Is there way to verify signature without passing public key?

[Justin Seo]

Hi devs, While verifing signature, is there way to verify by wallet address instead of using public key?

`
const secp256K1PubKey = {
type: "tendermint/PubKeySecp256k1",
value: input.secp256k1PubKey
} as Secp256k1Pubkey

const signer = pubkeyToAddress(secp256K1PubKey, 'sei');
const rawPubKey = fromBase64(input.secp256k1PubKey);
const signDoc = makeADR36AminoSignDoc(signer, input.plainMessage)


const isVerified = await Secp256k1.verifySignature(
  Secp256k1Signature.fromFixedLength(fromBase64(input.signature)),
  sha256(serializeSignDoc(signDoc)),
  rawPubKey
);

`

while current codes works well, but I just want to verify signature with wallet address.

is there any way to do this?

[Simon Warta]

I never tried this in Cosmos space, but it might be possible using Secp256k1.recoverPubkey. For this you need an ExtendedSecp256k1Signature, which is just the signature plus a recovery param. If you don't have the recovery param you can loop through 0, 1, 2, 3 and check each public key you get.

[Justin Seo]

@webmaster128
“Simon the Best”
Thanks for answering, I’ll comment if this works :) thanks again

[Justin Seo]

@webmaster128

YYYYEEEAAAhhhh it works!!!! once again, Thanks for the help :)

since I'd need to change signature(A) which is result of signAmino to ExtendedSecp256k1Signature,

what I did is, use 'A' as plain message and instantiate it to ExtendedSecp256k1Signature
below is my source code.,

`
const sigFromSignAmino = signature.signature.signature; // result of signAmino
const x = new TextEncoder().encode(sigFromSignAmino);
const hashBuffer = await crypto.subtle.digest("SHA-256", x);
const privateKey = await getPrivateKeyFromMnemonic(
seiWalletSet2.mnemonic
);
const hashMessage = new Uint8Array(hashBuffer);
const sig = await Secp256k1.createSignature(
hashMessage,
privateKey as Uint8Array
);
console.log(sig); //extendedSig

    const pubKey = await Secp256k1.recoverPubkey(sig, hashMessage);
    console.dir(pubKey);

`