1139 lines
41 KiB
JavaScript
1139 lines
41 KiB
JavaScript
/**
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* Working with objects.
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* NOTE: Most operations with objects are asynchronous and return
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* promises.
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* @see {@link https://pybitmessage.rtfd.io/en/v0.6/protocol.html#object-types}
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* @module bitmessage/objects
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*/
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"use strict";
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var objectAssign = Object.assign || require("object-assign");
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var bufferEqual = require("buffer-equal");
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var assert = require("./_util").assert;
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var PPromise = require("./platform").Promise;
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var bmcrypto = require("./crypto");
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var Address = require("./address");
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var structs = require("./structs");
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var POW = require("./pow");
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var util = require("./_util");
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var var_int = structs.var_int;
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var PubkeyBitfield = structs.PubkeyBitfield;
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var message = structs.message;
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var object = structs.object;
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/**
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* Try to get type of the given encoded object message.
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* Note that this function doesn't do any validation because it is
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* already provided by
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* [object.decode]{@link module:bitmessage/structs.object.decode}
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* routine. Normally you call this for each incoming object message and
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* then call decode function of the appropriate object handler.
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* @param {Buffer} buf - Buffer that starts with encoded object message
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* @return {?number} Object's type if any.
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*/
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exports.getType = function(buf) {
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// Message header: 4 + 12 + 4 + 4
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// Object header: 8 + 8 + 4
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if (buf.length < 44) {
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return;
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}
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return buf.readUInt32BE(40, true);
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};
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/**
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* Try to get type of the given object message payload.
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* The same as [getType]{@link module:bitmessage/objects.getType}.
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*/
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exports.getPayloadType = function(buf) {
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// Object header: 8 + 8 + 4
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if (buf.length < 20) {
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return;
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}
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return buf.readUInt32BE(16, true);
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};
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// Prepend nonce to a given object without nonce.
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function prependNonce(obj, opts) {
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return new PPromise(function(resolve) {
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assert(obj.length <= 262136, "object message payload is too big");
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opts = objectAssign({}, opts);
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var nonce, target, powp;
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if (opts.skipPow) {
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nonce = Buffer.alloc(8);
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nonce.fill(0);
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resolve(Buffer.concat([nonce, obj]));
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} else {
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opts.payloadLength = obj.length + 8; // Compensate for nonce
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target = POW.getTarget(opts);
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powp = POW.doAsync({target: target, data: obj})
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.then(function(nonce) {
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// TODO(Kagami): We may want to receive nonce as a Buffer from
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// POW module to skip conversion step.
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var payload = Buffer.alloc(opts.payloadLength);
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util.writeUInt64BE(payload, nonce, 0, true);
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obj.copy(payload, 8);
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return payload;
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});
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resolve(powp);
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}
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});
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}
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/**
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* `getpubkey` object. When a node has the hash of a public key (from an
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* address) but not the public key itself, it must send out a request
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* for the public key.
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* @see {@link https://pybitmessage.rtfd.io/en/v0.6/protocol.html#getpubkey}
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* @namespace
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* @static
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*/
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var getpubkey = exports.getpubkey = {
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/**
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* @typedef {Object} DecodeResult
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* @property {Buffer} nonce - A 8-byte object nonce
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* @property {number} ttl - Time to live in seconds
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* @property {Date} expires - Object expiration date
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* @property {number} type - Object type
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* @property {number} version - Object version
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* @property {number} stream - Object stream
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* @property {number} headerLength - Length of the object header
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* @property {Buffer} ripe - The RIPEMD hash of the requested public
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* keys for address version <= 3
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* @property {Buffer} tag - ...or tag derived from the address object
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* for address version >= 4
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* @property {number} length - Real data length
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* @memberof module:bitmessage/objects.getpubkey
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*/
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/**
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* Decode `getpubkey` object message.
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* @param {Buffer} buf - Message
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* @param {Object=} opts - Any of [object.decode]{@link
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* module:bitmessage/structs.object.decode} options
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* @return {Promise.<DecodeResult>} A promise that contains
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* [decoded `getpubkey` structure]{@link
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* module:bitmessage/objects.getpubkey.DecodeResult} when fulfilled.
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*/
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decodeAsync: function(buf, opts) {
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return new PPromise(function(resolve) {
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var decoded = message.decode(buf);
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assert(decoded.command === "object", "Bad command");
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resolve(getpubkey.decodePayloadAsync(decoded.payload, opts));
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});
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},
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/**
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* Decode `getpubkey` object message payload.
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* The same as [decodeAsync]{@link
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* module:bitmessage/objects.getpubkey.decodeAsync}.
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*/
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decodePayloadAsync: function(buf, opts) {
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return new PPromise(function(resolve) {
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var decoded = object.decodePayload(buf, opts);
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assert(decoded.type === object.GETPUBKEY, "Wrong object type");
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assert(decoded.version >= 2, "getpubkey version is too low");
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assert(decoded.version <= 4, "getpubkey version is too high");
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var objectPayload = util.popkey(decoded, "objectPayload");
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if (decoded.version < 4) {
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assert(objectPayload.length === 20, "getpubkey ripe is too small");
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// Object payload is copied so it's safe to return it right away.
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decoded.ripe = objectPayload;
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} else {
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assert(objectPayload.length === 32, "getpubkey tag is too small");
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// Object payload is copied so it's safe to return it right away.
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decoded.tag = objectPayload;
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}
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resolve(decoded);
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});
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},
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/**
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* Encode `getpubkey` object message.
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* @param {Object} opts - `getpubkey` object options
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* @param {number} opts.ttl - Time to live in seconds
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* @param {Address} opts.to - Receiver of the message
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* @param {boolean=} opts.skipPow - Do not compute POW (false by
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* default)
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* @return {Promise.<Buffer>} A promise that contains encoded message
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* when fulfilled.
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*/
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encodeAsync: function(opts) {
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return getpubkey.encodePayloadAsync(opts).then(function(payload) {
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return message.encode("object", payload);
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});
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},
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/**
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* Encode `getpubkey` object message payload.
