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stealth: clarify super simply

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This commit is contained in:
Daniel Cousens 2016-12-10 12:34:06 +11:00 committed by Daniel Cousens
parent dec21317e7
commit 1304527c1d
1 changed files with 6 additions and 8 deletions
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14
test/integration/stealth.js
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@ -9,8 +9,7 @@ var secp256k1 = ecurve.getCurveByName('secp256k1')
var G = secp256k1.G var G = secp256k1.G
var n = secp256k1.n var n = secp256k1.n
// c = sha256: e * (d * G) // vG = (dG * sha256(e * dG)G)
// vG = (d * G) + (c * G)
function stealthSend (e, Q) { function stealthSend (e, Q) {
var eQ = Q.multiply(e) // shared secret var eQ = Q.multiply(e) // shared secret
@ -22,9 +21,7 @@ function stealthSend (e, Q) {
return vG return vG
} }
// c = sha256: d * (e * G) // v = (d + sha256(eG * d))
// v = (d + c)
// vG = (d + c) * G
function stealthReceive (d, eG) { function stealthReceive (d, eG) {
var eQ = eG.multiply(d) // shared secret var eQ = eG.multiply(d) // shared secret
@ -34,12 +31,13 @@ function stealthReceive (d, eG) {
return v return v
} }
function stealthRecoverLeaked (d, e, Q) { // d = (v - sha256(e * dG))
function stealthRecoverLeaked (v, e, Q) {
var eQ = Q.multiply(e) // shared secret var eQ = Q.multiply(e) // shared secret
var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded())) var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded()))
var v = new bitcoin.ECPair(d.subtract(c).mod(n)) var d = new bitcoin.ECPair(v.subtract(c).mod(n))
return v return d
} }
describe('bitcoinjs-lib (crypto)', function () { describe('bitcoinjs-lib (crypto)', function () {