Added support for the Crypto and CommonCrypto libraries for the GenerateHashUseCase use case in the library target, so this code builds for non-apple platforms.

Package.swift

@@ -30,21 +30,21 @@ let package = Package(
         )
     ],
     dependencies: [
+        .package(url: "https://github.com/apple/swift-crypto.git", from: "3.13.0"),
         .package(url: "https://github.com/apple/swift-openapi-generator.git", from: "1.3.0"),
         .package(url: "https://github.com/apple/swift-openapi-runtime", from: "1.5.0"),
         .package(url: "https://github.com/apple/swift-openapi-urlsession", from: "1.0.2"),
-        .package(url: "https://github.com/apple/swift-crypto.git", from: "3.13.0"),
         .package(url: "https://github.com/swiftlang/swift-docc-plugin", from: "1.1.0")
     ],
     targets: [
         .target(
             name: MarvelService.target,
             dependencies: [
-                .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime"),
-                .product(name: "OpenAPIURLSession", package: "swift-openapi-urlsession"),
                 .product(name: "Crypto", package: "swift-crypto", condition: .when(platforms: [
                     .android, .linux, .openbsd, .windows
-                ]))
+                ])),
+                .product(name: "OpenAPIRuntime", package: "swift-openapi-runtime"),
+                .product(name: "OpenAPIURLSession", package: "swift-openapi-urlsession")
             ],
             path: "Sources/MarvelService",
             plugins: [

Sources/MarvelService/Internal/Use Cases/GenerateHashUseCase.swift

@@ -10,7 +10,13 @@
 //
 //===----------------------------------------------------------------------===
 
+#if canImport(CriptoKit)
 import CryptoKit
+#elseif canImport(Crypto)
+import Crypto
+#else
+import CommonCrypto
+#endif
 
 import struct Foundation.Data
 import struct Foundation.TimeInterval
@@ -51,10 +57,33 @@ struct GenerateHashUseCase {
         let stringToHash = timestamp.asString + self.privateKey + self.publicKey
         let dataToHash = Data(stringToHash.utf8)
 
+#if canImport(CriptoKit) || canImport(Crypto)
         return Insecure.MD5
             .hash(data: dataToHash)
-            .map { String(format: "%02x", $0) }
+            .map { String(format: .Format.hexadecimal, $0) }
             .joined()
+#else
+        return dataToHash
+            .withUnsafeBytes {
+                var hash = [UInt8](repeating: 0, count: Int(CC_MD5_DIGEST_LENGTH))
+                
+                CC_MD5($0.baseAddress, CC_LONG(dataToHash.count), &hash)
+                
+                return hash
+            }
+            .map { String(format: .Format.hexadecimal, $0) }
+            .joined()
+#endif
     }
     
 }
+
+// MARK: - Constants
+
+private extension String {
+    /// A namespace assigned to string format representations.
+    enum Format {
+        /// A string format for MD5 hash hexadecimal bytes.
+        static let hexadecimal = "%02x"
+    }
+}