Secure Modules Functions

Depending on the F00D SELF that is currently loaded, different commands are handled.

Request Buffer

Each request that is made sends a page aligned buffer that has a max size of a page. After as 64 byte header common to all commands, the data afterwards is specific to each command. The documentation for each command below specifies the data that goes after the header. The special command id of -1 (0xFFFFFFFF) is used to shut down the currently loaded F00D SELF.

Offset	Size	Description
0x0	0x4	Size of buffer
0x4	0x4	Command ID
0x8	0x4	Return value (output)
0xC	0x34	Unknown/Unused
0x40	Variable (max 0xFC0)	Command specific buffer

Physical Address List

A common format used in these requests is a list of physical address and size. This simple structure is defined below. See SceSysmem#get_paddr_list for information on creating this list.

Offset	Size	Description
0x0	0x4	Physical Address
0x4	0x4	Size

This data format is used when passing large buffers of data to F00D. This is because the memory manager in kernel could allocate contiguous virtual addresses that corresponds to varying physical addresses.

kprx_auth_sm.self

This is a special SELF that is found in the boot SLB2 partition. The raw (encrypted) SELF is found in secure world memory (placed there by an early bootloader). It is used to decrypt SELFs for ARM and load SELFs for F00D. The SELF header is passed into a page aligned buffer and a paddr list is generated from it.

0x10001

Parses the SELF header for decryption. The header is copied to the F00D private memory region first (on 1.69 with 0x1000 sized header, it is at 0x00811CC0 in F00D memory space.

Offset	Size	Description
0x40	0x4	Unknown
0x44	0x4	0x1 if user SELF, otherwise 0x0
0x48	0x8	0x2808000000000001LL
0x50	0x8	0xF000C000000080LL
0x58	0x8	0xFFFFFFFF00000000LL
0x60	0x10	Unknown
0x70	0x8	0xC300003800980LL
0x78	0x8	0x8009800000LL
0x80	0x8	Unknown
0x88	0x8	0xFFFFFFFF00000000LL
0x90	0x8	Unknown
0x98	0x40	Not used
0xD8	0x60	Return data (0x90 length overwriting) ?
0x138	0x10	Copy of data at 0x68
0x148	0x10	Unknown
0x158	0x4	0x10
0x15C	0xC	Unknown
0x168	0x4	SELF path code
0x16C	0x4	Unknown
0x170	0x4	Number of paddr list entries for buffer
0x174	0x4	Physical address of paddr list

SELF Path Code

This code is found by the path the SELF was loaded from. It's used by F00D to check if the SELF being loaded from an allowed partition. A path that does not start with any of the following will have 0 returned as the code. It could also be used to select the key used in decryption.

Path	Code
sd0:	1
os0:	2
vs0:	3
vd0:	4
tm0:	5
ur0:	6
host0:	7
ud0:	11
ux0:app	23
ux0:patch	24
ux0:data	25
ux0:user	0
ux0:	12
gro0:app	13
grw0:patch	14
sa0:	15
mfa0:	16
mfb0:	17
lma0:	18
lmb0:	19
lmc0:	20
lmd0:	21
pd0:	22

0x20001

Set the program segment to decrypt. This corresponds to the segment index in the ELF program headers in the SELF header passed in with the command above.

Offset	Size	Description
0x40	0x4	Segment number
0x44	0x4	Return value. 0x1 if not compressed, 0x2 is compressed.
0x48	0x8	Unknown

0x30001

Decrypt a buffer from the SELF corresponding to the program segment number passed in above. The segment is read in 0x10000 chunks and is decrypted in place (the input buffer will contain the decrypted data). A paddr list is generated from the buffer. The input buffer and output buffer can be the same.

Offset	Size	Description
0x40	0x4	Number of entries in input paddr list
0x44	0x4	Physical address of the input paddr list
0x48	0x4	Number of entries in output paddr list
0x4C	0x4	Physical address of the output paddr list

0x40001

Used by SceSblAuthMgr for decryption maybe?

