Error adding Key item to macOS keychain

Question

I have following code:

let keyData = UUID().uuidString.data(using: .utf8)!

var attributes: [NSString: Any] = [
    kSecClass: kSecClassKey,
    kSecAttrApplicationTag: keyData,
]
let st1 = SecItemDelete(attributes as CFDictionary)
attributes[kSecValueData] = keyData
let st2 = SecItemAdd(attributes as CFDictionary, nil)

I am trying to add item to the keychain with type kSecClassKey. For some reason this code works perfectly in iOS and doesn't work in macOS. In macOS st1 is -25300 (which means The item cannot be found.) and st2 is -25299 (which means The item already exists.) What can I do to make this code work?

Max · Accepted Answer · 2017-07-15 07:24:51Z

1

The error errSecDuplicateItem (-25299) might also be returned if you miss a mandatory attribute, e.g., if you try to add a kSecClassGenericPassword key without the kSecAttrService set.

In your case I wonder why you try to store the UUID as a cryptographic key (kSecClassKey). Storing it as a generic password (kSecClassGenericPassword) instead would suffice.

let keyData = UUID().uuidString.data(using: .utf8)!

var attributes: [NSString: Any] = [
    kSecClass: kSecClassGenericPassword,
    kSecAttrService: "YourApp-UUID", // Determines the purpose/context of the used password/value
    kSecAttrLabel: "YourApp (UUID)", // Name of the Keychain item
    kSecValueData: keyData, // Actual value, that will be stored securely
]
let status = SecItemAdd(attributes as CFDictionary, nil)

answered Jul 15, 2017 at 7:24

Max

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