SPL services

csrng

Cmd	Name
0	#GetRandomBytes

GetRandomBytes

Takes a type-6 buffer and fills it with random data. Same command for "spl:" and "csrng" services.

spl:

[2.0.0+] Where previously only one AES engine was utilized, there is now support for 4 of them.

[2.0.0+] When the session closes, all AES engines that were locked are automatically unlocked.

Cmd	Name	Notes
0	#GetConfig	Wrapper for GetConfig SMC.
1	#UserExpMod	Speculative name. Wrapper for ExpMod SMC.
2	#GenerateAesKek	Wrapper for GenerateAesKek SMC.
3	#LoadAesKey	Wrapper for LoadAesKey SMC.
4	#GenerateAesKey	Decrypts 0x10 bytes using AES ECB and uses LoadAesKey SMC with a fixed Y.
5	#SetConfig	Wrapper for SetConfig SMC.
7	#GetRandomBytes	Uses GetRandomBytes SMC.
9	#DecryptImportPrivkForRsaOaep	Speculative name. Wrapper for LoadRsaPublicKey SMC.
10	#DecryptRsaOaep	Speculative name. Uses PublicRsa SMC.
11	#IsDevelopment
12	#GenerateSpecificAesKey	Wrapper for GenerateSpecificAesKey SMC.
13	#DecryptPrivk	Speculative name. Wrapper for PrivateRsa SMC.
14	#DecryptAesKey	Decrypts 0x10 bytes using AES ECB and uses LoadAesKey SMC with fixed X and Y.
15	#DecryptAesCtr	Wrapper for CryptAes SMC.
16	#ComputeCmac	Wrapper for ComputeCmac SMC.
17	#DecryptImportPrivkForExpMod1	Speculative name. Wrapper for LoadRsaPrivateKey SMC.
18	#ExpMod1	Speculative name. Wrapper for UnwrapPreparedAesKey SMC.
19	#LoadPreparedAesKey	Wrapper for LoadPreparedAesKey SMC.
20	[2.0.0+] #GeneratePreparedAesKek	Wrapper for GeneratePreparedAesKek SMC.
21	[2.0.0+] #LockAesEngine
22	[2.0.0+] #UnlockAesEngine
23	[2.0.0+] #GetSplWaitEvent

GetConfig

Takes a u32 (ConfigItem), and returns a u64 (ConfigVal).

ConfigItem	Name
1	DisableProgramVerification
2	MemoryConfiguration
3	SecurityEngineIRQNumber
4	Returns 0x02?
5	HardwareType (0=Icosa, 1=Copper)
6	IsRetail
7	IsRecoveryBoot
8	DeviceId (byte7 clear)
9	BootReason
10	MemoryArrange
11	IsDebugMode
12	KernelMemoryConfiguration
13	BatteryProfile

PM checks id1 and if non-zero, calls fsp-pr SetEnabledProgramVerification(false).

PCV configures memory profiles based on id2.

Platform	Version	Revision	id2
"jetson-tx1"	"11_40800_01_V9.8.3_V1.6"	N/A	N/A
"nx-abcb"	"10_40800_NoCfgVersion_V9.8.4_V1.6"	0	0
"nx-abca2"	"10_40800_NoCfgVersion_V9.8.7_V1.6"	0	0 or 3
"nx-abca2"	"10_40800_NoCfgVersion_V9.8.7_V1.6"	1	4
"nx-abca2"	"10_40800_NoCfgVersion_V9.8.7_V1.6"	2	1
"nx-abca2"	"10_40800_NoCfgVersion_V9.8.7_V1.6"	3	2

SPL uses id3 for setting up the security engine IRQ.

NIM checks that id8 output must match the set:cal DeviceId with byte7 cleared, otherwise panic.

[3.0.0+] RO checks id11, if set then skipping NRR rsa signatures is allowed.

Kernel uses id11 to determine behavior of svcBreak positive arguments. It will break instead of just force-exiting the process which is what happens on retail. [2.0.0+] This is also used with certain debug SVCs.

Kernel reads id12 when setting up memory-related code. If bit0 is set, it will memset various allocated memory-regions with 0x58, 0x59, 0x5A ('X', 'Y', 'Z') instead of zero. This allows Nintendo devs to find uninitialized memory bugs. If bit17-16 is 0b01, the kernel assumes 6GB of DRAM instead of 4GB.

UserExpMod

Takes one type-10 (C descriptor) buffer (data_out_buf) and 3 type-9 (X descriptor) buffers (data_in_buf, exp_in_buf and mod_in_buf).

Performs asymmetric crypto with user supplied modulus and exponent.

GenerateAesKek

Takes a 16-byte EKS (Encryption Key Source) and two words (KeyGeneration and option) as input. KeyGeneration ranges from 0 to 2.

Returns a scrambled sealed KEK (Key Encryption Key used as key_x).

LoadAesKey

Takes a u32 (keyslot) and two 16-byte keys (key_x and key_y).

