Ticket

Tickets are found in many encrypted files used by the Wii (e.g. WAD Files or Wiidiscs). They contain the encrypted AES "title key" and the Title ID of the data and are signed by a certificate from a certificate chain (which usually is the same for all titles and stored somewhere on the NAND). So far only tickets with RSA-2048 signatures have been seen. (Discs will only work with those signatures because the size of partition ticket is always 0x2a4)

File structure

Start	End	Length	Description
0x0000	0x0003	0x04	Signature type (always 0x10001 for RSA-2048)
0x0004	0x0103	0x100	Signature by a certificate's key
0x0104	0x013F	0x3C	Padding (Always 0 - everything after this field is covered by the above signature)
0x0140	0x017F	0x40	Signature issuer
0x0180	0x01BB	0x3C	ECDSA data, used to generate one-time key during install of console specific titles
0x01BC	0x01BE	0x03	Unused/Padding
0x01BF	0x01CE	0x10	Encrypted title key
0x01CF	0x01CF	0x01	Unknown
0x01D0	0x01D7	0x08	ticket_id (used as IV for title key decryption of console specific titles)
0x01D8	0x01DB	0x04	Console ID
0x01DC	0x01E3	0x08	Title ID / Initialization Vector (IV) used for AES-CBC encryption
0x01E4	0x01E5	0x02	Unknown, mostly 0xFFFF
0x01E6	0x01E7	0x02	Ticket Version
0x01E8	0x01EB	0x04	Permitted Titles Mask
0x01EC	0x01EF	0x04	Permit mask. The current disc title is ANDed with the inverse of this mask to see if the result matches the Permitted Titles Mask.
0x01F0	0x01F0	0x01	Title Export allowed using PRNG key (1 = allowed, 0 = not allowed)
0x01F1	0x01F1	0x01	Common Key index (1 = Korean Common key, 0 = "normal" Common key)
0x01F2	0x0221	0x30	Unknown. Is all 0 for non-VC, for VC, all 0 except last byte is 1.
0x0222	0x0261	0x40	Content access permissions (one bit for each content)
0x0262	0x0263	0x02	Padding (Always 0)
0x0264	0x0267	0x04	Enable time limit (1 = Enabled, 0 = Disabled)
0x0268	0x026B	0x04	Time limit (Seconds)
0x026C	0x02A3	0x38	7 more time_limit structs as above ({int enable, seconds})

To get the title key decrypt the 16 bytes at offset 0x1bf with the Common Key using the Title ID (offset 0x1dc) as the initialization vector (the last 8 bytes of the IV should be zero).