how to get the final public key from the generated keys

Question

0xbok opened this issue a year ago · comments

0xbok · Answer 1 · Thu Mar 02 2023 06:17:37 GMT+0800 (China Standard Time)

looks like it is y_sum_s in the generate key file.

ahsan-arif · Answer 2 · Fri Mar 03 2023 14:50:16 GMT+0800 (China Standard Time)

Hi! Is y_sum_s the public key? Here is what I did:

I generated an address from this y_sum_s vector by using the following code

const pkey = ethers.utils.computeAddress("0x" + Buffer.from(y_sum_s).toString("hex"));
Funded the account with 0.2 ETH, and signed the transaction to send 0.001 ETH to some address.
When I tried to broadcast the transaction I received an error saying something like "Insufficient funds for Gas + Value".

Can you please help in this regard?

0xbok · Answer 3 · Fri Mar 03 2023 19:03:49 GMT+0800 (China Standard Time)

yeah, i was probably wrong. I extracted the eth address using ecrecover:

Follow #177 (comment). In other words, apply this change narayanprusty@0aba299 by @narayanprusty.
Compile, and now when you sign using gg20_sign, supply the keccak hash as the message.
The signature will be r,s,recid. Get v=recid+1.
Use ecrecover to get the eth address or you can use any web3 library to get recover the public key or the address.

Confirm using multiple signatures that you are getting the same address back.