# SecKeyCopyKeyExchangeResult(_:_:_:_:_:) Performs the Diffie-Hellman style of key exchange with optional key-derivation steps. ``` func SecKeyCopyKeyExchangeResult(_ privateKey: SecKey, _ algorithm: SecKeyAlgorithm, _ publicKey: SecKey, _ parameters: CFDictionary, _ error: UnsafeMutablePointer?>?) -> CFData? ``` ## Return Value A data object representing the result of the key exchange operation or `NULL` on failure. In Objective-C, call to free the data object’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)