IL.multiply(ecparams.getG()).add(this.pub.pub)
hd.pub = new ECPubKey(Ki, true)
} }
// ci = IR. // ci = IR.
hd.chaincode = IR hd.chaincode = IRb
hd.parentFingerprint = this.getFingerprint().readUInt32BE(0) hd.parentFingerprint = this.getFingerprint().readUInt32BE(0)
hd.depth = this.depth + 1 hd.depth = this.depth + 1
hd.index = i hd.index = i