SPL is responsible for handling all cryptographic operations within the system and relaying them to the Secure Monitor when necessary.
During [1.0.0-3.0.2], the only existing services were "csrng" and "spl:". However, in [4.0.0+] the "spl:" service was refactored and split into new services with different permission levels. Each service exposes the IPC command list differently in order to prevent cryptographic operations to take place in the wrong context.
csrng
This is "nn::spl::detail::IRandomInterface".
| Cmd | Name |
|---|---|
| 0 | #GetRandomBytes |
GetRandomBytes
Takes a type-6 buffer and fills it with random data from GetRandomBytes SMC. Same command for "spl:" and "csrng" services.
spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu
These are "nn::spl::detail::IGeneralInterface", "nn::spl::detail::ICryptoInterface", "nn::spl::detail::IFsInterface", "nn::spl::detail::ISslInterface", "nn::spl::detail::IEsInterface" and "nn::spl::detail::IManuInterface"(?).
[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 | Permissions |
|---|---|---|
| 0 | #GetConfig | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 1 | #UserExpMod | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 2 | #GenerateAesKek | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 3 | #LoadAesKey | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 4 | #GenerateAesKey | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 5 | #SetConfig | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 7 | #GetRandomBytes | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 9 | #LoadSecureExpModKey | spl:fs |
| 10 | #SecureExpMod | spl:fs |
| 11 | #IsDevelopment | spl:, spl:mig, spl:fs, spl:ssl spl:es, spl:manu |
| 12 | #GenerateSpecificAesKey | spl:fs |
| 13 | #DecryptRsaPrivateKey | spl:ssl, spl:es, spl:manu |
| 14 | #DecryptAesKey | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 15 | #DecryptAesCtr | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 16 | #ComputeCmac | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 17 | #LoadRsaOaepKey | spl:es |
| 18 | #UnwrapRsaOaepWrappedTitleKey | spl:es |
| 19 | #LoadTitleKey | spl:fs |
| 20 | [2.0.0+] #UnwrapAesWrappedTitleKey | spl:es |
| 21 | [2.0.0+] #LockAesEngine | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 22 | [2.0.0+] #UnlockAesEngine | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 23 | [2.0.0+] #GetSplWaitEvent | spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 24 | [3.0.0+] #SetSharedData | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 25 | [3.0.0+] #GetSharedData | spl:, spl:mig, spl:fs, spl:ssl, spl:es, spl:manu |
| 26 | [5.0.0+] ImportSslRsaKey | spl:ssl |
| 27 | [5.0.0+] SecureExpModWithSslKey | spl:ssl |
| 28 | [5.0.0+] ImportEsRsaKey | spl:es |
| 29 | [5.0.0+] SecureExpModWithEsKey | spl:es |
| 30 | [5.0.0+] EncryptManuRsaKeyForImport | spl:manu |
| 31 | [5.0.0+] GetPackage2Hash | spl:fs |
GetConfig
Wrapper for GetConfig SMC.
Takes a u32 (ConfigItem), and returns one or more u64s (ConfigVal).
| ConfigItem | Name |
|---|---|
| 1 | #DisableProgramVerification |
| 2 | #DramId |
| 3 | #SecurityEngineIrqNumber |
| 4 | #Version |
| 5 | #HardwareType |
| 6 | #IsRetail |
| 7 | #IsRecoveryBoot |
| 8 | #DeviceId |
| 9 | [1.0.0-4.0.0] #BootReason |
| 10 | #MemoryArrange |
| 11 | #IsDebugMode |
| 12 | #KernelMemoryConfiguration |
| 13 | #BatteryProfile |
| 14 | [4.0.0+] #IsKiosk |
| 15 | [5.0.0+] #NewHardwareType |
| 16 | [5.0.0+] #NewKeyGeneration |
| 17 | [5.0.0+] #Package2Hash |
DisableProgramVerification
PM checks this item and if non-zero, calls fsp-pr SetEnabledProgramVerification(false).
