This is an easy-to-use implementation of ECDSA cryptography (Elliptic Curve
Digital Signature Algorithm), implemented purely in Python, released under
the MIT license. With this library, you can quickly create keypairs (signing
key and verifying key), sign messages, and verify the signatures. The keys
and signatures are very short, making them easy to handle and incorporate
into other protocols.

Features

This library provides key generation, signing, and verifying, for five
popular NIST "Suite B" GF(p) curves, with key lengths of 192, 224, 256, 384,
and 521 bits. The "short names" for these curves, as known by the OpenSSL
tool (`openssl ecparam --list_curves`), are: prime192v1, secp224r1,
prime256v1, secp384r1, and secp521r1. It also includes the 256-bit curve used
by Bitcoin, whose short name is secp256k1. No other curves are included, but
it would not be too hard to add more.

WWW: https://github.com/warner/python-ecdsa