AM:ImportTwlBackup

Request

Index Word	Description
0	Header code [0x001C0084]
1	BufSize, must be >=0x20000.
2	u8 Operation
3	Value 0x10
4	Handle
5	BufSize<<8 | 12
6	Buffer ptr, this input buffer contains the encrypted DSiWare export banner, header, and footer.

Response

Index Word	Description
0	Header code
1	Result code

Operation Values

Value	Description
0-1	Invalid, same as values 4 and 7.
2 and 5	?
3 and 6	?
4 and 7	No importing is done here.

Description

AM module uses AMPXI:DecryptDSiWareData for decrypting each DSiWare section. After decrypting a section via that command, AM module calculates a hash over the decrypted payload data for AMPXI:ValidateDSiWareSectionMAC. The footer hash for this section is then verified by calculating a hash over the cleartext data as well.

After AM module validates the header, AM module then uses AMPXI:ValidateDSiWareMovableSedHash. The footer ECDSA verification is handled by AMPXI. The decrypted banner is written to inputbuffer+0.