Merge branch 'develop'

.gitignore

@@ -1,18 +1,10 @@
-# Xcode
-#
-# gitignore contributors: remember to update Global/Xcode.gitignore, Objective-C.gitignore & Swift.gitignore
+## General
+.DS_Store
+.swiftpm
+.build/
 
-## User settings
-xcuserdata/
-
-## compatibility with Xcode 8 and earlier (ignoring not required starting Xcode 9)
-*.xcscmblueprint
-*.xccheckout
-
-## compatibility with Xcode 3 and earlier (ignoring not required starting Xcode 4)
-build/
-DerivedData/
-*.moved-aside
+## Various settings
+Package.resolved
 *.pbxuser
 !default.pbxuser
 *.mode1v3
@@ -21,70 +13,5 @@ DerivedData/
 !default.mode2v3
 *.perspectivev3
 !default.perspectivev3
-
-## Obj-C/Swift specific
-*.hmap
-
-## App packaging
-*.ipa
-*.dSYM.zip
-*.dSYM
-
-## Playgrounds
-timeline.xctimeline
-playground.xcworkspace
-
-# Swift Package Manager
-#
-# Add this line if you want to avoid checking in source code from Swift Package Manager dependencies.
-# Packages/
-# Package.pins
-# Package.resolved
-# *.xcodeproj
-#
-# Xcode automatically generates this directory with a .xcworkspacedata file and xcuserdata
-# hence it is not needed unless you have added a package configuration file to your project
-# .swiftpm
-
-.build/
-
-# CocoaPods
-#
-# We recommend against adding the Pods directory to your .gitignore. However
-# you should judge for yourself, the pros and cons are mentioned at:
-# https://guides.cocoapods.org/using/using-cocoapods.html#should-i-check-the-pods-directory-into-source-control
-#
-# Pods/
-#
-# Add this line if you want to avoid checking in source code from the Xcode workspace
-# *.xcworkspace
-
-# Carthage
-#
-# Add this line if you want to avoid checking in source code from Carthage dependencies.
-# Carthage/Checkouts
-
-Carthage/Build/
-
-# Accio dependency management
-Dependencies/
-.accio/
-
-# fastlane
-#
-# It is recommended to not store the screenshots in the git repo.
-# Instead, use fastlane to re-generate the screenshots whenever they are needed.
-# For more information about the recommended setup visit:
-# https://docs.fastlane.tools/best-practices/source-control/#source-control
-
-fastlane/report.xml
-fastlane/Preview.html
-fastlane/screenshots/**/*.png
-fastlane/test_output
-
-# Code Injection
-#
-# After new code Injection tools there's a generated folder /iOSInjectionProject
-# https://github.com/johnno1962/injectionforxcode
-
-iOSInjectionProject/
+xcuserdata/
+*.xcuserdatad/

LICENSE

@@ -1,6 +1,6 @@
 MIT License
 
-Copyright (c) 2020 Aleksey Zgurskiy
+Copyright (c) 2025 ANGD Dev
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to deal

Package.swift

@@ -0,0 +1,18 @@
+// swift-tools-version: 5.10
+// The swift-tools-version declares the minimum version of Swift required to build this package.
+
+import PackageDescription
+
+let package = Package(
+    name: "KeychainKit",
+    platforms: [.macOS(.v10_15), .iOS(.v13)],
+    products: [
+        .library(name: "KeychainKit", targets: ["KeychainKit"]),
+    ],
+    dependencies: [
+        .package(url: "https://github.com/apple/swift-docc-plugin", from: "1.0.0")
+    ],
+    targets: [
+        .target(name: "KeychainKit")
+    ]
+)

