ed25519ll 0.2

A low-level cffi wrapper for Ed25519 digital signatures.

About Ed25519

Ed25519 is a public-key signature system with several attractive features including:

• Fast single-signature verification.

• Very fast signing.

• Fast key generation.

• High security level.

• Small signatures. Signatures fit into 64 bytes.

• Small keys. Public keys consume only 32 bytes.

This text abridged from http://ed25519.cr.yp.to/.

About ed25519ll

ed25519ll is a low-level cffi wrapper for the Ed25519 public key signature system. It uses distutils’ Extension() to compile a shared library that is not a Python extension module, and then uses cffi to talk to the library.

This wrapper currently exposes only the slow reference implementation of Ed25519, on my 2.6GHz Athlon achieving about 380 signatures/second/core including the wrapper overhead.

Example:

import ed25519ll
msg = b"The rain in Spain stays mainly on the plain"
kp = ed25519ll.crypto_sign_keypair()
signed = ed25519ll.crypto_sign(msg, kp.sk)
verified = ed25519ll.crypto_sign_open(signed, kp.vk)
assert verified == msg  # but ValueError is raised for bad signatures

0.2

• 100% test coverage

• Basic documentation

0.1

• Initial release