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* The same as
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* [encodeAsync]{@link module:bitmessage/objects.getpubkey.encodeAsync}.
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*/
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encodePayloadAsync: function(opts) {
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return new PPromise(function(resolve) {
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opts = objectAssign({}, opts);
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opts.type = object.GETPUBKEY;
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// Bitmessage address of recepeint of `getpubkey` message.
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var to = Address.decode(opts.to);
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assert(to.version >= 2, "Address version is too low");
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assert(to.version <= 4, "Address version is too high");
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opts.version = to.version;
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opts.stream = to.stream;
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opts.objectPayload = to.version < 4 ? to.ripe : to.getTag();
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var obj = object.encodePayloadWithoutNonce(opts);
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resolve(prependNonce(obj, opts));
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});
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},
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};
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// Extract pubkey data from decrypted object payload.
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function extractPubkey(buf) {
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var decoded = {length: 132};
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// We assume here that input buffer was copied before so it's safe to
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// return reference to it.
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decoded.behavior = PubkeyBitfield(buf.slice(0, 4));
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var signPublicKey = decoded.signPublicKey = Buffer.alloc(65);
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signPublicKey[0] = 4;
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buf.copy(signPublicKey, 1, 4, 68);
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var encPublicKey = decoded.encPublicKey = Buffer.alloc(65);
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encPublicKey[0] = 4;
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buf.copy(encPublicKey, 1, 68, 132);
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return decoded;
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}
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// Extract pubkey version 3 data from decrypted object payload.
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function extractPubkeyV3(buf) {
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var decoded = extractPubkey(buf);
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var decodedTrials = var_int.decode(buf.slice(132));
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decoded.nonceTrialsPerByte = decodedTrials.value;
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decoded.length += decodedTrials.length;
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var decodedExtraBytes = var_int.decode(decodedTrials.rest);
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decoded.payloadLengthExtraBytes = decodedExtraBytes.value;
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decoded.length += decodedExtraBytes.length;
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var decodedSigLength = var_int.decode(decodedExtraBytes.rest);
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var siglen = decodedSigLength.value;
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var rest = decodedSigLength.rest;
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assert(rest.length >= siglen, "Bad pubkey object payload length");
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decoded.signature = rest.slice(0, siglen);
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siglen += decodedSigLength.length;
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decoded._siglen = siglen; // Internal value
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decoded.length += siglen;
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return decoded;
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}
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// Note that tag matching only works for address version >= 4.
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function findAddrByTag(addrs, tag) {
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var i, addr;
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addrs = addrs || [];
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if (Address.isAddress(addrs)) {
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addrs = [addrs];
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}
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if (Array.isArray(addrs)) {
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for (i = 0; i < addrs.length; i++) {
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addr = addrs[i];
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if (addr.version >= 4 && bufferEqual(addr.getTag(), tag)) {
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return addr;
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}
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}
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} else {
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addr = addrs[tag];
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if (addr && addr.version >= 4) {
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return addr;
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}
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}
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}
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/**
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* `pubkey` object.
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* @see {@link https://pybitmessage.rtfd.io/en/v0.6/protocol.html#pubkey}
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* @namespace
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* @static
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*/
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var pubkey = exports.pubkey = {
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/**
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* @typedef {Object} DecodeResult
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* @property {Buffer} nonce - A 8-byte object nonce
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* @property {number} ttl - Time to live in seconds
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* @property {Date} expires - Object expiration date
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* @property {number} type - Object type
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* @property {number} version - Object version
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* @property {number} stream - Object stream
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* @property {number} headerLength - Length of the object header
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* @property {Buffer} tag - Tag derived from the address object
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* (present only if object version is 4)
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* @property {Object} behavior - [Pubkey features]{@link
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* module:bitmessage/structs.PubkeyBitfield} that can be expected from
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* the node
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* @property {Buffer} signPublicKey - Signing public key
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* @property {Buffer} encPublicKey - Encryption public key
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* @property {number} nonceTrialsPerByte - Difficulty parameter of the
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* node (present only for `pubkey` version >= 3)
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* @property {number} payloadLengthExtraBytes - Difficulty parameter
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* of the node (present only for `pubkey` version >= 3)
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* @property {Buffer} signature - Signature of the message (present
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* only for `pubkey` version >= 3)
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* @property {number} length - Real data length
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* @memberof module:bitmessage/objects.pubkey
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*/
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/**
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* Decode `pubkey` object message.
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* @param {Buffer} buf - Message
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* @param {Object=} opts - Any of [object.decode]{@link
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* module:bitmessage/structs.object.decode} options and:
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* @param {(Address[]|Address|Object)} opts.needed - Address objects
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* which represent pubkeys that we are interested in (used only for
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* pubkeys v4). It is either addresses array or single address or
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* Object addr-by-tag. Time to match the key is O(n), O(1), O(1)
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* respectfully.
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* @return {Promise.<DecodeResult>} A promise that contains
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* [decoded `pubkey` structure]{@link
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* module:bitmessage/objects.pubkey.DecodeResult}
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* when fulfilled.
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*/
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decodeAsync: function(buf, opts) {
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return new PPromise(function(resolve) {
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var decoded = message.decode(buf);
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assert(decoded.command === "object", "Bad command");
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resolve(pubkey.decodePayloadAsync(decoded.payload, opts));
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});
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},
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/**
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* Decode `pubkey` object message payload.
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* The same as [decodeAsync]{@link
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* module:bitmessage/objects.pubkey.decodeAsync}.
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*/
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decodePayloadAsync: function(buf, opts) {
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return new PPromise(function(resolve) {
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opts = opts || {};
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var decoded = object.decodePayload(buf, opts);
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assert(decoded.type === object.PUBKEY, "Wrong object type");
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var version = decoded.version;
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assert(version >= 2, "Address version is too low");
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assert(version <= 4, "Address version is too high");
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var objectPayload = util.popkey(decoded, "objectPayload");
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var siglen, pos, sig, dataToVerify, pubkeyp;
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var tag, addr, pubkeyPrivateKey, dataToDecrypt;
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// v2 pubkey.
