Repository Overview

The PostGuard project is split across multiple repositories in the encryption4all GitHub organization. This page gives an overview of each repository and how they fit together.

Cryptographic Libraries

These are the low-level building blocks that implement the cryptographic primitives PostGuard relies on.

Repository	Language	Description
pg-curve	Rust	Fork of BLS12-381 elliptic curve with target group serialization
ibe	Rust	Identity-Based Encryption schemes on BLS12-381
ibs	Rust	Identity-Based Signature schemes

Core

The main PostGuard codebase and applications.

Repository	Language	Description
postguard	Rust	Core library, PKG server, WASM bindings, CLI, FFI bindings
postguard-website	SvelteKit	Web frontend for encrypting and sending files
cryptify	Rust + TypeScript	File encryption and sharing service (backend + frontend)
postguard-tb-addon	TypeScript	Thunderbird email encryption extension
postguard-outlook-addon	TypeScript	Outlook email encryption add-in

SDKs

Client libraries for integrating PostGuard into applications.

Repository	Language	Description
postguard-js	TypeScript	Browser and Node.js SDK (@e4a/pg-js)
postguard-dotnet	C#	.NET SDK for sending-side encryption (E4A.PostGuard)
pg-components	Svelte	Reusable UI component library (@e4a/pg-components)

Examples

From the postguard-examples repository:

Project	Language	Description
pg-sveltekit	TypeScript	SvelteKit web app using @e4a/pg-js
pg-dotnet	C#	.NET console app using E4A.PostGuard

Dependency Graph

The repositories depend on each other roughly as follows:

pg-curve
  └── ibe
        └── postguard (pg-core)
              ├── pg-wasm ──────────────── postguard-js (@e4a/pg-js)
              │                              ├── postguard-website
              │                              ├── postguard-tb-addon
              │                              └── postguard-outlook-addon
              ├── pg-ffi ───────────────── postguard-dotnet
              ├── pg-pkg (PKG server)
              └── pg-cli
  └── ibs (used by pg-core for sender signatures)

pg-components ──────────── postguard-website
cryptify (backend) ─────── postguard-website (file storage)