README.md

@@ -1 +1,60 @@
-# keychain-kit
+# KeychainKit
+
+KeychainKit is a type-safe, easy-to-use wrapper around Apple’s Keychain service that supports storing, retrieving, and deleting data with optional local authentication.
+
+## Overview
+
+This library enables working with Keychain without losing control over security settings while simplifying type-safe access to data types like `Data`, `String`, `UUID`, and any `Codable` types.
+
+It supports optional authentication via `LAContext`, allowing integration with Face ID, Touch ID, or device passcode.
+
+KeychainKit does not hide the complexity of Keychain operations but provides a clean API and convenient error handling via a custom `KeychainError` type.
+
+## Requirements
+
+- **Swift**: 5.10+
+- **Platforms**: macOS 10.15+, iOS 13.0+
+
+## Installation
+
+To add KeychainKit to your project, use Swift Package Manager (SPM).
+
+### Adding to an Xcode Project
+
+1. Open your project in Xcode.
+2. Navigate to the `File` menu and select `Add Package Dependencies`.
+3. Enter the repository URL: `https://github.com/angd-dev/keychain-kit.git`
+4. Choose the version to install (e.g., `2.1.0`).
+5. Add the library to your target module.
+
+### Adding to Package.swift
+
+If you are using Swift Package Manager with a `Package.swift` file, add the dependency like this:
+
+```swift
+// swift-tools-version: 5.10
+import PackageDescription
+
+let package = Package(
+    name: "YourProject",
+    dependencies: [
+        .package(url: "https://github.com/angd-dev/keychain-kit.git", from: "2.1.0")
+    ],
+    targets: [
+        .target(
+            name: "YourTarget",
+            dependencies: [
+                .product(name: "KeychainKit", package: "keychain-kit")
+            ]
+        )
+    ]
+)
+```
+
+## Additional Resources
+
+For more information and usage examples, see the [documentation](https://docs.angd.dev/?package=keychain-kit&version=2.1.0).
+
+## License
+
+This project is licensed under the MIT License. See the `LICENSE` file for details.

