Difference between revisions of "CommonETicket"

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[[Category:File formats]]
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#REDIRECT [[Ticket]]
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'''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||Signature Padding, aligning end of signature to 0x40 bytes
 
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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 title version, this title version is also stored in the [[TMD]].
 
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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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| 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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| 0x2A4||0x30||Unknown
 
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| 0x2D4||0x7C||Unused
 
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|}
 
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The Signature Type is the same const as that in [[TMD]].
 
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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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== Certificate Chain ==
 
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Tickets retrieved from CDN/SOAP have a [[Certificates|certificate]] chain appended at the end of the file. There are two certificates in this chain:
 
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{| class="wikitable" border="1"
 
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|-
 
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!  CERTIFICATE
 
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!  SIGNATURE TYPE
 
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!  RETAIL CERT NAME
 
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!  DEBUG CERT NAME
 
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!  DESCRIPTION
 
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|-
 
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|  Ticket
 
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|  RSA-2048
 
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|  XS0000000c
 
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|  XS00000009
 
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|  Used to verify the Ticket signature
 
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|-
 
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|  CA
 
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|  RSA-4096
 
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|  CA00000003
 
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|  CA00000004
 
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|  Used to verify the Ticket Certificate
 
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|}
 
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The CA certificate is issued by 'Root', the public key for which is stored in NATIVE_FIRM.
 
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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''.
 

Latest revision as of 06:06, 25 April 2013

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