added encryption/decryption strategy

logic/traffic.go

@@ -0,0 +1,36 @@
+package logic
+
+import (
+	"crypto/rsa"
+	"encoding/json"
+
+	"github.com/gravitl/netmaker/database"
+)
+
+type trafficKey struct {
+	Key rsa.PrivateKey `json:"key" bson:"key"`
+}
+
+// RetrieveTrafficKey - retrieves key based on node
+func RetrieveTrafficKey(nodeid string) (rsa.PrivateKey, error) {
+	var record, err = database.FetchRecord(database.TRAFFIC_TABLE_NAME, nodeid)
+	if err != nil {
+		return rsa.PrivateKey{}, err
+	}
+	var result trafficKey
+	if err = json.Unmarshal([]byte(record), &result); err != nil {
+		return rsa.PrivateKey{}, err
+	}
+	return result.Key, nil
+}
+
+// StoreTrafficKey - stores key based on node
+func StoreTrafficKey(nodeid string, key rsa.PrivateKey) error {
+	var data, err = json.Marshal(trafficKey{
+		Key: key,
+	})
+	if err != nil {
+		return err
+	}
+	return database.Insert(nodeid, string(data), database.TRAFFIC_TABLE_NAME)
+}