fastecdsa

Fast elliptic curve digital signatures

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AntonKueltz

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Project description

About

This is a python package for doing fast elliptic curve cryptography, specifically digital signatures.

There is no nonce reuse, no branching on secret material, and all points are validated before any operations are performed on them. Timing side challenges are mitigated via Montgomery point multiplication. Nonces are generated per RFC6979. The default curve used throughout the package is P256 which provides 128 bits of security. If you require a higher level of security you can specify the curve parameter in a method to use a curve over a bigger field e.g. P384. All that being said, crypto is tricky and I’m not beyond making mistakes. Please use a more established and reviewed library for security critical applications. Open an issue or email me if you see any security issue or risk with this library.

Python Versions Supported

The initial release of this package was targeted at python2.7. Earlier versions may work but have no guarantee of correctness or stability. As of release 1.2.1+ python3 is supported as well. Due to python2’s EOL on January 1st 2020 release 2.x of this package only supports python3.5+.

Operating Systems Supported

This package is targeted at the Linux and MacOS operating systems. Due to the the dependency on the GMP C library building this package on Windows is difficult and no official support or distributions are provided for Windows OSes. See issue11 for what users have done to get things building.

Supported Primitives

Curves over Prime Fields

Name	Class	Proposed By
P192 / secp192r1	`fastecdsa.curve.P192`	NIST / NSA
P224 / secp224r1	`fastecdsa.curve.P224`	NIST / NSA
P256 / secp256r1	`fastecdsa.curve.P256`	NIST / NSA
P384 / secp384r1	`fastecdsa.curve.P384`	NIST / NSA
P521 / secp521r1	`fastecdsa.curve.P521`	NIST / NSA
secp192k1	`fastecdsa.curve.secp192k1`	Certicom
secp224k1	`fastecdsa.curve.secp224k1`	Certicom
secp256k1 (bitcoin curve)	`fastecdsa.curve.secp256k1`	Certicom
brainpoolP160r1	`fastecdsa.curve.brainpoolP160r1`	BSI
brainpoolP192r1	`fastecdsa.curve.brainpoolP192r1`	BSI
brainpoolP224r1	`fastecdsa.curve.brainpoolP224r1`	BSI
brainpoolP256r1	`fastecdsa.curve.brainpoolP256r1`	BSI
brainpoolP320r1	`fastecdsa.curve.brainpoolP320r1`	BSI
brainpoolP384r1	`fastecdsa.curve.brainpoolP384r1`	BSI
brainpoolP512r1	`fastecdsa.curve.brainpoolP512r1`	BSI

Arbitrary Curves

As of version 1.5.1 construction of arbitrary curves in Weierstrass form (y^2 = x^3 + ax + b (mod p)) is supported. I advise against using custom curves for any security critical applications. It’s up to you to make sure that the parameters you pass here are correct, no validation of the base point is done, and in general no sanity checks are done. Use at your own risk.

from fastecdsa.curve import Curve
curve = Curve(
    name,  # (str): The name of the curve
    p,  # (long): The value of p in the curve equation.
    a,  # (long): The value of a in the curve equation.
    b,  # (long): The value of b in the curve equation.
    q,  # (long): The order of the base point of the curve.
    gx,  # (long): The x coordinate of the base point of the curve.
    gy,  # (long): The y coordinate of the base point of the curve.
    oid  # (str): The object identifier of the curve (optional).
)

Hash Functions

Any hash function in the hashlib module (md5, sha1, sha224, sha256, sha384, sha512) will work, as will any hash function that implements the same interface / core functionality as the those in hashlib. For instance, if you wish to use SHA3 as the hash function the pysha3 package will work with this library as long as it is at version >=1.0b1 (as previous versions didn’t work with the hmac module which is used in nonce generation). Note that sha3_224, sha3_256, sha3_384, sha3_512 are all in hashlib as of python3.6.

Performance

Curves over Prime Fields

Currently it does elliptic curve arithmetic significantly faster than the ecdsa package. You can see the times for 1,000 signature and verification operations over various curves below. These were run on an early 2014 MacBook Air with a 1.4 GHz Intel Core i5.

Curve	`fastecdsa` time	`ecdsa` time	Speedup
P192	3.62s	1m35.49s	~26x
P224	4.50s	2m13.42s	~29x
P256	6.15s	2m52.43s	~28x
P384	12.11s	6m21.01s	~31x
P521	22.21s	11m39.53s	~31x
secp256k1	5.92s	2m57.19s	~30x

Installing

You can use pip: $ pip install fastecdsa or clone the repo and use $ python setup.py install. Note that you need to have a C compiler. You also need to have GMP on your system as the underlying C code in this package includes the gmp.h header (and links against gmp via the -lgmp flag). You can install all dependencies as follows:

apt

$ sudo apt-get install python3-dev libgmp3-dev

brew

$ brew install gmp

yum

$ sudo yum install python-devel gmp-devel

Development

This package uses uv for package management. You can install it via pip install uv. First build the C extension modules

$ uv run python setup.py build_ext --inplace

To run the test suite use the following command

$ uv run pytest

Install pre-commit hooks to ensure type checking and autoformatting happens before you commit your code

$ uv run pre-commit install

To build the docs use the following command, which will create a docs/_build directory with the docs built as HTML files

$ cd docs
$ uv run make html

Publishing

Note that currently only the package owner is able to publish releases to PyPI. The following steps can still be used to generate source and wheel distributions, but note that the publish command will not work.

