diff --git a/ugit/cli.py b/ugit/cli.py
index 8f7817b..5c6bd3c 100644
--- a/ugit/cli.py
+++ b/ugit/cli.py
@@ -18,9 +18,18 @@ def parse_args():
     init_parser = commands.add_parser("init")
     init_parser.set_defaults(func=init)
 
+    hash_object_parser = commands.add_parser("hash-object")
+    hash_object_parser.set_defaults(func=hash_object)
+    hash_object_parser.add_argument("file")
+
     return parser.parse_args()
 
 
 def init(args):
     data.init()
     print(f"Initialized empty ugit repository in {Path.cwd()}/{data.GIT_DIR}")
+
+
+def hash_object(args):
+    with open(args.file, "rb") as f:
+        print(data.hash_object(f.read()))
diff --git a/ugit/data.py b/ugit/data.py
index 6e6d553..684f1a2 100644
--- a/ugit/data.py
+++ b/ugit/data.py
@@ -1,7 +1,17 @@
 from pathlib import Path
 
+import hashlib
+
 GIT_DIR = ".ugit"
 
 
 def init():
     Path.mkdir(GIT_DIR)
+    Path.mkdir(f"{GIT_DIR}/objects")
+
+
+def hash_object(data):
+    oid = hashlib.sha1(data).hexdigest()
+    with open(f"{GIT_DIR}/objects/{oid}", "wb") as out:
+        out.write(data)
+    return oid