Sources/KeychainKit/Classes/KeychainStorage.swift

@@ -0,0 +1,170 @@
+import Foundation
+import LocalAuthentication
+import Security
+
+/// A type-safe storage abstraction over the Keychain service.
+///
+/// Supports storing, retrieving, and deleting generic data associated with
+/// accounts and services, with optional local authentication context support.
+///
+/// ## Topics
+///
+/// ### Initializers
+///
+/// - ``init(service:context:)``
+///
+/// ### Instance Properties
+///
+/// - ``service``
+/// - ``context``
+///
+/// ### Retrieving Values
+///
+/// - ``get(_:)``
+///
+/// ### Storing Values
+///
+/// - ``set(_:for:)``
+///
+/// ### Deleting Values
+///
+/// - ``delete(_:)``
+public final class KeychainStorage<
+    Account: KeychainAccountProtocol,
+    Service: KeychainServiceProtocol
+>: KeychainStorageProtocol {
+    // MARK: - Properties
+    
+    /// The service metadata associated with this Keychain storage instance.
+    public let service: Service?
+    
+    /// An optional local authentication context used for biometric or passcode protection.
+    public let context: LAContext?
+    
+    // MARK: - Inits
+    
+    /// Creates a new `KeychainStorage` instance with the given service and authentication context.
+    ///
+    /// - Parameters:
+    ///   - service: An optional `Service` instance representing the keychain service metadata.
+    ///   - context: An optional `LAContext` instance for authentication protection.
+    public init(service: Service?, context: LAContext?) {
+        self.service = service
+        self.context = context
+    }
+    
+    // MARK: - Methods
+    
+    /// Retrieves raw `Data` stored in the keychain for the specified account.
+    ///
+    /// - Parameter account: The account identifier used to locate the stored value.
+    /// - Returns: The raw data associated with the specified account.
+    ///
+    /// - Throws: ``KeychainError/itemNotFound`` if no matching item is found in the keychain.
+    /// - Throws: ``KeychainError/authenticationFailed`` if biometric or device authentication fails.
+    /// - Throws: ``KeychainError/unexpectedData`` if the retrieved data is missing or corrupted.
+    /// - Throws: ``KeychainError/unexpectedCode(_:)`` for any other unexpected OSStatus error.
+    public func get(_ account: Account) throws(KeychainError) -> Data {
+        var query: [CFString: Any] = [
+            kSecClass: kSecClassGenericPassword,
+            kSecAttrAccount: account.identifier,
+            kSecAttrSynchronizable: account.synchronizable,
+            kSecUseDataProtectionKeychain: true,
+            kSecMatchLimit: kSecMatchLimitOne,
+            kSecReturnAttributes: true,
+            kSecReturnData: true
+        ]
+        
+        query[kSecAttrService] = service?.identifier
+        query[kSecAttrAccessGroup] = service?.accessGroup
+        query[kSecUseAuthenticationContext] = context
+        
+        var queryResult: AnyObject?
+        let status = withUnsafeMutablePointer(to: &queryResult) {
+            SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
+        }
+        
+        switch status {
+        case errSecSuccess:
+            guard
+                let item = queryResult as? [CFString : AnyObject],
+                let data = item[kSecValueData] as? Data
+            else { throw KeychainError.unexpectedData }
+            return data
+        case errSecItemNotFound:
+            throw KeychainError.itemNotFound
+        case errSecAuthFailed:
+            throw KeychainError.authenticationFailed
+        default:
+            throw KeychainError.unexpectedCode(status)
+        }
+    }
+    
+    /// Stores raw `Data` in the keychain for the specified account, replacing any existing value.
+    ///
+    /// This method first deletes any existing keychain item for the account, then creates a new
+    /// item with the specified data and applies the access control settings from the account's
+    /// protection and flags.
+    ///
+    /// - Parameters:
+    ///   - value: The raw data to store.
+    ///   - account: The account identifier conforming to `KeychainAccountProtocol`.
+    ///
+    /// - Throws: ``KeychainError/unexpectedError(_:)`` if access control creation fails.
+    /// - Throws: ``KeychainError/unexpectedCode(_:)`` if adding the new item to the keychain fails.
+    /// - Throws: Any error thrown by ``delete(_:)`` if the existing item cannot be removed.
+    public func set(_ value: Data, for account: Account) throws(KeychainError) {
+        try delete(account)
+        
+        var error: Unmanaged<CFError>?
+        let access = SecAccessControlCreateWithFlags(
+            nil, account.protection, account.accessFlags, &error
+        )
+        
+        guard let access else {
+            throw KeychainError.unexpectedError(error?.takeUnretainedValue())
+        }
+        
+        var query: [CFString: Any] = [
+            kSecClass: kSecClassGenericPassword,
+            kSecAttrAccount: account.identifier,
+            kSecAttrSynchronizable: account.synchronizable,
+            kSecUseDataProtectionKeychain: true,
+            kSecAttrAccessControl: access,
+            kSecValueData: value
+        ]
+        
+        query[kSecAttrService] = service?.identifier
+        query[kSecAttrAccessGroup] = service?.accessGroup
+        query[kSecUseAuthenticationContext] = context
+        
+        let status = SecItemAdd(query as CFDictionary, nil)
+        guard status == noErr else {
+            throw KeychainError.unexpectedCode(status)
+        }
+    }
+    
+    /// Deletes the keychain item associated with the specified account.
+    ///
+    /// If no item exists for the given account, this method completes silently without error.
+    ///
+    /// - Parameter account: The account identifier conforming to `KeychainAccountProtocol`.
+    /// - Throws: ``KeychainError/unexpectedCode(_:)`` if the deletion fails with an unexpected OSStatus.
+    public func delete(_ account: Account) throws(KeychainError) {
+        var query: [CFString: Any] = [
+            kSecClass: kSecClassGenericPassword,
+            kSecAttrAccount: account.identifier,
+            kSecAttrSynchronizable: account.synchronizable,
+            kSecUseDataProtectionKeychain: true
+        ]
+        
+        query[kSecAttrService] = service?.identifier
+        query[kSecAttrAccessGroup] = service?.accessGroup
+        query[kSecUseAuthenticationContext] = context
+        
+        let status = SecItemDelete(query as CFDictionary)
+        guard status == errSecSuccess || status == errSecItemNotFound else {
+            throw KeychainError.unexpectedCode(status)
+        }
+    }
+}

