I can give you an article on how to find out r and s (private and public keys) of a signature using Python.

Understanding Ethereum Signature Format

Ethereum signatures are based on the Elliptic Curve Digital Signature Algorithm (ECDSA). The signature format consists of the hash, r, and s components of the signature. Here’s a breakdown of the format:

• signature_hash: 64-byte hash of the message

• «r»: 256-bit public key component

• s: 256-bit private key component

Python Code

Here’s an example Python code snippet that shows how to extract the r and s components of a signature:

import hashlib
from Crypto.PublicKey import EC





Set the signature hash
signature_hash = b'\x02\x01\x00\x00\x03\x12\x11\x14'

Extract the signature hash (hex)
hex_signature_hash = signature_hash.hex()

Get the public key components
public_key = EC().key
r_component = hex(signature_hash).replace('\x00', '')
s_component = hex(public_key.r) 
Note. Elliptic curve uses x, not y
print(f"r_component(bytes): {r_component}")
print(f"s_component(hex): {s_component}")

Explanation

• First, we define the signature hash as a byte object.

• The signature hash is obtained in hexadecimal format using the hex() method.

• We create an EC key from the public key component (elliptic curve uses x, not y). Note that we use “x” instead of “y” because ECDSA is based on elliptic curves with a different curve order than RSA.

• We remove the r and s components by converting the hexadecimal signature hash to bytes using thereplace(‘\x00′, »)’ method, which removes all null characters (\x00). The r component is now in byte format, but the s component remains in hexadecimal format.

Note: Ethereum ECDSA uses a different curve sequence than RSA. We use “x” instead of “y” because the elliptic curve uses x instead of y.

Example use case

You can use this code snippet to verify the authenticity and integrity of a signature. For example, you can create a new public key component using the following code:

public_key = EC().key
print(public_key)

This will output the public key component in byte format.

Hope this helps! Please contact us if you have any questions or need further assistance.

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