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The Hydrogen library is a small, easy-to-use, hard-to-misuse cryptographic library for constrained environments.
Features:
- Consistent high-level API, inspired by libsodium. Instead of low-level primitives, it exposes simple functions to solve common problems that cryptography can solve.
- 100% built using just two cryptographic building blocks: the Curve25519 elliptic curve, and the Gimli permutation.
- Small and easy to audit.
- The whole code is released under a single, very liberal license (ISC).
- Can generate cryptographically-secure random numbers, even on Arduino boards.
- Attempts to mitigate the implications of accidental misuse.
Non-goals:
- Having multiple primitives serving the same purpose, even to provide compatibility with other libraries.
- Networking -- but a simple key exchange API based on the NOISE protocol is available.
- Replacing libsodium. Libhydrogen focuses on being small and is for environments where libsodium cannot be used.
This is a work in progress.