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if (version === 2) {
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// 4 + 64 + 64
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assert(
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objectPayload.length === 132,
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"Bad pubkey v2 object payload length");
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objectAssign(decoded, extractPubkey(objectPayload));
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return resolve(decoded);
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}
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// v3 pubkey.
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if (version === 3) {
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// 4 + 64 + 64 + (1+) + (1+) + (1+)
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assert(
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objectPayload.length >= 135,
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"Bad pubkey v3 object payload length");
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objectAssign(decoded, extractPubkeyV3(objectPayload));
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siglen = util.popkey(decoded, "_siglen");
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pos = decoded.headerLength + decoded.length - siglen;
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// Object message payload from `expiresTime` up to `sig_length`.
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dataToVerify = buf.slice(8, pos);
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sig = decoded.signature;
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pubkeyp = bmcrypto.verify(decoded.signPublicKey, dataToVerify, sig)
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.then(function() {
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return decoded;
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});
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return resolve(pubkeyp);
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}
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// v4 pubkey.
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assert(objectPayload.length >= 32, "Bad pubkey v4 object payload length");
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tag = decoded.tag = objectPayload.slice(0, 32);
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addr = findAddrByTag(opts.needed, tag);
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assert(addr, "You are not interested in this pubkey v4");
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pubkeyPrivateKey = addr.getPubkeyPrivateKey();
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dataToDecrypt = objectPayload.slice(32);
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pubkeyp = bmcrypto
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.decrypt(pubkeyPrivateKey, dataToDecrypt)
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.then(function(decrypted) {
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// 4 + 64 + 64 + (1+) + (1+) + (1+)
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assert(
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decrypted.length >= 135,
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"Bad pubkey v4 object payload length");
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objectAssign(decoded, extractPubkeyV3(decrypted));
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siglen = util.popkey(decoded, "_siglen");
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dataToVerify = Buffer.concat([
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// Object header without nonce + tag.
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buf.slice(8, decoded.headerLength + 32),
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// Unencrypted pubkey data without signature.
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decrypted.slice(0, decoded.length - siglen),
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]);
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sig = decoded.signature;
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// Since data is encrypted, entire object payload is used.
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decoded.length = objectPayload.length;
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return bmcrypto.verify(decoded.signPublicKey, dataToVerify, sig);
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}).then(function() {
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return decoded;
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});
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resolve(pubkeyp);
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});
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},
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/**
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* Encode `pubkey` object message.
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* @param {Object} opts - `pubkey` object options
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* @param {number} opts.ttl - Time to live in seconds
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* @param {Address} opts.from - Originator of the message
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* @param {Address} opts.to - Receiver of the message
|
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* @param {boolean=} opts.skipPow - Do not compute POW (false by
|
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* default)
|
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* @return {Promise.<Buffer>} A promise that contains encoded message
|
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* when fulfilled.
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*/
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encodeAsync: function(opts) {
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return pubkey.encodePayloadAsync(opts).then(function(payload) {
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return message.encode("object", payload);
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});
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},
|
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|
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/**
|
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* Encode `pubkey` object message payload.
|
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* The same as [encodeAsync]{@link
|
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* module:bitmessage/objects.pubkey.encodeAsync}.
|
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*/
|
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encodePayloadAsync: function(opts) {
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return new PPromise(function(resolve) {
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opts = objectAssign({}, opts);
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opts.type = object.PUBKEY;
|
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// Originator of `pubkey` message.
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var from = Address.decode(opts.from);
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var nonceTrialsPerByte = util.getTrials(from);
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var payloadLengthExtraBytes = util.getExtraBytes(from);
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// Bitmessage address of recepient of `pubkey` message.
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var to, version, stream;
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if (opts.to) {
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to = Address.decode(opts.to);
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version = to.version;
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stream = to.stream;
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} else {
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version = opts.version || 4;
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stream = opts.stream || 1;
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}
|
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assert(version >= 2, "Address version is too low");
|
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assert(version <= 4, "Address version is too high");
|
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opts.version = version;
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opts.stream = stream;
|
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var obj, pubkeyp;
|
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|
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// v2 pubkey.
|
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if (version === 2) {
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opts.objectPayload = Buffer.concat([
|
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from.behavior.buffer,
|
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from.signPublicKey.slice(1),
|
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from.encPublicKey.slice(1),
|
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]);
|
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obj = object.encodePayloadWithoutNonce(opts);
|
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return resolve(prependNonce(obj, opts));
|
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}
|
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|
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var pubkeyData = [
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from.behavior.buffer,
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from.signPublicKey.slice(1),
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from.encPublicKey.slice(1),
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var_int.encode(nonceTrialsPerByte),
|
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var_int.encode(payloadLengthExtraBytes),
|
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];
|
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|
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// v3 pubkey.
|
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if (version === 3) {
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opts.objectPayload = Buffer.concat(pubkeyData);
|
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obj = object.encodePayloadWithoutNonce(opts);
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pubkeyp = bmcrypto
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.sign(from.signPrivateKey, obj)
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.then(function(sig) {
|
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// Append signature to the encoded object and we are done.
|
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obj = Buffer.concat([obj, var_int.encode(sig.length), sig]);
|
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return prependNonce(obj, opts);
|
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});
|
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return resolve(pubkeyp);
|
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}
|
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|
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// v4 pubkey.
|
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opts.objectPayload = from.getTag();
|
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obj = object.encodePayloadWithoutNonce(opts);
|
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var dataToSign = Buffer.concat([obj].concat(pubkeyData));
|
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pubkeyp = bmcrypto
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.sign(from.signPrivateKey, dataToSign)
|
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.then(function(sig) {
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var dataToEnc = pubkeyData.concat(var_int.encode(sig.length), sig);
|
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dataToEnc = Buffer.concat(dataToEnc);
|
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return bmcrypto.encrypt(from.getPubkeyPublicKey(), dataToEnc);
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}).then(function(enc) {
|
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// Concat object header with ecnrypted data and we are done.
