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The Signature Type is the same const as that in [[TMD]]. The certificate chain is located at offset 0x350 for tickets from CDN/SOAP, however this cert-chain is removed once the ticket is installed to NAND.
The Signature Type is the same const as that in [[TMD]].
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)
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)
== Certificate Chain ==
Tickets retrieved from CDN/SOAP have a Certificate chain appended at the end, outside of the ticket structure(offset 0x350/0x450 depending on the size of the ticket signature). There are two certificates in this chain:
{| class="wikitable" border="1"
|-
! CERTIFICATE
! SIGNATURE TYPE
! RETAIL CERT NAME
! DEBUG CERT NAME
! DESCRIPTION
|-
| Ticket
| RSA-2048
| XS0000000c
| XS00000009
| Used to verify the Ticket signature
|-
| CA
| RSA-4096
| CA00000003
| CA00000004
| Used to verify the Ticket Certificate
|}
The CA certificate is issued by 'Root', the public key for which is stored in NATIVE_FIRM.
== Some facts==
== Some facts==
* '''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''.
* '''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''.