libprio-rs

Pure Rust implementation of Prio, a system for Private, Robust, and Scalable Computation of Aggregate Statistics.

Exposure Notifications Private Analytics

Prior versions of this crate were used in the Exposure Notifications Private Analytics system. This is referred to in various places as Prio v2. See prio-server or the ENPA whitepaper for more details.

Verifiable Distributed Aggregation Function

This crate implements a Verifiable Distributed Aggregation Function (VDAF) called "Prio3", implemented in the vdaf module, allowing Prio to be used in the Distributed Aggregation Protocol protocol being developed in the PPM working group at the IETF. This support is still evolving along with the DAP and VDAF specifications.

Draft versions and release branches

The main branch is under continuous development and will sometimes be partway between VDAF drafts. libprio uses stable release branches to maintain implementations of different VDAF draft versions. Crate prio version x.y.z is released from a corresponding release/x.y branch. We try to maintain Rust SemVer compatibility, meaning that API breaks only happen on minor version increases (e.g., 0.10 to 0.11).

Cargo Features

This crate defines the following feature flags:

Features that are not marked as "Semver stable" may undergo breaking changes in future patch releases, as an exception to semantic versioning.