Sources/KeychainKit/Enums/KeychainError.swift

@@ -0,0 +1,41 @@
+import Foundation
+
+/// Errors that can occur during Keychain operations.
+public enum KeychainError: Error, Equatable {
+    /// Authentication failed, e.g., due to biometric or passcode denial.
+    case authenticationFailed
+    /// No item found matching the query.
+    case itemNotFound
+    /// Unexpected or corrupted data found in Keychain item.
+    case unexpectedData
+    /// An unexpected OSStatus error code returned by Keychain API.
+    case unexpectedCode(OSStatus)
+    /// A generic unexpected error, with optional underlying error info.
+    case unexpectedError(Error?)
+    
+    /// Compares two `KeychainError` values for equality.
+    ///
+    /// - Parameters:
+    ///   - lhs: The first `KeychainError` to compare.
+    ///   - rhs: The second `KeychainError` to compare.
+    /// - Returns: `true` if both errors are of the same case and represent the same error details.
+    ///
+    /// For `.unexpectedError`, the comparison is based on the underlying `NSError` identity,
+    /// which includes domain and error code.
+    public static func == (lhs: Self, rhs: Self) -> Bool {
+        switch (lhs, rhs) {
+        case (.authenticationFailed, .authenticationFailed):
+            true
+        case (.itemNotFound, .itemNotFound):
+            true
+        case (.unexpectedData, .unexpectedData):
+            true
+        case (.unexpectedCode(let lCode), .unexpectedCode(let rCode)):
+            lCode == rCode
+        case (.unexpectedError(let lErr), .unexpectedError(let rErr)):
+            lErr as NSError? == rErr as NSError?
+        default:
+            false
+        }
+    }
+}

Sources/KeychainKit/Protocols/KeychainAccountProtocol.swift

@@ -0,0 +1,47 @@
+import Foundation
+
+/// A protocol that defines the required properties for a keychain account descriptor.
+///
+/// Types conforming to this protocol provide metadata for configuring secure storage
+/// and access behavior for keychain items.
+public protocol KeychainAccountProtocol {
+    /// A unique string used to identify the keychain account.
+    var identifier: String { get }
+    
+    /// The keychain data protection level for the account.
+    ///
+    /// Defaults to `kSecAttrAccessibleAfterFirstUnlock`. You may override it to use other
+    /// accessibility levels, such as `kSecAttrAccessibleWhenUnlocked`
+    /// or `kSecAttrAccessibleWhenPasscodeSetThisDeviceOnly`.
+    var protection: CFString { get }
+    
+    /// The access control flags used to define authentication requirements.
+    ///
+    /// Defaults to `[]` (no additional access control). Can be overridden to specify
+    /// constraints such as `.userPresence`, `.biometryAny`, or `.devicePasscode`.
+    var accessFlags: SecAccessControlCreateFlags { get }
+    
+    /// Whether the item should be marked as synchronizable via iCloud Keychain.
+    ///
+    /// Defaults to `false`. Set to `true` if the item should sync across devices.
+    var synchronizable: Bool { get }
+}
+
+public extension KeychainAccountProtocol {
+    /// Default value for `protection`: accessible after first unlock.
+    var protection: CFString { kSecAttrAccessibleAfterFirstUnlock }
+    
+    /// Default value for `accessFlags`: no access control constraints.
+    var accessFlags: SecAccessControlCreateFlags { [] }
+    
+    /// Default value for `synchronizable`: not synchronized across devices.
+    var synchronizable: Bool { false }
+}
+
+public extension KeychainAccountProtocol where Self: RawRepresentable, Self.RawValue == String {
+    /// Provides a default `identifier` implementation for `RawRepresentable` types
+    /// whose `RawValue` is `String`.
+    ///
+    /// The `identifier` is derived from the raw string value.
+    var identifier: String { rawValue }
+}

Sources/KeychainKit/Protocols/KeychainServiceProtocol.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+/// A protocol that defines the required properties for a keychain service descriptor.
+///
+/// Types conforming to this protocol provide an identifier used to distinguish stored items
+/// and may optionally specify an access group to enable keychain sharing between apps.
+public protocol KeychainServiceProtocol {
+    /// A unique string used to identify the keychain service.
+    var identifier: String { get }
+
+    /// An optional keychain access group identifier to support shared access between apps.
+    ///
+    /// The default implementation returns `nil`, indicating no access group is specified.
+    var accessGroup: String? { get }
+}
+
+public extension KeychainServiceProtocol {
+    /// The default implementation returns `nil`, indicating that no access group is specified.
+    var accessGroup: String? { nil }
+}
+
+public extension KeychainServiceProtocol where Self: RawRepresentable, Self.RawValue == String {
+    /// Provides a default `identifier` implementation for `RawRepresentable` types
+    /// whose `RawValue` is `String`.
+    ///
+    /// The `identifier` is derived from the raw string value.
+    var identifier: String { rawValue }
+}

