F00D Keyring Regs

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0xE0000000: Cmep/ARM

0xE0000000: MailboxCmepToArm

Response to ARM is written here.

0xE0000010: MailboxArmToCmep

Request from ARM is written here.

0xE0000020: MailboxCmepToDebugger

Size: 2 * DOWORD.

0xE0000028: MailboxDebuggerToCmep

Size: 2 * DWORD.

0xE0000060: MailboxDebuggerToCmep2

Size: 2 * DWORD.

0xE0010000: Cmep controller

Address Length Description
0xE0010000 4 TZ sets it to 1 then 0 and it appears cmep resets.
0xE0010004 4 Read by second_loader, checked against mask (& 5) and (& 8). Read by TZ after setting reset, checked if flag 0x80000000 is set. Ex: 0x80000005. Writing values to it from cmep does nothing.

0xE0010000: CmepReset

   Bit0: Hangs. ARM uses this to reset the cMeP subsystem.

0xE0010004: CmepStatus

   Bit31:  IsCmepAlive
   Bit0-2: ?
   0xE0010000: 00 00 00 00 05 00 00 80 00 00 00 00 00 00 00 00
   0xE0010010: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

0xE0010010: Unknown

Reads back 0x7FF. Then hangs after delay.

   Bit5: Disables Key* registers, and Cmep KeyRings.

No bit appears to disable Rsa* registers, or Bigmac*.

0xE0020000: Cmep 0xE0020000

Address Length Description
0xE0020000 4 second_loader sets it to 0x30003 after ?clearing keys?. secure_kernel sets it to 0x2000F.
0xE0020004 4 ? Error code ?. Read by second_loader, checked against 0x8000001F. Also set to ?0? by second_loader when setting 0x30003 at 0xE0020000.
0xE0020020 4 Checked for 0 by second_loader. May be a kind of timer or working state.
0xE0020040 0x10 Read As
0xE0020100 0x20 Per-console 256-bit key from keyring 0x602 is copied here by second_loader.

0xE0020000 flags

   Bit0: Reboot when cleared.
   Bit1: Makes first_loader load secure_kernel. Hang when cleared and unrecoverable.
   Bit2: No hang when cleared.
   Bit3: No hang when cleared.
   Bit4: ?
   Bit5: ?
   Bit16: Allows ARM to reset cmep. No hang when cleared.
   Bit17: ?

0xE0030000: Bigmac Keyring controller

This device is mapped to ScePervasiveResetReg at offset 0x190 for controlling reset and enabling mask writing.

typedef struct BigmacKeyringControllerRegs { // physical address 0xE0030000
	SceUInt32 keyring_new_value[8];
	SceUInt32 keyring_set_value_trigger;
	SceUInt32 keyring_clear_flags;
	SceUInt32 keyring_query_flags_request;
	SceUInt32 keyring_query_flags_response;
} BigmacKeyringControllerRegs;

0xE0030000: KeyringNewValue

Size: 8 * DWORD.

0xE0030020: KeyringSetValueTrigger

Write value to a keyring. Requires the keyring to be enabled and WriteByCmepAllowed flag to be set.

Write a keyring to this address, and the Bigmac Keyring Controller will write value from physical address 0xE0030000 to the keyring.

0xE0030024: KeyringClearFlags

Note that there is no known way to set some keyrings flags in any way (doing keyring_flags |= or_flags), even though the opposite (clearing flags) is doable for some flags.

Writing ((flags_mask<<16)|keyring_id) to keyring_clear_flags clear flags for this keyring.

   Bit0-15:  KeyringId
   Bit16-31: KeyringClearFlagsMask

0xE0030028: KeyringQueryFlags

Writing keyring_id to keyring_query_flags_request returns current flags in keyring_query_flags_response.

