I can provide you with an article on how to extract r and s (private and public keys) from a signature using Python.
About Ethereum Signature Format
Ethereum signatures are based on the Elliptic Curve Digital Signature Algorithm (ECDSA). The signature format consists of a hash of the signature and the r and s components. Here’s a breakdown of the format:
signature_hash: A 64-byte hash of the message
r: A 256-bit public key component
s: A 256-bit private key component
Python Code
Here’s a sample Python code snippet that shows how to extract the r and s components from a signature:
import hashlib
from Crypto.PublicKey import EC
![Ethereum: how do you figure out the r and s out of a signature using python [closed]](https://makolli.tj/wp-content/uploads/2025/02/2ed550f4.png)
Define the signature hashsignature_hash = b'\x02\x01\x00\x00\x03\x12\x11\x14'
Extract the signature hash value (hex)hex_signature_hash = signature_hash.hex()
Get the public key componentspublic_key = EC().key
r_component = hex(signature_hash).replace('\x00', '')
s_component = hex(public_key.r)
Note: Elliptic Curve uses x instead of yprint(f"r_component (byte): {r_component}")
print(f"s_component (hex): {s_component}")
Explanation
- First, we define the signature hash as a byte object.
- We extract the signature hash value in hexadecimal format using the
hex()method.
- We create an EC key from the public key component (Elliptic Curve uses x instead of y). Note that we use
xinstead ofybecause ECDSA is based on elliptic curves with a different order of curves than RSA.
- We extract the r and s components by converting the hexadecimal signature hash to bytes using the
replace('\x00', '')method, which removes all null characters (\x00). The r component is now in byte format, while the s component remains in hexadecimal format.
Note: In Ethereum, ECDSA uses a different curve order 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 the signature. For example, you can create a new public key component using the following code:
public_key = EC().key
print(public_key)
This will return the public key component in byte format.
Hope this helps! If you have any questions or need further assistance, please feel free to contact me.
