diff --git a/first-validation b/first-validation
new file mode 160000
index 0000000..ee92c10
--- /dev/null
+++ b/first-validation
@@ -0,0 +1 @@
+Subproject commit ee92c10e58f73c32987d04c492cb005bd6f71001
diff --git a/first_validation.py b/first_validation.py
index cfbd543..95ce270 100644
--- a/first_validation.py
+++ b/first_validation.py
@@ -31,7 +31,9 @@ def hash_for_fname(fname):
     # Convert a string filename to a Path object.
     fpath = Path(fname)
     # Your code here.
-    return 'not-really-the-hash'
+    contents = fpath.read_bytes()
+    hash_value = sha1(contents).hexdigest()
+    return hash_value
 
 
 # Fill in the function above to make the test below pass.
@@ -48,13 +50,23 @@ def check_hashes(hash_fname):
     # Directory containing hash filenames file.
     data_dir = hash_pth.parent
     # Read in text for hash filename
+    hashes_text = hash_pth.read_text()
     # Split into lines.
+    hash_text = hashes_text.split("\n")[:-1]
     # For each line:
         # Split each line into expected_hash and filename
         # Calculate actual hash for given filename.
         # Check actual hash against expected hash
         # Return False if any of the hashes do not match.
-    return False
+    for lines in hash_text:
+        line = lines.split('  ')
+        expected_hash = line[0]
+        fname = data_dir / line[1]
+        calc_hash = hash_for_fname(fname)
+        if not calc_hash == expected_hash:
+            return False
+    
+    return True
 
 
 assert check_hashes(hashes_pth), 'Check hash list does not return True'