   Bit0-15: KeyringId

0xE003002C: KeyringQueryFlagsResponse

   Bit Mask value    Clearable   Description
   0  (0x0000 0001): N/A       | KeyringExists
   1  (0x0000 0002): N/A       | KeyringEnabled. You cannot use the keyring if this is not set.
   2  (0x0000 0004): N/A       | Unknown
   16 (0x0001 0000): Clearable | AesEncryptAllowed (CTR+CBC+ECB, any key size)
   17 (0x0002 0000): Clearable | AesDecryptAllowed (CTR+CBC+ECB, any key size)
   18 (0x0004 0000): Clearable | ShaHmacAllowed (SHA1+SHA256)
   19 (0x0008 0000): Clearable | AesCmacAllowed
   20 (0x0010 0000): Clearable | Master keyring can target memory.
   21 (0x0020 0000): Fixed     | IsMaster. Master keyring can target slave keyring (based on Mask Group below).
   22 (0x0040 0000): Fixed     | MemberOfGroup0. Keyring Pairing Lock Mask Group 0 (master keyrings 0x204-0x205 and slave keyrings 0-7).
   23 (0x0080 0000): Fixed     | MemberOfGroup1. Keyring Pairing Lock Mask Group 1 (master keyrings 0x206-0x20D and slave keyrings 8-0xF).
   24 (0x0100 0000): Fixed     | MemberOfGroup2. Keyring Pairing Lock Mask Group 2 (master keyrings 0x340-0x343 and slave keyrings 0x10-0x1F).
   25 (0x0200 0000): Fixed     | MemberOfGroup3. Keyring Pairing Lock Mask Group 3 (master keyrings 0x344-0x353 and slave keyrings 0x20-0x2F).
   26 (0x0400 0000): Clearable | ?WriteByBigmacAllowed?. ?Locked keyring can target cmep memory.?
   27 (0x0800 0000): Clearable | WriteByCmepAllowed. Can be written directly by cmep.
   28 (0x1000 0000): Clearable | ReadByCmepAllowed. Can be read directly by cmep.

A normal keyring is a keyring that do not belong to any group (bit21-25 are all zeroes). It can be written by slaves of groups, and also by normal non-keyring operations. They can write to ?a normal keyring or to external memory?.

A master keyring can only write into a slave keyring belonging to the same group(s) as itself. A master keyring cannot write into a non-slave keyring or external memory.

A slave keyring can write to a normal keyring or to external memory, but not to a master keyring.

VULN!! If a keyring has AesDecryptAllowed flag, it is possible to encrypt arbitrary AES blocks without AesEncryptAllowed flag by using AES CTR mode.

SceBignum controller

0xE0040000

0x1000 config * 0x10 = 0x10000-bytes

Bigmac Crypto Controller

// base: 0xE0050000 (channel0), 0xE0050080 (channel1)
typedef struct BigmacOp {
	const void *src;
	union {
		void *dst;
		SceUInt32 dst_keyring_id;
	};
	SceSize len;
	int func; // operation

	SceUInt32 work_keyring_id;
	void *iv;
	void *next;
	int ready; // Writing 1 here starts the operation.

	int status;
	int res; // Set when invalid keyring (0xFFF). Bit18: Set when keyring is not allowed to perform operation.
} BigmacOp;

When Keyring is set to src, only slots with the 0x1000 flag can be targeted. Selecting a slot that does not have 0x1000 will only read zeros.

0xE005000C: Bigmac crypto controller function

There is usage of higher bits in the commands that do not seem to have much affect. For the encryption examples, 0xC002000 is also set on the command upper bits.

 Bits    Mask Value   Description
   0~1 | 0x00000003 | Function index
     2 | 0x00000004 | RNG
   3~5 | 0x00000038 | Algorithm index
     6 | 0x00000040 | DES (Probably)
     7 | 0x00000080 | Using external key (A key placed at 0xE0050200 is used instead of the key in the keyring)
   8~9 | 0x00000300 | Key size. 0x000: 64-bits, 0x100: 128-bits, 0x200: 192-bits, 0x300: 256-bits
 10~11 | 0x00000C00 | Hash transform flags. 0x400: hashUpdate, 0x800: hashFinalize, 0xC00: probably a fusion of hashUpdate and hashFinalize?
    12 | 0x00001000 | Unknown. Used by sceDmacMemcpy/sceDmacMemset.
    13 | 0x00002000 | Unknown. Some common option.
 14~23 | 0x00FFC000 | Unknown
 24~25 | 0x03000000 | Some address callback. Used by sceDmacMemcpy/sceDmacMemset. If set, need to call sceKernelSysrootDisableAutoClockDownForDriver. Setting this bit with AES function triggers hang.
 26~27 | 0x0C000000 | Unknown
    28 | 0x10000000 | Is destination a keyring
 29~31 | 0xE0000000 | Unknown

Functions list

function + RNG = bzero?

   Index   Real Value   Description
       0 | 0x00000000 | Memcpy (Also Bigmac too?)
       1 | 0x00000001 | AesEncrypt
       2 | 0x00000002 | AesDecrypt
       3 | 0x00000003 | Secure Hash Algorithm

Algorithms list

Index   Func   Real Value   Description
    0 |    1 | 0x00000001 | AesEcbEncrypt
    1 |    1 | 0x00000009 | AesCbcEncrypt
    2 |    1 | 0x00000011 | AesCtrEncrypt (encrypt context)
    3 |    1 | 0x00000019 | AesCbcEncrypt
    4 |    1 | 0x00000021 | AesCtrEncrypt (encrypt context)
    5 |    1 | 0x00000029 | AesEcbEncrypt
    6 |    1 | 0x00000031 | AesEcbEncrypt
    7 |    1 | 0x00000039 | Hang on Bigmac

