diff --git a/retail/arm9/include/gm9i/f_xy.h b/retail/arm9/include/gm9i/f_xy.h
deleted file mode 100644
index 383868e46..000000000
--- a/retail/arm9/include/gm9i/f_xy.h
+++ /dev/null
@@ -1,36 +0,0 @@
-/* f_xy.h
- *
- * This file was imported from godmode9i, but it is liely not the
- * original source. twltool uses the same file.
- *
- * If you happen to know whom to credit I'd love to add the name
- *
- * Refactored to reduce the pointer casts and remove the dependency 
- * from tonccpy.
- */
- 
-#ifndef _H_F_XY
-#define _H_F_XY
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-/************************ Constants / Defines *********************************/
-
-extern const uint8_t DSi_KEY_MAGIC[16] ;
-extern const uint8_t DSi_NAND_KEY_Y[16] ;
-extern const uint8_t DSi_ES_KEY_Y[16] ;
-extern const uint8_t DSi_BOOT2_KEY[16] ;
-
-/************************ Function Protoypes **********************************/
-
-void F_XY(uint8_t *key, const uint8_t *key_x, const uint8_t *key_y);
-void F_XY_reverse(const uint8_t *key, uint8_t *key_xy);
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif
-
diff --git a/retail/arm9/source/conf_sd.cpp b/retail/arm9/source/conf_sd.cpp
index 73771b73b..ab34f0fc2 100644
--- a/retail/arm9/source/conf_sd.cpp
+++ b/retail/arm9/source/conf_sd.cpp
@@ -33,7 +33,6 @@
 #include "version.h"
 
 #include "nandio.h"
-#include "f_xy.h"
 #include "dsi.h"
 #include "u128_math.h"
 
@@ -49,6 +48,15 @@
 
 struct IgmText *igmText = (struct IgmText *)INGAME_MENU_LOCATION;
 
+const uint8_t DSi_KEY_MAGIC[16] = { 0x79, 0x3e, 0x4f, 0x1a, 0x5f, 0x0f, 0x68, 0x2a,
+                                    0x58, 0x02, 0x59, 0x29, 0x4e, 0xfb, 0xfe, 0xff }; 
+const uint8_t DSi_NAND_KEY_Y[16] = { 0x76, 0xdc, 0xb9, 0x0a, 0xd3, 0xc4, 0x4d, 0xbd,
+                                     0x1d, 0xdd, 0x2d, 0x20, 0x05, 0x00, 0xa0, 0xe1 };
+const uint8_t DSi_ES_KEY_Y[16] = { 0xe5, 0xcc, 0x5a, 0x8b, 0x56, 0xd0, 0xc9,0x72,
+                                   0x9c, 0x17, 0xe8, 0xdc, 0x39, 0x12, 0x36, 0xa9 };
+const uint8_t DSi_BOOT2_KEY[16] = { 0x98, 0xee, 0x80, 0x80, 0x00, 0x6c, 0xb4, 0xf6,
+                                    0x3a, 0xc2, 0x6e, 0x62, 0xf9, 0xec, 0x34, 0xad };
+
 void decrypt_modcrypt_area(dsi_context* ctx, u8 *buffer, unsigned int size)
 {
 	uint32_t len = size / 0x10;
diff --git a/retail/arm9/source/gm9i/f_xy.c b/retail/arm9/source/gm9i/f_xy.c
deleted file mode 100644
index e07c796a3..000000000
--- a/retail/arm9/source/gm9i/f_xy.c
+++ /dev/null
@@ -1,50 +0,0 @@
-/* f_xy.c
- *
- * This file was imported from godmode9i, but it is liely not the
- * original source. twltool uses the same file.
- *
- * If you happen to know whom to credit I'd love to add the name
- *
- * Refactored to reduce the pointer casts and remove the dependency 
- * from tonccpy.
- */
-
-#include <string.h>
-#include <stdint.h>
-#include "u128_math.h"
-
-
-/************************ Constants / Defines *********************************/
-
-const uint8_t DSi_KEY_MAGIC[16] = { 0x79, 0x3e, 0x4f, 0x1a, 0x5f, 0x0f, 0x68, 0x2a,
-                                    0x58, 0x02, 0x59, 0x29, 0x4e, 0xfb, 0xfe, 0xff }; 
-const uint8_t DSi_NAND_KEY_Y[16] = { 0x76, 0xdc, 0xb9, 0x0a, 0xd3, 0xc4, 0x4d, 0xbd,
-                                     0x1d, 0xdd, 0x2d, 0x20, 0x05, 0x00, 0xa0, 0xe1 };
-const uint8_t DSi_ES_KEY_Y[16] = { 0xe5, 0xcc, 0x5a, 0x8b, 0x56, 0xd0, 0xc9,0x72,
-                                   0x9c, 0x17, 0xe8, 0xdc, 0x39, 0x12, 0x36, 0xa9 };
-const uint8_t DSi_BOOT2_KEY[16] = { 0x98, 0xee, 0x80, 0x80, 0x00, 0x6c, 0xb4, 0xf6,
-                                    0x3a, 0xc2, 0x6e, 0x62, 0xf9, 0xec, 0x34, 0xad };
-
-/************************ Functions *******************************************/
-
-void F_XY(uint8_t *key, const uint8_t *key_x, const uint8_t *key_y)
-{
-	uint8_t key_xy[16];
-
-	for(int i=0; i<16; i++)
-    key_xy[i] = key_x[i] ^ key_y[i];
-
-  memcpy(key, DSi_KEY_MAGIC, sizeof(DSi_KEY_MAGIC));
-
-	u128_add(key, key_xy);
-	u128_lrot(key, 42);
-}
-
-//F_XY_reverse does the reverse of F(X^Y): takes (normal)key, and does F in reverse to generate the original X^Y key_xy.
-void F_XY_reverse(const uint8_t *key, uint8_t *key_xy)
-{
-	memcpy(key_xy, key, 16);
-	u128_rrot(key_xy, 42);
-	u128_sub(key_xy, DSi_KEY_MAGIC);
-}
-