diff --git a/include/firm/format/format_rom.h b/include/firm/format/format_rom.h
index 8f8c8e56..13772acd 100644
--- a/include/firm/format/format_rom.h
+++ b/include/firm/format/format_rom.h
@@ -33,6 +33,8 @@
 #define ROM_TWL_LTD_ALIGN_SHIFT         19          // 上記の単位をビットシフトに換算
 #define ROM_TWL_ALL_NORMAL_AREA_FLAG    0x8000
 
+#define DS_DLPLAY_SIGNATURE_PADDING_SIZE    512     // DSダウンロードプレイ署名格納エリアサイズ
+
 #define DIGEST_SIZE_SHA1        20
 
 #define DEFAULT_ALIGN           512
@@ -272,8 +274,13 @@ typedef struct ROM_Header_Short
     u32     banner_twl_offset;
     u32     banner_twl_size;
 
-    // 0x0210 - 0x0220 for AES key/seed
-    u8      aes_key[ 16 ];
+    // 0x0210 - 0x0218 for AES target offset & size
+    u32     aes_target_rom_offset;
+    u32     aes_target_size;
+
+    // 0x0218 - 0x0220 for TWL rom valid size
+    u32     twl_rom_valid_size;            // ROM Original Size
+    u8      reserved_ltd_D[ 4 ];
 
     // 0x220 - 0x298 Rom Segment Digest
     u8      main_static_digest[ DIGEST_SIZE_SHA1 ];
diff --git a/include/firm/format/format_rom_certificate.h b/include/firm/format/format_rom_certificate.h
index 0a7ae854..859d40a8 100644
--- a/include/firm/format/format_rom_certificate.h
+++ b/include/firm/format/format_rom_certificate.h
@@ -27,8 +27,6 @@
 #define TWL_ROM_CERT_MAGIC_NUMBER       0x54524543      // "CERT"の文字列
 
 #define RSA_KEY_LENGTH                  ( 1024 / 8 )
-#define RSA_PUBKEY_1024_DER_MAX         0xc0            // 少しマージンをとってこの値
-#define RSA_PRVKEY_1024_DER_MAX         0x280
 #define ROM_CERT_SIGN_OFFSET            256
 
 #define ROM_HEADER_SIGN_TARGET_SIZE     0xe00
@@ -44,8 +42,8 @@ typedef struct RomCertificateHeader {
 // ROM証明書
 typedef struct RomCertificate {
     RomCertificateHeader    header;
-    u8                      reserved[ ( ROM_CERT_SIGN_OFFSET - sizeof(RomCertificateHeader) - RSA_PUBKEY_1024_DER_MAX ) ];
-    u8                      pubKey[ RSA_PUBKEY_1024_DER_MAX ];
+    u8                      reserved[ ROM_CERT_SIGN_OFFSET - sizeof(RomCertificateHeader) - RSA_KEY_LENGTH ];
+    u8                      pubKeyMod[ RSA_KEY_LENGTH ];
     u8                      sign[ RSA_KEY_LENGTH ];
 }RomCertificate;