lib25519 using NEON for ARM64
ARM64 optimisations for lib25519 microlibrary
Network protocols in today's world rely on elliptic-curve cryptography (ECC) to protect communication against espionage and sabotage. lib25519 (https://lib25519.cr.yp.to) is a software library for the Curve25519 elliptic curve (https://cr.yp.to/ecdh/curve25519-20060209.pdf), including the X25519 encryption system and the Ed25519 signature system. Curve25519 is the fastest curve in TLS 1.3, and the only curve in Wireguard, Signal, and many other applications (https://ianix.com/pub/curve25519-deployment.html). Currently the optimizations in lib25519 use serial instructions and vector instructions for Intel and AMD CPUs, and use serial instructions for ARM CPUs, but do not use vector instructions for ARM CPUs. This project aims at exploiting the NEON vector instructions of 64-bit ARM CPUs and extend lib25519 by providing top speeds for those CPUs, in particular setting new speed records for X25519 key generation and Ed25519 signing, while meeting the security constraint of not leaking secret information through timing.
- The project's own website: https://lib25519.cr.yp.to/
This project was funded through the NGI0 Core Fund, a fund established by NLnet with financial support from the European Commission's Next Generation Internet programme, under the aegis of DG Communications Networks, Content and Technology under grant agreement No 101092990.
