About HKDFKit
HKDFKit is a library that provides a Swift implementation of the HMAC-based Key Derivation Function (HKDF) algorithm. HKDF is used for deriving cryptographic keys from shared secrets or passwords.
This library makes it easy to securely derive keys in your iOS or macOS applications. It follows the specifications provided in RFC 5869 and can be used in various scenarios, such as password-based key derivation, secure messaging protocols, and more.
Features
- Easy-to-use Swift API
- Supports HKDF-SHA1, HKDF-SHA256, and HKDF-SHA512 algorithms
- Provides secure key derivation for various scenarios
- Compatible with iOS and macOS
- Well-documented with code examples
Installation
You can add HKDFKit to your project by using Carthage or CocoaPods.
Getting Started
To get started with HKDFKit, follow these steps:
- Install HKDFKit using Carthage or CocoaPods
- Import the HKDFKit module into your project
- Create an instance of HKDF with the desired hash algorithm
- Use the method
deriveKey(_:salt:info:outputLength:)
to derive a secure key
Code Example
Here’s an example of using HKDFKit to derive a key:
import HKDFKit
// Create an instance of HKDF with SHA256 algorithm
let hkdf = HKDF(algorithm: .sha256)
// Define the input parameters for key derivation
let inputKeyMaterial = "mySharedSecret".data(using: .utf8)!
let salt = "somesalt".data(using: .utf8)!
let info = "additionalInfo".data(using: .utf8)!
let outputKeyLength = 32
// Derive the key
guard let derivedKey = hkdf.deriveKey(inputKeyMaterial, salt: salt, info: info, outputLength: outputKeyLength) else {
fatalError("Failed to derive key")
}
// Use the derived key as desired
print("Derived key: \(derivedKey.hexString)")
API Reference
The following methods are available in the HKDFKit library:
init(algorithm:)
: Initializes an HKDF instance with the specified HMAC algorithm.deriveKey(_:salt:info:outputLength:)
: Derives a key using the input key material, salt, info, and output length.
Contributing
HKDFKit is an open-source project and welcomes contributions from the community. If you have any suggestions, bug reports, or feature requests, feel free to open an issue or submit a pull request on GitHub.
License
This project is licensed under the MIT License. See the LICENSE file for more information.
That’s all you need to know to start using HKDFKit in your iOS or macOS projects. Happy key derivation!