basic stealth address support
Math only. Does not yet support transactions. Not yet compatible with Dark Wallet.
This commit is contained in:
Ryan X. Charles
parent
f8fc3812f0
commit
bc1c4235f2
4
index.js
4
index.js
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@ -18,8 +18,8 @@ privsec.Random = require('./lib/random');
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privsec.Signature = require('./lib/signature');
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//experimental
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//privsec.expmt = {};
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//privsec.expmt.Stealth = require('./lib/expmt/stealth');
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privsec.expmt = {};
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privsec.expmt.Stealth = require('./lib/expmt/stealth');
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//dependencies
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privsec.deps = {};
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@ -0,0 +1,111 @@
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var Key = require('../key');
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var Privkey = require('../privkey');
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var Pubkey = require('../pubkey');
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var Hash = require('../hash');
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var KDF = require('../kdf');
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var base58check = require('../base58check');
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var Stealth = function Stealth(payloadKey, scanKey) {
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if (!(this instanceof Stealth))
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return new Stealth(payloadKey, scanKey);
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this.payloadKey = payloadKey;
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this.scanKey = scanKey;
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};
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Stealth.prototype.fromAddressBuffer = function(buf) {
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if (!Buffer.isBuffer(buf) || buf.length !== 66)
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throw new Error('stealth: A stealth address must have length 66');
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var pPubBuf = buf.slice(0, 33);
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var sPubBuf = buf.slice(33, 66);
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var payloadPubkey = Pubkey().fromDER(pPubBuf);
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this.payloadKey = Key(undefined, payloadPubkey);
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var scanPubkey = Pubkey().fromDER(sPubBuf);
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this.scanKey = Key(undefined, scanPubkey);
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return this;
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};
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Stealth.prototype.fromAddressString = function(str) {
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var buf = base58check.decode(str);
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this.fromAddressBuffer(buf);
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return this;
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};
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Stealth.prototype.fromRandom = function() {
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this.payloadKey = Key().fromRandom();
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this.scanKey = Key().fromRandom();
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return this;
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};
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Stealth.prototype.getSharedKeyAsReceiver = function(senderPubkey) {
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var sharedSecretPoint = senderPubkey.point.mul(this.scanKey.privkey.bn);
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var sharedSecretPubkey = Pubkey(sharedSecretPoint);
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKey = KDF.sha256hmac2key(buf);
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return sharedKey;
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};
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Stealth.prototype.getSharedKeyAsSender = function(senderKey) {
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var sharedSecretPoint = this.scanKey.pubkey.point.mul(senderKey.privkey.bn);
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var sharedSecretPubkey = Pubkey(sharedSecretPoint);
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var buf = sharedSecretPubkey.toDER(true);
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var sharedKey = KDF.sha256hmac2key(buf);
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return sharedKey;
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};
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Stealth.prototype.getReceivePubkeyAsReceiver = function(senderPubkey) {
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var sharedKey = this.getSharedKeyAsReceiver(senderPubkey);
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var pubkey = Pubkey(this.payloadKey.pubkey.point.add(sharedKey.pubkey.point));
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return pubkey;
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};
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Stealth.prototype.getReceivePubkeyAsSender = function(senderKey) {
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var sharedKey = this.getSharedKeyAsSender(senderKey);
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var pubkey = Pubkey(this.payloadKey.pubkey.point.add(sharedKey.pubkey.point));
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return pubkey;
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};
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Stealth.prototype.getReceiveKey = function(senderPubkey) {
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var sharedKey = this.getSharedKeyAsReceiver(senderPubkey);
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var privkey = Privkey(this.payloadKey.privkey.bn.add(sharedKey.privkey.bn));
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var key = Key(privkey);
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key.privkey2pubkey();
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return key;
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};
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Stealth.prototype.isForMe = function(senderPubkey, myPossiblePubkeyhash) {
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var pubkey = this.getReceivePubkeyAsReceiver(senderPubkey);
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var pubkeybuf = pubkey.toDER(true);
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var pubkeyhash = Hash.sha256ripemd160(pubkeybuf);
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if (pubkeyhash.toString('hex') === myPossiblePubkeyhash.toString('hex'))
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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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Stealth.prototype.toAddressBuffer = function() {
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var pBuf = this.payloadKey.pubkey.toDER(true);
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var sBuf = this.scanKey.pubkey.toDER(true);
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return Buffer.concat([pBuf, sBuf]);
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};
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Stealth.prototype.toAddressString = function() {
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var buf = this.toAddressBuffer();
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var b58 = base58check.encode(buf);
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return b58;
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};
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module.exports = Stealth;
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@ -0,0 +1,177 @@
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var should = require('chai').should();
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var Stealth = require('../lib/expmt/stealth');
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var Key = require('../lib/key');
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var Privkey = require('../lib/privkey');
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var Pubkey = require('../lib/pubkey');
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var BN = require('../lib/bn');
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var Hash = require('../lib/hash');
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var base58check = require('../lib/base58check');
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describe('stealth', function() {
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var stealth = Stealth();
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stealth.payloadKey = Key();
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stealth.payloadKey.privkey = Privkey();
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stealth.payloadKey.privkey.bn = BN().fromBuffer(Hash.sha256(new Buffer('test 1')));
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stealth.payloadKey.privkey2pubkey();
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stealth.scanKey = Key();
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stealth.scanKey.privkey = Privkey();
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stealth.scanKey.privkey.bn = BN().fromBuffer(Hash.sha256(new Buffer('test 2')));
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stealth.scanKey.privkey2pubkey();
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var senderKey = Key();
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senderKey.privkey = Privkey();
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senderKey.privkey.bn = BN().fromBuffer(Hash.sha256(new Buffer('test 3')));
