Methanium Transport Protocol

MTP is a modular transport protocol by Methanium.

Crates

• Common
• Crypto
• TypeMap
• Registry
• Codec
• Transport
• Host
• Client

Registry & TypeMaps

A TypeMap maps Communication-Types to a byte, and Data-Types to 2 bytes. A Communication- or Data-Type is a String to be used Plain in the code, while the Byte is transmitted.

The Registries map a TypeMap to a specific version of MTP.

Codec

The Codec crate handles encoding and decoding of MTP packets using Communication Types and Data Types from the Registry. The Codec has these Data Values:

• Container
• Encrypted Container
• Signed Integer
• Unsigned Integer
• Boolean
• Signed Float
• String
• Array
• Binary (List of Bytes)

The Codec uses the Crypto crate to encrypt and decrypt Encrypted Containers.

Transport

The Transport crate wraps QUIC.

Host & Client

The host creates a quic Server that listens for incoming connections. The host also manages the registry and versions to allow for backwards compatibility with clients.

The client connects to a quic Server and uses a registry to communicate with the host.

The Client may be Outdated while the Host is updated.

Common

Common Handles Logging and Error Handling. Personal information reported to Common will be anonmized.

Crypto Stack

Crate	Audited?	Notes
ml-dsa	No	NIST vectors pass; regression bug fixed Jan 2026
ed25519-dalek	Yes	Used by Signal, Diem
chacha20poly1305	Yes	NCC Group audit, Dec 2019
aes-gcm	Yes	NCC Group audit, Dec 2019
hkdf	No	Simple construction; well-reviewed
sha2	No	Standard construction; widely reviewed
zeroize	No	Simple; widely used
mlkem-tls	No	mlkem-rs backend unaudited