Curva - ECIES based on AES and HKDF

Simple library for Elliptic-Curve Integrated Encryption Scheme with Rijndael and Hmac-based Key Deriviation Function.

Replacement for blowcurve since blowfish is deprecated now.

Installation

This module uses ecdsa and PyCryptodome module as backend. No DLLs are needed.

This module is avaiable on PyPI:

$ pip install curva

Or you can download the source .tar.gz and execute setup.py manually:

$ python setup.py install

This module exposes interfaces for key agreement, signatures and encryptions.

Use class curva.Curva to access all interfaces:

>>> c1 = Curva() # create instance, generate keys
>>> c2 = Curva()

Use its export / exportHex method to export local public key, and load / loadHex method to load remote public key:

>>> c1.load(c2.export()) # bytes
>>> c2.loadHex(c1.exportHex()) # hex string

After exchanging public keys, a shared secret can now be established:

>>> c1.secret() == c2.secret() # shared secret (bytes)
True

Use the sign / verify method to create signatures and verify them:

>>> data = b'data'
>>> signature = c1.sign(data)
>>> c2.verify(data, signature)
True
>>> c2.verify(b'attack!', signature)
False

Use the encrypt / decrypt method to encrypt / decrypt data:

>>> data = b'data'
>>> encrypted = c1.encrypt(data)
>>> c2.decrypt(encrypted)
b'data'