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index.js
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index.js
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const DeviceHandshake = require('./lib/handshake')
const messages = require('./messages.js')
const XOR = require('./lib/xor')
const SMC = require('simple-message-channels')
const crypto = require('@ddatabase/crypto')
const varint = require('varint')
module.exports = class SimpleIdentityExchangeProtocol {
constructor (initiator, handlers) {
const payload = {
nonce: XOR.nonce()
}
this.handlers = handlers || {}
this.remotePayload = null
this.remotePublicKey = null
this.publicKey = null
this.handshakeHash = null
this.destroyed = false
this._initiator = initiator
this._payload = payload
this._pending = []
this._handshake = null
this._split = null
this._encryption = null
this._noise = !(handlers.encrypted === false && handlers.noise === false)
this._buffering = null
this._handshaking = false
this._messages = new SMC({
onmessage,
onmissing,
context: this,
types: [
{ context: this, onmessage: onopen, encoding: messages.Open },
{ context: this, onmessage: onverify, encoding: messages.Verify },
{ context: this, onmessage: onproof, encoding: messages.Prove },
{ context: this, onmessage: onreleaseseed, encoding: messages.ReleaseSeed },
{ context: this, onmessage: onwantkey, encoding: messages.WantKey },
{ context: this, onmessage: onprovidekey, encoding: messages.ProvideKey },
{ context: this, onmessage: onclose, encoding: messages.Close }
]
})
if (handlers.encrypted !== false || handlers.noise !== false) {
this._handshaking = true
if (typeof this.handlers.keyPair !== 'function') {
this._onkeypair(null, this.handlers.keyPair || null)
} else {
this._buffering = []
this.handlers.keyPair(this._onkeypair.bind(this))
}
}
}
_onkeypair (err, keyPair) {
if (err) return this.destroy(err)
if (this._handshake !== null) return
this.handlers.keyPair = keyPair
const handshake = new DeviceHandshake(
this._initiator,
messages.NoisePayload.encode(this._payload),
this.handlers,
this._onhandshake.bind(this)
)
this.publicKey = handshake.keyPair.publicKey
this._handshake = handshake
if (this._buffering) {
while (this._buffering.length) this._recv(this._buffering.shift())
}
this._buffering = null
}
open (ch, message) {
return this._send(ch, 0, message)
}
verify (ch, message) {
return this._send(ch, 1, message)
}
prove (ch, message) {
return this._send(ch, 2, message)
}
releaseseed (ch, message) {
return this._send(ch, 3, message)
}
wantKey (ch, message) {
return this._send(ch, 4, message)
}
provideKey (ch, message) {
return this._send(ch, 5, message)
}
close (ch, message) {
return this._send(ch, 6, message || {})
}
extension (ch, id, message) {
const buf = Buffer.allocUnsafe(varint.encodingLength(id) + message.length)
varint.encode(id, buf, 0)
message.copy(buf, varint.encode.bytes)
return this._send(ch, 15, buf)
}
ping () {
if (this._handshaking || this._pending.length) return
let ping = Buffer.from([0])
if (this._encryption !== null) {
ping = this._encryption.encrypt(ping)
}
return this.handlers.send(ping)
}
_onhandshake (err, remotePayload, split, overflow, remotePublicKey, handshakeHash) {
if (err) {
return this.destroy(new Error('Noise handshake error'))
}
if (!remotePayload) return this.destroy(new Error('Remote did not include a handshake payload.'))
this.remotePublicKey = remotePublicKey
this.handshakeHash = handshakeHash
try {
remotePayload = messages.NoisePayload.decode(remotePayload)
} catch (_) {
return this.destroy(new Error('Could not parse remote payload'))
}
this._handshake = null
this._handshaking = false
this._split = split
this._encryption = this.handlers.encrypted === false
? null
: new XOR({
rnonce: remotePayload.nonce,
tnonce: this._payload.nonce
}, split)
this.remotePayload = remotePayload
if (this.handlers.onhandshake) this.handlers.onhandshake()
if (this.destroyed) return
if (overflow) this.recv(overflow)
while (this._pending.length && !this.destroyed) {
this._sendNow(...this._pending.shift())
}
}
_send (channel, type, message) {
if (this._handshaking || this._pending.length) {
this._pending.push([channel, type, message])
return false
}
return this._sendNow(channel, type, message)
}
_sendNow (channel, type, message) {
if (type === 0 && message.key && !message.capability) {
message.capability = this.capability(message.key)
message.key = null
}
let data = this._messages.send(channel, type, message)
if (this._encryption !== null) {
data = this._encryption.encrypt(data)
}
return this.handlers.send(data)
}
capability (key) {
return crypto.capability(key, this._split)
}
remoteCapability (key) {
return crypto.capability(key, this._split)
}
recv (data) {
if (this._buffering !== null) this._buffering.push(data)
else this._recv(data)
}
_recv (data) {
if (this.destroyed) return
if (this.handshaking) {
this._handshaking.recv(data)
return
}
if (this._encryption !== null) {
data = this._encryption.decrypt(data)
}
if (!this._messages.recv(data)) {
this.destroy(this._messages.error)
}
}
destroy (err) {
if (this.destroyed) return
this.destroyed = true
if (this._handshake) this._handshake.destroy()
if (this._encryption) this._encyption.destroy()
if (this.handlers.destroy) this.handlers.destroy(err)
}
static keypair (seed) {
return DeviceHandshake.keyPair(seed)
}
}
function onopen (ch, message, self) {
if (self.handlers.onopen) self.handlers.onopen(ch, message)
}
function onverify (ch, message, self) {
if (self.handlers.onverify) self.handlers.onverify(ch, message)
}
function onproof (ch, message, self) {
if (self.handlers.onproof) self.handlers.onproof(ch, message)
}
function onreleaseseed (ch, message, self) {
if (self.handlers.onreleaseseed) self.handlers.onreleaseseed(ch, message)
}
function onwantkey (ch, message, self) {
if (self.handlers.onwantkey) self.handlers.onwantkey(ch, message)
}
function onprovidekey (ch, message, self) {
if (self.handlers.onprovidekey) self.handlers.onprovidekey(ch, message)
}
function onclose (ch, message, self) {
if (self.handlers.onclose) self.handlers.onclose(ch, message)
}
function onmessage (ch, type, message, self) {
if (type !== 15) return
const id = varint.decode(message)
const m = message.slice(varint.decode.bytes)
if (self.handlers.onextension) self.handlers.onextension(ch, id, m)
}
function onmissing (bytes, self) {
if (self.handlers.onmissing) self.handlers.onmissing(bytes)
}