StealthTx
For spotting transactions to which you have the stealth key (or at least the scan key) and creating transactions to a stealth address. So far it is only partially working - you can see if a transaction is a stealth transaction (or at least one of a limited kind of stealth transactions), and you can see that you do not have the stealth key to spend one of these transactions. However, I have not yet tested whether you can see a stealth transaction that you actually have the key to. Also, it is not yet easy to spend to a stealth address.
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var StealthAddress = require('./stealthaddress');
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var StealthKey = require('./stealthkey');
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var Transaction = require('../transaction');
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var Pubkey = require('../pubkey');
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var StealthTx = function StealthTx(tx, sa, sk) {
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if (!(this instanceof StealthTx))
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return new StealthTx(tx, sa, sk);
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if (tx instanceof Transaction) {
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this.tx = tx;
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this.sa = sa;
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this.sk = sk;
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} else if (tx) {
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var obj = tx;
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this.set(obj);
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}
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};
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StealthTx.prototype.set = function(obj) {
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this.sk = obj.sk || this.sk;
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this.sa = obj.sa || this.sa;
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this.tx = obj.tx || this.tx;
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return this;
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};
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StealthTx.prototype.isForMe = function() {
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if (!this.notMine())
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return true;
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else
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return false;
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};
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StealthTx.prototype.notMine = function() {
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var err;
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if (err = this.notStealth())
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return "Not stealth: " + err;
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var txopbuf = this.tx.txouts[0].script.chunks[1].buf;
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var parsed = StealthTx.parseOpReturnData(txopbuf);
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var pubkey = parsed.pubkey;
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var pubkeyhashbuf = this.tx.txouts[1].script.chunks[2].buf;
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var sk = this.sk;
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if (sk.isForMe(pubkey, pubkeyhashbuf)) {
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return false;
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} else {
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return "StealthTx not mine";
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}
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};
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//For now, we only support a very limited variety of stealth tx
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StealthTx.prototype.notStealth = function() {
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var txouts = this.tx.txouts;
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if (!(txouts.length >= 2))
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return "Not enough txouts";
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if (!txouts[0].script.isOpReturn())
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return "First txout is not OP_RETURN";
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if (!txouts[1].script.isPubkeyhashOut())
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return "Second txout is not pubkeyhash";
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return false;
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};
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StealthTx.parseOpReturnData = function(buf) {
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var parsed = {};
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parsed.version = buf[0];
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parsed.noncebuf = buf.slice(1, 5);
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parsed.pubkey = Pubkey().fromBuffer(buf.slice(5, 5 + 33));
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return parsed;
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};
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module.exports = StealthTx;
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var should = require('chai').should();
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var Txout = require('../lib/txout');
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var Stealthkey = require('../lib/expmt/stealthkey');
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var StealthTx = require('../lib/expmt/stealthtx');
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var Transaction = require('../lib/transaction');
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var Varint = require('../lib/varint');
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describe('StealthTx', function() {
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var txhex = '0100000001c828ccce36eca04f96321ad488528af86c7598e67157c4f8e2f462a9e0e3af5f010000006a47304402204525eef6a56cc57fb184e53efdfdc1086d5265da21480d55c2184536440a64f70220349cdc6c66a8507dde0d172fe64aeb57ae56e014b50315f615086a6b85c5424e012102c0633ddb6bf2a8686e2ba4ce8026c94e1e27ef12e73f8fed6d6d2b97199f9b74ffffffff020000000000000000286a2606deadbeef0365b5a5b0ba059666e907b0b5e07b37fdb162d1399ed829315491fe1f30c87b3f905f0100000000001976a9142042d5e7ef9e82346419fbfe7df5ae52fe4bea3c88ac00000000';
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var txbuf = new Buffer(txhex, 'hex');
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var txidhex = '66da969fff214c329e27062beaf3baf20ed035801559b31f3e868c2de4cdfc5b';
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var tx = Transaction(txbuf);
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it('should make a new StealthTx', function() {
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var stx = new StealthTx();
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should.exist(stx);
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stx = StealthTx();
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should.exist(stx);
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});
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describe('#isForMe', function() {
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it('should return false for this known tx and random stealthkey', function() {
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var sk = Stealthkey().fromRandom();
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var stx = StealthTx().set({sk: sk, tx: tx});
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stx.isForMe().should.equal(false);
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});
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});
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describe('#notMine', function() {
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it('should return true for this known tx and random stealthkey', function() {
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var sk = Stealthkey().fromRandom();
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var stx = StealthTx().set({sk: sk, tx: tx});
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stx.notMine().should.equal("StealthTx not mine");
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});
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});
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describe('#notStealth', function() {
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it('should know this is a stealth tx', function() {
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var stx = StealthTx().set({tx: tx});
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stx.notStealth().should.equal(false);
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});
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it('should know this is not a stealth tx', function() {
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var tx2 = Transaction(tx);
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tx2.txouts.pop();
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tx2.txoutsvi = Varint(1);
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var stx = StealthTx().set({tx: tx2});
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stx.notStealth().should.equal("Not enough txouts");
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});
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});
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describe('@parseOpReturnData', function() {
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var txout = tx.txouts[0];
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var buf = txout.script.chunks[1].buf;
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var parsed = StealthTx.parseOpReturnData(buf);
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(typeof parsed.version).should.equal('number');
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parsed.noncebuf.length.should.be.above(0);
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parsed.pubkey.toBuffer().length.should.equal(33);
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});
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});
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