|
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obj = Buffer.concat([obj, enc]);
|
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return prependNonce(obj, opts);
|
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});
|
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resolve(pubkeyp);
|
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});
|
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},
|
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};
|
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|
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// Try to decrypt message with all provided identities.
|
|
function tryDecryptMsg(identities, buf) {
|
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function inner(i) {
|
|
if (i > last) {
|
|
return PPromise.reject(
|
|
new Error("Failed to decrypt msg with given identities")
|
|
);
|
|
}
|
|
return bmcrypto
|
|
.decrypt(identities[i].encPrivateKey, buf)
|
|
.then(function(decrypted) {
|
|
return {addr: identities[i], decrypted: decrypted};
|
|
}).catch(function() {
|
|
return inner(i + 1);
|
|
});
|
|
}
|
|
|
|
if (Address.isAddress(identities)) {
|
|
identities = [identities];
|
|
}
|
|
var last = identities.length - 1;
|
|
return inner(0);
|
|
}
|
|
|
|
// Encode message from the given options.
|
|
function encodeMessage(opts) {
|
|
var encoding = opts.encoding || DEFAULT_ENCODING;
|
|
var message = opts.message;
|
|
var subject = opts.subject;
|
|
if (encoding === msg.IGNORE && !message) {
|
|
// User may omit message for IGNORE encoding.
|
|
message = Buffer.alloc(0);
|
|
} else if (!Buffer.isBuffer(message)) {
|
|
// User may specify message as a string.
|
|
message = Buffer.from(message, "utf8");
|
|
}
|
|
if (encoding === msg.SIMPLE && subject) {
|
|
// User may specify subject for SIMPLE encoding.
|
|
if (!Buffer.isBuffer(subject)) {
|
|
subject = Buffer.from(subject, "utf8");
|
|
}
|
|
message = Buffer.concat([
|
|
Buffer.from("Subject:"),
|
|
subject,
|
|
Buffer.from("\nBody:"),
|
|
message,
|
|
]);
|
|
}
|
|
return message;
|
|
}
|
|
|
|
// Decode message to the given encoding.
|
|
function decodeMessage(message, encoding) {
|
|
var decoded = {};
|
|
if (encoding === msg.TRIVIAL || encoding === msg.SIMPLE) {
|
|
message = message.toString("utf8");
|
|
}
|
|
if (encoding !== msg.SIMPLE) {
|
|
decoded.message = message;
|
|
return decoded;
|
|
}
|
|
|
|
// SIMPLE.
|
|
var subject, index;
|
|
if (message.slice(0, 8) === "Subject:") {
|
|
subject = message.slice(8);
|
|
index = subject.indexOf("\nBody:");
|
|
if (index !== -1) {
|
|
message = subject.slice(index + 6);
|
|
subject = subject.slice(0, index);
|
|
} else {
|
|
message = "";
|
|
}
|
|
decoded.subject = subject;
|
|
decoded.message = message;
|
|
} else {
|
|
decoded.subject = "";
|
|
decoded.message = message;
|
|
}
|
|
return decoded;
|
|
}
|
|
|
|
/**
|
|
* `msg` object.
|
|
* @see {@link https://pybitmessage.rtfd.io/en/v0.6/protocol.html#msg}
|
|
* @namespace
|
|
* @static
|
|
*/
|
|
var msg = exports.msg = {
|
|
/**
|
|
* Any data with this number may be ignored. The sending node might
|
|
* simply be sharing its public key with you.
|
|
* @constant {number}
|
|
*/
|
|
IGNORE: 0,
|
|
/**
|
|
* UTF-8. No 'Subject' or 'Body' sections. Useful for simple strings
|
|
* of data, like URIs or magnet links.
|
|
* @constant {number}
|
|
*/
|
|
TRIVIAL: 1,
|
|
/**
|
|
* UTF-8. Uses 'Subject' and 'Body' sections. No MIME is used.
|
|
* @constant {number}
|
|
*/
|
|
SIMPLE: 2,
|
|
|
|
/**
|
|
* @typedef {Object} DecodeResult
|
|
* @property {Buffer} nonce - A 8-byte object nonce
|
|
* @property {number} ttl - Time to live in seconds
|
|
* @property {Date} expires - Object expiration date
|
|
* @property {number} type - Object type
|
|
* @property {number} version - Object version
|
|
* @property {number} stream - Object stream
|
|
* @property {number} headerLength - Length of the object header
|
|
* @property {number} senderVersion - Sender's address version
|
|
* @property {number} senderStream - Sender's stream
|
|
* @property {Object} behavior - Sender's [pubkey features]{@link
|
|
* module:bitmessage/structs.PubkeyBitfield} that can be expected from
|
|
* the node
|
|
* @property {Buffer} signPublicKey - Sender's signing public key
|
|
* @property {Buffer} encPublicKey - Sender's encryption public key
|
|
* @property {number} nonceTrialsPerByte - Difficulty parameter of the
|
|
* sender (present only if sender's address version >= 3)
|
|
* @property {number} payloadLengthExtraBytes - Difficulty parameter
|
|
* of the sender (present only if sender's address version >= 3)
|
|
* @property {Buffer} ripe - The RIPEMD hash of the receiver's keys
|
|
* @property {number} encoding - Message encoding
|
|
* @property {(string|Buffer)} message - Message string for
|
|
* [TRIVIAL]{@link module:bitmessage/objects.msg.TRIVIAL} and
|
|
* [SIMPLE]{@link module:bitmessage/objects.msg.SIMPLE} encodings or
|
|
* unparsed buffer data for other encodings
|
|
* @property {string=} subject - Subject string for [SIMPLE]{@link
|
|
* module:bitmessage/objects.msg.SIMPLE} encoding
|
|
* @property {Buffer} ack - Message acknowledgement
|
|
* @property {Buffer} signature - Signature of the message
|
|
* @property {number} length - Real data length
|
|
* @memberof module:bitmessage/objects.msg
|
|
*/
|
|
|
|
/**
|
|
* Decode `msg` object message.
