pybitmessage.pyelliptic.ecc module

Asymmetric cryptography using elliptic curves

class ECC(pubkey=None, privkey=None, pubkey_x=None, pubkey_y=None, raw_privkey=None, curve='sect283r1')[source]

Bases: object

Asymmetric encryption with Elliptic Curve Cryptography (ECC) ECDH, ECDSA and ECIES

>>> from binascii import hexlify
>>> import pyelliptic

>>> alice = pyelliptic.ECC() # default curve: sect283r1
>>> bob = pyelliptic.ECC(curve='sect571r1')

>>> ciphertext = alice.encrypt("Hello Bob", bob.get_pubkey())
>>> print(bob.decrypt(ciphertext))

>>> signature = bob.sign("Hello Alice")
>>> # alice's job :
>>> print(pyelliptic.ECC(
>>>     pubkey=bob.get_pubkey()).verify(signature, "Hello Alice"))

>>> # ERROR !!!
>>> try:
>>>     key = alice.get_ecdh_key(bob.get_pubkey())
>>> except:
>>>     print(
            "For ECDH key agreement, the keys must be defined"
            " on the same curve!")

>>> alice = pyelliptic.ECC(curve='sect571r1')
>>> print(hexlify(alice.get_ecdh_key(bob.get_pubkey())))
>>> print(hexlify(bob.get_ecdh_key(alice.get_pubkey())))
static get_curves()

Static method, returns the list of all the curves available

get_curve()

The name of currently used curve

get_curve_id()

Currently used curve

get_pubkey()

High level function which returns : curve(2) + len_of_pubkeyX(2) + pubkeyX + len_of_pubkeyY + pubkeyY

get_privkey()

High level function which returns curve(2) + len_of_privkey(2) + privkey

get_ecdh_key(pubkey)

High level function. Compute public key with the local private key and returns a 512bits shared key.

raw_get_ecdh_key(pubkey_x, pubkey_y)

ECDH key as binary data

check_key(privkey, pubkey)

Check the public key and the private key. The private key is optional (replace by None).

raw_check_key(privkey, pubkey_x, pubkey_y, curve=None)

Check key validity, key is supplied as binary data

sign(inputb, digest_alg=<_FuncPtr object>)

Sign the input with ECDSA method and returns the signature

verify(sig, inputb, digest_alg=<_FuncPtr object>)

Verify the signature with the input and the local public key. Returns a boolean.

static encrypt(data, pubkey, ephemcurve=None, ciphername='aes-256-cbc')

Encrypt data with ECIES method using the public key of the recipient.

static raw_encrypt(data, pubkey_x, pubkey_y, curve='sect283r1', ephemcurve=None, ciphername='aes-256-cbc')

ECDH encryption, keys supplied in binary data format

decrypt(data, ciphername='aes-256-cbc')

Decrypt data with ECIES method using the local private key