# Curve25519.Signing.PrivateKey A Curve25519 private key used to create cryptographic signatures. ``` struct PrivateKey ``` ## Topics ### Creating a private key [`init()`](/documentation/CryptoKit/Curve25519/Signing/PrivateKey/init()) Creates a random Curve25519 private key for signing. [`init(rawRepresentation: D) throws`](/documentation/CryptoKit/Curve25519/Signing/PrivateKey/init(rawRepresentation:)) Creates a Curve25519 private key for signing from a data representation. ### Reporting the private key [`var rawRepresentation: Data`](/documentation/CryptoKit/Curve25519/Signing/PrivateKey/rawRepresentation) The raw representation of the key as a collection of contiguous bytes. ### Finding the public key [`var publicKey: Curve25519.Signing.PublicKey`](/documentation/CryptoKit/Curve25519/Signing/PrivateKey/publicKey) The corresponding public key. ### Creating a signature [`func signature(for: D) throws -> Data`](/documentation/CryptoKit/Curve25519/Signing/PrivateKey/signature(for:)) Generates an EdDSA signature over Curve25519. ## Relationships ### Conforms To [`Sendable`](/documentation/Swift/Sendable) [`SendableMetatype`](/documentation/Swift/SendableMetatype) --- 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)