# SecKeyCreateWithData(_:_:_:) Restores a key from an external representation of that key. ``` func SecKeyCreateWithData(_ keyData: CFData, _ attributes: CFDictionary, _ error: UnsafeMutablePointer?>?) -> SecKey? ``` ## Parameters `keyData` Data representing the key. The format of the data depends on the type of key being created. See the description of the return value of the [`SecKeyCopyExternalRepresentation(_:_:)`](/documentation/Security/SecKeyCopyExternalRepresentation(_:_:)) function for details. `attributes` A dictionary containing attributes describing the key to be imported. This dictionary must include at least the following keys: - [`kSecAttrKeyType`](/documentation/Security/kSecAttrKeyType) - [`kSecAttrKeyClass`](/documentation/Security/kSecAttrKeyClass) `error` The address of a object. If an error occurs, this is set to point at an error instance that describes the failure. ## Return Value The restored key or `NULL` on failure. In Objective-C, call to free the key’s memory when you are done with it. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)