Sources/KeychainKit/Protocols/KeychainStorageProtocol.swift

@@ -0,0 +1,224 @@
+import Foundation
+
+/// A protocol that defines a type-safe interface for storing and retrieving values
+/// in the system keychain.
+///
+/// This protocol provides generic support for `Data`, `String`, `UUID`, and `Codable` types.
+/// It allows configuring the associated account and service context for each operation.
+///
+/// Types conforming to this protocol must specify concrete types for `Account`
+/// and `Service`, which describe keychain item identity and service grouping.
+///
+/// ## Topics
+///
+/// ### Associated Types
+///
+/// - ``Account``
+/// - ``Service``
+///
+/// ### Instance Properties
+///
+/// - ``service``
+///
+/// ### Retrieving Values
+///
+/// - ``get(_:)-2gcee``
+/// - ``get(_:)-23z7h``
+/// - ``get(_:)-4xbe6``
+/// - ``get(_:decoder:)``
+///
+/// ### Storing Values
+///
+/// - ``set(_:for:)-21dla``
+/// - ``set(_:for:)-6nzkf``
+/// - ``set(_:for:)-2smpc``
+/// - ``set(_:for:encoder:)``
+///
+/// ### Deleting Values
+///
+/// - ``delete(_:)``
+public protocol KeychainStorageProtocol {
+    /// A type that describes a keychain account and its security configuration.
+    associatedtype Account: KeychainAccountProtocol
+    
+    /// A type that identifies a keychain service context (e.g., app or subsystem).
+    associatedtype Service: KeychainServiceProtocol
+    
+    /// The service associated with this keychain storage instance.
+    ///
+    /// This value is used as the `kSecAttrService` when interacting with the keychain.
+    /// If `nil`, the default service behavior is used.
+    var service: Service? { get }
+    
+    /// Retrieves the value stored in the keychain for the specified account as raw `Data`.
+    ///
+    /// - Parameter account: The keychain account whose value should be retrieved.
+    /// - Returns: The data associated with the given account.
+    /// - Throws: An error if the item is not found, access is denied, or another keychain error occurs.
+    func get(_ account: Account) throws(KeychainError) -> Data
+    
+    /// Retrieves the value stored in the keychain for the specified account as a UTF-8 string.
+    ///
+    /// - Parameter account: The keychain account whose value should be retrieved.
+    /// - Returns: A string decoded from the stored data using UTF-8 encoding.
+    /// - Throws: An error if the item is not found, the data is not valid UTF-8,
+    ///   or a keychain access error occurs.
+    func get(_ account: Account) throws(KeychainError) -> String
+    
+    /// Retrieves the value stored in the keychain for the specified account as a `UUID`.
+    ///
+    /// - Parameter account: The keychain account whose value should be retrieved.
+    /// - Returns: A UUID decoded from a 16-byte binary representation stored in the keychain.
+    /// - Throws: An error if the item is not found, the data is not exactly 16 bytes,
+    ///   or a keychain access error occurs.
+    func get(_ account: Account) throws(KeychainError) -> UUID
+    
+    /// Retrieves and decodes a value of type `T` stored in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - account: The keychain account whose value should be retrieved.
+    ///   - decoder: The `JSONDecoder` instance used to decode the stored data.
+    /// - Returns: A decoded instance of type `T`.
+    /// - Throws: An error if the item is not found, decoding fails, or a keychain access error occurs.
+    func get<T: Decodable>(_ account: Account, decoder: JSONDecoder) throws(KeychainError) -> T
+    
+    /// Stores raw `Data` in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The data to store in the keychain.
+    ///   - account: The keychain account under which the data will be saved.
+    /// - Throws: An error if storing the data fails.
+    func set(_ value: Data, for account: Account) throws(KeychainError)
+    
+    /// Stores a UTF-8 encoded `String` in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The string to store in the keychain.
+    ///   - account: The keychain account under which the string will be saved.
+    /// - Throws: An error if storing the string fails.
+    func set(_ value: String, for account: Account) throws(KeychainError)
+    
+    /// Stores a `UUID` in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The UUID to store in the keychain (stored in 16-byte binary format).
+    ///   - account: The keychain account under which the UUID will be saved.
+    /// - Throws: An error if storing the UUID fails.
+    func set(_ value: UUID, for account: Account) throws(KeychainError)
+    
+    /// Encodes and stores a value of type `T` in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode and store.
+    ///   - account: The keychain account under which the encoded data will be saved.
+    ///   - encoder: The `JSONEncoder` used to encode the value.
+    /// - Throws: An error if encoding or storing the value fails.
