Unable to cast object of type 'ECDsaSecurityTransforms' to type 'System.Security.Cryptography.ECDsaCng'.

Description

Trying to register a YubiKey 4 as a 2FA throws an invalidcastexception.

Code Used

Code used to produce the exception:

var parsed = AuthenticatorAttestationResponse.Parse(attestationResponse);
var success = parsed.VerifyAsync(
	options,
	new Fido2Configuration {
		ServerName = "Fido 2 local test",
		ServerDomain = "localhost",
		Origin = "https://localhost:63536",
	},
	(x) => Task.FromResult(true), // callback,
	null,
	null);

OR

var success = await fidoLib.MakeNewCredentialAsync(attestationResponse, options, callback);

Parameter Values

AuthenticatorAttestationRawResponse attestationResponse as Json:

{
  "Extensions": {
    "appid": false,
    "authnSel": false,
    "biometricPerfBounds": false
  },
  "Id": "cgwCz28pJtwpIpYjxvkMYzxxJk279q2lWF_4K_EmTSMUGplrdCTv-KGn6glBrc1jd10dLuAJY2wVgy-Ct1xZrQ",
  "RawId": "cgwCz28pJtwpIpYjxvkMYzxxJk279q2lWF_4K_EmTSMUGplrdCTv-KGn6glBrc1jd10dLuAJY2wVgy-Ct1xZrQ",
  "Response": {
    "AttestationObject": "o2NmbXRoZmlkby11MmZnYXR0U3RtdKJjc2lnWEYwRAIgXH6YWrE9Qc7_q5UH0fRROUq6Rl1zqneHegP8oLx_RskCIDzK8tHqPbywvXMHihhTpWPNMCU-_iqIvWALrGNfouZuY3g1Y4FZAk4wggJKMIIBMqADAgECAgRXFvfAMA0GCSqGSIb3DQEBCwUAMC4xLDAqBgNVBAMTI1l1YmljbyBVMkYgUm9vdCBDQSBTZXJpYWwgNDU3MjAwNjMxMCAXDTE0MDgwMTAwMDAwMFoYDzIwNTAwOTA0MDAwMDAwWjAsMSowKAYDVQQDDCFZdWJpY28gVTJGIEVFIFNlcmlhbCAyNTA1NjkyMjYxNzYwWTATBgcqhkjOPQIBBggqhkjOPQMBBwNCAARk2RxU1tlXjdOwYHhMRjbVSKOYOq81J87rLcbjK2eeM_zp6GMUrbz4V1IbL0xJn5SvcFVlviIZWym2Tk2tDdBiozswOTAiBgkrBgEEAYLECgIEFTEuMy42LjEuNC4xLjQxNDgyLjEuNTATBgsrBgEEAYLlHAIBAQQEAwIFIDANBgkqhkiG9w0BAQsFAAOCAQEAeJsYypuk23Yg4viLjP3pUSZtKiJ31eP76baMmqDpGmpI6nVM7wveWYQDba5_i6P95ktRdgTDoRsubXVNSjcZ76h2kw-g4PMGP1pMoLygMU9_BaPqXU7dkdNKZrVdXI-obgDnv1_dgCN-s9uCPjTjEmezSarHnCSnEqWegEqqjWupJSaid6dx3jFqc788cR_FTSJmJ_rXleT0ThtwA08J_P44t94peJP7WayLHDPPxca-XY5Mwn9KH0b2-ET4eMByi9wd-6Zx2hCH9Yzjjllro_Kf0FlBXcUKoy-JFHzT2wgBN9TmW7zrC7_lQYgYjswUMRh5UZKrOnOHqaVyfxBIhmhhdXRoRGF0YVjESZYN5YgOjGh0NBcPZHZgW4_krrmihjLHmVzzuoMdl2NBAAAAAAAAAAAAAAAAAAAAAAAAAAAAQHIMAs9vKSbcKSKWI8b5DGM8cSZNu_atpVhf-CvxJk0jFBqZa3Qk7_ihp-oJQa3NY3ddHS7gCWNsFYMvgrdcWa2lAQIDJiABIVggdNuG2tgs9Gxjgg30RMCcwrMd6Uovuv4QuUZlGr6tllwiWCDXHPD4i32zwChY7KvGuOSAOupKJpvod0zZX-y8DlQZkQ",
    "ClientDataJson": "eyJjaGFsbGVuZ2UiOiJNYmVpcXp3S0xpSGNKYUY1WGpDeVpBIiwiZXh0cmFfa2V5c19tYXlfYmVfYWRkZWRfaGVyZSI6ImRvIG5vdCBjb21wYXJlIGNsaWVudERhdGFKU09OIGFnYWluc3QgYSB0ZW1wbGF0ZS4gU2VlIGh0dHBzOi8vZ29vLmdsL3lhYlBleCIsIm9yaWdpbiI6Imh0dHBzOi8vbG9jYWxob3N0OjYzNTM2IiwidHlwZSI6IndlYmF1dGhuLmNyZWF0ZSJ9"
  },
  "Type": "public-key"
}

