Module traits 

Platform abstraction traits for SCP.

These four traits abstract device-specific capabilities behind Rust trait interfaces so that production implementations (Secure Enclave, Android Keystore) and testing implementations (in-memory) share the same API surface. See ADR-006 for the full platform adapter design.

Traits

• KeyCustody — Cryptographic key management (generation, signing, ECDH, pseudonym derivation)
• DeviceAttestation — Device-level attestation tokens
• Push — Push notification registration and handling
• Storage — Persistent key-value byte storage

Structs

DeviceAttestationToken

A device attestation token produced by DeviceAttestation::attest.

KeyHandle

Opaque handle to a cryptographic key managed by a KeyCustody implementation.

PseudonymKeypair

A deterministic pseudonym keypair derived from an identity key and a context ID via KeyCustody::derive_pseudonym.

PublicKey

A public key extracted from a KeyHandle.

PushToken

A push notification token returned by Push::register.

SharedSecret

A 32-byte X25519 shared secret produced by KeyCustody::dh_agree.

Signature

An Ed25519 signature produced by KeyCustody::sign.

WakeSignal

A wake signal produced by Push::handle_notification.

Enums

CustodyType

The custody type for a given key, indicating where the key material is stored and how it is protected.

KeyType

The type of cryptographic key managed by a KeyHandle.

Traits

DeviceAttestation

Device attestation trait.

KeyCustody

Cryptographic key management trait.

Push

Push notification trait.

Storage

Persistent key-value byte storage trait.