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.

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 