To build a release first install all supported versions of python into the environment (double check pyproject.toml for which python versions are supported)

$ uv python install 3.9 3.10 3.11 3.12 3.13

Then build a source distribution, followed by wheels for each supported python version

$ uv build --sdist
$ uv build --wheel -p 3.x  # do this for each supported python version

Then publish the source and wheels distributions to the test PyPI account.

$ uv publish --token {token} --url https://test.pypi.org/simple/

Benchmarking

If you’d like to benchmark performance on your machine you can do so using the command:

$ uv run benchmark

This will use the timeit module to benchmark 1000 signature and verification operations for each curve supported by this package. Alternatively, if you have not cloned the repo but have installed the package via e.g. pip you can use the following command:

$ python -m fastecdsa.benchmark

Usage

Generating Keys

You can use this package to generate keys if you like. Recall that private keys on elliptic curves are integers, and public keys are points i.e. integer pairs.

from fastecdsa import keys, curve

"""The reason there are two ways to generate a keypair is that generating the public key requires
a point multiplication, which can be expensive. That means sometimes you may want to delay
generating the public key until it is actually needed."""

# generate a keypair (i.e. both keys) for curve P256
priv_key, pub_key = keys.gen_keypair(curve.P256)

# generate a private key for curve P256
priv_key = keys.gen_private_key(curve.P256)

# get the public key corresponding to the private key we just generated
pub_key = keys.get_public_key(priv_key, curve.P256)

Signing and Verifying

Some basic usage is shown below:

from fastecdsa import curve, ecdsa, keys
from hashlib import sha384

m = "a message to sign via ECDSA"  # some message

''' use default curve and hash function (P256 and SHA2) '''
private_key = keys.gen_private_key(curve.P256)
public_key = keys.get_public_key(private_key, curve.P256)
# standard signature, returns two integers
r, s = ecdsa.sign(m, private_key)
# should return True as the signature we just generated is valid.
valid = ecdsa.verify((r, s), m, public_key)

''' specify a different hash function to use with ECDSA '''
r, s = ecdsa.sign(m, private_key, hashfunc=sha384)
valid = ecdsa.verify((r, s), m, public_key, hashfunc=sha384)

''' specify a different curve to use with ECDSA '''
private_key = keys.gen_private_key(curve.P224)
public_key = keys.get_public_key(private_key, curve.P224)
r, s = ecdsa.sign(m, private_key, curve=curve.P224)
valid = ecdsa.verify((r, s), m, public_key, curve=curve.P224)

''' using SHA3 via pysha3>=1.0b1 package '''
import sha3  # pip install [--user] pysha3==1.0b1
from hashlib import sha3_256
private_key, public_key = keys.gen_keypair(curve.P256)
r, s = ecdsa.sign(m, private_key, hashfunc=sha3_256)
valid = ecdsa.verify((r, s), m, public_key, hashfunc=sha3_256)

Arbitrary Elliptic Curve Arithmetic

The Point class allows arbitrary arithmetic to be performed over curves. The two main operations are point addition and point multiplication (by a scalar) which can be done via the standard python operators (+ and * respectively):

# example taken from the document below (section 4.3.2):
# https://koclab.cs.ucsb.edu/teaching/cren/docs/w02/nist-routines.pdf

from fastecdsa.curve import P256
from fastecdsa.point import Point

xs = 0xde2444bebc8d36e682edd27e0f271508617519b3221a8fa0b77cab3989da97c9
ys = 0xc093ae7ff36e5380fc01a5aad1e66659702de80f53cec576b6350b243042a256
S = Point(xs, ys, curve=P256)

xt = 0x55a8b00f8da1d44e62f6b3b25316212e39540dc861c89575bb8cf92e35e0986b
yt = 0x5421c3209c2d6c704835d82ac4c3dd90f61a8a52598b9e7ab656e9d8c8b24316
T = Point(xt, yt, curve=P256)

# Point Addition
R = S + T

# Point Subtraction: (xs, ys) - (xt, yt) = (xs, ys) + (xt, -yt)
R = S - T

# Point Doubling
R = S + S  # produces the same value as the operation below
R = 2 * S  # S * 2 works fine too i.e. order doesn't matter

d = 0xc51e4753afdec1e6b6c6a5b992f43f8dd0c7a8933072708b6522468b2ffb06fd

# Scalar Multiplication
R = d * S  # S * d works fine too i.e. order doesn't matter

e = 0xd37f628ece72a462f0145cbefe3f0b355ee8332d37acdd83a358016aea029db7

# Joint Scalar Multiplication
R = d * S + e * T

Importing and Exporting Keys

You can also export keys as files, ASN.1 encoded and formatted per RFC5480 and RFC5915. Both private keys and public keys can be exported as follows:

from fastecdsa.curve import P256
from fastecdsa.keys import export_key, gen_keypair

d, Q = gen_keypair(P256)
# save the private key to disk
export_key(d, curve=P256, filepath='/path/to/exported/p256.key')
# save the public key to disk
export_key(Q, curve=P256, filepath='/path/to/exported/p256.pub')

