ECPy

ECPy (pronounced ekpy), is a pure python Elliptic Curve library providing ECDSA, EDDSA (Ed25519), ECSchnorr, Borromean signatures as well as Point operations.

Full html documentation is available here.

ECDSA sample

from ecpy.curves     import Curve,Point
from ecpy.keys       import ECPublicKey, ECPrivateKey
from ecpy.ecdsa      import ECDSA

cv   = Curve.get_curve('secp256k1')
pu_key = ECPublicKey(Point(0x65d5b8bf9ab1801c9f168d4815994ad35f1dcb6ae6c7a1a303966b677b813b00,
                       0xe6b865e529b8ecbf71cf966e900477d49ced5846d7662dd2dd11ccd55c0aff7f,
                       cv))
pv_key = ECPrivateKey(0xfb26a4e75eec75544c0f44e937dcf5ee6355c7176600b9688c667e5c283b43c5,
                  cv)


signer = ECDSA()
sig    = signer.sign(b'01234567890123456789012345678912',pv_key)
assert(signer.verify(b'01234567890123456789012345678912',sig,pu_key))

Point sample

from ecpy.curves     import Curve,Point

cv = Curve.get_curve('secp256k1')
P  = Point(0x65d5b8bf9ab1801c9f168d4815994ad35f1dcb6ae6c7a1a303966b677b813b00,
           0xe6b865e529b8ecbf71cf966e900477d49ced5846d7662dd2dd11ccd55c0aff7f,
           cv)
k  = 0xfb26a4e75eec75544c0f44e937dcf5ee6355c7176600b9688c667e5c283b43c5
Q  = k*P
R  = P+Q

History

1.2.3

Fix ECSchnorr when r is greater than order. Main use case is when using a hash function with bitlength greater than curve size.

1.2.2

Fix ECDSA with rfc6979. Field was used instead of order for max random.

1.2.1

Missing README update

1.2.0

Fix rfc6979. Now conform to RFC and fully compat with python-ecdsa (https://github.com/warner/python-ecdsa).

1.1.0

Fix DER encoding for length greater than 128

Declare ONE infinity point per curve. Consider global (non attached to a curve) infinity point as deprecated

Fix infinity point management in ECDSA

Fix issue #13

1.0.1beta

Merge PR11, fixing an overflow with secp521k1

1.0.0beta

Initial 1.x series (Beta)

Quick Install

From Pypi

$ pip install ECPy

From Github

From tarball dist

Download last dist tarball.

Untar it

$ tar xzvf ECPy-M.m.tar.gz

install it (or use it as is...)

$ python3 setup.py install

From sources

Clone the git repository

Rebuild the tarball

$ python3 setup.py sdist

Continue with the created tarball dist.

Generate the documentation

You can regenerate the doc from git clone

$ cd doc
$ make singlehtml

Documentation is in build dir