fix the serialization names (#299)

bindings/netstandard/ElectionGuard/ElectionGuard.Encryption.Tests/TestEncrypt.cs

@@ -21,6 +21,16 @@ namespace ElectionGuard.Encrypt.Tests
             Assert.True(deviceCreatedFromJson.ToJson().Contains("Brazil"));
 
         }
+        [Test]
+        public void Test_Device_Serialization_From_JSON_Succeeds()
+        {
+            string deviceJson = "{ \"device_id\": 91755434160, \"session_id\": 12345, \"launch_code\": 45678, \"location\": \"polling-place\" }";
+            var device = new EncryptionDevice(deviceJson);
+
+            var json = device.ToJson();
+
+            Assert.True(json.Contains("polling-place"));
+        }
 
         [Test]
         public void Test_Encrypt_Ballot_Simple_Succeeds()

src/electionguard/serialize.hpp

@@ -937,9 +937,9 @@ namespace electionguard
             {
 
                 json j = {
-                  {"deviceUuid", serializable.getDeviceUuid()},
-                  {"sessionUuid", serializable.getSessionUuid()},
-                  {"launchCode", serializable.getLaunchCode()},
+                  {"device_id", serializable.getDeviceUuid()},
+                  {"session_id", serializable.getSessionUuid()},
+                  {"launch_code", serializable.getLaunchCode()},
                   {"location", serializable.getLocation()},
                 };
 
@@ -948,9 +948,9 @@ namespace electionguard
 
             static unique_ptr<electionguard::EncryptionDevice> toObject(json j)
             {
-                auto deviceUuid = j["deviceUuid"].get<uint64_t>();
-                auto sessionUuid = j["sessionUuid"].get<uint64_t>();
-                auto launchCode = j["launchCode"].get<uint64_t>();
+                auto deviceUuid = j["device_id"].get<uint64_t>();
+                auto sessionUuid = j["session_id"].get<uint64_t>();
+                auto launchCode = j["launch_code"].get<uint64_t>();
                 auto location = j["location"].get<string>();
 
                 return make_unique<electionguard::EncryptionDevice>(deviceUuid, sessionUuid,