nim-libp2p/libp2p/protocols/pubsub/rpc/message.nim

70 lines
2.0 KiB
Nim

## Nim-LibP2P
## Copyright (c) 2019 Status Research & Development GmbH
## Licensed under either of
## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
## * MIT license ([LICENSE-MIT](LICENSE-MIT))
## at your option.
## This file may not be copied, modified, or distributed except according to
## those terms.
import options
import chronicles
import nimcrypto/sysrand
import messages, protobuf,
../../../peer,
../../../peerinfo,
../../../crypto/crypto,
../../../protobuf/minprotobuf
logScope:
topic = "PubSubMessage"
const PubSubPrefix = "libp2p-pubsub:"
proc msgId*(m: Message): string =
m.seqno.toHex() & PeerID.init(m.fromPeer).pretty
proc fromPeerId*(m: Message): PeerId =
PeerID.init(m.fromPeer)
proc sign*(msg: Message, p: PeerInfo): Message {.gcsafe.} =
var buff = initProtoBuffer()
encodeMessage(msg, buff)
if buff.buffer.len > 0:
result = msg
result.signature = p.privateKey.
sign(cast[seq[byte]](PubSubPrefix) & buff.buffer).
getBytes()
proc verify*(m: Message, p: PeerInfo): bool =
if m.signature.len > 0 and m.key.len > 0:
var msg = m
msg.signature = @[]
msg.key = @[]
var buff = initProtoBuffer()
encodeMessage(msg, buff)
var remote: Signature
var key: PublicKey
if remote.init(m.signature) and key.init(m.key):
trace "verifying signature", remoteSignature = remote
result = remote.verify(cast[seq[byte]](PubSubPrefix) & buff.buffer, key)
proc newMessage*(p: PeerInfo,
data: seq[byte],
topic: string,
sign: bool = true): Message {.gcsafe.} =
var seqno: seq[byte] = newSeq[byte](20)
if p.publicKey.isSome and randomBytes(addr seqno[0], 20) > 0:
var key: seq[byte] = p.publicKey.get().getBytes()
result = Message(fromPeer: p.peerId.getBytes(),
data: data,
seqno: seqno,
topicIDs: @[topic])
if sign:
result = result.sign(p)
result.key = key