Verification error: Invalid key for curve: "Public key is not a point"

[KuznetsovNikita]

Hello
I have an issue during verification verifyAuthenticationResponse - in the function convertPublicKeyToPEM
The issue: Invalid key for curve: "Public key is not a point"

it's throw by this function jwkToPem:

const ecPEM = jwkToPem({
      kty: 'EC',
      // Specify curve as "P-256" from "p256"
      crv: COSECRV[crv as number].replace('p', 'P-'),
      x: (x as Buffer).toString('base64'),
      y: (y as Buffer).toString('base64'),
 });

The service is running locally

It's happen on macOs Catalina 10.15.7 when I try to verify Touch Id

Server algorithm - p256

Could you please help me?

[KuznetsovNikita]

In my case x and y is not a buffers, it's objects with looks like

{
0: 184
1: 30
2: 104
3: 232
4: 100
....
}

[MasterKale]

Hello @KuznetsovNikita, can you please include how you're calling verifyAuthenticationResponse()? I'm particularly interested in the value you're passing in for credential when you call it.

[KuznetsovNikita]

Hello @KuznetsovNikita, can you please include how you're calling verifyAuthenticationResponse()? I'm particularly interested in the value you're passing in for credential when you call it.

I'm use it in this way:

      const authentication = await startAuthentication(options);
      
      // and later
      
       const authenticator: AuthenticatorDevice = {
          credentialPublicKey: registrationInfo.credentialPublicKey,
          credentialID: registrationInfo.credentialID,
          counter: registrationInfo.counter,
          transports: credential.transports,
        };


       const authenticationResponse = await verifyAuthenticationResponse({
          credential: authentication,
          expectedChallenge: options.challenge,
          expectedOrigin: expectedOrigin,
          expectedRPID: expectedRPID,
          authenticator,
        });

I didn't serialize/deserialize startAuthentication response.

I guess the issue is that I try to run this function in a browser context. I try to run in the chrome extension background service worker, and the context for this environment is close to the browser instead node.

Do you know if it possible to verify authentication in the browser?
Thank you in advance!

[KuznetsovNikita]

I found a lot of discussions in discussions page.
Looks like it's not possible.
Thank you for your time.

[MasterKale]

Thank you for looking around, I'm glad to see you were able to find previous discussions around this. Your story is yet another point convincing me to try for a "universal" refactor to make SimpleWebAuthn work in more environments than just Node. I'll attempt that as part of addressing #268