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Line 1: − + − An example .CIA can be downloaded [https://dl.dropbox.com/u/60710927/CTR/Sample/CIA.7z here] Credit: [[User:Jl12|Jl12]]. It includes a .cia file, the result of installation, some screenshots. Everything is decrypted/extracted for convenience sake.+ − − Line 11:
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Line 16: − − The CIA format is capable of containing more then one NCCH in the APP data, the TMD specifies the size of each NCCH contained in the APP data. Generally it will only contain additional NCCH files (.[[NCCH#CFA|CFA]] format, such as the Manual and DLP Child) related to the main executable NCCH (.[[NCCH#CXI|CXI]] format). The CIA format could be interpreted as an installable variant of the [[NCSD|CCI]] format. Line 47:
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no edit summary
[[Category:File formats]]
[[Category:File formats]]
== Overview ==
== Overview ==
CIA stands for '''C'''TR '''I'''mportable '''A'''rchive. This format allows the installation titles to the 3DS. CIA files can compile [[NCCH]] files for installation to either the SDMC or CTR NAND. CIA files can also compile .SRL files (format for DS(i) executable images) for installation to the TWL NAND of the 3DS.
CIA stands for '''C'''TR '''I'''mportable '''A'''rchive. This format allows the installation titles to the 3DS. CIA files and titles on [[Title list|Nintendo's CDN]] contain identical data. As a consequence, valid CIA files can be generated from CDN content. This also means CIA files can contain anything that titles on Nintendo's CDN can contain.
Under normal circumstances CIA files are used where downloading a title is impractical or not possible. Such as distributing a [[Download Play]] child, or installing forced Gamecard updates. Those CIA(s) are stored by the titles in question, in an auxiliary [[NCCH#CFA|CFA]] file.
[[Download Play]] child CFAs contain a CIA, which contains the Download Play child title. System Update CFAs from gamecards and Download Play also contain CIAs. On retail, CIAs are only used with Download Play child CFAs and System Update CFAs.
Development Units, are capable of manually installing CIA files via the [[3DS Development Unit Software#Dev Menu|Dev Menu]].
Development Units, are capable of manually installing CIA files via the [[3DS Development Unit Software#Dev Menu|Dev Menu]].
== Format ==
== Format ==
This is the current version of the CIA format. It was finalised in late 2010. (Older versions of the CIA format can be viewed on the Talk page)
This is the current version of the CIA format, it was finalised in late 2010. (Older versions of the CIA format can be viewed on the [[Talk:CIA|Talk]] page)
The CIA format has a similar structure to the [http://wiibrew.org/wiki/Wad WAD format].
The CIA format has a similar structure to the [http://wiibrew.org/wiki/Wad WAD format].
The data is aligned in 64 byte blocks (if a content ends at the middle of the block, the next content will begin from a new block).
The data is aligned in 64 byte blocks (if a content ends at the middle of the block, the next content will begin from a new block).
=== CIA Header ===
=== CIA Header ===
| 0x0C
| 0x0C
| 0x04
| 0x04
| [[CommonETicket|Ticket]] size
| [[Ticket]] size
|-
|-
| 0x10
| 0x10
|-
|-
| 0x20
| 0x20
| 0x01
| 0x2000
| Magic? Must be = 0x80
| Content Index
|}
|}
The APP data (NCCH/SRL) is encrypted, using 128-bit AES-CBC. The encryption uses the decrypted titlekey of the ticket, and the titleid padded with zeros as the IV. To get the decrypted titlekey, the titlekey stored in the ticket must be decrypted using 128-bit AES-CBC with the 3DS common key, and the same IV as mentioned previously.
The APP data (NCCH/SRL) is encrypted, using 128-bit AES-CBC. The encryption uses the decrypted titlekey of the ticket, and the titleid padded with zeros as the IV. To get the decrypted titlekey, the titlekey stored in the ticket must be decrypted using 128-bit AES-CBC with the 3DS common key, and the same IV as mentioned previously.
=== Certificate Chain ===
There are three [[Certificates|certificates]] in this chain:
{| class="wikitable" border="1"
|-
! CERTIFICATE
! SIGNATURE TYPE
! RETAIL CERT NAME
! DEBUG CERT NAME
! DESCRIPTION
|-
| CA
| RSA-4096
| CA00000003
| CA00000004
| Used to verify the Ticket/TMD Certificates
|-
| Ticket
| RSA-2048
| XS0000000c
| XS00000009
| Used to verify the Ticket signature
|-
| TMD
| RSA-2048
| CP0000000b
| CP0000000a
| Used to verify the TMD signature
|}
The CA certificate is issued by 'Root', the public key for which is stored in NATIVE_FIRM.
=== Meta ===
=== Meta ===
|-
|-
| 0x180
| 0x180
| 0x280
| 0x180
| Reserved/Unused
| Reserved
|-
| 0x300
| 0x4
| Core Version
|-
| 0x304
| 0xFC
| Reserved
|-
|-
| 0x400
| 0x400
* [https://github.com/3dshax/ctr/tree/master/ctrtool ctrtool] - Reading/Extraction of CIA files. This can only decrypt the title-key for development CIAs, since retail CIAs use the [[AES]] hardware key-scrambler for the common-key keyslot.
* [https://github.com/3dshax/ctr/tree/master/ctrtool ctrtool] - Reading/Extraction of CIA files. This can only decrypt the title-key for development CIAs, since retail CIAs use the [[AES]] hardware key-scrambler for the common-key keyslot.
* [https://github.com/ctrdev/ctrsdk/tree/master/tools/make_cia make_cia] - Generating CIA files. Requires CommonKey and ticket/TMD RSA-2048 private exponents.
* [https://github.com/ctrdev/ctrsdk/tree/master/tools/make_cdn_cia make_cdn_cia] - (CMD)(Windows/Linux) Generates CIA files from CDN Content
== Title Key Encryption ==
== Title Key Encryption ==