libhydrogen

Zero dynamic allocations and low stack requirements (median 32 bytes, max 128 bytes) make it ideal for microcontrollers and resource-constrained devices, as highlighted in the README.

Inspired by libsodium, it provides easy-to-use functions for common cryptographic tasks, reducing misuse by avoiding low-level primitives, as described in the features.

Written in standard C99, it works out of the box on Linux, BSD, macOS, Windows, and Arduino, ensuring broad compatibility for embedded and desktop applications.

Built exclusively with Curve25519 and Gimli, the small codebase is easy to audit for security, enhancing reliability in sensitive environments.