Add method to push a platform key to the pkstore

Description

This MR adds a method to push a platform key to the pkstore

Related Issue

Motivation and Context

How Has This Been Tested?

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

goKMS/kms/kms.go

@@ -355,25 +355,7 @@ func (kms *KMS) AssignForwardingRoute(pId, pHop, nHop string, remoteKMS *RemoteK
 		processId := uuid.New()
 
 		// update PKStore
-		kms.PKStoreMutex.Lock()
-		keys, ok := kms.PKStore[tmpRoute.RemoteKMS.Id]
-		if !ok {
-			kms.PKStore[tmpRoute.RemoteKMS.Id] = map[uuid.UUID]*PlatformKey{
-				pathId: {
-					Id:        pk.ID,
-					Value:     pk.Key,
-					ProcessId: processId.String(),
-				},
-			}
-		} else {
-			keys[pathId] = &PlatformKey{
-				Id:        pk.ID,
-				Value:     pk.Key,
-				ProcessId: processId.String(),
-			}
-		}
-		log.Debug("Current PKSTORE: ", kms.PKStore)
-		kms.PKStoreMutex.Unlock()
+		kms.AddSpecificPlatformKey(tmpRoute.RemoteKMS.Id, pathId, processId, pk)
 
 		remoteKMSAdrress := fmt.Sprintf("%s:%d", remoteKMS.Address, remoteKMS.Port)
 
@@ -387,6 +369,30 @@ func (kms *KMS) AssignForwardingRoute(pId, pHop, nHop string, remoteKMS *RemoteK
 	return nil
 }
 
+func (kms *KMS) AddSpecificPlatformKey(remoteKMSId string, pathId uuid.UUID, processId uuid.UUID, key *crypto.Key) {
+	kms.PKStoreMutex.Lock()
+	defer kms.PKStoreMutex.Unlock()
+
+	keys, ok := kms.PKStore[remoteKMSId]
+	if !ok {
+		kms.PKStore[remoteKMSId] = map[uuid.UUID]*PlatformKey{
+			pathId: {
+				Id:        key.ID,
+				Value:     key.Key,
+				ProcessId: processId.String(),
+			},
+		}
+	} else {
+		keys[pathId] = &PlatformKey{
+			Id:        key.ID,
+			Value:     key.Key,
+			ProcessId: processId.String(),
+		}
+	}
+
+	log.Debug("Current store of platform keys: ", kms.PKStore)
+}
+
 func (kms *KMS) GetSpecificPlatformKey(remoteKMSId string, keyId uuid.UUID) (*PlatformKey, error) {
 	kms.PKStoreMutex.Lock()
 	defer kms.PKStoreMutex.Unlock()