+    func set<T: Encodable>(_ value: T, for account: Account, encoder: JSONEncoder) throws(KeychainError)
+    
+    /// Deletes the keychain item associated with the specified account.
+    ///
+    /// - Parameter account: The keychain account whose stored value should be deleted.
+    /// - Note: If the item does not exist, the method completes silently without error.
+    /// - Throws: An error only if the item exists but removal fails.
+    func delete(_ account: Account) throws(KeychainError)
+}
+
+public extension KeychainStorageProtocol {
+    /// Retrieves a UTF-8 encoded string stored in the keychain for the specified account.
+    ///
+    /// - Parameter account: The account identifier used to locate the stored value.
+    /// - Returns: A string decoded from the keychain data using UTF-8 encoding.
+    /// - Throws: ``KeychainError/unexpectedData`` if the data cannot be decoded as UTF-8.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/get(_:)-2gcee``
+    ///   if reading the raw data fails.
+    func get(_ account: Account) throws(KeychainError) -> String {
+        guard let value = String(data: try get(account), encoding: .utf8) else {
+            throw KeychainError.unexpectedData
+        }
+        return value
+    }
+    
+    /// Retrieves a `UUID` stored in the keychain for the specified account.
+    ///
+    /// - Parameter account: The account identifier used to locate the stored value.
+    /// - Returns: A UUID decoded from the keychain string.
+    /// - Throws: ``KeychainError/unexpectedData`` if the stored string is missing or invalid.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/get(_:)-23z7h``
+    ///   if reading the string from the keychain fails.
+    func get(_ account: Account) throws(KeychainError) -> UUID {
+        guard let value = UUID(uuidString: try get(account)) else {
+            throw KeychainError.unexpectedData
+        }
+        return value
+    }
+    
+    /// Retrieves a value of type `T` stored in the keychain and decodes it from JSON using the given decoder.
+    ///
+    /// - Parameters:
+    ///   - account: The account identifier used to locate the stored value.
+    ///   - decoder: The `JSONDecoder` to use for decoding. Defaults to a new instance.
+    /// - Returns: A decoded instance of type `T`.
+    /// - Throws: ``KeychainError/unexpectedError(_:)`` if the data cannot be decoded into the specified type.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/get(_:)-2gcee`` if reading the raw data fails.
+    func get<T: Decodable>(
+        _ account: Account,
+        decoder: JSONDecoder = .init()
+    ) throws(KeychainError) -> T {
+        let value: Data = try get(account)
+        do {
+            return try decoder.decode(T.self, from: value)
+        } catch {
+            throw KeychainError.unexpectedError(error)
+        }
+    }
+    
+    /// Stores a UTF-8 encoded string in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The string to store.
+    ///   - account: The account identifier used as the key for storing the value.
+    /// - Throws: ``KeychainError/unexpectedData`` if the string cannot be encoded as UTF-8.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/set(_:for:)-21dla``
+    ///   if saving the data fails.
+    func set(_ value: String, for account: Account) throws(KeychainError) {
+        guard let data = value.data(using: .utf8) else {
+            throw KeychainError.unexpectedData
+        }
+        try set(data, for: account)
+    }
+    
+    /// Stores a `UUID` value as a UTF-8 encoded string in the keychain for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The UUID to store.
+    ///   - account: The account identifier used as the key for storing the value.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/set(_:for:)-6nzkf``
+    ///   if saving the data fails.
+    func set(_ value: UUID, for account: Account) throws(KeychainError) {
+        try set(value.uuidString, for: account)
+    }
+    
+    /// Stores an `Encodable` value in the keychain as JSON-encoded data for the specified account.
+    ///
+    /// - Parameters:
+    ///   - value: The value to encode and store.
+    ///   - account: The account identifier used as the key for storing the value.
+    ///   - encoder: The JSON encoder to use (default is a new instance).
+    /// - Throws: ``KeychainError/unexpectedError(_:)`` if encoding the value fails.
+    /// - Throws: Any error thrown by ``KeychainStorageProtocol/set(_:for:)-21dla``
+    ///   if saving the data fails.
+    func set<T: Encodable>(
+        _ value: T,
+        for account: Account,
+        encoder: JSONEncoder = .init()
+    ) throws(KeychainError) {
+        do {
+            let data = try encoder.encode(value)
+            try set(data, for: account)
+        } catch let error as KeychainError {
+            throw error
+        } catch {
+            throw KeychainError.unexpectedError(error)
+        }
+    }
+}

