Bitmessage
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bitmessage-js
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objects module improvements/refactoring

This commit is contained in:
Kagami Hiiragi 2015-01-29 16:23:18 +03:00
parent 2416094686
commit 34868ff014
3 changed files with 109 additions and 86 deletions
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24
lib/address.js
View File

@ -98,36 +98,42 @@ Address.prototype.getShortRipe = function() {
return ripe.slice(20 - getripelen(ripe));
};
function getdoublehash(addr) {
function getaddrhash(addr) {
var dataToHash = Buffer.concat([
var_int.encode(addr.version),
var_int.encode(addr.stream),
addr.ripe,
]);
return bmcrypto.sha512(bmcrypto.sha512(dataToHash));
return bmcrypto.sha512(dataToHash);
}
/**
* Calculate the encryption key used to encrypt/decrypt {@link pubkey}
* and {@link broadcast} objects.
* objects.
* @return {Buffer} A 32-byte private key.
* @static
*/
var getPubkeyPrivateKey = Address.prototype.getPubkeyPrivateKey = function() {
return getdoublehash(this).slice(0, 32);
Address.prototype.getPubkeyPrivateKey = function() {
return bmcrypto.sha512(getaddrhash(this)).slice(0, 32);
};
/**
* Just an alias to {@link Address#getPubkeyPrivateKey} for convinience.
* Calculate the encryption key used to encrypt/decrypt
* {@link broadcast} objects.
*/
Address.prototype.getBroadcastPrivateKey = getPubkeyPrivateKey;
Address.prototype.getBroadcastPrivateKey = function() {
if (this.version >= 4) {
return bmcrypto.sha512(getaddrhash(this)).slice(0, 32);
} else {
return getaddrhash(this).slice(0, 32);
}
};
/**
* Calculate the address tag.
* @return {Buffer} A 32-byte address tag.
*/
Address.prototype.getTag = function() {
return getdoublehash(this).slice(32);
return bmcrypto.sha512(getaddrhash(this)).slice(32);
};

