diff --git a/src/structs.h b/src/structs.h
index 55a859b..7de0d9e 100644
--- a/src/structs.h
+++ b/src/structs.h
@@ -2771,11 +2771,24 @@
 # define CRYPT_M_BF	1
 # define CRYPT_M_BF2	2
 # define CRYPT_M_SOD    3
-# define CRYPT_M_COUNT	4 // number of crypt methods
+# define CRYPT_M_SOD2   4
+# define CRYPT_M_COUNT	5 // number of crypt methods
 
 // Currently all crypt methods work inplace.  If one is added that isn't then
 // define this.
 # define CRYPT_NOT_INPLACE 1
+
+// Struct for passing arguments down to the crypt_init functions
+typedef struct {
+    char_u	*cat_salt;
+    int		cat_salt_len;
+    char_u	*cat_seed;
+    int		cat_seed_len;
+    char_u	*cat_add;
+    int		cat_add_len;
+    int		cat_init_from_file;
+} crypt_arg_T;
+
 #endif
 
 #ifdef FEAT_PROP_POPUP