Offset	Size	Description
0x40	0x100	Data Buffer (under 0x100 bytes)
0x140	0x4	Data Size - must be under 0x100
0x144	0x4	Key ID (0,1,2)
0x148	0x4	Set to 0
0x14C	0x4	Set to 0

0x50001

Used by SceSblAuthMgr to set key for decryption (?).

Offset	Size	Description
0x40	0x8-0x10	Key (64/128/196/256 bits)
0x140	0x4	Key size (in bytes)
0x144	0x4	Key ID
0x148	0x4	Slot ID
0x14C	0x4	Set to 0

0x60001

Used by SceSblAuthMgr for decryption maybe?

0x70001

Used by SceSblAuthMgr for some kind of decryption process related to ACT.DAT

0x80001

Used by SceSblAuthMgr for used by the VSH function _vshSblAuthMgrVerifySpsfo.

act_sm.self

0x2

Verify afv data

Offset	Size	Description
0x40	0x4	Magic "act\0"
0x44	0x1	Format version
0x45	0x3	Unused
0x48	0x4	Issue number (increment each activation, prevent rollback)
0x4C	0x4	Start validity time unix timestamp
0x50	0x4	End validity time unix timestamp
0x54	0x10	Activation key
0x64	0x1C	Unused
0x80	0x40	Encrypted Data (I think 0x20 byte data + 0x20 byte HMAC)

0x4

Verify activation data

Offset	Size	Description
0x40	0x4	Magic "act\0"
0x44	0x4	Issue number
0x48	0x4	Start validity time unix timestamp
0x4C	0x4	End validity time unix timestamp
0x50	0x10	Unknown (see below)

0x5

Get activation data. The returned data is sent to Syscon at offset 0x520.

Offset	Size	Description
0x40	0x4	Magic "act\0"
0x44	0x4	Issue number
0x48	0x4	Start validity time unix timestamp
0x4C	0x4	End validity time unix timestamp
0x50	0x10	Unknown (returned data)

0x7

Check if activation is valid. The activation data is read from Syscon at offset 0x520.

Offset	Size	Description
0x40	0x4	Unknown
0x44	0x4	Current time unix timestamp
0x48	0x8	Unknown
0x50	0x20	Activation data

0xA

Introduced in 2.12. Check if new activation is valid. Extended activation check with a signature. This is ran when installing a new afv.

Offset	Size	Description
0x40	0x80	Same buffer as command 0x2 (new activation data)
0xC0	0x100	Signature over new activation data
0x1C0	0x80	Same buffer as command 0x2 (previous activation data)
0x240	0x100	Signature over previous activation data
0x340	0x20	Same buffer as command 0x4 (new activation buffer from syscon)

0xB

Introduced in 2.12. Check if current activation is valid. Extended activation check with signature. This is ran on boot.

Offset	Size	Description
0x40	0x4	Unknown
0x44	0x4	Current time
0x48	0x8	Some return value
0x50	0x8	Unknown
0x58	0x20	Same buffer as command 0x4 (activation buffer from syscon)
0x78	0x80	Same buffer as command 0x2
0xF8	0x100	Signature over activation data

aimgr_sm.self

0x1

Returns 16 byte console id (used in vshSblAimgrGetConsoleId)

0x3

Used in vshSblAimgrGetVisibleId

0x2

Returns the console's OpenPSID. Also known as the "activation key" for PDEL and PTEL.

0x4

Used in vshSblAimgrGetPscode2

compat_sm.self

0x10006

Seems to be called on init and before resume of PSP

Offset	Size	Description
0x40	0x4	Unknown
0x44	0x4	Set to 0

0x20006

Offset	Size	Description
0x40	0x4	Set to 0
0x44	0x4	Set to 0

encdec_w_portability_sm.self

This seem to be used to do some kind of key derivation. May also be used as a general purpose encryption engine.

0x1000A

Encrypt data

Offset	Size	Description
0x40	0x4	Key ID (max 0x0A)
0x44	0x4	Output Length
0x48	0x20	Output
0x68	0x4	Input Length (max 0x20)
0x6C	0x20	Input
0x8C	0x10	IV

0x2000A

Decrypt data

Offset	Size	Description
0x40	0x4	Key ID (max 0xA)
0x44	0x4	Input Length (max 0x20)
0x48	0x20	Input
0x68	0x4	Output Length
0x6C	0x20	Output
0x8C	0x10	IV

Return of 0x800f0002 means invalid service ID. For encdec_w_portability_sm, only 0x1000A and 0x2000A are supported.

