Face Id not work in iphone 12

Please assist if any changes happen in iPhone 12 that make this issue
or it is related to my code.

I’m not aware of any Face ID-related changes for iPhone 12 specifically. I strongly suspect that this is some other problem in your app that just happens to show up on that hardware. I recommend that you extract your core Face ID code out into a small test app. That’ll help in two ways:

• If it doesn’t show the same problem, you know that the issue is being triggered by something in your main app.

• OTOH, if it does show the problem, you have a small test project that you can share with others.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"

Hello All,

I got status error -2500 when call this:

Code Block 
let status = SecItemCopyMatching(query as CFDictionary, &raw)

Any help why this happen in some of iPhone 12 pro and most of iPhone 12 pro max?

sorry the status code is : -25300

Error -25300 is errSecItemNotFound, which pretty much means what it says. It’s hard to say how you’re hitting this, so I’m going to reiterate my advice from earlier: Extract this code into a small test project so that you can isolate the circumstances under which it fails.

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"

Hi
Here is my code:

Singing data:

Code Block private func Signing(dataToBeSigned: String) -> String {
    do {
      let digest = dataToBeSigned.data(using: .utf8)!
      let singedData = try Shared.keypair.sign(digest, hash: .sha256)
      let signature = singedData.base64EncodedString()
      return signature
    } catch {
      return "Cannot sign data"
    }
  }

I call it from this code:

Code Block 
if(call.method == "Register") {
      guard let args = call.arguments else {
       
       return
      }
      if let myArgs = args as? [String: Any],
        let bla1 = myArgs["bla1"] as? String,
        let bla2 = myArgs["bla2"] as? String {
        let signatureBla1 = self?.Signing(dataToBeSigned:  bla1)
        let signatureBla2 = self?.Signing(dataToBeSigned: bla2)
        let publicKey = self?.getPublicKey()
        var list = [String]()
        list.append(publicKey!)
        list.append(signatureBla1!)
        list.append(signatureBla2!)
       result(list)
      } else {
       result("iOS could not extract flutter arguments in method: (sendParams)")
      }
      self?.Register(result: result)
}

Code Block 
call.method == "Register" 

is use to call Register Function from Flutter using MethodChannel.

Here is Shared:

Code Block 
struct Shared {
    static let keypair: EllipticCurveKeyPair.Manager = {
      EllipticCurveKeyPair.logger = { print($0) }
      let publicAccessControl = EllipticCurveKeyPair.AccessControl(protection: kSecAttrAccessibleAlwaysThisDeviceOnly, flags: [])
      let privateAccessControl = EllipticCurveKeyPair.AccessControl(protection: kSecAttrAccessibleAfterFirstUnlockThisDeviceOnly, flags: {
        return EllipticCurveKeyPair.Device.hasSecureEnclave ? [.userPresence, .privateKeyUsage] : [.userPresence]
      }())
      let config = EllipticCurveKeyPair.Config(
        publicLabel: "no.agens.sign.public",
        privateLabel: "no.agens.sign.private",
        operationPrompt: "Sign transact ion",
        publicKeyAccessControl: publicAccessControl,
        privateKeyAccessControl: privateAccessControl,
        token: .secureEnclaveIfAvailable)
      return EllipticCurveKeyPair.Manager(config: config)
    }()
  }

The sign the data and show the Face ID prompt I use this source code: agens-no/EllipticCurveKeyPair

The issue happen exactly in the shared source code of EllipticCurveKeyPair.swift line 366

Code Block 
let status = SecItemCopyMatching(query as CFDictionary, &raw) 

if other iphone the status 0 but in iphone 12 pro and pro max status -25300.

the query always passed in all iPhone like this

Code Block 
SecItemCopyMatching: ["kcls": 1, "u_AuthCtx": LAContext[2264:5], "u_OpPrompt": "Sign User", "class": keys, "labl": "no.agens.sign.private", "r_Ref": true]

I hope this will help you to understand the problem.

Here is my code:

Thanks. I can’t see anything obviously wrong but I’m not in a position to audit the whole EllipticCurveKeyPair wrapper on your behalf. You have a couple of choices:

• You can ask the author of that wrapper for help with your issue.

• You can punch through that layer, creating a small test project that works directly in terms of Apple APIs. Once you do that, I can help explain the behaviour of those APIs (either here or, if things get too complex, in the context of a DTS tech support incident).

Share and Enjoy
—
Quinn “The Eskimo!” @ Developer Technical Support @ Apple
let myEmail = "eskimo" + "1" + "@apple.com"