/dev/crypto

/dev/crypto is the IOSU device node for the cryptographic engine. It can only be opened by the IOSU and it also provides a stripped down library (IOSC) that is implemented on most IOSU modules under the name "crypto_ios_interface". Requests are issued via ioctl()/ioctlv() commands which are then mapped to internal functions inside the IOS-CRYPTO process. This is done using different message queues, each one mapping a subset of commands in a jump table:

0x00: Mapped by the 3rd message queue
0x01: Mapped by the 3rd message queue
0x02: Mapped by the 4th message queue
0x03: Mapped by the 4th message queue
0x04: Mapped by the 4th message queue
0x05: Mapped by the 4th message queue
0x06: Mapped by the 3rd message queue
0x07: Mapped by the 4th message queue
0x08: Mapped by the 4th message queue
0x09: Mapped by the 3rd message queue
0x0A: Mapped by the 3rd message queue
0x0B: Mapped by the 2nd message queue | Mapped by the 4th message queue (async version)
0x0C: Mapped by the 2nd message queue
0x0D: Mapped by the 2nd message queue
0x0E: Mapped by the 4th message queue
0x0F: Mapped by the 2nd message queue | Mapped by the 4th message queue (async version)
0x10: Mapped by the 4th message queue
0x11: Mapped by the 3rd message queue
0x12: Mapped by the 4th message queue
0x13: Mapped by the 4th message queue
0x14: Mapped by the 1st message queue
0x15: Mapped by the 3rd message queue
0x16: Mapped by the 4th message queue
0x17: Mapped by the 4th message queue
0x18: Not mapped
0x19: Mapped by the 2nd message queue
0x1A: Mapped by the 2nd message queue
0x1B: Mapped by the 1st message queue
0x1C: Mapped by the 2nd message queue
0x1D: Mapped by the 1st message queue
0x1E: Mapped by the 1st message queue
0x1F: Mapped by the 4th message queue
0x20: Mapped by the 4th message queue
0x21: Mapped by the 1st message queue
0x22: Mapped by the 3rd message queue

List of functions (ioctl/ioctlv)

Command	Function	Call	Description	Notes
0x01	IOSC_CreateObject()	IOS_Ioctl(FD, 0x01, in_buf, 0x10, out_buf, 4);	Creates a new crypto object and returns a handle for it.
0x02	IOSC_DeleteObject()	IOS_Ioctl(FD, 0x02, in_buf, 4, 0, 0);	Deletes a crypto object.
0x03	IOSC_ImportSecretKey()	IOS_Ioctlv(FD, 0x03, 4, 0, vector);
0x04	keyring_deallocate_entry()	IOS_Ioctlv(FD, 0x04, 1, 3, vector);
0x05	import_pub_key()	IOS_Ioctlv(FD, 0x05, 3, 0, vector);
0x06	export_root()	IOS_Ioctlv(FD, 0x06, 1, 3, vector);
0x07	compute_shared_key()	IOS_Ioctl(FD, 0x07, in_buf, 0x10, 0, 0);
0x08	set_device_id()	IOS_Ioctlv(FD, 0x08, 2, 0, vector);
0x09	get_device_id()	IOS_Ioctlv(FD, 0x09, 1, 1, vector);
0x0A	get_key_size()	IOS_Ioctl(FD, 0x0A, in_buf, 4, out_buf, 4);
0x0B	get_key_userdata_size()	IOS_Ioctl(FD, 0x0B, in_buf, 4, out_buf, 4);
0x0C	IOSC_GenerateHash() / IOSC_GenerateHashAsync();	IOS_Ioctlv(FD, 0x0C, 3, 1, vector); / IOS_IoctlvAsync(FD, 0x0C, 3, 1, vector, queueid, message);		This function has 2 different implementations, one async and the other not.
0x0D	IOSC_Encrypt() / IOSC_EncryptAsync()	IOS_Ioctlv(FD, 0x0D, 3, 1, vector); / IOS_IoctlvAsync(FD, 0x0D, 3, 1, vector, queueid, message);		This function has 2 different implementations, one async and the other not.
0x0E	IOSC_Decrypt() / IOSC_DecryptAsync()	IOS_Ioctlv(FD, 0x0E, 3, 1, vector); / IOS_IoctlvAsync(FD, 0x0E, 3, 1, vector, queueid, message);		This function has 2 different implementations, one async and the other not.
0x0F	verify_public_key_sign()	IOS_Ioctlv(FD, 0x0F, 3, 0, vector);
0x10	IOSC_GenerateBlockMAC() / IOSC_GenerateBlockMACAsync()	IOS_Ioctlv(FD, 0x10, 4, 1, vector); / IOS_IoctlvAsync(FD, 0x10, 4, 1, vector, queueid, message);		This function has 2 different implementations, one async and the other not.
0x11	verify_cert()	IOS_Ioctlv(FD, 0x11, 2, 0, vector);
0x12	get_device_cert()	IOS_Ioctl(FD, 0x12, 0, 0, out_buf, 0x180);
0x13	set_title_key_ownership()	IOS_Ioctlv(FD, 0x13, 2, 0, vector);
0x14	get_title_key_ownership()	IOS_Ioctlv(FD, 0x14, 1, 1, vector);
0x15	IOSC_GenerateRand()	IOS_Ioctl(FD, 0x15, 0, 0, out_buf, out_size);	Generate random data of an arbitrary size.
0x16	generate_secret_key()	IOS_Ioctl(FD, 0x16, in_buf, 4, 0, 0);
0x17	sign()	IOS_Ioctlv(FD, 0x17, 2, 1, vector);
0x18	IOSC_GenerateCertificate()	IOS_Ioctlv(FD, 0x18, 2, 1, vector);
0x19	Unknown	IOS_Ioctl(FD, 0x19, ???, ???, ???, ???);		This command is not mapped by the IOS-CRYPTO process.
0x1A	odm_encrypt()	IOS_Ioctlv(FD, 0x1A, 3, 2, vector);
0x1B	odm_generate_session_key()	IOS_Ioctlv(FD, 0x1B, 3, 1, vector);
0x1C	get_security_level()	IOS_Ioctl(FD, 0x1C, 0, 0, out_buf, 4);	Gets the security level flag from the OTP.
0x1D	cryptoReadHashedBlock()	IOS_Ioctlv(FD, 0x1D, 5, 1, vector);
0x1E	read_wii_seeprom_data()	IOS_Ioctl(FD, 0x1E, 0, 0, out_buf, 0x60);	Reads the old Wii SEEPROM certificate data from OTP's bank 6.
0x1F	generate_wagonu_key()	IOS_Ioctl(FD, 0x1F, in_buf, 0x10, 0, 0);	Generates the 0x12-keyhandle keydata used to encrypt/decrypt data for Wii U to Wii U system transfers.	If in_buf is NULL, a key from SEEPROM is used. If in_buf is not NULL, then it must be a pointer to a user supplied key.
0x20	IOSC_EncryptBlocks()	IOS_Ioctlv(FD, 0x20, 3, 1, vector);	Software AES encryption, this supports multiple AES-modes (AES-CTR, ...). Used by IOS-PAD to encrypt amiibo data.
0x21	IOSC_DecryptBlocks()	IOS_Ioctlv(FD, 0x21, 3, 1, vector);	Software AES decryption version of the above ioctlv. Used by IOS-PAD to decrypt amiibo data.
0x22	set_crypto_thread_priority()	IOS_Ioctl(FD, 0x22, in_buf, 4, 0, 0);	Modifies the IOS-CRYPTO main thread's priority.
0x23	get_wagon_certificate_data()	IOS_Ioctl(FD, 0x23, in_buf, 0x10, out_buf, out_size);	Gets Wagon certificate data stored inside IOS-CRYPTO.	If the first word in in_buf is 0x00000000, a Root-CA00000003 with 0x400 bytes of size is written to out_buf. If the first word in in_buf is 0x00000001, a Root-CA00000003 MS00000012 with 0x240 bytes of size is written to out_buf.

