diff --git a/src/KeyKeeper/PasswordStore/FileFormatConstants.cs b/src/KeyKeeper/PasswordStore/FileFormatConstants.cs
new file mode 100644
index 0000000..e76ebe2
--- /dev/null
+++ b/src/KeyKeeper/PasswordStore/FileFormatConstants.cs
@@ -0,0 +1,11 @@
+namespace KeyKeeper.PasswordStore;
+
+static class FileFormatConstants
+{
+    public const int MIN_MASTER_SALT_LEN = 8;
+    public const int MAX_MASTER_SALT_LEN = 40;
+    public const int MIN_AESKDF_ROUNDS = 10;
+    public const int MAX_AESKDF_ROUNDS = 65536;
+    public const byte ENCRYPT_ALGO_AES = 14;
+    public const byte KDF_TYPE_AESKDF = 195;
+}
\ No newline at end of file