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| [[Category:File formats]] | | #REDIRECT [[Ticket]] |
| '''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.
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| == Structure ==
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| All of the data in the file is represented in Big Endian.
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| === Content ===
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| {| class="wikitable"
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| | align="center" style="background:#f0f0f0;"|'''Offset'''
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| | align="center" style="background:#f0f0f0;"|'''Size'''
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| | align="center" style="background:#f0f0f0;"|'''Description'''
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| |-
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| | 0x000||0x4||Signature Type
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| |-
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| | 0x004||0x100||Signature
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| |-
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| | 0x104||0x3C||Padding modulo 64
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| |-
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| | 0x140||0x40||Issuer
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| |-
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| | 0x180||0x3C||ECDH data for console-unique eShop tickets.
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| |-
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| | 0x1BC||0x3||Unknown, first u8 is 0x01.
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| |-
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| | 0x1BF||0x10||Encrypted TitleKey
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| |-
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| | 0x1CF||0x1||Unknown
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| |-
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| | 0x1D0||0x8||TicketID
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| |-
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| | 0x1D8||0x4||Ticket consoleID
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| |-
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| | 0x1DC||0x8||TitleID
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| |-
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| | 0x1E4||0x2||Unknown
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| |-
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| | 0x1E6||0x2||Ticket version
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| |-
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| | 0x1E8||0x8||Unused
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| |-
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| | 0x1F0||0x1||Unused
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| |-
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| | 0x1F1||0x1||Ticket common [[AES|keyY]] index, usually 0x1 for retail system titles.
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| |-
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| | 0x1F2||0xB2||Unused
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| |}
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| 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.
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| The titlekey is decrypted by using the [[AES]] engine with the ticket common-key keyslot where the keyY is one of 6 keyYs loaded via the keyY index stored in the ticket. AES-CBC mode is used where the IV is the big-endian titleID. Note that on a retail unit index0 is a retail keyY, while on a dev-unit index0 is the dev common-key which is a normal-key.(On retail for these keyYs, the hardware key-scrambler is used)
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| == Some facts==
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| * '''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''.
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