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pythonethereum
Christian Papathanasiou
Christian Papathanasiou

Reputation: 320

How do I generate an Ethereum public key from a known private key using Python

I'm interested in generating an Ethereum public key from a private key using Python. I've tried googling around and found some resources but these are all JS nothing using Python itself.

Upvotes: 6

Views: 9218

Answers (2)

carver
carver

Reputation: 2349

Public Key vs Address

An account's address is the last 20 bytes of the keccak256 of the public key. Most tasks in Ethereum require the address instead of the public key.

Getting the Public Key

Install eth_keys with pip install eth-keys

from eth_keys import keys
from eth_utils import decode_hex

priv_key_bytes = decode_hex('0x44b9abf2708d9adeb1722dcc1e61bef14e5611dee710d66f106e356a111bef90')
priv_key = keys.PrivateKey(priv_key_bytes)
pub_key = priv_key.public_key

assert pub_key.to_hex() == '0xcabb8a3a73ea4a03d025a6ac2ebbbb19a545e4fb10e791ec9b5c942d77aa20760f64e4604cdfbec665435a382a8c9bfd560c6f0fca8a2708cda302f658368b36'

Getting the Address

Just in case the question was intending to ask about the address...

There are simpler ways to generate the address from scratch, but since we've already done the eth-keys setup, this is a one-liner:

assert pub_key.to_checksum_address() == '0xa0784ba3fcea41fD65a7A47b4cc1FA4C3DaA326f'

Upvotes: 10

Arghya Saha
Arghya Saha

Reputation: 5713

Too long for a comment. I'm not exactly sure how ethereum works and what exact problem you are facing.

But a quick google gave me these links

A reddit answer to something similar you are asking

The link which is being referred seems broken, so I did some backtracking, and here is the probable link to the referred code

python library for ethereum

Upvotes: 0

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