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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

Fix issue 19

Fix ECDSA when mesaage hash length is greater than domain order length

Move from distutils to setuptools

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

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

Missing README update

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

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

Merge PR11, fixing an overflow with secp521k1

Initial 1.x series (Beta)

$ pip install ECPy

Download last dist tarball.

Untar it

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

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

$ python3 setup.py install

Clone the git repository

Rebuild the tarball

$ python3 setup.py sdist

Continue with the created tarball dist.

You can regenerate the doc from git clone

$ cd doc
$ make singlehtml

Documentation is in build dir