Return of 0x800f1716 means invalid key slot. Valid key slots are only 1-10.

gcauthmgr_sm.self

0x1000B

Offset	Size	Description
0x40	0x4	Set to 1
0x44	0x4	GC Command
0x48	0x800	GC Buffer (Input/Output)
0x848	0x4	Unknown GC param
0x84C	0x4	GC Buffer Length/Written
0x850	0x4	Set to 0

Supported GC commands and structures

0x4

Original PSP Kirk 4 service for encrypting data

Offset	Size	Description
0x0	0x4	Set to 5
0x4	0x4	0
0x8	0x4	0
0xC	0x4	Key Slot (1-0x7F not all available)
0x10	0x4	Data Length
0x14	0x7EC	Data to encrypt

0x7

Original PSP Kirk 7 service for decrypting data

Offset	Size	Description
0x0	0x4	Set to 4
0x4	0x4	0
0x8	0x4	0
0xC	0x4	Key Slot (1-0x7F not all available)
0x10	0x4	Data Length
0x14	0x7EC	Data to encrypt

0xC

Original PSP Kirk 0xC service for Generating a 160bit ECC private/public keypair. Call with an empty buffer of length 0x3C. The structure below is the return structure.

Offset	Size	Description
0x0	0x14	Private Key
0x14	0x14	Public Key X component
0x28	0x14	Public Key Y component

0xD

Original PSP Kirk 0xD service for multiplying a 160bit ECC curve point with a value. Call with a multiplier, then a x and y point value.

Offset	Size	Description
0x0	0x14	Multiplier Value
0x14	0x14	Point X component
0x28	0x14	Point Y component

Result

Offset	Size	Description
0x0	0x14	New Point X component
0x14	0x14	New Point Y component

0xE

Original PSP Kirk 0xE service for 160bit Random number generation. Call with an empty buffer, the result structure is below.

Offset	Size	Description
0x0	0x14	Cryptographic Random Number

0x10

Original PSP Kirk 0x10 service for 160bit ECC signing. Call and return structure below.

Offset	Size	Description
0x0	0x20	Encrypted private key (see kirk-engine implementation for fuse_id process for encryption)
0x20	0x14	SHA1 hash of the content you want signed

Result

Offset	Size	Description
0x0	0x14	ECC Signature R component
0x14	0x14	ECC Signature S component

0x11

Original PSP Kirk 0x11 service for 160bit ECC signature verification. Call with the below structure, then function will return pass or fail.

Offset	Size	Description
0x0	0x14	Public Key X component
0x14	0x14	Public Key Y component
0x28	0x14	SHA1 hash of the content that is signed
0x3C	0x14	ECC Signature R component
0x50	0x14	ECC Signature S component

Result

Offset	Size	Description
0x0	0x14	ECC Signature R component
0x14	0x14	ECC Signature S component

0x14

New Vita Kirk 0x14 service for Generating a 224bit ECC private/public keypair. Call with an empty buffer of length 0x54. The structure below is the return structure.

Offset	Size	Description
0x0	0x1C	Private Key
0x1C	0x1C	Public Key X component
0x38	0x1C	Public Key Y component

0x15

New Vita Kirk 0x15 service for multiplying a 224bit ECC curve point with a value. Call with a multiplier, then a x and y point value.

Offset	Size	Description
0x0	0x1C	Multiplier Value
0x1C	0x1C	Point X component
0x38	0x1C	Point Y component

Result

Offset	Size	Description
0x0	0x1C	New Point X component
0x1C	0x1C	New Point Y component

0x16

New Vita Kirk 0x16 service for 160bit Random number generation. Call with an empty buffer, the result structure is below.