DramId
This is extracted directly from FUSE_RESERVED_ODM4.
| Value | Description |
|---|---|
| 0 | DramId_EristaIcosaSamsung4gb |
| 1 | DramId_EristaIcosaHynix4gb |
| 2 | DramId_EristaIcosaMicron4gb |
| 3 | Reserved |
| 4 | DramId_EristaIcosaSamsung6gb |
| 5 | [5.0.0+] Reserved |
| 6 | [5.0.0+] Reserved |
| 7 | [5.0.0+] DramId_MarikoIowax1x2Samsung4gb |
| 8 | [5.0.0+] DramId_MarikoIowaSamsung4gb |
| 9 | [5.0.0+] DramId_MarikoIowaSamsung8gb |
| 10 | [5.0.0+] Reserved |
| 11 | [5.0.0+] Reserved |
| 12 | [5.0.0+] DramId_MarikoHoagSamsung4gb |
| 13 | [5.0.0+] DramId_MarikoHoagSamsung8gb |
PCV configures memory profiles based on DramId.
| Platform | DramId | Version |
|---|---|---|
| jetson-tx1 | N/A | 11_40800_01_V9.8.3_V1.6 |
| nx-abcb | EristaIcosaSamsung4gb | 10_40800_NoCfgVersion_V9.8.7_V1.6 |
| nx-abcb | EristaIcosaMicron4gb | 10_40800_NoCfgVersion_V9.8.4_V1.6 |
| nx-abcb | EristaIcosaHynix4gb | 10_40800_NoCfgVersion_V9.8.4_V1.6 |
| nx-abca2 | EristaIcosaSamsung4gb or EristaIcosaMicron4gb | 10_40800_NoCfgVersion_V9.8.7_V1.6 |
| nx-abca2 | EristaIcosaHynix4gb | 10_40800_NoCfgVersion_V9.8.7_V1.6 |
| nx-abca2 | EristaIcosaSamsung6gb | 10_40800_NoCfgVersion_V9.8.7_V1.6 |
| nx-abca2 | MarikoIowax1x2Samsung4gb | 01_204000_NoCfgVersion_V0.3.1_V2.0 |
| nx-abca2 | MarikoIowaSamsung4gb or MarikoHoagSamsung4gb | 01_204000_NoCfgVersion_V0.3.1_V2.0 |
| nx-abca2 | MarikoIowaSamsung8gb or MarikoHoagSamsung8gb | 01_204000_NoCfgVersion_V0.4.2_V2.0 |
nx-abcb (Copper) is the SDEV unit. Among other differences, this has extra hardware to support HDMI output.
nx-abca2 (Icosa) hardware types are variations of the retail form factor.
SecurityEngineIrqNumber
SPL uses this for setting up the security engine IRQ.
Version
The current Package1 Maxver Constant - 1.
HardwareType
[1.0.0+] This item is obtained by checking bits 8 and 2 from FUSE_RESERVED_ODM4. It can be 0 (Icosa), 1 (Copper) or 3 (Invalid).
[4.0.0+] This item is obtained by checking bits 8, 2 and 16-19 from FUSE_RESERVED_ODM4. It can be 0 (Icosa), 1 (Copper), 3 (Mariko) or 4 (Invalid).
A value of 2 (Hoag?) is always mapped to 4 (Invalid).
IsRetail
This item is obtained by checking bits 9 and 0-1 from FUSE_RESERVED_ODM4. It can be 0 (Debug), 1 (Retail) or 2 (Invalid).
IsRecoveryBoot
Used to determine if the system is booting from SafeMode firmware.
DeviceId
NIM checks if this item matches the set:cal DeviceId with byte7 cleared. If they don't match, a panic is thrown.
BootReason
Used to determine how the system booted.
MemoryArrange
PM uses this item for selecting the appropriate size for each LimitableResource_Memory.
IsDebugMode
Kernel uses this 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.
[3.0.0+] RO checks this and if set then skipping NRR rsa signatures is allowed.
The value of this field is loaded from BootConfig unsigned-config+0x10 u8 bit1.
KernelMemoryConfiguration
Kernel reads this 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.
BatteryProfile
This tells if the TI Charger (bq24192) is active.
NewKeyGeneration
This item is obtained from FUSE_RESERVED_ODM2 if bit 11 from FUSE_RESERVED_ODM4 is set, FUSE_RESERVED_ODM0 matches 0x8E61ECAE and FUSE_RESERVED_ODM1 matches 0xF2BA3BB2.
