Add Swift 5.8+ package configuration for backward compatibility with old

toolchains

Package@swift-5.8.swift

@@ -0,0 +1,44 @@
+// swift-tools-version: 5.8
+
+import PackageDescription
+
+let package = Package(
+  name: "Minisign",
+  platforms: [
+    .macOS(.v10_15),
+    .iOS(.v13),
+    .visionOS(.v1),
+    .tvOS(.v13),
+    .watchOS(.v6),
+  ],
+  products: [
+    // Products define the executables and libraries a package produces, making them visible to other packages.
+    .library(
+      name: "Minisign",
+      targets: ["Minisign"]
+    )
+  ],
+  dependencies: [
+    .package(url: "https://github.com/apple/swift-crypto", from: "2.0.0"),
+    .package(url: "https://github.com/lovetodream/swift-blake2", from: "0.1.0"),
+  ],
+  targets: [
+    // Targets are the basic building blocks of a package, defining a module or a test suite.
+    // Targets can depend on other targets in this package and products from dependencies.
+    .target(
+      name: "Minisign",
+      dependencies: [
+        .product(name: "Crypto", package: "swift-crypto"),
+        .product(name: "BLAKE2", package: "swift-blake2"),
+      ],
+      swiftSettings: [
+        .define("UseSwiftCrypto")
+      ]
+    ),
+    .testTarget(
+      name: "MinisignTests",
+      dependencies: ["Minisign"]
+    ),
+  ],
+  swiftLanguageModes: [.version("6"), .v5],
+)

README.md

@@ -5,6 +5,7 @@ Swift implementation of Minisign, a simple and secure tool for signing and verif
 This is a fork of [slarew/swift-minisign](https://github.com/slarew/swift-minisign), with these improvements:
 
 - Convenient & efficient API for verifying (big) files
+- `Sendable` conformance & full Swift 6 support
 - Replaced C wrapping `swift-crypto-blake2` with [pure Swift implementation of blake2b](https://github.com/lovetodream/swift-blake2).
 - For Apple platforms, Swift Crypto dependency is now optional, controllable via trait `UseSwiftCrypto`.