mosh-dart

Pure Dart mosh protocol implementation. No native extensions, no FFI.

Used by the Unix Shells mobile app to run mosh on iOS and Android where bundling a C binary is impractical.

What it does

AES-128-OCB3 authenticated encryption (RFC 7253), SSP transport with sequencing and retransmission, datagram fragmentation, and protobuf state sync. Same wire format as C mosh.

Includes optional latch extension fields for capability negotiation and session control. Standard mosh servers ignore these (forward-compatible).

Files

• lib/ocb.dart -- AES-128-OCB3
• lib/mosh_transport.dart -- SSP transport
• lib/mosh_fragment.dart -- fragmentation and reassembly
• lib/mosh_pb.dart -- protobuf encoding (includes latch extensions)

License

Copyright (c) 2026 Unix Shells. MIT license. See LICENSE.