    0 |    2 | 0x00000002 | AesEcbDecrypt
    1 |    2 | 0x0000000A | AesCbcDecrypt
    2 |    2 | 0x00000012 | AesCtrDecrypt (decrypt context)
    3 |    2 | 0x0000001A | AesCbcDecrypt
    4 |    2 | 0x00000022 | AesCtrDecrypt (decrypt context)
    5 |    2 | 0x0000002A | AesEcbDecrypt
    6 |    2 | 0x00000032 | AesEcbDecrypt
    7 |    2 | 0x0000003A | Hang on Bigmac

    0 |    3 | 0x00000003 | SHA1
    1 |    3 | 0x0000000B | SHA224
    2 |    3 | 0x00000013 | SHA256
    3 |    3 | 0x0000001B | !!! HANG !!!
    4 |    3 | 0x00000023 | HmacSha1
    5 |    3 | 0x0000002B | HmacSha224
    6 |    3 | 0x00000033 | HmacSha256
    7 |    3 | 0x0000003B | AesCmac/AES-CBC-MAC-64 (CMAC, OMAC1)

    0 |  RNG | 0x00000004 | RNG
    1 |  RNG | 0x0000000C | Memset (ch is written to MacDevice +0x104. On FW 3.60, the ch is seen at offset +0x34.)
    2 |  RNG | 0x00000014 | Memset
    3 |  RNG | 0x0000001C | Memset
    4 |  RNG | 0x00000024 | Memset
    5 |  RNG | 0x0000002C | Memset
    6 |  RNG | 0x00000034 | Memset
    7 |  RNG | 0x0000003C | Memset

DES algorithms

Unlike for Dmac5, DES is not supported for keyring Controller.

DES is DMAC only. If running on Bigmac, it triggered hang up. (is this true?)

If keysize is 128 or 192, DES is in fact 3DES.

If both DES and SHA bits are set, DES bit is ignored and SHA command is executed.

 Algo   Func   Real Value   Description
    0 |    0 | 0x00000040 | Unknown
    0 |    1 | 0x00000041 | DesEcbEncrypt
    0 |    2 | 0x00000042 | DesEcbDecrypt
    1 |    1 | 0x00000049 | DesCbcEncrypt
    1 |    2 | 0x0000004A | DesCbcDecrypt
    4 |    1 | 0x00000061 | Unknown. Hang up on bigmac. (DES + AesCtrEncrypt)

Key size algorithms

 Algo   Func   Keysize   Real Value   Description
    0 |    1 |     128 | 0x00000101 | Aes128EcbEncrypt
    0 |    2 |     128 | 0x00000102 | Aes128EcbDecrypt
    0 |    1 |     192 | 0x00000201 | Aes192EcbEncrypt
    0 |    2 |     192 | 0x00000202 | Aes192EcbDecrypt
    0 |    1 |     256 | 0x00000301 | Aes256EcbEncrypt
    0 |    2 |     256 | 0x00000302 | Aes256EcbDecrypt
    1 |    1 |     128 | 0x00000109 | Aes128CbcEncrypt
    1 |    2 |     128 | 0x0000010A | Aes128CbcDecrypt
    1 |    1 |     192 | 0x00000209 | Aes192CbcEncrypt
    1 |    2 |     192 | 0x0000020A | Aes192CbcDecrypt
    1 |    1 |     256 | 0x00000309 | Aes256CbcEncrypt
    1 |    2 |     256 | 0x0000030A | Aes256CbcDecrypt
    7 |    3 |     128 | 0x0000013B | Aes128Cmac/AES-CBC-MAC-128 (CMAC, OMAC1)
    7 |    3 |     192 | 0x0000023B | Aes192Cmac/AES-CBC-MAC-192 (CMAC, OMAC1)
    7 |    3 |     256 | 0x0000033B | Aes256Cmac/AES-CBC-MAC-256 (CMAC, OMAC1)

The following commands are known to be able to write keyrings:

 * AesEcbEncrypt/Decrypt:
     Size is rounded up to multiple of 4.
     If size > 16, size = 16.
     
     Read |size| bytes from |src| into HW state.
     The remaining 16-|size| bytes of state *ARE KEPT FROM RESULT OF PREVIOUS AES OPERATION*.
     VULN! This allows key recovery of all slave keyrings during boot.
     
     The key written to keyring is always 16 bytes long, padded with 00's.
     
