mirror of https://github.com/BTCPrivate/copay.git
add support for 8 byte big endian nonce to Message
...network protocol is backwards incompatible with previous network protocl. also includes a second version number for backwards-compatible changes (the original version number was for backwards-incompatible changes).
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@ -7,9 +7,20 @@ var bitcore = require('bitcore');
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var Message = function() {
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};
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Message.encode = function(topubkey, fromkey, payload) {
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var version = new Buffer([0]);
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var toencrypt = Buffer.concat([version, payload]);
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Message.encode = function(topubkey, fromkey, payload, opts) {
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var version1 = new Buffer([1]); //peers will reject messges containing not-understood version1
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//i.e., increment version1 to prevent communications with old clients
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var version2 = new Buffer([0]); //peers will not reject messages containing not-understood version2
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//i.e., increment version2 to allow communication with old clients, but signal new clients
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if (opts && opts.nonce && Buffer.isBuffer(opts.nonce) && opts.nonce.length == 8) {
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var nonce = opts.nonce;
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} else {
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var nonce = new Buffer(8);
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nonce.fill(0); //nonce is a big endian 8 byte number
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}
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var toencrypt = Buffer.concat([version1, version2, nonce, payload]);
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var encrypted = Message._encrypt(topubkey, toencrypt);
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var sig = Message._sign(fromkey, encrypted);
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var encoded = {
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@ -20,7 +31,14 @@ Message.encode = function(topubkey, fromkey, payload) {
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return encoded;
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};
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Message.decode = function(key, encoded) {
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Message.decode = function(key, encoded, opts) {
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if (opts && opts.prevnonce && Buffer.isBuffer(opts.prevnonce) && opts.prevnonce.length == 8) {
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var prevnonce = opts.prevnonce;
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} else {
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var prevnonce = new Buffer(8);
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prevnonce.fill(0); //nonce is a big endian 8 byte number
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}
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try {
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var frompubkey = new Buffer(encoded.pubkey, 'hex');
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} catch (e) {
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@ -40,8 +58,9 @@ Message.decode = function(key, encoded) {
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throw new Error('Error verifying signature: ' + e);
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}
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if (!v)
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if (!v) {
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throw new Error('Invalid signature');
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}
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try {
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var decrypted = Message._decrypt(key.private, encrypted);
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@ -49,14 +68,59 @@ Message.decode = function(key, encoded) {
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throw new Error('Cannot decrypt data: ' + e);
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}
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if (decrypted[0] !== 0)
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throw new Error('Invalid version number');
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try {
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var version1 = decrypted[0];
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var version2 = decrypted[1];
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var nonce = decrypted.slice(2, 10);
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var payload = decrypted.slice(10);
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} catch (e) {
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throw new Error('Cannot parse decrypted data: ' + e);
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}
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if (decrypted.length === 0)
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if (payload.length === 0) {
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throw new Error('No data present');
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}
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var payload = decrypted.slice(1);
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return payload;
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if (version1 !== 1) {
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throw new Error('Invalid version number');
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}
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if (version2 !== 0) {
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//put special version2 handling code here, if ever needed
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}
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if (!Message._noncegt(nonce, prevnonce) && prevnonce.toString('hex') !== '0000000000000000') {
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throw new Error('Nonce not equal to zero and not greater than the previous nonce');
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}
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var decoded = {
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version1: version1,
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version2: version2,
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nonce: nonce,
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payload: payload
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};
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return decoded;
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};
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//return true if nonce > prevnonce; false otherwise
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Message._noncegt = function(nonce, prevnonce) {
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var noncep1 = nonce.slice(0, 4).readUInt32BE(0);
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var prevnoncep1 = prevnonce.slice(0, 4).readUInt32BE(0);
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if (noncep1 > prevnoncep1)
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return true;
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if (noncep1 < prevnoncep1)
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return false;
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var noncep2 = nonce.slice(4, 8).readUInt32BE(0);
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var prevnoncep2 = prevnonce.slice(4, 8).readUInt32BE(0);
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if (noncep2 > prevnoncep2)
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return true;
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return false;
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};
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Message._encrypt = function(topubkey, payload, r, iv) {
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@ -376,18 +376,19 @@ Network.prototype.getPeer = function() {
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return this.peer;
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};
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Network.prototype._encode = function(topubkey, fromkey, payload) {
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var encoded = Message.encode(topubkey, fromkey, payload);
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Network.prototype._encode = function(topubkey, fromkey, payload, opts) {
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var encoded = Message.encode(topubkey, fromkey, payload, opts);
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return encoded;
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};
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Network.prototype._decode = function(key, encoded) {
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var payload = Message.decode(key, encoded);
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Network.prototype._decode = function(key, encoded, opts) {
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var decoded = Message.decode(key, encoded, opts);
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var payload = decoded.payload;
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return payload;
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};
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Network.prototype._sendToOne = function(copayerId, payload, cb) {
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Network.prototype._sendToOne = function(copayerId, payload, opts, cb) {
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if (!Buffer.isBuffer(payload))
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throw new Error('payload must be a buffer');
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var peerId = this.peerFromCopayer(copayerId);
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@ -400,7 +401,7 @@ Network.prototype._sendToOne = function(copayerId, payload, cb) {
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if (typeof cb === 'function') cb();
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};
