This package contains a simple reference implementation of Curve25519 and Curve448 (goldilocks) as specified in RFC7748.
Caution: this implementation is inadvisable for use if timing invariance matters. Future versions of this package may implement a C backend.
eccsnacks is a play on the word ecchacks, a cool site by djb and Tanja Lange.
pip install eccsnacks
These examples demonstrate the Diffie-Hellman operation for each curve.
from os import urandom
from eccsnacks.curve25519 import scalarmult, scalarmult_base
# Private keys in Curve25519 can be any 32-byte string.
a = urandom(32)
a_pub = scalarmult_base(a)
b = urandom(32)
b_pub = scalarmult_base(b)
# perform Diffie-Hellman computation for alice and bob
k_ab = scalarmult(a, b_pub)
k_ba = scalarmult(b, a_pub)
# keys should be the same
assert k_ab == k_bafrom os import urandom
from eccsnacks.curve448 import scalarmult, scalarmult_base
# Private keys in Curve448 can be any 32-byte string.
a = urandom(56)
a_pub = scalarmult_base(a)
b = urandom(56)
b_pub = scalarmult_base(b)
# perform Diffie-Hellman computation for alice and bob
k_ab = scalarmult(a, b_pub)
k_ba = scalarmult(b, a_pub)
# keys should be the same
assert k_ab == k_ba- Fast timing invariant implementation of both curves in C.
- More curves.
- curve25519-donna
- python-pure25519
- pynacl
- pysodium
- ... and more can be found on pypi
-
Matthew Dempsky for slownacl which initially served as a baseline when implementing Curve25519.
-
djb for Curve25519
-
Mike Hamburg for Curve448
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