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core: support signature verification in p2p groups (forward compatibility) (#7058)

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* core: support signature verification in p2p groups (forward compatibility)

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Co-authored-by: Evgeny @ SimpleX Chat <259188159+evgeny-simplex@users.noreply.github.com>
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Evgeny
2026-06-07 12:01:40 +01:00
committed by GitHub
parent 5b93cb0e3f
commit 95349430c5
1 changed files with 5 additions and 2 deletions
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src/Simplex/Chat/Library/Subscriber.hs
+5 -2
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@@ -3462,8 +3462,11 @@ processAgentMessageConn cxt user@User {userId} corrId agentConnId agentMessage =
Just sm@SignedMsg {chatBinding, signatures, signedBody}
| GroupMember {memberPubKey = Just pubKey, memberId} <- member ->
case chatBinding of
CBGroup | Just GroupKeys {publicGroupId} <- groupKeys gInfo ->
let prefix = smpEncode chatBinding <> smpEncode (publicGroupId, memberId)
CBGroup ->
let prefix = smpEncode chatBinding <> bindingData
bindingData = case groupKeys gInfo of
Just GroupKeys {publicGroupId} -> smpEncode (publicGroupId, memberId)
Nothing -> smpEncode (memberId, pubKey) -- forward compatibility for verifying signed messages in p2p groups
in signed MSSVerified <$ guard (all (\(MsgSignature KRMember sig) -> C.verify (C.APublicVerifyKey C.SEd25519 pubKey) sig (prefix <> signedBody)) signatures)
_ -> signed MSSSignedNoKey <$ guard signatureOptional
| otherwise -> signed MSSSignedNoKey <$ guard (signatureOptional || unverifiedAllowed membership member tag)