首先我們要建立一個Package再本地

let package = Package(
    name: "MyLibrary",
    platforms: [
        .macOS(.v14)
    ],
    products: [
        .library(
            name: "MyLibrary",
            targets: ["MyLibrary"]),
    ],
    dependencies: [
        .package(url: "https://github.com/apple/swift-homomorphic-encryption", from: "1.0.0-alpha.3"),
    ],
    targets: [
        .target(
            name: "MyLibrary",
            dependencies: [
                .product(name: "HomomorphicEncryption", package: "swift-homomorphic-encryption"),
            ]
        ),
        .testTarget(
            name: "MyLibraryTests",
            dependencies: ["MyLibrary"]),
    ]
)

然後加入apple官方的同態加密的package，明天我會在實作 但是他僅支持Mac os 不支援iOS要特別注意