Cmep Key Ring Base

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Physical address: 0xE0058000 + 0x20 * keyring_number.

Flags: See here

Keyring information

0x0~0xFF: Slave keyrings

 Initial state: Empty keyrings.
   0x000-0x007: Empty group0 slave keyrings, for AES decryption only.
   0x008-0x00F: Empty group1 slave keyrings, any algo.
   0x010-0x01F: Empty group2 slave keyrings, for AES decryption only.
   0x020-0x02F: Empty group3 slave keyrings, any algo.
   0x030-0x07F: Empty normal keyrings, any algo.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0 0x04420001 0x04420003 Y/N Secure Modules General common keyring for crypto operation.
1 0x04420001 ? ? ?
2-7 0x00400001
8 0x049F0001 0x00810003 Y first_loader SLSK personalization key (encrypt). Derived from keyrings 0x206 or 0x207.
9 0x00800001 SLSK personalization key (decrypt). Derived from keyrings 0x206 or 0x207.
0xA-0xF 0x00800003 N 6 SLSK metadata decryption keys. Derived from keyrings 0x208-0x20D.
0x10 0x05020001 0x05020001 ? ? Supports decryption only.
0x11-0x1F 0x01000001 ?
0x20 0x061F0001 0x02000003 N first_loader SLSK HMAC-SHA256 Key. Derived from keyring 0x344.
0x21-0x24 0x061F0001 ? N/A Supports encryption and decryption.
0x25-0x2F 0x02000001 ?
0x30-0x34 0x041F0001 0x041F0001
0x35-0x7F 0x00000001
0x80-0xFF 0x00000000 0x00000000 Not exist.

0x100~0x1FF: Slave keyrings (Reserved)

 Initial state: Empty keyrings.
   0x100-0x17F: Empty normal keyrings, any algo.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x100 0x041F0001 0x041F0001 ? ? ?
0x101-0x17F 0x00000001
0x180-0x1FF 0x00000000 0x00000000 N/A Not exist.

0x200~0x2FF: Master keyrings

 Initial state: Filled in, key material.
   0x200-0x203: AES decryption-only keys (for memory buffers).
   0x204-0x205: Master keys (for group0), any algo.
   0x206-0x20D: Master keys (for group1), any algo.
   0x20E-0x20F: Emmc keys, fully protected.
   0x210-0x217: General purpose keys (for memory buffers).
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x200-0x203 0x00020003 0x00000003 ? ? ?
0x204 0x006F0003 0x006F0003 Y Bigmac AES-256 master key for IdStorage Certificates AES-128-ECB keys derivation. Used by KIRK commands 0x10, 0x12, 0x17 and 0x19.
0x205 ?
0x206 0x00AF0003 0x00A00003 ? Master key used to derive key used to decrypt personalized layer over SLSK. Should be per-console.
0x207 Master key used instead of keyring 0x206 when first_loader secret debug mode is set. (Possibly non-per-console?)
0x208-0x20D N 6 master keys used to derive AES-128-CBC Key to decrypt SLSK metadata. Which one is used depends on encryption key revision in SLSK header.
0x20E 0xXXXX0003 0x00100003 ? Maybe per-console eMMC crypto keys. Protected by second_loader.
0x20F Maybe per-console eMMC crypto keys. Protected by first_loader.
0x210-0x211 0x001F0003 0x00000003 ? ? ?
0x212 0x001F0003 Y Bigmac AES-256-CMAC key used by KIRK commands 0x12 and 0x19.
0x213 AES-256-CBC key used to derive (by seed encryption) SMI keys in second_loader, which are used for minimum firmware version decryption.
0x214 0x00000003 ? ? AES-256-CBC key used to derive (by seed encryption) keyrings 0x514 and 0x515 in second_loader. IVs and seeds hardcoded in second_loader.
0x215 ?
0x216 0x001F0003 Y Bigmac AES-256-CBC key used to derive (by seed encryption) keyrings 0x502-0x504 in second_loader. IV hardcoded in second_loader. If SMI minimum FW < 0.996, this key is not used and keyrings 0x502-0x504 are set with hardcoded values from second_loader.
0x217 0x00000003 ? ? ?
0x218-0x2FF 0x00000000 0x00000000 X N/A Not exist.

