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Converting an Ethereum public key x value to y value: A step-by-step guide

Ethereum is a decentralized, open-source blockchain platform that uses public key cryptography to secure transactions. When you send or receive Ether (ETH) on the Ethereum network, you need to convert your Ethereum public key from hexadecimal format to the corresponding y value. This article walks you through the steps to achieve this conversion in Python.

Step 1: Understanding the Ethereum Public Key Format

Ethereum public keys are represented as a 64-character string of hexadecimal digits, with each character separated by a colon (:) and preceded by the letter «0». The format is typically:

«0x…y».

Where «…y» represents the y value.

Step 2: Install the «hmac» library

If you want to convert your Ethereum public key to its y-value, you need to use Python’s hmac library. This library provides a simple way to perform hash operations on hexadecimal strings. To install it, run the following command:

pip install hmac

Step 3: Convert the public key to hexadecimal

First, we need to convert your Ethereum public key from hexadecimal format to a string of hexadecimal digits:

import hmac
public_key = "020F031CA83F3FB372BD6C2430119E0B947CF059D19CDEA98F4CEFFEF620C584F9"
hex_public_key = public_key.encode("utf-8").hex()

Step 4: Create a hash object

Next, we create a hash object using the hmac library:

hash_object = hmac.new(hex_public_key, digestmod="sha256")

Note that you can use any hashing algorithm (e.g. «md5», «sha1», etc.) instead of «sha256». However, for this example, we will stick with «sha256».

Step 5: Get the y-value

Now we get the y-value from the hash object:

y_value = hash_object.hexdigest()

Put it all together

Here is the complete code snippet to convert the x-value of an Ethereum public key to its corresponding y-value in Python:

import hmac
def convert_ethereum_public_key_to_y(hex_public_key):
hexa_public_key = hex_public_key.encode("utf-8").hex()
hash_object = hmac.new(hex_public_key, digestmod="sha256")
y_value = hash_object.hexdigest()
return y_value
public_key = "020F031CA83F3FB372BD6C2430119E0B947CF059D19CDEA98F4CEFFEF620C584F9"
y_value = convert_ethereum_public_key_to_y(public_key)
print(y_value) 
Result: y-value of your Ethereum public key

That’s it! With these steps, you should now be able to convert the x-value of an Ethereum public key to its corresponding y-value in Python.

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