Problem converting public key generated by startRegistration into proper Buffer for passkey authentication

[krisstern]

Hi everyone,

I have been trying to convert the public key string (one starting with the letter "M") generated by the startRegistration method into a format that is acceptable for passkey authentication by the verifyAuthenticationResponse, but it seems the results I got is a TypeError: cosePublicKey.get is not a function with credentialPublicKey: Uint8Array(91). I have tried using the test credentialPublicKey with value pQECAyYgASFYILTrxTUQv3X4DRM6L_pk65FSMebenhCx3RMsTKoBm-AxIlggEf3qk5552QLNSh1T1oQs7_2C2qysDwN4r4fCp52Hsqs as used in "https://github.com/MasterKale/SimpleWebAuthn/blob/master/packages/server/src/authentication/verifyAuthenticationResponse.test.ts", which can be converted in into a Uint8Array of size 77, which seemed to have been deemed acceptable by the verifyAuthenticationResponse method as input, though of course as this is dummy data the user is not verified as a result.

I wish someone with the insight could shed some light on this issue I have encountered. Any help in this regard would be much appreciated.

[krisstern]

To provide more context I am using the following config in my PublicKeyCredentialCreationOptionsJSON for the input options of the startRegistration method:

pubKeyCredParams: [
    { alg: -7, type: 'public-key' },
    { alg: -257, type: 'public-key' },
],

[krisstern]

And, I am using something like the below to convert the publicKey:

import { isoBase64URL } from '@simplewebauthn/server/helpers';

const base64URLPublicKey = isoBase64URL.fromBuffer(publicKey);

[Sreejit-Sengupto]

Yes I have somewhat similar problem, I am using appwrite, and I thought of saving the the 'verificationResultInfo' that contains publicKey in database in string format, by doing JSON.stringify, but the method is altering the verificationResult, what are the ideal ways of doing it? Thanks in advance.