0x300~0x3FF: Master keyrings 2

 Initial state: Filled in, key material.
   0x300-0x33F: AES decryption-only keys (for memory buffers).
   0x340-0x343: Master keys (for group2), any algo.
   0x344-0x353: Master keys (for group3), any algo.
   0x354-0x3FF: General purpose keys (for memory buffers).
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x300-0x33F 0x00020003 0x00000003 ? ? ?
0x340 0x012F0003 0x012F0003 ? ? Used to decrypt keys into the 0x10 keyring.
0x341-0x343 0x012F0003 0x01200003 ? ? ?
0x344 0x022F0003 0x02200003 ? ? Master key used to derive the 0x20 keyring in first_loader.
0x345-0x348 0x022F0003 0x022F0003 ? ? Used to decrypt keys into one of the 0x21-0x24 keyrings.
0x349-0x353 0x022F0003 0x02200003 ? ? ?
0x354-0x3FF 0x001F0003 0x00000003 ? ? ?

0x400~0x4FF: RW storage keyrings (Reserved)

 Initial state: Empty data storage, read-write from keyring.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x400-0x47F 0x18000001 0x00000001 ? ? ?
0x480-0x4FF 0x00000000 0x00000000 X N/A Not exist.

0x500~0x5FF: RW storage keyrings

 Initial state: Empty data storage, read-write from keyring.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x500 0x18000001 0x18000001 ? ? ?
0x501 0x18000001? 0x10000007 N first_loader Used by first_loader to figure out whether to load from eMMC or ARM comms after reset. Also SLSK AES Key revision on offset>0x1C-byte>bit:0xF0000000
0x502 0x18000001 0x18000003 Y second_loader AES XTS Tweak for Ernie SNVS sectors.
0x503 0x18000001 0x18000003 Y second_loader AES XTS Decryption Key for Ernie SNVS sectors.
0x504 0x18000001 0x18000003 Y second_loader AES-128-CMAC Key for Ernie SNVS sectors.
0x505 0x18000001 0x00000001 ? ? ?
0x506 0x18000001 0x18000003 N second_loader QAF Token AES-256-CBC and AES-256-CMAC key. Hardcoded in second_loader. Used with IV = keyring 0x507.
0x507 0x18000001 0x18000003 N second_loader QAF Token AES-256-CBC IV. Hardcoded in second_loader.
0x508 0x18000001 0x18000003 Y second_loader Ernie version. Comes from Ernie Code Flash memory (Ernie command 1). 4 bytes. If lower (older) than 0x00090903, old Ernie protocols (unencrypted SNVS packets and maybe different SNVS keys) are used.
0x509 0x18000001 0x18000003 Y second_loader ConsoleId of unit. Comes from IdStorage (eMMC).
0x50A 0x18000001? 0x18000007 Y second_loader QA flags. 0x10 bytes. Comes from Ernie NVS (Ernie command 0x1082).
0x50B 0x18000001 0x18000003 Y second_loader Mgmt Data. 8 bytes. Comes from Ernie SNVS block 0 (Ernie command 0xD2).
0x50C 0x18000001 0x18000003 N second_loader Second_Loader#Boot_type_indicator_for_slsk
0x50D 0x18000001 0x18000003 Y second_loader OpenPSID of unit. Comes from IdStorage (eMMC).
0x50E 0x18000001 1.69: 0x18000003

