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no edit summary
* and finally followed by a read-only filesystem (RomFS).
* and finally followed by a read-only filesystem (RomFS).
The extended header contains additional information regarding access control.
The extended header contains additional information regarding access control.
The plain binary region is an area specifically stored in plaintext, mostly containing SDK library strings for identification.
The plain binary region is an area specifically stored in plaintext, mostly containing SDK library strings for identification.
The extended header, the ExeFS and the RomFS are encrypted using 128-bit AES CTR.
The extended header, the ExeFS and the RomFS are encrypted using 128-bit AES CTR.
By default encrypted regions are compressed with a LZ77 variant, then encrypted. The spec allows for both unencrypted and uncompressed regions to exist. System titles expect a fixed system key.
=== NCCH Header ===
=== NCCH Header ===
| 0x188
| 0x188
| 8
| 8
| Flags
| Flags: byte[5]-byte[7] indicate content type ( system update, application, ... ) size of media unit ( 512*2^byte[6] ) and encryption.
|-
|-
| 0x190
| 0x190
A tool for parsing this format is available [http://github.com/neimod/ctr/tree/master/ctrtool here]
A tool for parsing this format is available [http://github.com/neimod/ctr/tree/master/ctrtool here]
==== Example dependency list from the extended header ====
00850 41 50 54 3A 55 00 00 00 24 68 69 6F 46 49 4F 00 APT:U...$hioFIO.
00860 24 68 6F 73 74 69 6F 30 24 68 6F 73 74 69 6F 31 $hostio0$hostio1
00870 61 63 3A 75 00 00 00 00 62 6F 73 73 3A 55 00 00 ac:u....boss:U..
00880 63 61 6D 3A 75 00 00 00 63 65 63 64 3A 75 00 00 cam:u...cecd:u..
00890 63 66 67 3A 75 00 00 00 64 6C 70 3A 46 4B 43 4C cfg:u...dlp:FKCL
008A0 64 6C 70 3A 53 52 56 52 64 73 70 3A 3A 44 53 50 dlp:SRVRdsp::DSP
008B0 66 72 64 3A 75 00 00 00 66 73 3A 55 53 45 52 00 frd:u...fs:USER.
008C0 67 73 70 3A 3A 47 70 75 68 69 64 3A 55 53 45 52 gsp::Gpuhid:USER
008D0 68 74 74 70 3A 43 00 00 6D 69 63 3A 75 00 00 00 http:C..mic:u...
008E0 6E 64 6D 3A 75 00 00 00 6E 65 77 73 3A 75 00 00 ndm:u...news:u..
008F0 6E 77 6D 3A 3A 55 44 53 70 74 6D 3A 75 00 00 00 nwm::UDSptm:u...
00900 70 78 69 3A 64 65 76 00 73 6F 63 3A 55 00 00 00 pxi:dev.soc:U...
00910 73 73 6C 3A 43 00 00 00 79 32 72 3A 75 00 00 00 ssl:C...y2r:u...
00920 69 72 3A 55 53 45 52 00 6C 64 72 3A 72 6F 00 00 ir:USER.ldr:ro..
00930 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00940 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00950 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
00960 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
... ...
009D0 FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF FF
009E0 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................
009F0 00 03 00 00 00 00 00 00 00 00 00 00 00 00 00 02 . .............
00A00 5B 53 44 4B 2B 4E 49 4E 54 45 4E 44 4F 3A 43 54 [SDK+NINTENDO:CT