Difference between revisions of "Cmep registers"

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 +
= 0xE0000000: Mailbox =
  
−
= F00D/ARM =
+
The mailbox is used for communication between ARM [[TrustZone]] and [[Cmep]] ([[Second Loader]] and [[Secure Kernel]]), and with the debugger. Communication seems to go through some sort of FIFO register.
  
−
== E0000000: MailboxFoodToArm ==
+
== Messages ==
−
Response to ARM is written here.
 
  
−
== E0000010: MailboxArmToFood ==
+
Messages are sent by Cmep to ARM [[TrustZone]] using the lower 16-bits at 0xE0000000. When ARM [[TrustZone]] has read it, the register is set to 0.
−
Request from ARM is written here.
 
  
−
== E0000020: MailboxFoodToDebugger ==
+
ARM [[TrustZone]] can write a 32-bit response to 0xE0000010. For ARM to Cmep, bit0 is used to indicate that the message has been written by ARM [[TrustZone]].
−
Size: 2x u32.
 
  
−
== E0000028: MailboxDebuggerToFood ==
+
<pre>
−
Size: 2x u32.
+
    1 = Request succeeded
 +
    4 = Debug string
 +
0x101 = Main init started
 +
0x102 = Sm can be loaded/resumed
 +
0x103 = Sm resumed successfully
 +
0x104 = Sm was shut down
 +
0x106 = Main shutting down
 +
0x107 = Suspend beginning
 +
0x108 = Ready for suspending, when using the async version.
 +
0x8016 = Error: Invalid address range
 +
0x802F = Error: Failed to init E003, E006.
 +
</pre>
  
−
== E0000060: MailboxDebuggerToFood2 ==
+
== 0xE0000000: MailboxCmepToArm ==
−
Size: 2x u32.
 
  
−
= F00D controller =
+
Response to ARM is written here. To read, get a double word from physical address <code>0xE0000000</code>. If it returns 0, no data is available. Otherwise, acknowledge that the data has been read by ARM [[TrustZone]] by putting the same data into <code>0xE0000000</code>.
  
−
== E0010000: FootReset ==
+
{| class="wikitable"
−
    Bit0: Hangs. ARM uses this to reset the F00D subsystem.
+
|-
 +
! Address !! RW permissions !! Use !! Description
 +
|-
 +
| 0xE0000000 || RW || Status || Read for status.
 +
|-
 +
| 0xE0000004 || RW || Result || Cmep to ARM. 1: success. 3: command not found. 5: Invalid arguments. Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.
 +
|-
 +
| 0xE0000008 || RW || ? || Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.
 +
|-
 +
| 0xE000000C || RW || ? || Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.
 +
|}
  
−
== E0010004: FoodStatus ==
+
== 0xE0000010: MailboxArmToCmep ==
−
     Bit31:  IsFoodAlive
+
 
 +
Request from ARM is written here. To write, put the double word into physical address <code>0xE0000010</code>. Next read <code>0xE0000010</code> until it returns 0, which indicates the data was read by Cmep.
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Address !! RW permissions !! Use !! Description
 +
|-
 +
| 0xE0000010 || RW || Command || ARM to Cmep. Send a command to Cmep.
 +
|-
 +
| 0xE0000014 || RW || Arguments || ARM to Cmep. (PA & 1) == 1: valid arguments. See [[#Executing Secure Module functions|Executing Secure Module functions]].
 +
|-
 +
| 0xE0000018 || RW || ? || See [[#Executing Secure Module functions|Executing Secure Module functions]].
 +
|-
 +
| 0xE000001C || RW || ? || See [[#Executing Secure Module functions|Executing Secure Module functions]].
 +
|}
 +
 
 +
== 0xE0000020: MailboxCmepToDebugger ==
 +
 
 +
Size: 2 * DWORD.
 +
 
 +
== 0xE0000028: MailboxDebuggerToCmep ==
 +
 
 +
Size: 2 * DWORD.
 +
 
 +
== 0xE0000054: unknown ==
 +
 
 +
{| class="wikitable"
 +
|-
 +
! Address !! RW permissions !! Use !! Description
 +
|-
 +
| 0xE0000054 || RW || ? || Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.
 +
|-
 +
| 0xE0000058 || RW || ? || Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.
 +
|-
 +
| 0xE000005C || RW || ? || Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.
 +
|}
 +
 
 +
== 0xE0000060: MailboxDebuggerToCmep2 ==
 +
 
 +
Size: 2 * DWORD.
 +
 
 +
= 0xE0010000: Cmep controller =
 +
 
 +
{| class="wikitable"
 +
|-
 +
! 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 ==
 +
 
 +
    0xE0010000: 00 00 00 00 05 00 00 80 00 00 00 00 00 00 00 00
 +
 
 +
    Bit0: Hangs. ARM uses this to reset the Cmep subsystem. Used by Cmep command 0 to prepare Cmep to receive an address that contains the secure_kernel.enp. RW.
 +
 
 +
== 0xE0010004: CmepStatus ==
 +
 
 +
     Bit31:  IsCmepAlive
 
     Bit0-2: ?
 