162
lib/objects.js
View File

@ -6,7 +6,7 @@
* @module bitmessage/objects
*/
// TODO(Kagami): Document object-like params.
// FIXME(Kagami): Think through API, we may want to get decoded
// FIXME(Kagami): Think through the API, we may want to get decoded
// structure even if it contains unsupported version. Also error
// handling may need some refactoring.
@ -183,6 +183,29 @@ function extractPubkeyV3(buf) {
return decoded;
}
function findPubkeyPrivateKey(neededPubkeys, tag) {
// `neededPubkeys` is either single address or addresses array or
// Object key-by-tag. Time to match the tag is O(1), O(n), O(1)
// respectfully.
neededPubkeys = neededPubkeys || {};
var addr, addrs, i;
if (Address.isAddress(neededPubkeys)) {
addr = neededPubkeys;
if (bufferEqual(addr.getTag(), tag)) {
return addr.getPubkeyPrivateKey();
}
} else if (Array.isArray(neededPubkeys)) {
addrs = neededPubkeys;
for (i = 0; i < addrs.length; i++) {
if (bufferEqual(addrs[i].getTag(), tag)) {
return addrs[i].getPubkeyPrivateKey();
}
}
} else {
return neededPubkeys[tag];
}
}
/**
* `pubkey` object.
* @see {@link https://bitmessage.org/wiki/Protocol_specification#pubkey}
@ -205,18 +228,15 @@ var pubkey = exports.pubkey = {
});
},
/**
* Options for decoding pubkey
* @typedef {Object} PubkeyDecodeOpts
* @property {?(Address[]|Address|Object)} needed - Address objects
* which represent pubkeys that we are interested in; this is used
* only for pubkeys v4
*/
/**
* Decode `pubkey` object message payload.
* @param {Buffer} buf - Message payload
* @param {?PubkeyDecodeOpts} opts - Decoding options
* @param {?Object} opts - Decoding options
* @param {?(Address[]|Address|Object)} opts.needed - Address objects
* which represent pubkeys that we are interested in. This is used
* only for pubkeys v4. `needed` is either single address or addresses
* array or Object key-by-tag. Time to match the tag is O(1), O(n),
* O(1) respectfully.
* @return {Promise.<Object>} A promise that contains decoded `pubkey`
* object structure when fulfilled.
*/
@ -230,7 +250,7 @@ var pubkey = exports.pubkey = {
assert(version <= 4, "Address version is too high");
var objectPayload = util.popkey(decoded, "objectPayload");
var siglen, pos, sig, dataToVerify, pubkeyp;
var addr, addrs, tag, pubkeyEncPrivateKey, dataToDecrypt;
var tag, pubkeyPrivateKey, dataToDecrypt;
// v2 pubkey.
if (version === 2) {
@ -262,30 +282,13 @@ var pubkey = exports.pubkey = {
}
// v4 pubkey.
// `neededPubkeys` is either single address or addresses array or
// Object key-by-tag. Time to match the tag is O(1), O(n), O(1)
// respectfully.
var neededPubkeys = opts.needed || {};
if (Address.isAddress(neededPubkeys)) {
addr = neededPubkeys;
neededPubkeys = {};
neededPubkeys[addr.getTag()] = addr.getPubkeyPrivateKey();
} else if (Array.isArray(neededPubkeys)) {
addrs = neededPubkeys;
neededPubkeys = {};
addrs.forEach(function(a) {
neededPubkeys[a.getTag()] = a.getPubkeyPrivateKey();
});
}
assert(objectPayload.length >= 32, "Bad pubkey v4 object payload length");
tag = decoded.tag = objectPayload.slice(0, 32);
pubkeyEncPrivateKey = neededPubkeys[tag];
assert(pubkeyEncPrivateKey, "You are not interested in this pubkey v4");
pubkeyPrivateKey = findPubkeyPrivateKey(opts.needed, tag);
assert(pubkeyPrivateKey, "You are not interested in this pubkey v4");
dataToDecrypt = objectPayload.slice(32);
pubkeyp = bmcrypto
.decrypt(pubkeyEncPrivateKey, dataToDecrypt)
.decrypt(pubkeyPrivateKey, dataToDecrypt)
.then(function(decrypted) {
// 4 + 64 + 64 + (1+) + (1+) + (1+)
assert(
@ -419,7 +422,7 @@ var pubkey = exports.pubkey = {
};
// Try to decrypt message with all provided identities.
function tryDecrypt(identities, buf) {
function tryDecryptMsg(identities, buf) {
function inner(i) {
if (i > last) {
return promise.reject("Failed to decrypt msg with given identities");
@ -437,10 +440,45 @@ function tryDecrypt(identities, buf) {
return inner(0);
}
// Loosely decode message in SIMPLE encoding.
function decodeSimple(buf) {
// 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 = new Buffer(0);
} else if (!Buffer.isBuffer(message)) {
// User may specify message as a string.
message = new Buffer(message, "utf8");
}
if (encoding === msg.SIMPLE && subject) {
// User may specify subject for SIMPLE encoding.
