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[[Category:File formats]]
[[Category:File formats]]
'''CommonETicket''' (for short, '''cetk''') is a format as a ticket used to store an encrypted titlekey (using 128-Bit AES-CBC).
'''CommonETicket''' (for short, '''cetk''') is a format as a ticket used to store an encrypted titlekey (using 128-Bit AES-CBC). This format seems to be identical to DSi/Wii tickets.
== Structure ==
== Structure ==
All the data in the file represented in Big Endian.
All of the data in the file is represented in Big Endian.
=== Content ===
=== Content ===
| align="center" style="background:#f0f0f0;"|'''Description'''
| align="center" style="background:#f0f0f0;"|'''Description'''
|-
|-
| 0x000||4||Signature Type
| 0x000||0x4||Signature Type
|-
|-
| 0x454||60||Padding
| 0x004||0x100||Signature
|-
|-
| 0x490||64||IssuerCA
| 0x104||0x3C||Padding modulo 64
|-
|-
| 0x4D0||4||Unknown Mark, 00 00 00 01
| 0x140||0x40||Issuer
|-
|-
| 0x4D4||64||IssuerXS
| 0x180||0x3C||ECDH data for console-unique eShop tickets.
|-
|-
| 0x514||260||Product of Odds in Signature
| 0x1BC||0x3||Unknown, first u8 is 0x01.
|-
|-
| 0x618||4||Unknown Mark, 00 01 00 01
| 0x1BF||0x10||Encrypted TitleKey
|-
|-
| 0x61C||52||Padding (?)
| 0x1CF||0x1||Unknown
|-
|-
| 0x650||4||Signature Type
| 0x1D0||0x8||TicketID
|-
|-
| 0x654||512||Signature
| 0x1D8||0x4||Ticket consoleID
|-
|-
| 0x854||60||Padding
| 0x1DC||0x8||TitleID
|-
|-
| 0x890||64||IssuerCALevel
| 0x1E4||0x2||Unknown
|-
|-
| 0x8D0||4||Unknown Mark, 00 00 00 01
| 0x1E6||0x2||Ticket version
|-
|-
| 0x8D4||64||IssuerCAName
| 0x1E8||0x8||Unused
|-
|-
| 0x914||260||Product of Odds in Signature
| 0x1F0||0x1||Unused
|-
|-
| 0xA18||4||Unknown Mark, 00 01 00 01
| 0x1F1||0x1||Ticket common [[AES|keyY]] index, usually 0x1 for retail system titles.
|-
|-
| 0xA1C||52||Padding
| 0x1F2||0xB2||Unused
|}
|}
The Signature Type is the same const as that in [[TMD]].
The Signature Type is the same const as that in [[TMD]]. The certificate chain is located at offset 0x2A4 for tickets from CDN/SOAP, however this cert-chain is removed once the ticket is installed to NAND.
== Some facts==
== Some facts==
* '''CETK''' can be fetched through HTTP using the link to default update server, with only one word different from those of [[TMD]]s, while the 3ds use ''GetCommonETicket'' function (with SOAP).
* '''CETK''' can be fetched through HTTP using the link to default update server, using the title's [[TMD]] URL where "cetk" is used instead of "tmd" for the URL. The 3DS NIM module retrieves system tickets via SOAP request ''GetCommonETicket''.