- goose-sec: fixed problem that CRC is calculated wrong when the first GOOSE message is sent

src/goose/goose_publisher.c

@@ -502,12 +502,6 @@ GoosePublisher_publish(GoosePublisher self, LinkedList dataSet)
 
         if (self->l2Security)
         {
-            /* calculate crc */
-            uint16_t crc = L2Security_calculateCRC16(self->buffer + self->gooseStart, 8);
-
-            self->buffer[self->gooseStart + 8] = (uint8_t)(crc / 0x100);
-            self->buffer[self->gooseStart + 9] = (uint8_t)(crc % 0x100);
-
             /* add security extension */
             secExtLength = L2Security_addSecurityExtension(self->l2Security, self->buffer,
                 self->gooseStart, self->payloadStart + self->payloadLength - self->gooseStart, GOOSE_MAX_MESSAGE_SIZE);
@@ -517,6 +511,12 @@ GoosePublisher_publish(GoosePublisher self, LinkedList dataSet)
             self->buffer[self->gooseStart + 6] = (uint8_t)((secExtLength >> 8) & 0x0f);
             self->buffer[self->gooseStart + 7] = (uint8_t)(secExtLength & 0xff);
 
+            /* calculate crc */
+            uint16_t crc = L2Security_calculateCRC16(self->buffer + self->gooseStart, 8);
+
+            self->buffer[self->gooseStart + 8] = (uint8_t)(crc / 0x100);
+            self->buffer[self->gooseStart + 9] = (uint8_t)(crc % 0x100);
+
             printf("reserved1: %02x %02x\n", self->buffer[self->gooseStart + 6], self->buffer[self->gooseStart + 7]);
         }