88 lines
2.5 KiB
Nim
88 lines
2.5 KiB
Nim
## Nim-LibP2P
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## Copyright (c) 2019 Status Research & Development GmbH
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## Licensed under either of
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## * Apache License, version 2.0, ([LICENSE-APACHE](LICENSE-APACHE))
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## * MIT license ([LICENSE-MIT](LICENSE-MIT))
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## at your option.
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## This file may not be copied, modified, or distributed except according to
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## those terms.
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import options
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import chronicles, stew/byteutils
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import metrics
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import nimcrypto/sysrand
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import messages, protobuf,
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../../../peer,
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../../../peerinfo,
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../../../crypto/crypto,
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../../../protobuf/minprotobuf
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logScope:
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topic = "PubSubMessage"
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const PubSubPrefix = "libp2p-pubsub:"
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declareCounter(libp2p_pubsub_sig_verify_success, "pubsub successfully validated messages")
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declareCounter(libp2p_pubsub_sig_verify_failure, "pubsub failed validated messages")
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proc msgIdProvider(m: Message): string =
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## default msg id provider
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crypto.toHex(m.seqno) & PeerID.init(m.fromPeer).pretty
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template msgId*(m: Message): string =
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## calls the ``msgIdProvider`` from
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## the instantiation scope
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##
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mixin msgIdProvider
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m.msgIdProvider()
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proc fromPeerId*(m: Message): PeerId =
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PeerID.init(m.fromPeer)
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proc sign*(msg: Message, p: PeerInfo): Message {.gcsafe.} =
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var buff = initProtoBuffer()
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encodeMessage(msg, buff)
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if buff.buffer.len > 0:
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result = msg
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result.signature = p.privateKey.
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sign(PubSubPrefix.toBytes() & buff.buffer).tryGet().
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getBytes()
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proc verify*(m: Message, p: PeerInfo): bool =
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if m.signature.len > 0 and m.key.len > 0:
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var msg = m
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msg.signature = @[]
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msg.key = @[]
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var buff = initProtoBuffer()
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encodeMessage(msg, buff)
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var remote: Signature
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var key: PublicKey
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if remote.init(m.signature) and key.init(m.key):
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trace "verifying signature", remoteSignature = remote
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result = remote.verify(PubSubPrefix.toBytes() & buff.buffer, key)
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if result:
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libp2p_pubsub_sig_verify_success.inc()
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else:
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libp2p_pubsub_sig_verify_failure.inc()
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proc newMessage*(p: PeerInfo,
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data: seq[byte],
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topic: string,
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sign: bool = true): Message {.gcsafe.} =
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var seqno: seq[byte] = newSeq[byte](8)
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if randomBytes(addr seqno[0], 8) > 0:
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if p.publicKey.isSome:
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var key: seq[byte] = p.publicKey.get().getBytes().tryGet()
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result = Message(fromPeer: p.peerId.getBytes(),
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data: data,
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seqno: seqno,
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topicIDs: @[topic])
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if sign:
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result = result.sign(p)
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result.key = key
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