use apple crypto package (delegates to CryptoKit on Apple platforms)

Package.resolved

@@ -1,5 +1,14 @@
 {
   "pins" : [
+    {
+      "identity" : "swift-crypto",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/apple/swift-crypto.git",
+      "state" : {
+        "revision" : "60f13f60c4d093691934dc6cfdf5f508ada1f894",
+        "version" : "2.6.0"
+      }
+    },
     {
       "identity" : "swiftcbor",
       "kind" : "remoteSourceControl",

Package.swift

@@ -14,14 +14,15 @@ let package = Package(
             targets: ["MdocDataModel18013"]),
     ],
     dependencies: [ 
-        .package(url: "https://github.com/valpackett/SwiftCBOR.git", branch: "master") 
+        .package(url: "https://github.com/valpackett/SwiftCBOR.git", branch: "master"),
+        .package(url: "https://github.com/apple/swift-crypto.git", "1.0.0" ..< "3.0.0"),
     ],
 
     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: "MdocDataModel18013", dependencies: ["SwiftCBOR"]),
+			name: "MdocDataModel18013", dependencies: ["SwiftCBOR", .product(name: "Crypto", package: "swift-crypto")]),
         .testTarget(
             name: "MdocDataModel18013Tests",
             dependencies: ["MdocDataModel18013"]),

Sources/MdocDataModel18013/Cose.swift

@@ -18,7 +18,7 @@ limitations under the License.
 
 import Foundation
 import SwiftCBOR
-import Security
+//
 
 extension Cose {
 	/// COSE Message Identification

Sources/MdocDataModel18013/DeviceEngagement/CoseKey.swift

@@ -14,7 +14,7 @@ See the License for the specific language governing permissions and
 limitations under the License.
 */
 
-import CryptoKit
+import Crypto
 import Foundation
 import SwiftCBOR