[5.0.0+] FS can now use this value for the KeyGeneration parameter when calling GenerateAesKek during "GetBisEncryptionKey".
IsKiosk
This item is bit 10 from FUSE_RESERVED_ODM4.
[4.0.0+] Settings uses this value to overwrite the quest flag from GetQuestFlag. This is used to detect if a Switch is a kiosk unit for display at retail stores.
NewHardwareType
This item is currently hardcoded to 0.
[5.0.0+] PCV overrides the value from HardwareType and configures PMIC devices with this item.
| Value | Devices |
|---|---|
| 0 | max77620_sd0, max77621_cpu and max77621_gpu |
| 1 | max77620_sd0, max77812_cpu and max77812_gpu |
| 2 | max77620_sd0, max77812_cpu and max77812_gpu |
Package2Hash
This is a SHA-256 hash calculated over the package2 image. Since the hash calculation is an optional step in pkg2ldr, this item is only valid in recovery mode. Otherwise, an error is returned instead.
UserExpMod
Wrapper for ExpMod SMC.
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
Wrapper for GenerateAesKek SMC.
Takes a 16-byte EKS (Encryption Key Source) and two words (KeyGeneration and option) as input.
Returns a scrambled sealed KEK (Key Encryption Key used as key_x).
LoadAesKey
Wrapper for LoadAesKey SMC.
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 (AES-ECB) enc_key with a key generated from the supplied key_x and a fixed key_y set with LoadAesKey SMC.
[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
Wrapper for SetConfig SMC.
Takes a u32 (ConfigItem) and a u64 (ConfigVal).
| ConfigItem | Name |
|---|---|
| 13 | BatteryProfile |
Any other ConfigItem, besides 13, can't be set.
LoadSecureExpModKey
Wrapper for LoadSecureExpModKey SMC.
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.
[5.0.0+] This now calls EncryptRsaKeyForImport SMC instead.
SecureExpMod
Takes 3 type-9 (X descriptor) buffers (data_in_buf, mod_in_buf and param0_in_buf).
Uses SecureExpMod SMC to decrypt data_in_buf using the private key imported with #LoadSecureExpModKey and the supplied mod_in_buf and param0_in_buf.
Generates and returns a 16-byte sealed titlekey.
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
Wrapper for GenerateSpecificAesKey SMC.
Takes a 16-byte seed (key_seed) and two words (KeyGeneration and option) as input.
Returns a scrambled key (key_a).
DecryptRsaPrivateKey
Wrapper for DecryptRsaPrivateKey SMC.
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.
[5.0.0+] This now calls DecryptOrImportRsaKey SMC instead.
DecryptAesKey
Takes a 16-byte encrypted key (enc_key) and two words (KeyGeneration and option) as input.
Decrypts (AES-ECB) enc_key with a key generated from fixed key_x and key_y set with LoadAesKey SMC 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).
Uses CryptAes SMC to decrypt 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
Wrapper for ComputeCmac SMC.
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.
LoadRsaOaepKey
Wrapper for LoadRsaOaepKey SMC.
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.
UnwrapRsaOaepWrappedTitleKey
Wrapper for UnwrapRsaOaepWrappedTitleKey SMC.
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 #LoadRsaOaepKey and the supplied mod_in_buf. Afterwards, verifies RSA-OAEP encoding using label_hash_in_buf.
Returns an u32 (dec_data_size).
LoadTitleKey
Wrapper for LoadTitleKey SMC.
Takes a u32 (keyslot) and a 16-byte sealed titlekey.
Sets the specified keyslot with the titlekey.
[2.0.0+] Verifies the engine is locked by current session.
UnwrapAesWrappedTitleKey
Wrapper for UnwrapAesWrappedTitleKey SMC.
Takes a 16-byte EKS (Encryption Key Source).
Returns a sealed titlekey.
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.
Sets a static dword in spl .bss to the user input u32.
[4.0.0+] returns 0xD41A if a value has been previously set without being gotten.
Returns the static dword in spl .bss that can be set via #SetSharedData.
[4.0.0+] returns 0xD61A if a value has not previously been set, and unsets the value after getting it.