Sets the specified keyslot with a key generated from key_x and key_y.

[2.0.0+] Now verifies that the engine in use (0..3) is locked/owned by the current spl session, otherwise errors with 0xD21A. Previously engine was hardcoded to 0.

GenerateAesKey

Takes a 16-byte KEK (key_x) and a 16-byte encrypted key (enc_key).

Generates a new key by decrypting enc_key with a key generated from the supplied key_x and a fixed key_y.

[2.0.0+] Previously, it always used engine 0. Now it tries to allocate an engine to be used and returns 0xD01A if they're all busy. When the command is done, the engine is released.

SetConfig

Takes a u32 (ConfigItem) and a u64 (ConfigVal).

ConfigItem	Name
13	BatteryProfile

Any other ConfigItem, besides 13, can't be set.

DecryptImportPrivkForRsaOaep

Takes one type-9 (X descriptor) buffer (enc_privk_in_buf), a 16-byte KEK (key_x), a 16-byte key (key_y) and a u32 (version). version is 0 for normal keys or 1 for extended keys.

Decrypts enc_privk_in_buf with a key generated from key_x and key_y and imports it for later usage.

DecryptRsaOaep

Takes one type-10 (C descriptor) buffer (data_out_buf) and 3 type-9 (X descriptor) buffers (data_in_buf, mod_in_buf and label_hash_in_buf).

Decrypts data_in_buf into data_out_buf using the private key imported with #DecryptImportPrivkForRsaOaep and the supplied mod_in_buf. Afterwards, verifies RSA-OAEP encoding using label_hash_in_buf.

Returns an u32 (dec_data_size).

IsDevelopment

No input params.

Uses #GetConfig internally with id=6. Returns true if output from that is 0, or if the SMC returned error 2.

Returns an u8 flag for whether the system is devunit. Output flag is 0 on retail.

GenerateSpecificAesKey

Takes a 16-byte seed (key_seed) and two words (KeyGeneration and option) as input. KeyGeneration ranges from 0 to 2.

Returns a scrambled key (key_a).

DecryptPrivk

Takes one type-10 (C descriptor) buffer (dec_privk_out_buf), one type-9 (X descriptor) buffer (enc_privk_in_buf), a 16-byte KEK (key_x), a 16-byte key (key_y) and a u32 (version). version is 0 for normal keys or 1 for extended keys.

Decrypts enc_privk_in_buf into dec_privk_out_buf with a key generated from key_x and key_y.

Used by SSL-sysmodule for TLS client-privk.

DecryptAesKey

Takes a 16-byte encrypted key (enc_key) and two words (KeyGeneration and option) as input. KeyGeneration ranges from 0 to 2.

Decrypts enc_key with a key generated from fixed key_x and key_y and returns a 16-byte decrypted key (dec_key).

[2.0.0+] Introduced same engine allocation code as for #GenerateAesKey.

DecryptAesCtr

Takes a type-0x46 (B descriptor) buffer (data_out_buf), a u32 (keyslot), a type-0x45 (A descriptor) buffer (data_in_buf) and a 16-byte CTR (aes_ctr).

Decrypts data_in_buf into data_out_buf using the key set in the specified keyslot.

[2.0.0+] Verifies the engine is locked by current session.

ComputeCmac

Takes one type-9 (X descriptor) buffer (data_in_buf) and a u32 (type?).

Returns a 16-byte CMAC calculated over data_in_buf.

[2.0.0+] Verifies the engine is locked by current session.

DecryptImportPrivkForExpMod1

Takes one type-9 (X descriptor) buffer (enc_privk_in_buf), a 16-byte KEK (key_x), a 16-byte key (key_y) and a u32 (version). version is 0 for normal keys or 1 for extended keys.

Decrypts enc_privk_in_buf with a key generated from key_x and key_y and imports it for later usage.

ExpMod1

Takes 3 type-9 (X descriptor) buffers (data_in_buf, mod_in_buf and param0_in_buf).

Decrypts data_in_buf using the private key imported with #DecryptImportPrivkForExpMod1 and the supplied mod_in_buf and param0_in_buf.

Generates and returns a 16-byte key (key_z).

LoadPreparedAesKey

Takes a u32 (keyslot) and a 16-byte key (key_z).

Sets the specified keyslot with a key generated from key_z.

[2.0.0+] Verifies the engine is locked by current session.

GeneratePreparedAesKek

Takes a 16-byte EKS (Encryption Key Source).

Returns a scrambled sealed KEK (Key Encryption Key used as key_z).

LockAesEngine

Returns the id of the engine that was locked, or 0xD01A if all engines are busy. You need to lock an engine before using AES functions.

UnlockAesEngine

Takes a single u32 and unlocks the engine with that id. It must be owned by current session otherwise 0xD21A will be returned.

GetSplWaitEvent

Returns an event handle for synchronizing with the locked AES engine.