     Bit0-2: ?
  
−
    0xE0010000: 00 00 00 00 05 00 00 80 00 00 00 00 00 00 00 00
+
Used by Cmep command 0 to check if the value written in <code>0xE0010000</code> is okay (it should return a value <= 0). Read allowed, maybe not write.
−
    0xE0010010: 01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
 
  
−
== E0010010 ==
+
== 0xE0010010: Device disable ==
−
Reads back 0x7FF. Then hangs after delay.
 
  
−
    Bit5: Disables Key* registers, and KeyRingDirectAccess
+
Each bit corresponds to a different secure device
 +
This functionality is only present on SoC v3.2+
  
−
No bit appears to disable Rsa* registers, or Bigmac*.
+
= 0xE0020000: Cmep 0xE0020000 =
  
−
    0xE0020000: 0F 00 02 00 00 00 00 00 00 00 00 00 00 00 00 00
+
{| class="wikitable"
−
    0xE0020010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
+
|-
 +
! 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 || Used in bignum powmod worker. Checked for 0 by second_loader. May be a kind of timer or working state.
 +
|-
 +
| 0xE0020040 || 0x10 || [[ReadAs|Read As]]
 +
|-
 +
| 0xE0020100 || 0x20 || Per-console 256-bit key from keyring 0x602 is copied here by second_loader.
 +
|}
  
−
= F00D_E0020000 =
+
== 0xE0020000 flags ==
  
−
== E0020000 ==
 
 
     Bit0: Reboot when cleared.
 
     Bit0: Reboot when cleared.
−
     Bit1: Hang when cleared. Unrecoverable
+
     Bit1: Makes first_loader load secure_kernel. Hang when cleared and unrecoverable.
 
     Bit2: No hang when cleared.
 
     Bit2: No hang when cleared.
 
     Bit3: No hang when cleared.
 
     Bit3: No hang when cleared.
−
     Bit4:
+
     Bit4: ?
−
     Bit5:
+
     Bit5: ?
−
     Bit16: No hang when cleared.
+
     Bit16: Allows ARM to reset Cmep. No hang when cleared.
−
     Bit17:
+
     Bit17: ?
 +
 
 +
= 0xE0030000: Bigmac Keyring controller =
 +
 
 +
This device is mapped to ScePervasiveResetReg at offset 0x190 for controlling reset and enabling mask writing.
 +
 
 +
<source lang="C">
 +
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;
 +
</source>
 +
 
 +
== 0xE0030000: KeyringNewValue ==
 +
 
 +
Size: 8 * DWORD.
 +
 
 +
== 0xE0030020: KeyringSetValueTrigger ==
 +
 
 +
Write value to a keyring. Requires the keyring to be enabled and WriteByCmepAllowed flag to be set.
  
−
== E0020004: ? ==
+
Write a keyring to this address, and the Bigmac Keyring Controller will write value from physical address 0xE0030000 to the keyring.
−
second_loader writes 0x30003 followed by 0 here, after clearing keys.
 
  
−
== E0020020: ? ==
+
== 0xE0030024: KeyringClearFlags ==
−
rsa_expmod() reads and writes back this register before reading the result of the RSA operation.
 
  
−
= Keyring controller =
+
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.
  
−
== 0xE0030000-0xE003001F: KeySetValue ==
+
Writing <code>((flags_mask<<16)|keyring_id)</code> to <code>keyring_clear_flags</code> clear flags for this keyring.
−
Size: 8x u32.
 
  
−
== E0030020: KeySetValueTrigger ==
+
    Bit0-15: KeyringId
−
Write keyslot here, and it will write value written above to it.
+
    Bit16-31: KeyringClearFlagsMask
  
−
== E0030024: KeySetProtect ==
+
== 0xE0030028: KeyringQueryFlags ==
−
    Bit0-15:  KeyslotNumber
 
−
    Bit16-31: KeyslotClearFlags
 
  
−
== E0030028: KeyQueryProtect ==
+
Writing <code>keyring_id</code> to <code>keyring_query_flags_request</code> returns current flags in <code>keyring_query_flags_response</code>.
−
    Bit0-15: KeyslotNumber
 
  
−
== E003002C: KeyQueryProtectResult ==
+
     Bit0-15: KeyringId
−
     Bit0: SlotExists
 
−
    Bit1: HasBeenWrittenOnce. You cannot use a key if this is not set.
 