if (!Buffer.isBuffer(subject)) {
subject = new Buffer(subject, "utf8");
}
message = Buffer.concat([
new Buffer("Subject:"),
subject,
new Buffer("\nBody:"),
message,
]);
}
return message;
}
// Decode message to the given encoding.
function decodeMessage(message, encoding) {
var decoded = {};
var message = buf.toString("utf8");
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);
@ -497,17 +535,12 @@ var msg = exports.msg = {
});
},
/**
* Options for decoding pubkey
* @typedef {Object} MsgDecodeOpts
* @property {(Address[]|Address)} identities - Our identities used to
* decrypt the message
*/
/**
* Decode `msg` object message payload.
* @param {Buffer} buf - Message payload
* @param {MsgDecodeOpts} opts - Decoding options
* @param {Object} opts - Decoding options
* @param {(Address[]|Address)} opts.identities - Address objects used
* to decrypt the message
* @return {Promise.<Object>} A promise that contains decoded `msg`
* object structure when fulfilled.
*/
@ -518,11 +551,11 @@ var msg = exports.msg = {
identities = [identities];
}
var decoded = object.decodePayload(buf);
assert(decoded.type === object.MSG, "Wrong object type");
assert(decoded.version === 1, "Wrong msg version");
assert(decoded.type === object.MSG, "Bad object type");
assert(decoded.version === 1, "Bad msg version");
var objectPayload = util.popkey(decoded, "objectPayload");
var msgp = tryDecrypt(identities, objectPayload)
var msgp = tryDecryptMsg(identities, objectPayload)
.then(function(decInfo) {
var decrypted = decInfo.decrypted;
@ -570,13 +603,7 @@ var msg = exports.msg = {
assert(rest.length >= msglen, "Bad msg object payload length");
decoded.length += decodedMsgLength.length + msglen;
var message = rest.slice(0, msglen);
if (encoding === msg.TRIVIAL) {
decoded.message = message.toString("utf8");
} else if (encoding === msg.SIMPLE) {
objectAssign(decoded, decodeSimple(message));
} else {
decoded.message = message;
}
objectAssign(decoded, decodeMessage(message, encoding));
// Acknowledgement data.
// TODO(Kagami): Validate ack, check a POW.
@ -649,30 +676,10 @@ var msg = exports.msg = {
payloadLengthExtraBytes = util.getExtraBytes(from);
}
}
var encoding = opts.encoding || msg.TRIVIAL;
var message = opts.message;
var subject = opts.subject;
if (encoding === msg.IGNORE && !message) {
// User may omit message for IGNORE encoding.
message = new Buffer(0);
} else if (!Buffer.isBuffer(message)) {
// User may specify message as a string.
message = new Buffer(message, "utf8");
}
if (encoding === msg.SIMPLE && subject) {
// User may specify subject for SIMPLE encoding.
if (!Buffer.isBuffer(subject)) {
subject = new Buffer(subject, "utf8");
}
message = Buffer.concat([
new Buffer("Subject:"),
subject,
new Buffer("\nBody:"),
message,
]);
}
var encoding = opts.encoding || DEFAULT_ENCODING;
var message = encodeMessage(opts);
// Assembling the unencrypted message data.
// Assemble the unencrypted message data.
var msgData = [
var_int.encode(from.version),
var_int.encode(from.stream),
@ -695,6 +702,7 @@ var msg = exports.msg = {
// TODO(Kagami): Calculate ACK.
msgData.push(var_int.encode(0));
// Sign and encrypt.
opts.objectPayload = new Buffer(0);
var obj = object.encodePayloadWithoutNonce(opts);
var dataToSign = Buffer.concat([obj].concat(msgData));
@ -714,3 +722,5 @@ var msg = exports.msg = {
});
},
};
var DEFAULT_ENCODING = msg.TRIVIAL;

9
test.js
View File

@ -830,8 +830,15 @@ describe("High-level classes", function() {
expect(addr.getPubkeyPrivateKey().toString("hex")).to.equal("15e516173769dc87d4a8e8ed90200362fa58c0228bb2b70b06f26c089a9823a4");
});
it("should calculate a private key to encrypt broadcast object", function() {
it("should calculate a private key to encrypt broadcast v4", function() {
var addr = Address.decode(" 2D8Jxw5yiepaQqxrx43iPPNfRqbvWoJLoU ");
expect(addr.version).to.equal(3);
expect(addr.getBroadcastPrivateKey().toString("hex")).to.equal("664420eaed1b6b3208fc04905c2f6ca758594c537eb5a08f2f0c2bbe6f07fb44");
});
it("should calculate a private key to encrypt broadcast v5", function() {
var addr = Address.decode("BM-2cTux3PGRqHTEH6wyUP2sWeT4LrsGgy63z");
expect(addr.version).to.equal(4);
expect(addr.getBroadcastPrivateKey().toString("hex")).to.equal("15e516173769dc87d4a8e8ed90200362fa58c0228bb2b70b06f26c089a9823a4");
});