|
|
* @param {Buffer} buf - Message
|
|
* @param {Object} opts - Any of [object.decode]{@link
|
|
* module:bitmessage/structs.object.decode} options and:
|
|
* @param {(Address[]|Address)} opts.identities - Address objects used
|
|
* to decrypt the message
|
|
* @return {Promise.<DecodeResult>} A promise that contains [decoded
|
|
* `msg` structure]{@link module:bitmessage/objects.msg.DecodeResult}
|
|
* when fulfilled.
|
|
*/
|
|
decodeAsync: function(buf, opts) {
|
|
return new PPromise(function(resolve) {
|
|
var decoded = message.decode(buf);
|
|
assert(decoded.command === "object", "Bad command");
|
|
resolve(msg.decodePayloadAsync(decoded.payload, opts));
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Decode `msg` object message payload.
|
|
* The same as [decodeAsync]{@link
|
|
* module:bitmessage/objects.msg.decodeAsync}.
|
|
*/
|
|
decodePayloadAsync: function(buf, opts) {
|
|
return new PPromise(function(resolve) {
|
|
var decoded = object.decodePayload(buf, opts);
|
|
assert(decoded.type === object.MSG, "Bad object type");
|
|
assert(decoded.version === 1, "Bad msg version");
|
|
var objectPayload = util.popkey(decoded, "objectPayload");
|
|
|
|
var msgp = tryDecryptMsg(opts.identities, objectPayload)
|
|
.then(function(decInfo) {
|
|
var decrypted = decInfo.decrypted;
|
|
|
|
// Version, stream.
|
|
var decodedVersion = var_int.decode(decrypted);
|
|
var senderVersion = decoded.senderVersion = decodedVersion.value;
|
|
assert(senderVersion >= 2, "Sender version is too low");
|
|
assert(senderVersion <= 4, "Sender version is too high");
|
|
var decodedStream = var_int.decode(decodedVersion.rest);
|
|
decoded.senderStream = decodedStream.value;
|
|
|
|
// Behavior, keys.
|
|
assert(
|
|
decodedStream.rest.length >= 132,
|
|
"Bad msg object payload length");
|
|
objectAssign(decoded, extractPubkey(decodedStream.rest));
|
|
decoded.length += decodedVersion.length + decodedStream.length;
|
|
var rest = decrypted.slice(decoded.length);
|
|
|
|
// Pow extra.
|
|
if (senderVersion >= 3) {
|
|
var decodedTrials = var_int.decode(rest);
|
|
decoded.nonceTrialsPerByte = decodedTrials.value;
|
|
decoded.length += decodedTrials.length;
|
|
var decodedExtraBytes = var_int.decode(decodedTrials.rest);
|
|
decoded.payloadLengthExtraBytes = decodedExtraBytes.value;
|
|
decoded.length += decodedExtraBytes.length;
|
|
rest = decodedExtraBytes.rest;
|
|
}
|
|
|
|
// Ripe, encoding.
|
|
assert(rest.length >= 20, "Bad msg object payload length");
|
|
decoded.ripe = rest.slice(0, 20);
|
|
// TODO(Kagami): Also check against the calculated ripe (see
|
|
// GH-6)?
|
|
assert(
|
|
bufferEqual(decoded.ripe, decInfo.addr.ripe),
|
|
"msg was decrypted but the destination ripe doesn't match");
|
|
decoded.length += 20;
|
|
var decodedEncoding = var_int.decode(rest.slice(20));
|
|
var encoding = decoded.encoding = decodedEncoding.value;
|
|
decoded.length += decodedEncoding.length;
|
|
|
|
// Message.
|
|
var decodedMsgLength = var_int.decode(decodedEncoding.rest);
|
|
var msglen = decodedMsgLength.value;
|
|
rest = decodedMsgLength.rest;
|
|
assert(rest.length >= msglen, "Bad msg object payload length");
|
|
decoded.length += decodedMsgLength.length + msglen;
|
|
var message = rest.slice(0, msglen);
|
|
objectAssign(decoded, decodeMessage(message, encoding));
|
|
|
|
// Acknowledgement data.
|
|
// TODO(Kagami): Validate ack, check a POW.
|
|
var decodedAckLength = var_int.decode(rest.slice(msglen));
|
|
var acklen = decodedAckLength.value;
|
|
rest = decodedAckLength.rest;
|
|
assert(rest.length >= acklen, "Bad msg object payload length");
|
|
decoded.length += decodedAckLength.length + acklen;
|
|
decoded.ack = rest.slice(0, acklen);
|
|
|
|
// Signature.
|
|
var decodedSigLength = var_int.decode(rest.slice(acklen));
|
|
var siglen = decodedSigLength.value;
|
|
rest = decodedSigLength.rest;
|
|
assert(rest.length >= siglen, "Bad msg object payload length");
|
|
var sig = decoded.signature = rest.slice(0, siglen);
|
|
|
|
// Verify signature.
|
|
var dataToVerify = Buffer.concat([
|
|
// Object header without nonce.
|
|
buf.slice(8, decoded.headerLength),
|
|
// Unencrypted pubkey data without signature.
|
|
decrypted.slice(0, decoded.length),
|
|
]);
|
|
// Since data is encrypted, entire object payload is used.
|
|
decoded.length = objectPayload.length;
|
|
return bmcrypto.verify(decoded.signPublicKey, dataToVerify, sig);
|
|
}).then(function() {
|
|
return decoded;
|
|
});
|
|
resolve(msgp);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Encode `msg` object message.