keychain-kit.xcodeproj/project.pbxproj

@@ -1,362 +0,0 @@
-// !$*UTF8*$!
-{
-	archiveVersion = 1;
-	classes = {
-	};
-	objectVersion = 50;
-	objects = {
-
-/* Begin PBXBuildFile section */
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-/* End PBXBuildFile section */
-
-/* Begin PBXFileReference section */
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-/* End PBXFileReference section */
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-/* Begin PBXNativeTarget section */
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-/* End PBXNativeTarget section */
-
-/* Begin PBXProject section */
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-			attributes = {
-				LastUpgradeCheck = 1130;
-				ORGANIZATIONNAME = mr.noone;
-				TargetAttributes = {
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-			isa = XCConfigurationList;
-			buildConfigurations = (
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-				4B08E1FE23E73380003504E1 /* Release */,
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-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-		4B08E1FF23E73380003504E1 /* Build configuration list for PBXNativeTarget "keychain-kit" */ = {
-			isa = XCConfigurationList;
-			buildConfigurations = (
-				4B08E20023E73380003504E1 /* Debug */,
-				4B08E20123E73380003504E1 /* Release */,
-			);
-			defaultConfigurationIsVisible = 0;
-			defaultConfigurationName = Release;
-		};
-/* End XCConfigurationList section */
-	};
-	rootObject = 4B08E1EE23E73380003504E1 /* Project object */;
-}

keychain-kit.xcodeproj/project.xcworkspace/contents.xcworkspacedata

@@ -1,7 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<Workspace
-   version = "1.0">
-   <FileRef
-      location = "self:keychain-kit.xcodeproj">
-   </FileRef>
-</Workspace>

keychain-kit.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist

@@ -1,8 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>IDEDidComputeMac32BitWarning</key>
-	<true/>
-</dict>
-</plist>

keychain-kit/Sources/Keychain.swift

@@ -1,88 +0,0 @@
-//
-//  Keychain.swift
-//  keychain-kit
-//
-//  Created by Aleksey Zgurskiy on 02.02.2020.
-//  Copyright © 2020 mr.noone. All rights reserved.
-//
-
-import Foundation
-
-public struct Keychain {
-  public enum Error: Swift.Error {
-    case noData
-    case unexpectedData
-    case unexpected(code: OSStatus)
-  }
-  
-  // MARK: - Inits
-  
-  public init() {}
-  
-  // MARK: - Public methods
-  
-  public func get(_ key: String) throws -> Data {
-    let query: [CFString : AnyObject] = [
-      kSecClass : kSecClassGenericPassword,
-      kSecAttrAccount : key as AnyObject,
-      kSecMatchLimit : kSecMatchLimitOne,
-      kSecReturnData : kCFBooleanTrue
-    ]
-    
-    var queryResult: AnyObject?
-    let status = withUnsafeMutablePointer(to: &queryResult) {
-      SecItemCopyMatching(query as CFDictionary, UnsafeMutablePointer($0))
-    }
-    
-    guard status != errSecItemNotFound else { throw Error.noData }
-    guard status == noErr else { throw Error.unexpected(code: status) }
-    
-    guard
-      let item = queryResult as? [CFString : AnyObject],
-      let data = item[kSecValueData] as? Data
-    else { throw Error.noData }
-    
-    return data
-  }
-  
-  public func get(_ key: String) throws -> String {
-    return String(data: try get(key), encoding: .utf8)!
-  }
-  
-  public func get<T>(_ key: String, decoder: JSONDecoder = JSONDecoder()) throws -> T where T: Decodable {
-    return try decoder.decode(T.self, from: get(key))
-  }
-  
-  public func set(_ data: Data, for key: String) throws {
-    try delete(key)
-    
-    let query: [CFString : AnyObject] = [
-      kSecClass : kSecClassGenericPassword,
-      kSecAttrAccount : key as AnyObject,
-      kSecValueData : data as AnyObject
-    ]
-    
-    let status = SecItemAdd(query as CFDictionary, nil)
-    guard status == noErr else { throw Error.unexpected(code: status) }
-  }
-  
-  public func set(_ value: String, for key: String) throws {
-    try set(value.data(using: .utf8)!, for: key)
-  }
-  
-  public func set<T>(_ value: T, for key: String, encoder: JSONEncoder = JSONEncoder()) throws where T: Encodable {
-    try set(encoder.encode(value), for: key)
-  }
-  
-  public func delete(_ key: String) throws {
-    let query: [CFString : AnyObject] = [
-      kSecClass : kSecClassGenericPassword,
-      kSecAttrAccount : key as AnyObject
-    ]
-    
-    let status = SecItemDelete(query as CFDictionary)
-    guard status == noErr  || status == errSecItemNotFound else {
-      throw Error.unexpected(code: status)
-    }
-  }
-}