3.60: 0x10000003

Y second_loader Current firmware version. Comes from Ernie SNVS (Ernie command 0xD0).
0x50F 0x18000001 0x18000003 Y second_loader Minimum firmware version. Comes from IdStorage SMI leaf (eMMC). 4 bytes.
0x510 0x18000001 0x18000003 Y second_loader DIP Switches. 0x20 bytes. Comes from CP and Ernie VS (Ernie command 0x90 offset 0xE0).
0x511 0x18000001 0x18000003 N (random) second_loader Ernie communication session key. Unique per boot. It is generated by a handshake with Ernie through Ernie command 0xD0. AES-128-ECB key used to enc/dec the content of Ernie secure packets. If (baryonVersion < 0x90903 && (ernieDLVersion & 0xffffff) < 0x3600) it is zeroed by second_loader. Part of SKSO data. Used by SK command 0xF01.
0x512 0x18000001? 0x18000007 N (counter) second_loader Ernie communication ticket count. Used as a challenge at the start of each secure Ernie encrypted communication, for example for SNVS read/write. On each boot it is set to a random value by second_loader. Incremented by 1 after each Ernie secure commmand usage. Part of SKSO data. Used by SK command 0xF01.
0x513 0x18000001 0x18000003 Y second_loader DRAM size. Set to 0x20000000 by default, 0x40000000 on DevKit in DevKit Memory Size mode. Determined by DIP Switches (CP).
0x514 0x18000001 0x18000003 see keyring 0x214 second_loader SKSO AES-256-CMAC key. Protected on FW 1.05. Data size 0x90 bytes. Used to verify SKSO. Used by SK command 0xF01.
0x515 0x18000001 0x18000003 see keyring 0x214 second_loader SKSO AES-128-CBC key. Protected on FW 1.05. Data size 0xA0 bytes. Hardcoded IV in second_loader and second_kernel. Used to encrypt/decrypt SKSO (the content written into keyrings 0x511, 0x512, 0x517 and 0x519). Used by SK command 0xF01.
0x516 0x18000001? 0x18000007 N second_loader Some status. Set to 0 at the start of second_loader main(). Checked for 0 before initiating communication with Ernie. 4 bytes. Used by SK command 0xF01: writes (u32)1 here after having exported the SKSO to paddr 0x4001FF00.
0x517 0x18000001 0x18000003 Y second_loader, act_sm Kit Activation status. 4 bytes. Part of SKSO data. When initializing the keyrings, this is zeroed if keyring ?0x50D? has bit8 clear (on FW 1.692). Used by SK command 0xF01.
0x518 0x18000001 0x18000003 Y second_loader Another current FW version (3.60+?). Comes from SNVS (Ernie command 0xD0).
0x519 0x18000001 0x18000003 Y? second_loader/utoken_sm Part of SKSO data. Used by SK command 0xF01. Not used (maybe zeroed) on old FWs. Used on FW 3.60.
0x51A 0x18000001 0x18000003 N (random) second_loader Coredump Encrypted Session Key (FW 2.12+). Randomized 0x20 byte key. Unique for every boot/reboot/resume. Used for Kernel coredump encryption. See KBL Param and SCECAF#Kernel_Coredump_Encrypted_ELF. Used by SK command 0x1001.
0x51B 0x18000001 0x18000003 Y second_loader Hardware Info. 4 bytes. Comes from Ernie Code Flash memory (Ernie command 5).
0x51C-0x51D 0x18000001 0x00000001 ? ? Used in update_service_sm for NVS. 4 bytes for each keyring.
0x51E-0x521 0x18000001 0x00000001 ? ? Used in update_service_sm for NVS. 4 bytes for each keyring.
0x522-0x57F 0x18000001 0x00000001 ? ? ?
0x580-0x5FF 0x00000000 0x00000000 X N/A Not exist.

0x600~0x6FF: OTP keyrings

 Initial state: Filled in data, read-only. Keyring only.
   0x603: DWORD BootromFlags.
     Bit 0~15: HasRsaRevocationKey. This is set to 0xFFFF.
     Bit   16: UseAlternativeEmmcClock
     Bit   17: might emmc clock speed option.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x600 0x10000003 0x10000003 Y Bigmac VisibleId of unit.
0x601 0x10000003 0x10000003 Y ? Copied to 0xE0020200 by second_loader in 0.931
0x602 0x10000003 0x10000003 Y Bigmac 256 bits copied to 0xE0020100 by second_loader.
0x603 0x10000003 0x10000003 Y Bigmac SLSK RSA public key has flags
0x604 0x10000003 0x10000003 ? ? ?
0x605-0x607 0x10000003 0x00000003 ? ? ?
0x608-0x6FF 0x00000000 0x00000000 X N/A Not exist.

0x700~0x7FF: SLSK RSA Public keyrings

 Initial state: Filled in data, read-only. Keyring only.
Keyring Initial flags Flags after kernel boot Per Console Set By Description
0x700-0x7FF 0x10000003 0x00000003 N Bigmac 16 RSA public keys for SLSK files. Which key is used depends on public key revision specified in SLSK header.
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