CredentialCreateOptions options as Json:

{
    "rp": {
        "id": "localhost",
        "name": "Fido 2 local test"
    },
    "user": {
        "name": "[e-mail]",
        "id": "YjYzYzMyZDU1ODI5NDUzZmFlY2JhZDQ5NjdjMDRkYmM",
        "displayName": "[e-mail]"
    },
    "challenge": "lr7HiuNiDw9ThdDpQhjpfA",
    "pubKeyCredParams": [
        {
            "type": "public-key",
            "alg": -7
        },
        {
            "type": "public-key",
            "alg": -257
        },
        {
            "type": "public-key",
            "alg": -37
        },
        {
            "type": "public-key",
            "alg": -35
        },
        {
            "type": "public-key",
            "alg": -258
        },
        {
            "type": "public-key",
            "alg": -38
        },
        {
            "type": "public-key",
            "alg": -36
        },
        {
            "type": "public-key",
            "alg": -259
        },
        {
            "type": "public-key",
            "alg": -39
        }
    ],
    "timeout": 60000,
    "attestation": "direct",
    "authenticatorSelection": {
        "requireResidentKey": false,
        "userVerification": "discouraged"
    },
    "excludeCredentials": [
        {
            "type": "public-key",
            "id": "AZMCIBCLkeohptOEnL3Y6irnVdcbnvro3X1PcifZdg2OG28tfq4raUhUmpjEIZh5MZm2BagibXhg6qcWNuqEklYPCnC8loXQ18DRmkRlTG85VRdr-IU7C7tAMi0diKQprU8rqaM"
        }
    ],
    "extensions": {
        "exts": true,
        "uvi": true,
        "loc": true,
        "uvm": true,
        "biometricPerfBounds": {
            "FAR": 3.40282347e+38,
            "FRR": 3.40282347e+38
        }
    },
    "status": "ok",
    "errorMessage": ""
}

Exception thrown

This throws an InvalidCastException:

Exception has occurred: CLR/System.AggregateException
Exception thrown: 'System.AggregateException' in System.Private.CoreLib.dll: 'One or more errors occurred.'
 Inner exceptions found, see $exception in variables window for more details.
 Innermost exception 	 System.InvalidCastException : Unable to cast object of type 'ECDsaSecurityTransforms' to type 'System.Security.Cryptography.ECDsaCng'.
   at Fido2NetLib.AttestationFormat.FidoU2f.Verify()
   at Fido2NetLib.AuthenticatorAttestationResponse.<VerifyAsync>d__10.MoveNext()

[abergs]

Great. scheduling a release in about 1 week to allow for feedback from others.

[WouterHD]

@abergs I was able to both register and verify my Yubikeys using the new release 🎉 Tested with firefox and chrome on MacOs