Keys stored in this format can also be imported. The import function will figure out if the key is a public or private key and parse it accordingly:

from fastecdsa.keys import import_key

# if the file is a private key then parsed_d is a long and parsed_Q is a Point object
# if the file is a public key then parsed_d will be None
parsed_d, parsed_Q = import_key('/path/to/file.key')

Other encoding formats can also be specified, such as SEC1 for public keys. This is done using classes found in the fastecdsa.encoding package, and passing them as keyword args to the key functions:

from fastecdsa.curve import P256
from fastecdsa.encoding.sec1 import SEC1Encoder
from fastecdsa.keys import export_key, gen_keypair, import_key

_, Q = gen_keypair(P256)
export_key(Q, curve=P256, filepath='/path/to/p256.key', encoder=SEC1Encoder)
parsed_Q = import_key('/path/to/p256.key', curve=P256, public=True, decoder=SEC1Encoder)

Encoding Signatures

DER encoding of ECDSA signatures as defined in RFC2459 is also supported. The fastecdsa.encoding.der provides the DEREncoder class which encodes signatures:

from fastecdsa.encoding.der import DEREncoder

r, s = 0xdeadc0de, 0xbadc0de
encoded = DEREncoder.encode_signature(r, s)
decoded_r, decoded_s = DEREncoder.decode_signature(encoded)

Acknowledgements

Thanks to those below for contributing improvements:

boneyard93501
clouds56
m-kus
sirk390
targon
NotStatilko
bbbrumley
luinxz
JJChiDguez
J08nY
trevor-crypto
sylvainpelissier
akaIDIOT
Peter-Bergman

Project details

These details have been verified by PyPI

Project links

pypi
repo

GitHub Statistics

Maintainers

AntonKueltz

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docs

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This version

3.0.1

Jan 28, 2025

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Reason this release was yanked:

Various architecture's wheel C extensions were improperly built in CI/CD

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SHA256	`bb11b805f0c9c4e6b8eb8766b7eeaf9b7e425ff2f17eed08a402568e0548734d`
MD5	`c00d27a8d6836ca5c0d36fa2329f05e5`
BLAKE2b-256	`9bb7de7e1789c3a7e97dedffa01a61868669d4aff5500e71bf71f220473212ac`

Algorithm	Hash digest
SHA256	`2c730285951bd3dce40ff6ba0527847864d4fc63145c8479d5245e5544de4ee8`
MD5	`887acc0f3bf476d1e8469d798a572f96`
BLAKE2b-256	`781cf37f8afb09f32ce7874b312dfa5098a2b4963e40ed094c46b4d939677d8e`

Algorithm	Hash digest
SHA256	`e99b2695f3cbf363fa4fc12e036b5a2b50a01004b82972dce102bb73fa1833bd`
MD5	`869b48e126bb2fd99398aea4a0e1189e`
BLAKE2b-256	`d5d1641baf79b39671488b2f0141b80ef816a5c8bf5128d469da1dd9b729108b`

Algorithm	Hash digest
SHA256	`5793ac17891bc8c7002c8364b5df32ac17b486a68c6e32d941f3f0b3641b417b`
MD5	`a8f5fd55a0e62f10947ee66397ffb7be`
BLAKE2b-256	`917cd7d224daabf5b00eb1ca154b90fa73f3a46f292df1af636338c7039c2c35`

Algorithm	Hash digest
SHA256	`4a59a2488302fdd9b92a17629740a5fc1800e9cc51ff7f0a279277a13ed7ad00`
MD5	`b03a256d2d33f79eaf4f542ff4799179`
BLAKE2b-256	`91da3f0458754b850743b7bd2c219b26917d9d368360e66fef101a8310da3bfb`

Algorithm	Hash digest
SHA256	`637657f860bb0335af3ad87b1e00dfdd679aa05509945c9277ee96df1b07d437`
MD5	`dc5b0155e85c9225997c84c1b8c2847e`
BLAKE2b-256	`8707ff511db993cd78d2ed1cda68e0c5f5ec937f1677789ac0903c6000d7cb21`

Algorithm	Hash digest
SHA256	`67209d556a2da673a52b6dfaddb90be551b0deb9eb7802c313f8495b0b5071e5`
MD5	`89826a3ff1340bbbf3220bde87bb0317`
BLAKE2b-256	`53b0aab9131895b5932787d97a7b383ae65cf6feee1c7833394e9fd2f078ad85`

Algorithm	Hash digest
SHA256	`1a33ae3779500226fb1a8ae9b14e25467169f6021a611735d9cf9303575c903f`
MD5	`a499fc54649a93aca2b4b4c2fd8e576c`
BLAKE2b-256	`25328cd8b76293a82feaef9760795259cd07d494b7d10832c3c2ea9ee4950b31`

fastecdsa 3.0.1

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