keychain-kit/Support Files/Config.xcconfig

@@ -1,13 +0,0 @@
-//
-//  Config.xcconfig
-//  keychain-kit
-//
-//  Created by Aleksey Zgurskiy on 02.02.2020.
-//  Copyright © 2020 mr.noone. All rights reserved.
-//
-
-// Configuration settings file format documentation can be found at:
-// https://help.apple.com/xcode/#/dev745c5c974
-
-INFOPLIST_FILE = keychain-kit/Support Files/Info.plist
-PRODUCT_NAME = KeychainKit // $(TARGET_NAME:c99extidentifier)

keychain-kit/Support Files/Debug.xcconfig

@@ -1,12 +0,0 @@
-//
-//  Debug.xcconfig
-//  keychain-kit
-//
-//  Created by Aleksey Zgurskiy on 02.02.2020.
-//  Copyright © 2020 mr.noone. All rights reserved.
-//
-
-// Configuration settings file format documentation can be found at:
-// https://help.apple.com/xcode/#/dev745c5c974
-
-#include "Config.xcconfig"

keychain-kit/Support Files/Info.plist

@@ -1,22 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
-<plist version="1.0">
-<dict>
-	<key>CFBundleDevelopmentRegion</key>
-	<string>$(DEVELOPMENT_LANGUAGE)</string>
-	<key>CFBundleExecutable</key>
-	<string>$(EXECUTABLE_NAME)</string>
-	<key>CFBundleIdentifier</key>
-	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
-	<key>CFBundleInfoDictionaryVersion</key>
-	<string>6.0</string>
-	<key>CFBundleName</key>
-	<string>$(PRODUCT_NAME)</string>
-	<key>CFBundlePackageType</key>
-	<string>$(PRODUCT_BUNDLE_PACKAGE_TYPE)</string>
-	<key>CFBundleShortVersionString</key>
-	<string>$(MARKETING_VERSION)</string>
-	<key>CFBundleVersion</key>
-	<string>$(CURRENT_PROJECT_VERSION)</string>
-</dict>
-</plist>

keychain-kit/Support Files/Release.xcconfig

@@ -1,12 +0,0 @@
-//
-//  Release.xcconfig
-//  keychain-kit
-//
-//  Created by Aleksey Zgurskiy on 02.02.2020.
-//  Copyright © 2020 mr.noone. All rights reserved.
-//
-
-// Configuration settings file format documentation can be found at:
-// https://help.apple.com/xcode/#/dev745c5c974
-
-#include "Config.xcconfig"

keychain-kit/Support Files/keychain_kit.h

@@ -1,19 +0,0 @@
-//
-//  keychain_kit.h
-//  keychain-kit
-//
-//  Created by Aleksey Zgurskiy on 02.02.2020.
-//  Copyright © 2020 mr.noone. All rights reserved.
-//
-
-#import <Foundation/Foundation.h>
-
-//! Project version number for keychain_kit.
-FOUNDATION_EXPORT double keychain_kitVersionNumber;
-
-//! Project version string for keychain_kit.
-FOUNDATION_EXPORT const unsigned char keychain_kitVersionString[];
-
-// In this header, you should import all the public headers of your framework using statements like #import <keychain_kit/PublicHeader.h>
-
-