 * AesCbcEncrypt/Decrypt: Size is rounded up to multiple of 4. 
 * AesCtrEncrypt/Decrypt: Size is rounded up to multiple of 4.
 * AesCmac                Puts the 16 byte hash into keyring.
                          Bytes 16-31 are *FORCED* 0.
 * Sha1:                  Puts the 20 byte hash into keyring.
                          Bytes 20-31 are *FORCED* 0.
 * Sha224:                Puts the 28 byte hash into keyring.
                          Bytes 28-31 are *FORCED* 0.
 * Sha256:                Puts the 32 byte hash into keyring.
 * HmacSha1               Probably same as Sha1.
 * HmacSha256             Probably same as Sha256.
 * Rng

AesCtrEncrypt when having a keyring dst, still reads from src.

VULN! Any SHA with length==0 produces an output of all zeroes!

0xE0050024: Status

 Bit  Mask Value   Description
  0 | 0x00000001 | Busy
 15 | 0x00008000 | Some error status
 16 | 0x00010000 | Some error status
 17 | 0x00020000 | Some error status
 18 | 0x00040000 | Not allowed operation

0xE005003C: Bigmac Rng

Reads a random value.

0xE0050100: Bigmac unknown 0x100 data

0xE0050200: Bigmac External Key

Size: 0x20 bytes

VULN! Allows partial overwrite. However when using keyring crypto, this key remains unaffected thus it cannot be used to recover keyring keys.

Bigmac Key Ring Base

See F00D Key Ring Base.

All keyrings flags are reset when CMeP is reset.

 Keyrings lock list
   Location        Keyring       Clear    When
    first_loader |         0xA | 0x1C1F | decrypt_enc_body
                          0x20 | 0x1C1F | update_slsk_metadata_keys
                         0x207 | 0x1C1F | remove_slsk_personalization
                   0x208~0x20D | 0x1C1F | update_slsk_metadata_keys
                         0x20F | 0x1C0F | Setting eMMC key
                         0x501 | 0x0800 | update_bigmac_key_0x501
                   0x700~0x7FF | 0x1000 | slsk_header_rsa_check
                   Any keyring | 0x1C1F | disable_bigmac_keys_by_header
   second_loader |       0x20E | 0x1FEF | Setting eMMC key
   secure_kernel |         0x8 | 0x1FFE | on tzs comm
                     0x2~  0x7 | 0x1FFF | on tzs comm
                     0x9~  0xF | 0x1FFF | on tzs comm
                    0x11~ 0x21 | 0x1FFF | on tzs comm
                    0x25~ 0x2F | 0x1FFF | on tzs comm
                    0x35~ 0x7F | 0x1FFF | on tzs comm
                   0x101~0x17F | 0x1FFF | on tzs comm
                   0x200~0x203 | 0x1FFF | on tzs comm
                   0x206~0x20D | 0x1FFF | on tzs comm
                   0x20E~0x20F | 0x1FEF | on tzs comm
                   0x210~0x211 | 0x1FFF | on tzs comm
                   0x214~0x215 | 0x1FFF | on tzs comm
                         0x217 | 0x1FFF | on tzs comm
                   0x300~0x33F | 0x1FFF | on tzs comm
                   0x341~0x344 | 0x1FFF | on tzs comm
                   0x349~0x3FF | 0x1FFF | on tzs comm
                   0x400~0x47F | 0x1FFF | on tzs comm
                         0x50E | 0x0800 | on tzs comm
                   0x51C~0x57F | 0x1FFF | on tzs comm
                   0x605~0x607 | 0x1FFF | on tzs comm
                   0x700~0x7FF | 0x1FFF | on tzs comm

0xE0058000: Bigmac KeyRings

Size: 0x10000 bytes.

0xE0070000: SceEmmcController

Address Length Description
0xE0070000 4 Ex: 1. Set to 0, then 1 after writing to 0xE0070008.
0xE0070008 4 Set to 0x020E020F in second_loader. ?eMMC related?
0xE007000C 4 Ex: 2.
0xE0070014 4 Set to 6 under some condition in second_loader.

0xE0070000: EmmcCrypto Toggle/Status?

Toggle: Set to 1.

Status: enabled emmc enc/dec?

0xE0070004: EmmcCrypto avalaible status

bit0(& 1): Not available -> second_loader throws error.

0xE0070008: EmmcCrypto keyset

Read value example: 0x20E and 0x20F (FW 1.69-3.73).

write only.

0xE007000C: Unknown

Read value example: 2

0xE00C0000

0xE00CC000: Unknown

Unknown. Read value example: 0x10006331

0xE00CC014: Unknown

Unknown. Read value example: 0x300000

0xE00CC070: Unknown

Unknown. Read value example: 1

0xE00CC078: Unknown

Unknown. Read value example: 0x300