Ethereum Library in Python

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Introduction

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In this article, we will build a basic Ethereum library in Python that provides functions for generating EC (elliptic curve) private key pairs, retrieving private and public keys, signing messages, and verifying signatures.

Library Code

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We will use the cryptography library, a popular and well-maintained library for cryptographic tasks in Python. We will also use the hmac library to generate MACs (message authentication codes) for the Ethereum blockchain.

Assembly

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To install the required libraries, run the following commands:

pip install cryptography

At the library:

Ethereum: Bitcoin library in python 

import os
serialization import from cryptography.hazmat.primitives
cryptography. hazmat. primitives. asymmetric import ec
import default_backend from cryptography.hazmat.backends
import base64
EthereumLibrary class:
def __init__(self, private_key=None):
If private_key:
self.private_key = private_key
Otherwise:

Generate a new EC key pair for each library instance
self.private_key = ec.generate_private_key(ec.SECP256K1(), default_backend())
def generate_ec_keypair(self, private_key=None):
If private_key Nothing:
private_key = self.private_key
return ec.generate_private_key(private_key, default_backend())
def get_private_key(self):
self.private_key(self):
return self.private_key.public_key()
def sign_message(self, message, public_key):
signature = public_key.sign(
message,
ec.dhparams(),
Asymmetric signing algorithm.SHA256()
)
return base64.b32encode(signature)
def verify_signature(self, message, signature, private_key):
try:
public_key = self.private_key.public_key()
public_key.verify(
signature,
message,
asymmetric VerifyingKey.dhparam(),
)
Return true.
Except:
Return false.

Usage example:
library = EthereumLibrary()

Generate a new EC key pair for each library instance
keypair = library.generate_ec_keypair()
private_key = library.get_private_key().public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat-Trustless,
encryption_algorithm=serialization.NoEncryption()
)

Sign the message with the public key
message = b"Hello world!"
signature = library.sign_message(message, keypair.public_key())
print(library.get_private_key().public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
))

Verify the signature using the private key
private_key.verify(
b"\x00\x01\x02\x03", 
Signature
b"Hello world!", 
message
key pair.private_key
)

Note that this is a simplified example and should not be used in production without further testing and validation. Additionally, note that generating an EC key pair for each instance of the library consumes a significant amount of memory.

Submission messages

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For Commit messages, follow standard professional guidelines:

  • Use an imperative (eg “feat: Ethereum library add”)
  • Keep the first line short (<72 characters)
  • Use the present tense (eg “Add new generation EC key pair”)

Example of a submission message:

Added basic Ethereum library to Python