1. Daniel Holth
  2. ed25519ll


ed25519ll /

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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 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 the supercop-ref10 implementation of Ed25519, on my 2.6GHz Athlon achieving about 7200 signatures/second/core and 2900 verifications/second/core including the wrapper overhead.


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