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Fix PKC on portduino sim by working around region blocks keygen and packet length (#10730)

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* Fix PKC on portduino sim by working around region blocks keygen and packet length

* Reserve Compressed framing overhead in sim loopback capacity check

The sim loopback re-encodes the Compressed wrapper back into
decoded.payload.bytes (the same 233-byte field its data is copied from),
so the carried bytes must leave room for protobuf framing. Checking
against sizeof(c.data.bytes) (233) let near-max payloads overflow
pb_encode_to_bytes(), which returns 0 and silently sends an empty
loopback payload. Cap at sizeof(decoded.payload.bytes) minus the
worst-case Compressed framing (meshtastic_Compressed_size - data size)
for both the ciphertext and plaintext paths.

Addresses Copilot review feedback on #10730.

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Potential fix for pull request finding

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

* Run trunk fmt

---------

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>
This commit is contained in:
Ben Meadors
2026-06-17 13:34:29 -05:00
committed by GitHub
co-authored by GitHub Copilot Autofix powered by AI
parent 358e4e2fcd
commit 5ffd30c4a8
3 changed files with 71 additions and 20 deletions
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src/mesh/NodeDB.cpp
+9 -2
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@@ -3051,8 +3051,15 @@ bool NodeDB::checkLowEntropyPublicKey(const meshtastic_Config_SecurityConfig_pub
bool NodeDB::generateCryptoKeyPair(const uint8_t *privateKey)
{
#if !(MESHTASTIC_EXCLUDE_PKI_KEYGEN || MESHTASTIC_EXCLUDE_PKI)
// Only generate keys for non-licensed users and if LoRa region is set
if (owner.is_licensed || config.lora.region == meshtastic_Config_LoRaConfig_RegionCode_UNSET) {
// Only generate keys for non-licensed users and if the LoRa region is set. The native simulator
// boots region-UNSET but still needs a keypair so PKI-encrypted DMs work between sim nodes, so
// allow keygen there regardless of region.
bool regionBlocksKeygen = config.lora.region == meshtastic_Config_LoRaConfig_RegionCode_UNSET;
#if ARCH_PORTDUINO
if (portduino_config.lora_module == use_simradio)
regionBlocksKeygen = false;
#endif
if (owner.is_licensed || regionBlocksKeygen) {
return false;
}