Added support to sign messages

.devcontainer/devcontainer.json

@@ -10,8 +10,8 @@
         "vscode": {
             "extensions": [
                 "sswg.swift-lang",
-                "fabiospampinato.vscode-highlight",
-                "fabiospampinato.vscode-todo-plus"
+                //"fabiospampinato.vscode-highlight",
+                //"fabiospampinato.vscode-todo-plus"
             ]
         }
     },

Sources/IoT-Simulator-Core/Classes/Devices/EdgeDevice.swift

@@ -1,4 +1,4 @@
-/* public class EdgeDevice : EdgeDeviceP {
+public class EdgeDevice : EdgeDeviceP {
     
     public let deviceID: String
     public let deviceType: DeviceType
@@ -56,8 +56,8 @@
 
         // Todo: END Add Vincenzo's implementation
         return Message(
-            msgType: MessageType, 
-            timestamp: Date, 
+            msgType: MessageType.Data, 
+            timestamp: , 
             deviceID: String, 
             location: Location3D, 
             fields: [Field], 
@@ -70,4 +70,4 @@
 
     
 
-} */
+} 

Sources/IoT-Simulator-Core/Classes/Utils/Message.swift

@@ -1,26 +1,51 @@
-import Foundation 
+import Crypto
+import Foundation
+
 public class Message {
-    
-    public let messageType : MessageType
-    public let timestamp : Date
-    public let deviceID : String
-    public let location : Location3D
-    public let fields : [Field]
-    public let signature : [UInt8]
+
+    public let messageType: MessageType
+    public let timestamp: Date
+    public let deviceID: String
+    public let location: Location3D
+    public let fields: [Field]
+    public var signature: String {
+        get{
+            return self._signature != nil ? self._signature! : "##INVALID"
+        }
+    }
+    private var _signature: String? = nil
 
     public init(
         msgType: MessageType,
-        timestamp: Date, 
+        timestamp: Date,
         deviceID: String,
         location: Location3D,
-        fields: [Field],
-        signature: [UInt8]
+        fields: [Field]
     ) {
         self.messageType = msgType
         self.timestamp = timestamp
         self.deviceID = deviceID
         self.location = location
         self.fields = fields
-        self.signature = signature
+
     }
-}
+
+    public func toData() -> Data {
+        var string: String = "" + "\(messageType)" + "\(timestamp)" + "\(deviceID)" + "\(location)"
+
+        for field in self.fields {
+            string += "\(field)"
+        }
+
+        return Data(string.utf8)
+    }
+
+    public func signMessage(key: P521.Signing.PrivateKey) {
+        do {
+            self._signature = try sign(object: self.toData(), key: key) 
+        } catch {
+            // Do nothing
+        }
+    }
+
+}

Sources/IoT-Simulator-Core/Utils/Security.swift

@@ -1,13 +1,19 @@
 import Crypto  // Equivalent to CryptoKit (more or less)
 import Foundation
 
+
 //  ------------------
 //  --- Sign ---------
 //  ------------------
 
 public func sign(string: String, key: P521.Signing.PrivateKey) throws -> String {
     let data = Data(string.utf8)
-    return try key.signature<Data>(for: data).rawRepresentation
+    return try sign(object: data, key: key)
+
+}
+
+public func sign(object: Data, key: P521.Signing.PrivateKey)throws -> String {
+    return try key.signature<Data>(for: object).rawRepresentation.base64EncodedString()
 
 }
 
@@ -17,13 +23,13 @@ public func sign(string: String, key: P521.Signing.PrivateKey) throws -> String
 //  --- Decrypt ------
 //  ------------------
 
-public func verify(signature: String, string: String, key: P521.Signing.PublicKey) throws -> Bool {
+public func verifySignature(signature: String, string: String, key: P521.Signing.PublicKey) throws -> Bool {
     let data = Data(string.utf8)
 
     let ecdsa: P521.Signing.ECDSASignature
     do {
-        let bytes = ecdsa
-        ecdsa = try P521.Signing.ECDSASignature(rawRepresentation: signature)
+        let bytes = Data(base64Encoded: signature)!
+        ecdsa = try P521.Signing.ECDSASignature(rawRepresentation: bytes)
     } catch {
         throw SecurityError.NotDecodableError
     }
@@ -31,6 +37,19 @@ public func verify(signature: String, string: String, key: P521.Signing.PublicKe
     return key.isValidSignature<Data>(ecdsa, for: data)
 }
 
+public func verifySignature(signature: String, object: Data, key: P521.Signing.PublicKey) throws -> Bool {
+    
+    let ecdsa: P521.Signing.ECDSASignature
+    do {
+        let bytes = Data(base64Encoded: signature)!
+        ecdsa = try P521.Signing.ECDSASignature(rawRepresentation: bytes)
+    } catch {
+        throw SecurityError.NotDecodableError
+    }
+
+    return key.isValidSignature<Data>(ecdsa, for: object)
+}
+
 
 
 //  ------------------

Tests/IoT-Simulator-CoreTests/IoT_Simulator_CoreTests.swift

@@ -1,7 +1,7 @@
 import Testing
 import RandomCpp
 import Foundation
-import SwiftASN1
+import Crypto
 
 @testable import IoT_Simulator_Core
 
@@ -38,9 +38,10 @@ import SwiftASN1
     let keyPath = "./Private/privateKey.pem"
     let key = try pem2key(filePath: keyPath)
 
-    let obj = [1, 2, 3] 
+    let obj = "[1, 2, 3] "
 
-    let signature = try sign(object: obj, key: key)
+    let signature = try sign(string: obj, key: key)
+    print(signature)
 
 
 }
@@ -49,10 +50,14 @@ import SwiftASN1
     let keyPath = "./Private/privateKey.pem"
     let key = try pem2key(filePath: keyPath)
 
-    let obj = "[1, 2, 3]"
+    let obj = "[1, 2, 3] "
 
-    let signature = try sign(object: obj, key: key)
+    let signature = try sign(string: obj, key: key)
+    let puKey = key.publicKey
 
-    
+    let verify = try verify(signature: signature, string: obj, key: puKey)
+    print(verify)
+    assert(verify)
 
 }
+