diff --git a/gns3server/schemas/dynamips_vm.py b/gns3server/schemas/dynamips_vm.py
index 1bfdcc50a..ee4c88839 100644
--- a/gns3server/schemas/dynamips_vm.py
+++ b/gns3server/schemas/dynamips_vm.py
@@ -57,6 +57,11 @@ VM_CREATE_SCHEMA = {
             "type": "string",
             "minLength": 1,
         },
+        "image_md5sum": {
+            "description": "checksum of the IOS image",
+            "type": "string",
+            "minLength": 1,
+        },
         "startup_config": {
             "description": "path to the IOS startup configuration file",
             "type": "string",
@@ -288,6 +293,11 @@ VM_UPDATE_SCHEMA = {
             "type": "string",
             "minLength": 1,
         },
+        "image_md5sum": {
+            "description": "checksum of the IOS image",
+            "type": "string",
+            "minLength": 1,
+        },
         "startup_config_content": {
             "description": "Content of IOS startup configuration file",
             "type": "string",
diff --git a/gns3server/schemas/iou.py b/gns3server/schemas/iou.py
index c5db5700a..63c111650 100644
--- a/gns3server/schemas/iou.py
+++ b/gns3server/schemas/iou.py
@@ -46,6 +46,10 @@ IOU_CREATE_SCHEMA = {
             "description": "Path of iou binary",
             "type": "string"
         },
+        "md5sum": {
+            "description": "Checksum of iou binary",
+            "type": "string"
+        },
         "serial_adapters": {
             "description": "How many serial adapters are connected to the IOU",
             "type": "integer"
@@ -115,6 +119,10 @@ IOU_UPDATE_SCHEMA = {
             "description": "Path of iou binary",
             "type": ["string", "null"]
         },
+        "md5sum": {
+            "description": "Checksum of iou binary",
+            "type": "string"
+        },
         "serial_adapters": {
             "description": "How many serial adapters are connected to the IOU",
             "type": ["integer", "null"]
diff --git a/gns3server/schemas/qemu.py b/gns3server/schemas/qemu.py
index 3df7242c8..90da25e9f 100644
--- a/gns3server/schemas/qemu.py
+++ b/gns3server/schemas/qemu.py
@@ -55,18 +55,34 @@ QEMU_CREATE_SCHEMA = {
         },
         "hda_disk_image": {
             "description": "QEMU hda disk image path",
-            "type": ["string", "null"],
+            "type": "string",
+        },
+        "hda_disk_image_md5sum": {
+            "description": "QEMU hda disk image checksum",
+            "type": ["string", "null"]
         },
         "hdb_disk_image": {
             "description": "QEMU hdb disk image path",
+            "type": "string",
+        },
+        "hdb_disk_image_md5sum": {
+            "description": "QEMU hdb disk image checksum",
             "type": ["string", "null"],
         },
         "hdc_disk_image": {
             "description": "QEMU hdc disk image path",
+            "type": "string",
+        },
+        "hdc_disk_image_md5sum": {
+            "description": "QEMU hdc disk image checksum",
             "type": ["string", "null"],
         },
         "hdd_disk_image": {
             "description": "QEMU hdd disk image path",
+            "type": "string",
+        },
+        "hdd_disk_image_md5sum": {
+            "description": "QEMU hdd disk image checksum",
             "type": ["string", "null"],
         },
         "ram": {
@@ -91,11 +107,19 @@ QEMU_CREATE_SCHEMA = {
             "pattern": "^([0-9a-fA-F]{2}[:]){5}([0-9a-fA-F]{2})$"
         },
         "initrd": {
+            "description": "QEMU initrd path",
+            "type": "string",
+        },
+        "initrd_md5sum": {
             "description": "QEMU initrd path",
             "type": ["string", "null"],
         },
         "kernel_image": {
             "description": "QEMU kernel image path",
+            "type": "string",
+        },
+        "kernel_image_md5sum": {
+            "description": "QEMU kernel image checksum",
             "type": ["string", "null"],
         },
         "kernel_command_line": {
@@ -166,18 +190,34 @@ QEMU_UPDATE_SCHEMA = {
         },
         "hda_disk_image": {
             "description": "QEMU hda disk image path",
-            "type": ["string", "null"],
+            "type": "string",
+        },
+        "hda_disk_image_md5sum": {
+            "description": "QEMU hda disk image checksum",
+            "type": ["string", "null"]
         },
         "hdb_disk_image": {
             "description": "QEMU hdb disk image path",
+            "type": "string",
+        },
+        "hdb_disk_image_md5sum": {
+            "description": "QEMU hdb disk image checksum",
             "type": ["string", "null"],
         },
         "hdc_disk_image": {
             "description": "QEMU hdc disk image path",
+            "type": "string",
+        },
+        "hdc_disk_image_md5sum": {
+            "description": "QEMU hdc disk image checksum",
             "type": ["string", "null"],
         },
         "hdd_disk_image": {
             "description": "QEMU hdd disk image path",
+            "type": "string",
+        },
+        "hdd_disk_image_md5sum": {
+            "description": "QEMU hdd disk image checksum",
             "type": ["string", "null"],
         },
         "ram": {
@@ -202,11 +242,19 @@ QEMU_UPDATE_SCHEMA = {
             "pattern": "^([0-9a-fA-F]{2}[:]){5}([0-9a-fA-F]{2})$"
         },
         "initrd": {
+            "description": "QEMU initrd path",
+            "type": "string",
+        },
+        "initrd_md5sum": {
             "description": "QEMU initrd path",
             "type": ["string", "null"],
         },
         "kernel_image": {
             "description": "QEMU kernel image path",
+            "type": "string",
+        },
+        "kernel_image_md5sum": {
+            "description": "QEMU kernel image checksum",
             "type": ["string", "null"],
         },
         "kernel_command_line": {