diff --git a/algorithms/castle_loader.py b/algorithms/castle_loader.py
new file mode 100644
index 0000000..7e477bb
--- /dev/null
+++ b/algorithms/castle_loader.py
@@ -0,0 +1,21 @@
+DESCRIPTION = "Castle Loader API hash"
+TYPE = "unsigned_int"
+TEST_1 = 420894349
+
+
+def hash(data):
+    hash_val = 0xAAAAAAAA
+    is_odd = 0
+    for _, curr_char in enumerate(data):
+        tmp = 0
+        if (is_odd & 1) != 0:
+            val1 = (hash_val << 11) & 0xFFFFFFFF
+            val2 = (curr_char ^ (hash_val >> 5)) & 0xFFFFFFFF
+            tmp = (~(val1 + val2)) & 0xFFFFFFFF
+        else:
+            val1 = (hash_val << 7) & 0xFFFFFFFF
+            val2 = (curr_char * (hash_val >> 3)) & 0xFFFFFFFF
+            tmp = (val1 ^ val2) & 0xFFFFFFFF
+        hash_val = (hash_val ^ tmp) & 0xFFFFFFFF
+        is_odd += 1
+    return hash_val