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Metamask: How to recover the public key using ecRecover in Python?

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Metamask: Recovering Public Keys Using ECRecover

In this article, we will explore the process of recovering public keys from Metamask using the JavaScript methodecRecover. This is useful if you need to verify signatures or interact with external services that require a digital signature.

Prerequisites

Before you begin, make sure you have:

  • MetaMask Max installed on your device.
  • Required libraries installed:ethers.jsandweb3.
  • Familiarity with JavaScript and the Ethereum blockchain API.

Step 1: Get the account address

First, you need to get the address of the account you want to recover the public key from. You can do this by calling thegetAccountAddress()method on the Web3 instance.

const web3 = new Web3(window.ethereum);
const account = await window.ethereum.request({
method: 'personal_ecRecover',
parameters: [
message,
// Your personal recovery seed (optional)
"your_seed_here"
],
from: {
name: 'Your_name',
email: "your_email@example.com",
image: " // Optional
}
})

Step 2. Call "ecRecover"

Once you have the account address, call the "ecRecover()" method to recover the public key:

const ec = new ethereum.JSBridge();
const recoverySession = await web3.eth.getEcdsaRecoverySession(account);
const signatureBuffer = await web3.eth.ecRecover(recoverySession);
const recoveredPublicKey = await ec.recoverSignature(signatureBuffer, 'your_signature_here');

In this example:

  • ecRecover()returns a recovery session object.
  • "getEcdsaRecoverySession()" is used to create a recovery session for the account address.
  • ecRecover()takes the recovered public key as an argument and signs it with your private key (not provided in this example).
  • The result is returned as a buffer.

Step 3: Convert to Web3 address

To convert the recovered public key to a Web3 compatible address, you can use the following code:

const web3 = new Web3(window.ethereum);
const RecedAddress = await window.ethereum.request({
method: 'personal_ecRecover',
parameters: [
RecedPublicKey,
// Your recovery seed (optional)
'your_covery_seed_here'
],
from: {
name: 'Your name',
email: "your_email@example.com",
image: " // Optional
}
})

This will return the recovered address.

Example Use Case

Here is an example use case that shows how to recover a public key using Python ecRecover’:

import web3







Metamask: How to recover public key using ecRecover in Python?


Set up a Web3 instance on your local network
w3 = web3.Web3(web3.HTTPProvider('

Get the account address from MetaMask
account_address = await w3.eth.request(
"personal_ecRecover",
params=[
b'message', 
Your message or data to sign
'your_seed_here' 
Optional personal recovery seed
],
from={'name': 'Your name', 'email': 'your_email@example.com'}
)

Get the account address recovery session
recovery_session = await w3.eth.getEcdsaRecoverySession(account_address)

Create a signable object with the recovered public key
signature_buffer = await w3.eth.ecRecover(recover_session, b'recovered_public_key_here')

Sign a message using the recovered signature
signer = web3.eth.account.sign(
'message', 
Your data to be signed
recovery_session,
signature_buffer
)

Send the signed message using Web3
w3.eth.sendSignedTransaction(signer)

This code shows how to recover a public key, create a signable object, and sign a message using Python’s ‘ecRecover’.

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