Offset	Size	Description
0x0	0x1C	Cryptographic Random Number

0x17

New Vita Kirk 0x17 service. Unknown, but buffer length is 0x3C. Almost certainly a 224bit version of 0x10

0x18

New Vita Kirk 0x18 service. Unknown, but buffer length is 0x8C. Almost certainly a 224bit version of 0x11

0x19

New Vita Kirk 0x19 service. Unknown, but buffer length is 0xE8. Related to IdStorage somehow. Almost certainly a 224bit version of 0x12

0x1B

New Vita Kirk 0x1B service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data validation service with no response. Size of request is 0x53.

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x10	cmd56 packet7 chunk
0x30	0x23	cmd56 packet8 chunk

0x1C

New Vita Kirk 0x1C service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data generation service. Size of request is 0x40. Size of response is 0x33.

Request:

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x20	cmd56 packet8 chunk

Response:

Offset	Size	Description
0x00	0x01	command
0x01	0x01	unknown
0x02	0x01	size
0x03	0x30	data

0x1D

New Vita Kirk 0x1D service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data validation service with no response. Size of request is 0xA3.

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x30	cmd56 packet9 chunk
0x50	0x10	cmd56 packet13 chunk
0x60	0x43	cmd56 packet14 chunk

0x1E

New Vita Kirk 0x1E service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data generation service. Size of request is 0x51. Size of response is 0x33.

Request:

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x30	cmd56 packet9 chunk
0x50	0x01	parameter (2)

Response:

Offset	Size	Description
0x00	0x01	command
0x01	0x01	unknown
0x02	0x01	size
0x03	0x30	data

0x1F

New Vita Kirk 0x1F service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data validation service. Size of request is 0xB3. Size of response is 0x20.

Request:

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x30	cmd56 packet9 chunk
0x50	0x20	cmd56 packet15 chunk
0x70	0x43	cmd56 packet16 chunk

Response:

Offset	Size	Description
0x00	0x20	unknown

0x20

New Vita Kirk 0x20 service. This service is related to SceSdif and is used by SceSblGcAuthMgr. This service is part of SD MMC CMD56 custom initialization protocol. This is a data validation service. Size of request is 0x116. Size of response is 0x34.

Request:

Offset	Size	Description
0x00	0x20	cmd56 packet6 chunk
0x20	0x30	cmd56 packet9 chunk
0x50	0x20	cmd56 packet17 chunk
0x70	0x43	cmd56 packet18 chunk
0xB3	0x10	cmd56 packet19 chunk
0xC3	0x53	cmd56 packet20 chunk

Response:

Offset	Size	Description
0x00	0x34	unknown

0x21

New Vita Kirk 0x21 service. Unknown, but buffer length is 0x34.

0x22

New Vita Kirk 0x22 service. Unknown, but buffer length is 0x3C.

0x23

New Vita Kirk 0x23 service. Unknown, but buffer length is 0x20.

spkg_verifier_sm_w_key_2.self

0xE0002

Used to decrypt lists stored in updates. Same format as 0x40002.

update_service_sm.self

This is used by SceSblSsUpdateMgr to decrypt update packages extracted from PUP files. Both 0x40002 and 0x50002 reference buffers in the following way: an inner paddr list is generated for the buffer containing the data to encrypt/decrypt, then an outer paddr list is generated for the inner list. That means there's two levels of indirection in the paddr list.

0x10002

Verify PUP header.

0x20002

Verify PUP segment.

0x30002

Verify watermark.

0x40002

Decrypt package. Allocate a page aligned buffer and read the complete pkg file into the buffer. The buffer is decrypted in place.

Offset	Size	Description
0x40	0x8	Set to 0x0
0x48	0x8	Set to 0x1
0x50	0x14	struct paddr_list_req for Paddr list below
0x64	0x14	struct paddr_list_req for pkg buffer
0x78	Variable (max 0xF48)	Copy of paddr list for pkg buffer (contents described at 0x50)

0x50002

Re-encrypt enp files

Offset	Size	Description
0x40	0x8	Unknown/Zero
0x48	0x8	Set to 1
0x50	0x14	struct paddr_list_req for paddr list copied to 0x78. Only count field is used.
0x64	0x14	struct paddr_list_req for inner paddr list. Not used.
0x78	Variable (max 0xF88)	Paddr list to paddr list to encrypt

0xA0002

Verify additional data.