Key object handles

The above crypto commands use key/crypto object handles. These handles can be either from IOSC_CreateObject(which can then be initialized with import_secret_key in the case of AES), or a built-in handle. The available built-in handles/keyids are listed below.

The maximum number of keyobject-handles is 0x80, hence the highest valid keyobject-handle is 0x7F. Keyobject-handles <=0x40 are reserved for built-in handles, the rest are available for user-processes. Commands which write keyobjects' keydata are only allowed to use handles with value >0x40(user-process handles).

ID	Type	Description
0x00	ECC-233	Unknown private key. Possibly vWii NG ECC key.
0x01	NONE	Unknown ID (0x04 bytes). Possibly vWii NG ID.
0x02	AES-128	Wii U NAND key.
0x03	HMAC SHA-1	Wii U NAND HMAC.
0x04	AES-128	Old Wii common key.
0x05	AES-128	Wii U RNG key. Used by commands 0x15, 0x16, 0x17 and 0x18.
0x06	AES-128	Fixed key stored in IOS-CRYPTO's data.
0x07	AES-128	Wii U SEEPROM key.
0x08	NONE	Unused.
0x09	NONE	Unused.
0x0A	NONE	Unused.
0x0B	UNK	Unknown (0x10 bytes).
0x0C	AES-128	Wii U drive key. This key is generated by decrypting the SEEPROM drive key with the Wii U SEEPROM key.
0x0D	AES-128	ARM Ancast Image (this and the below one are for all ARM-ancast images launched via IOS-MCP).
0x0E	RSA-2048 modulus	ARM Ancast Image (stored inside IOS-CRYPTO's data).
0x0F	RSA-2048 modulus	Unknown (stored inside IOS-CRYPTO's data).
0x10	AES-128	Wii U common key.
0x11	UNK	Unknown (0x10 bytes).
0x12	AES-128	WagonU and usb-storage key. This key is generated by encrypting a user supplied key or the SEEPROM 0x12-keyhandle key with a key from the OTP.
0x13	AES-128	Old Wii NAND key.
0x14	HMAC SHA-1	Old Wii NAND HMAC.
0x15	AES-128	vWii common key.
0x16	AES-128	Key to encrypt DRH WLAN data.
0x17	AES-128	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (used by IOS-NET).
0x18	AES-128	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (used by IOS-NET).
0x19	AES-128	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (used by IOS-ACP).
0x1A	UNK	Unknown (0x10 bytes).
0x1B	AES-128	Key to encrypt/decrypt SSL RSA key.
0x1C	UNK	Unknown (0x1E bytes).
0x1D	UNK	Unknown (0x1E bytes).
0x1E	AES-128	Unknown (used by IOS-NET).
0x1F	AES-128	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (used by IOS-NIM-BOSS).
0x20	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x40 bytes).
0x21	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x40 bytes).
0x22	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x40 bytes).
0x23	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x40 bytes).
0x24	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x10 bytes).
0x25	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x10 bytes).
0x26	UNK	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (0x10 bytes).
0x27	AES-128	Unknown. Generated by XORing the Wii U XOR key and static data inside IOS-CRYPTO (used by IOS-NIM-BOSS).
0x28	AES-128	Devkit key. This unknown key is only generated in devkit units by decrypting the SEEPROM devkit key with a key from the OTP, or by taking a different key from the OTP if the SEEPROM one is not set.
0x29 to 0x40	UNK	Unused.