|
|
* @param {Object} opts - `msg` object options
|
|
* @param {number} opts.ttl - Time to live in seconds
|
|
* @param {Address} opts.from - Originator of the message
|
|
* @param {Address} opts.to - Receiver of the message
|
|
* @param {(string|Buffer)} opts.message - Message
|
|
* @param {(string|Buffer)=} opts.subject - Subject for [SIMPLE]{@link
|
|
* module:bitmessage/objects.msg.SIMPLE} encoding
|
|
* @param {number=} opts.encoding - Encoding of the message
|
|
* ([TRIVIAL]{@link module:bitmessage/objects.msg.TRIVIAL} by default)
|
|
* @param {boolean=} opts.friend - Whether the receiver is friend and
|
|
* should have minimal POW difficulty (false by default)
|
|
* @param {boolean=} opts.skipPow - Do not compute POW (false by
|
|
* default)
|
|
* @return {Promise.<Buffer>} A promise that contains encoded message
|
|
* when fulfilled.
|
|
*/
|
|
encodeAsync: function(opts) {
|
|
return msg.encodePayloadAsync(opts).then(function(payload) {
|
|
return message.encode("object", payload);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Encode `msg` object message payload.
|
|
* The same as [encodeAsync]{@link
|
|
* module:bitmessage/objects.msg.encodeAsync}.
|
|
*/
|
|
encodePayloadAsync: function(opts) {
|
|
return new PPromise(function(resolve) {
|
|
// Deal with options.
|
|
opts = objectAssign({}, opts);
|
|
opts.type = object.MSG;
|
|
opts.version = 1; // The only known msg version
|
|
var from = Address.decode(opts.from);
|
|
assert(from.version >= 2, "Address version is too low");
|
|
assert(from.version <= 4, "Address version is too high");
|
|
var to = Address.decode(opts.to);
|
|
opts.stream = to.stream;
|
|
var nonceTrialsPerByte, payloadLengthExtraBytes;
|
|
if (from.version >= 3) {
|
|
if (opts.friend) {
|
|
nonceTrialsPerByte = util.DEFAULT_TRIALS_PER_BYTE;
|
|
payloadLengthExtraBytes = util.DEFAULT_EXTRA_BYTES;
|
|
} else {
|
|
nonceTrialsPerByte = util.getTrials(from);
|
|
payloadLengthExtraBytes = util.getExtraBytes(from);
|
|
}
|
|
}
|
|
var encoding = opts.encoding || DEFAULT_ENCODING;
|
|
var message = encodeMessage(opts);
|
|
|
|
// Assemble the unencrypted message data.
|
|
var msgData = [
|
|
var_int.encode(from.version),
|
|
var_int.encode(from.stream),
|
|
from.behavior.buffer,
|
|
from.signPublicKey.slice(1),
|
|
from.encPublicKey.slice(1),
|
|
];
|
|
if (from.version >= 3) {
|
|
msgData.push(
|
|
var_int.encode(nonceTrialsPerByte),
|
|
var_int.encode(payloadLengthExtraBytes)
|
|
);
|
|
}
|
|
msgData.push(
|
|
to.ripe,
|
|
var_int.encode(encoding),
|
|
var_int.encode(message.length),
|
|
message
|
|
);
|
|
// TODO(Kagami): Calculate ACK.
|
|
msgData.push(var_int.encode(0));
|
|
|
|
// Sign and encrypt.
|
|
opts.objectPayload = Buffer.alloc(0);
|
|
var obj = object.encodePayloadWithoutNonce(opts);
|
|
var dataToSign = Buffer.concat([obj].concat(msgData));
|
|
var msgp = bmcrypto
|
|
.sign(from.signPrivateKey, dataToSign)
|
|
.then(function(sig) {
|
|
var dataToEnc = msgData.concat(var_int.encode(sig.length), sig);
|
|
dataToEnc = Buffer.concat(dataToEnc);
|
|
return bmcrypto.encrypt(to.encPublicKey, dataToEnc);
|
|
}).then(function(enc) {
|
|
// Concat object header with ecnrypted data and we are done.
|
|
obj = Buffer.concat([obj, enc]);
|
|
// TODO(Kagami): Merge receiver's trials/extra bytes options
|
|
// so we can calculate right POW (now we need to pass them to
|
|
// opts manually).
|
|
return prependNonce(obj, opts);
|
|
});
|
|
resolve(msgp);
|
|
});
|
|
},
|
|
};
|
|
|
|
var DEFAULT_ENCODING = msg.TRIVIAL;
|
|
|
|
// Try to decrypt broadcast v4 with all provided subscription objects.
|
|
function tryDecryptBroadcastV4(subscriptions, buf) {
|
|
function inner(i) {
|
|
if (i > last) {
|
|
return PPromise.reject(
|
|
new Error("Failed to decrypt broadcast with given identities")
|
|
);
|
|
}
|
|
return bmcrypto
|
|
.decrypt(subscriptions[i].getBroadcastPrivateKey(), buf)
|
|
.then(function(decrypted) {
|
|
return {addr: subscriptions[i], decrypted: decrypted};
|
|
}).catch(function() {
|
|
return inner(i + 1);
|
|
});
|
|
}
|
|
|
|
if (Address.isAddress(subscriptions)) {
|
|
subscriptions = [subscriptions];
|
|
} else if (!Array.isArray(subscriptions)) {
|
|
subscriptions = Object.keys(subscriptions).map(function(k) {
|
|
return subscriptions[k];
|
|
});
|
|
}
|
|
// Only addresses with version < 4 may be used to encode broadcast v4.
|
|
subscriptions = subscriptions.filter(function(a) {
|
|
return a.version < 4;
|
|
});
|
|
var last = subscriptions.length - 1;
|
|
return inner(0);
|
|
}
|
|
|
|
/**
|
|
* `broadcast` object.