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senderKey.privkey2pubkey();
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var addressString = '9dDbC9FzZ74r8njQkXD6W27gtrxLiWaeFPHxeo1fynQRXPicqxVt7u95ozbwoVVMXyrzaHKN9owsteg63FgwDfrxWx82SAW';
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it('should create a new stealth', function() {
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var stealth = new Stealth();
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should.exist(stealth);
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});
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it('should create a new stealth without using "new"', function() {
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var stealth = Stealth();
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should.exist(stealth);
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});
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describe('#fromAddressBuffer', function() {
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it('should give a stealth address with the right pubkeys', function() {
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var stealth2 = new Stealth();
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var buf = base58check.decode(addressString);
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stealth2.fromAddressBuffer(buf);
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stealth2.payloadKey.pubkey.toString().should.equal(stealth.payloadKey.pubkey.toString());
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stealth2.scanKey.pubkey.toString().should.equal(stealth.scanKey.pubkey.toString());
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});
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});
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describe('#fromAddressString', function() {
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it('should give a stealth address with the right pubkeys', function() {
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var stealth2 = new Stealth();
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stealth2.fromAddressString(addressString);
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stealth2.payloadKey.pubkey.toString().should.equal(stealth.payloadKey.pubkey.toString());
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stealth2.scanKey.pubkey.toString().should.equal(stealth.scanKey.pubkey.toString());
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});
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});
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describe('#fromRandom', function() {
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it('should create a new stealth from random', function() {
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var stealth = Stealth().fromRandom();
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should.exist(stealth.payloadKey.privkey.bn.gt(0));
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should.exist(stealth.scanKey.privkey.bn.gt(0));
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});
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});
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describe('#getSharedKeyAsReceiver', function() {
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it('should return a key', function() {
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var key = stealth.getSharedKeyAsReceiver(senderKey.pubkey);
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(key instanceof Key).should.equal(true);
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});
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});
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describe('#getSharedKeyAsSender', function() {
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it('should return a key', function() {
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var stealth2 = new Stealth();
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stealth2.payloadKey = new Key();
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stealth2.payloadKey.pubkey = stealth.payloadKey.pubkey;
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stealth2.scanKey = new Key();
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stealth2.scanKey.pubkey = stealth.scanKey.pubkey;
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var key = stealth2.getSharedKeyAsSender(senderKey);
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(key instanceof Key).should.equal(true);
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});
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it('should return the same key as getSharedKeyAsReceiver', function() {
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var stealth2 = new Stealth();
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stealth2.payloadKey = new Key();
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stealth2.payloadKey.pubkey = stealth.payloadKey.pubkey;
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stealth2.scanKey = new Key();
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stealth2.scanKey.pubkey = stealth.scanKey.pubkey;
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var key = stealth2.getSharedKeyAsSender(senderKey);
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var key2 = stealth.getSharedKeyAsReceiver(senderKey.pubkey);
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key.toString().should.equal(key2.toString());
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});
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});
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describe('#getReceivePubkeyAsReceiver', function() {
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it('should return a pubkey', function() {
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var pubkey = stealth.getReceivePubkeyAsReceiver(senderKey.pubkey);
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(pubkey instanceof Pubkey).should.equal(true);
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});
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});
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describe('#getReceivePubkeyAsSender', function() {
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it('should return a pubkey', function() {
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var pubkey = stealth.getReceivePubkeyAsSender(senderKey);
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(pubkey instanceof Pubkey).should.equal(true);
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});
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it('should return the same pubkey as getReceivePubkeyAsReceiver', function() {
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var pubkey = stealth.getReceivePubkeyAsSender(senderKey);
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var pubkey2 = stealth.getReceivePubkeyAsReceiver(senderKey.pubkey);
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pubkey2.toString().should.equal(pubkey.toString());
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});
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});
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describe('#getReceiveKey', function() {
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it('should return a key', function() {
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var key = stealth.getReceiveKey(senderKey.pubkey);
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(key instanceof Key).should.equal(true);
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});
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it('should return a key with the same pubkey as getReceivePubkeyAsReceiver', function() {
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var key = stealth.getReceiveKey(senderKey.pubkey);
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var pubkey = stealth.getReceivePubkeyAsReceiver(senderKey.pubkey);
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key.pubkey.toString().should.equal(pubkey.toString());
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});
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});
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describe('#isForMe', function() {
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it('should return true if it (the transaction or message) is for me', function() {
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var pubkeyhash = new Buffer('3cb64fa6ee9b3e8754e3e2bd033bf61048604a99', 'hex');
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stealth.isForMe(senderKey.pubkey, pubkeyhash).should.equal(true);
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});
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it('should return false if it (the transaction or message) is not for me', function() {
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var pubkeyhash = new Buffer('00b64fa6ee9b3e8754e3e2bd033bf61048604a99', 'hex');
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stealth.isForMe(senderKey.pubkey, pubkeyhash).should.equal(false);
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});
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});
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describe('#toAddressBuffer', function() {
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it('should return this known address buffer', function() {
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var buf = stealth.toAddressBuffer();
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base58check.encode(buf).should.equal(addressString);
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});
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});
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describe('#toAddressString', function() {
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it('should return this known address string', function() {
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stealth.toAddressString().should.equal(addressString);
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});
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});
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});
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