Things that use Curve25519

Updated: July 21, 2023

Here's a list of protocols and software that use or support the superfast, super secure Curve25519 ECDH function from Dan Bernstein. Note that Curve25519 ECDH should be referred to as X25519.

This page is organized by Protocols, Networks, Operating Systems, Hardware, Software, SSH Software, WireGuard Software, TLS Libraries, NaCl Crypto Libraries, lib25519, LibHydrogen, Libraries, Miscellaneous, Timeline notes, and Support coming soon.

You may also be interested in this list of Ed25519 deployment.



Operating Systems



SSH Software

WireGuard Software

Note: please see this WireGuard software list for more tools and things in the WireGuard ecosystem.

Other Software

Signal Protocol Libraries

TLS Libraries

NaCl Crypto Libraries

For cryptographic libraries in the NaCl family, including NaCl itself, TweetNaCl, uNaCl, and libsodium, as well as wrappers, bindings, and ports.


lib25519 "is a microlibrary for the X25519 encryption system and the Ed25519 signature system" that can be used directly in C or called by libraries in other languages using FFI. See the website for more information.


The Hydrogen library is designed for constrained environments like embedded devices, IoT (Internet of Things), and tiny computers.

Crypto Libraries

Other Libraries


Timeline notes

X25519 support coming soon!

"Powered by Curve25519"