|
|
* @see {@link https://pybitmessage.rtfd.io/en/v0.6/protocol.html#broadcast}
|
|
* @namespace
|
|
* @static
|
|
*/
|
|
var broadcast = exports.broadcast = {
|
|
/**
|
|
* @typedef {Object} DecodeResult
|
|
* @property {Buffer} nonce - A 8-byte object nonce
|
|
* @property {number} ttl - Time to live in seconds
|
|
* @property {Date} expires - Object expiration date
|
|
* @property {number} type - Object type
|
|
* @property {number} version - Object version
|
|
* @property {number} stream - Object stream
|
|
* @property {number} headerLength - Length of the object header
|
|
* @property {Buffer} tag - Tag derived from the address object used
|
|
* to send this `broadcast` (present only for object version >= 5)
|
|
* @property {number} senderVersion - Sender's address version
|
|
* @property {number} senderStream - Sender's stream
|
|
* @property {Object} behavior - Sender's [pubkey features]{@link
|
|
* module:bitmessage/structs.PubkeyBitfield} that can be expected from
|
|
* the node
|
|
* @property {Buffer} signPublicKey - Sender's signing public key
|
|
* @property {Buffer} encPublicKey - Sender's encryption public key
|
|
* @property {number} nonceTrialsPerByte - Difficulty parameter of the
|
|
* sender (present only if sender's address version >= 3)
|
|
* @property {number} payloadLengthExtraBytes - Difficulty parameter
|
|
* of the sender (present only if sender's address version >= 3)
|
|
* @property {number} encoding - Message encoding
|
|
* @property {(string|Buffer)} message - Message string for
|
|
* [TRIVIAL]{@link module:bitmessage/objects.msg.TRIVIAL} and
|
|
* [SIMPLE]{@link module:bitmessage/objects.msg.SIMPLE} encodings or
|
|
* unparsed buffer data for other encodings
|
|
* @property {string=} subject - Subject string for [SIMPLE]{@link
|
|
* module:bitmessage/objects.msg.SIMPLE} encoding
|
|
* @property {Buffer} signature - Signature of the message
|
|
* @property {number} length - Real data length
|
|
* @memberof module:bitmessage/objects.broadcast
|
|
*/
|
|
|
|
/**
|
|
* Decode `broadcast` object message.
|
|
* @param {Buffer} buf - Message
|
|
* @param {Object} opts - Any of [object.decode]{@link
|
|
* module:bitmessage/structs.object.decode} options and:
|
|
* @param {(Address[]|Address|Object)} opts.subscriptions - Address
|
|
* objects which represent broadcast subscriptions. It is either
|
|
* addresses array or single address or Object
|
|
* addr-by-tag/addr-by-ripe. Time to match the key is O(n), O(1), O(1)
|
|
* respectfully.
|
|
* @return {Promise.<DecodeResult>} A promise that contains
|
|
* [decoded `broadcast` structure]{@link
|
|
* module:bitmessage/objects.broadcast.DecodeResult} when fulfilled.
|
|
*/
|
|
decodeAsync: function(buf, opts) {
|
|
return new PPromise(function(resolve) {
|
|
var decoded = message.decode(buf);
|
|
assert(decoded.command === "object", "Bad command");
|
|
resolve(broadcast.decodePayloadAsync(decoded.payload, opts));
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Decode `broadcast` object message payload.
|
|
* The same as [decodeAsync]{@link
|
|
* module:bitmessage/objects.broadcast.decodeAsync}.
|
|
*/
|
|
decodePayloadAsync: function(buf, opts) {
|
|
return new PPromise(function(resolve) {
|
|
var decoded = object.decodePayload(buf, opts);
|
|
assert(decoded.type === object.BROADCAST, "Bad object type");
|
|
var version = decoded.version;
|
|
assert(version === 4 || version === 5, "Bad broadcast version");
|
|
var objectPayload = util.popkey(decoded, "objectPayload");
|
|
var tag, addr, broadPrivateKey, dataToDecrypt, broadp;
|
|
|
|
if (version === 4) {
|
|
broadp = tryDecryptBroadcastV4(opts.subscriptions, objectPayload);
|
|
} else {
|
|
assert(
|
|
objectPayload.length >= 32,
|
|
"Bad broadcast v5 object payload length");
|
|
tag = decoded.tag = objectPayload.slice(0, 32);
|
|
addr = findAddrByTag(opts.subscriptions, tag);
|
|
assert(addr, "You are not interested in this broadcast v5");
|
|
broadPrivateKey = addr.getBroadcastPrivateKey();
|
|
dataToDecrypt = objectPayload.slice(32);
|
|
broadp = bmcrypto
|
|
.decrypt(broadPrivateKey, dataToDecrypt)
|
|
.then(function(decrypted) {
|
|
return {addr: addr, decrypted: decrypted};
|
|
});
|
|
}
|
|
|
|
broadp = broadp.then(function(decInfo) {
|
|
var decrypted = decInfo.decrypted;
|
|
|
|
// Version, stream.
|
|
var decodedVersion = var_int.decode(decrypted);
|
|
var senderVersion = decoded.senderVersion = decodedVersion.value;
|
|
if (version === 4) {
|
|
assert(senderVersion >= 2, "Sender version is too low");
|
|
assert(senderVersion <= 3, "Sender version is too high");
|
|
} else {
|
|
assert(senderVersion === 4, "Bad sender version");
|
|
}
|
|
var decodedStream = var_int.decode(decodedVersion.rest);
|
|
var senderStream = decoded.senderStream = decodedStream.value;
|
|
assert(
|
|
senderStream === decoded.stream,
|
|
"Cleartext broadcast object stream doesn't match encrypted");
|
|
|
|
// Behavior, keys.
|
|
assert(
|
|
decodedStream.rest.length >= 132,
|
|
"Bad broadcast object payload length");
|
|
objectAssign(decoded, extractPubkey(decodedStream.rest));
|
|
decoded.length += decodedVersion.length + decodedStream.length;
|
|
var rest = decrypted.slice(decoded.length);
|
|
var sender = new Address({
|
|
version: senderVersion,
|
|
stream: senderStream,
|
|
signPublicKey: decoded.signPublicKey,
|
|
encPublicKey: decoded.encPublicKey,
|
|
});
|
|
if (version === 4) {
|
|
assert(
|
|
bufferEqual(sender.ripe, decInfo.addr.ripe),
|
|
"The keys used to encrypt the broadcast doesn't match the keys "+
|
|
"embedded into the object");
|
|
} else {
|
|
assert(
|
|
bufferEqual(sender.getTag(), tag),
|
|
"The tag used to encrypt the broadcast doesn't match the keys "+
|
|
"and version/stream embedded into the object");
|
|
}
|
|
|
|
// Pow extra.