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Network.prototype.send = function(copayerIds, payload, cb) {
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Network.prototype.send = function(copayerIds, payload, opts, cb) {
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if (!payload) return cb();
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var self = this;
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@ -421,7 +422,7 @@ Network.prototype.send = function(copayerIds, payload, cb) {
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var copayerIdBuf = new Buffer(copayerId, 'hex');
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var encPayload = self._encode(copayerIdBuf, self.getKey(), payloadBuf);
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var enc = new Buffer(JSON.stringify(encPayload));
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self._sendToOne(copayerId, enc, function() {
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self._sendToOne(copayerId, enc, opts, function() {
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if (++i === l && typeof cb === 'function') cb();
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});
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});
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@ -36,15 +36,70 @@ describe('Message model', function() {
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var encoded = Message.encode(key2.public, key, message);
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var decoded = Message.decode(key2, encoded);
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decoded.toString('hex').should.equal(messagehex);
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var payload = decoded.payload;
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payload.toString('hex').should.equal(messagehex);
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});
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it('should decode an encoded message with proper prevnonce', function() {
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var message = new Buffer('message');
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var messagehex = message.toString('hex');
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var nonce = new Buffer([0, 0, 0, 0, 0, 0, 0, 2]);
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var opts = {nonce: nonce};
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var encoded = Message.encode(key2.public, key, message, opts);
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var prevnonce = new Buffer([0, 0, 0, 0, 0, 0, 0, 1]);
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opts = {prevnonce: prevnonce};
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var decoded = Message.decode(key2, encoded, opts);
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var payload = decoded.payload;
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payload.toString('hex').should.equal(messagehex);
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});
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it('should decode an encoded message with proper prevnonce - for first part', function() {
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var message = new Buffer('message');
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var messagehex = message.toString('hex');
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var nonce = new Buffer([0, 0, 0, 2, 0, 0, 0, 0]);
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var opts = {nonce: nonce};
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var encoded = Message.encode(key2.public, key, message, opts);
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var prevnonce = new Buffer([0, 0, 0, 1, 0, 0, 0, 0]);
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opts = {prevnonce: prevnonce};
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var decoded = Message.decode(key2, encoded, opts);
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var payload = decoded.payload;
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payload.toString('hex').should.equal(messagehex);
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});
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it('should fail if prevnonce is too high', function() {
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var message = new Buffer('message');
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var messagehex = message.toString('hex');
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var nonce = new Buffer([0, 0, 0, 0, 0, 0, 0, 1]);
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var opts = {nonce: nonce};
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var encoded = Message.encode(key2.public, key, message, opts);
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var prevnonce = new Buffer([0, 0, 0, 0, 0, 0, 0, 1]);
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opts = {prevnonce: prevnonce};
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(function() {Message.decode(key2, encoded, opts)}).should.throw('Nonce not equal to zero and not greater than the previous nonce');
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});
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it('should fail if prevnonce is too high - for first part', function() {
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var message = new Buffer('message');
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var messagehex = message.toString('hex');
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var nonce = new Buffer([0, 0, 0, 1, 0, 0, 0, 0]);
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var opts = {nonce: nonce};
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var encoded = Message.encode(key2.public, key, message, opts);
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var prevnonce = new Buffer([0, 0, 0, 1, 0, 0, 0, 0]);
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opts = {prevnonce: prevnonce};
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(function() {Message.decode(key2, encoded, opts)}).should.throw('Nonce not equal to zero and not greater than the previous nonce');
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});
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it('should fail if the version number is incorrect', function() {
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var payload = new Buffer('message');
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var fromkey = key;
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var topubkey = key2.public;
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var version = new Buffer([1]);
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var toencrypt = Buffer.concat([version, payload]);
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var version1 = new Buffer([2]);
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var version2 = new Buffer([0]);
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var nonce = new Buffer([0, 0, 0, 0, 0, 0, 0, 0]);
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var toencrypt = Buffer.concat([version1, version2, nonce, payload]);
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var encrypted = Message._encrypt(topubkey, toencrypt);
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var sig = Message._sign(fromkey, encrypted);
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var encoded = {
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@ -168,11 +168,11 @@ describe('Network / WebRTC', function() {
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key.regenerateSync();
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var copayerId = key.public.toString('hex');
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n._sendToOne = function(a1, a2, cb) {
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n._sendToOne = function(a1, a2, a3, cb) {
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cb();
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};
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var sig = undefined;
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n.send(copayerId, data, function() {
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var opts = {};
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n.send(copayerId, data, opts, function() {
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done();
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});
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@ -191,13 +191,13 @@ describe('Network / WebRTC', function() {
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key.regenerateSync();
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var copayerId = key.public.toString('hex');
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n._sendToOne = function(a1, enc, cb) {
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n._sendToOne = function(a1, enc, opts, cb) {
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var encPayload = JSON.parse(enc.toString());
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encPayload.sig.length.should.be.greaterThan(0);
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cb();
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};
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var sig = undefined;
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n.send(copayerId, data, function() {
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var opts = {};
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n.send(copayerId, data, opts, function() {
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done();
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});
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@ -216,11 +216,11 @@ describe('Network / WebRTC', function() {
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key.regenerateSync();
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var copayerIds = [key.public.toString('hex')];
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n._sendToOne = function(a1, a2, cb) {
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n._sendToOne = function(a1, a2, a3, cb) {
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cb();
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};
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var sig = undefined;
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n.send(copayerIds, data, function() {
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var opts = {};
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n.send(copayerIds, data, opts, function() {
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done();
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});
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