# init(x963Representation:) Creates a P-256 public key for signing from an ANSI x9.63 representation. ``` init(x963Representation: Bytes) throws where Bytes : ContiguousBytes ``` ## Parameters `x963Representation` An ANSI x9.63 representation of the key. --- 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)