|
|
if (senderVersion >= 3) {
|
|
var decodedTrials = var_int.decode(rest);
|
|
decoded.nonceTrialsPerByte = decodedTrials.value;
|
|
decoded.length += decodedTrials.length;
|
|
var decodedExtraBytes = var_int.decode(decodedTrials.rest);
|
|
decoded.payloadLengthExtraBytes = decodedExtraBytes.value;
|
|
decoded.length += decodedExtraBytes.length;
|
|
rest = decodedExtraBytes.rest;
|
|
}
|
|
|
|
// Encoding, message
|
|
var decodedEncoding = var_int.decode(rest);
|
|
var encoding = decoded.encoding = decodedEncoding.value;
|
|
decoded.length += decodedEncoding.length;
|
|
var decodedMsgLength = var_int.decode(decodedEncoding.rest);
|
|
var msglen = decodedMsgLength.value;
|
|
rest = decodedMsgLength.rest;
|
|
assert(rest.length >= msglen, "Bad broadcast object payload length");
|
|
decoded.length += decodedMsgLength.length + msglen;
|
|
var message = rest.slice(0, msglen);
|
|
objectAssign(decoded, decodeMessage(message, encoding));
|
|
|
|
// Signature.
|
|
var decodedSigLength = var_int.decode(rest.slice(msglen));
|
|
var siglen = decodedSigLength.value;
|
|
rest = decodedSigLength.rest;
|
|
assert(rest.length >= siglen, "Bad broadcast object payload length");
|
|
var sig = decoded.signature = rest.slice(0, siglen);
|
|
|
|
// Verify signature.
|
|
var headerLength = decoded.headerLength;
|
|
if (version !== 4) {
|
|
// Compensate for tag.
|
|
headerLength += 32;
|
|
}
|
|
var dataToVerify = Buffer.concat([
|
|
// Object header without nonce.
|
|
buf.slice(8, headerLength),
|
|
// Unencrypted pubkey data without signature.
|
|
decrypted.slice(0, decoded.length),
|
|
]);
|
|
// Since data is encrypted, entire object payload is used.
|
|
decoded.length = objectPayload.length;
|
|
return bmcrypto.verify(decoded.signPublicKey, dataToVerify, sig);
|
|
}).then(function() {
|
|
return decoded;
|
|
});
|
|
resolve(broadp);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Encode `broadcast` object message.
|
|
* @param {Object} opts - `broadcast` object options
|
|
* @param {number} opts.ttl - Time to live in seconds
|
|
* @param {Address} opts.from - Originator of the message
|
|
* @param {(string|Buffer)} opts.message - Message
|
|
* @param {(string|Buffer)=} opts.subject - Subject for [SIMPLE]{@link
|
|
* module:bitmessage/objects.msg.SIMPLE} encoding
|
|
* @param {number=} opts.encoding - Encoding of the message
|
|
* ([TRIVIAL]{@link module:bitmessage/objects.msg.TRIVIAL} by default)
|
|
* @param {boolean=} opts.skipPow - Do not compute POW (false by
|
|
* default)
|
|
* @return {Promise.<Buffer>} A promise that contains encoded message
|
|
* when fulfilled.
|
|
*/
|
|
encodeAsync: function(opts) {
|
|
return broadcast.encodePayloadAsync(opts).then(function(payload) {
|
|
return message.encode("object", payload);
|
|
});
|
|
},
|
|
|
|
/**
|
|
* Encode `broadcast` object message payload.
|
|
* The same as [encodeAsync]{@link
|
|
* module:bitmessage/objects.broadcast.encodeAsync}.
|
|
*/
|
|
encodePayloadAsync: function(opts) {
|
|
return new PPromise(function(resolve) {
|
|
// Deal with options.
|
|
opts = objectAssign({}, opts);
|
|
opts.type = object.BROADCAST;
|
|
var from = Address.decode(opts.from);
|
|
assert(from.version >= 2, "Address version is too low");
|
|
assert(from.version <= 4, "Address version is too high");
|
|
opts.version = from.version >= 4 ? 5 : 4;
|
|
opts.stream = from.stream;
|
|
var encoding = opts.encoding || DEFAULT_ENCODING;
|
|
var message = encodeMessage(opts);
|
|
|
|
// Assemble the unencrypted message data.
|
|
var broadData = [
|
|
var_int.encode(from.version),
|
|
var_int.encode(from.stream),
|
|
from.behavior.buffer,
|
|
from.signPublicKey.slice(1),
|
|
from.encPublicKey.slice(1),
|
|
];
|
|
if (from.version >= 3) {
|
|
broadData.push(
|
|
var_int.encode(util.getTrials(from)),
|
|
var_int.encode(util.getExtraBytes(from))
|
|
);
|
|
}
|
|
broadData.push(
|
|
var_int.encode(encoding),
|
|
var_int.encode(message.length),
|
|
message
|
|
);
|
|
|
|
// Sign and encrypt.
|
|
opts.objectPayload = from.version >= 4 ? from.getTag() : Buffer.alloc(0);
|
|
var obj = object.encodePayloadWithoutNonce(opts);
|
|
var dataToSign = Buffer.concat([obj].concat(broadData));
|
|
var broadp = bmcrypto
|
|
.sign(from.signPrivateKey, dataToSign)
|
|
.then(function(sig) {
|
|
var dataToEnc = broadData.concat(var_int.encode(sig.length), sig);
|
|
dataToEnc = Buffer.concat(dataToEnc);
|
|
return bmcrypto.encrypt(from.getBroadcastPublicKey(), dataToEnc);
|
|
}).then(function(enc) {
|
|
obj = Buffer.concat([obj, enc]);
|
|
return prependNonce(obj, opts);
|
|
});
|
|
resolve(broadp);
|
|
});
|
|
},
|
|
};
|