−
    Bit2: HasBeenWrittenMoreThanOnce
 
−
    Bit16:  Clearable  | AesEncryptAllowed (CTR+CBC+ECB, any key size)
 
−
    Bit17:  Clearable  | AesDecryptAllowed (CTR+CBC+ECB, any key size)
 
−
    Bit18:  Clearable  | ShaHmacAllowed (SHA1+SHA256)
 
−
    Bit19:  Clearable  | AesCmacAllowed
 
−
    Bit20:  Clearable  | EmmcCryptoAllowed (qualified guess!)
 
−
    Bit21:  Fixed      | IsMaster
 
−
    Bit22:  Fixed      | MemberOfGroup0
 
−
    Bit23:  Fixed      | MemberOfGroup1
 
−
    Bit24:  Fixed      | MemberOfGroup2
 
−
    Bit25:  Fixed      | MemberOfGroup3
 
−
    Bit26:  Clearable  | SetByBigmacAllowed
 
−
    Bit27:  Clearable  | SetByKeyringAllowed
 
−
    Bit28:  Clearable  | GetByKeyringAllowed
 
  
−
A master key can only write into a slave keyslot belonging to the same group(s) as itself.
+
== 0xE003002C: KeyringQueryFlagsResponse ==
  
−
A master key cannot write into a non-slave keyslot or external memory.
+
    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.
  
−
Normal keyslots are keyslots that don't belong to any group (bit21-25 are all zeroes). They can be written by slaves of groups, and also by normal non-keyslot operations.
+
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 slave can write output to a normal keyslot 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 =
 
= SceBignum controller =
  
−
== E0040108 RsaSignatureBuffer ==
+
== 0xE0040000 ==
−
Size: 0x100 bytes.
 
  
−
== E0040400 RsaModulusBuffer ==
+
0x1000 config * 0x10 = 0x10000-bytes
−
Size: 0x100 bytes.
 
  
−
== E0040800 RsaControl ==
+
status bits
−
In u32's.
 
  
−
== E0040800 RsaStatus ==
+
<source>
−
    Bit31: Busy
+
0x2000000 : error
 +
0x4000000 : busy for vEX (exponent)
 +
0x8000000 : still need vEX (exponent)
 +
0x80000000 : busy
 +
</source>
  
−
== E0040808 RsaExponent ==
+
= Bigmac Crypto Controller =
−
 
 
−
= SceBigmac controller =
 
  
 
<source lang="C">
 
<source lang="C">
−
// base:0xE0050000(channel0), 0xE0050080(channel1)
+
// base: 0xE0050000 (channel0), 0xE0050080 (channel1)
−
typedef struct SceBigmacOp {
+
typedef struct BigmacOp {
 
const void *src;
 
const void *src;
 
union {
 
union {
 
void *dst;
 
void *dst;
−
int slot_id;
+
SceUInt32 dst_keyring_id;
 
};
 
};
 
SceSize len;
 
SceSize len;
−
int func; // BigmacOp
+
int func; // operation
  
−
int key_slot;
+
SceUInt32 work_keyring_id;
 
void *iv;
 
void *iv;
 
void *next;
 
void *next;
−
int ready; // Writing 1 here starts bigmac operation.
+
int ready; // Writing 1 here starts the operation.
  
 
int status;
 
int status;
−
int res; // Set when invalid keyslot (0xFFF). Bit18: Set when keyslot is not allowed to perform operation.
+
int res; // Set when invalid keyring (0xFFF). Bit18: Set when keyring is not allowed to perform operation.
−
} SceBigmacOp;
+
} BigmacOp;
 
</source>
 
</source>
  
−
== E005000C 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.
−
Unlike Dmac5, DES is not supported for Bigmac.
 
  
−
  Bit0-6: Algorithm
+
== 0xE005000C: Bigmac crypto controller function ==
−
  0x00 = Zeroes?
 
−
  0x01 = AesEcbEncrypt
 
−
  0x02 = AesEcbDecrypt
 
−
  0x03 = Sha1
 
−
  0x04 = Rng
 
−
  0x05 = Zeroes
 
−
  0x06 = Zeroes
 
−
  0x07 = Zeroes
 
−
  0x09 = AesCbcEncrypt
 
−
  0x0A = AesCbcDecrypt
 
−
  0x0B = Sha224
 
−
  0x0C = Zeroes
 
−
  0x0D = Zeroes
 
−
  0x0E = Zeroes
 
−
  0x0F = Zeroes
 
−
  0x10 = AesCtr
 
−
  0x11 = AesCtrEncrypt
 
−
  0x12 = AesCtrDecrypt
 
−
  0x13 = Sha256
 
−
  0x1B = !!! HANG !!!
 
−
  0x23 = HmacSha1, keylength=32 bytes
 
−
  0x2B = !!! HANG !!!
 
−
  0x33 = HmacSha256, keylength=32 bytes
 
−
  0x3B = AesCmac
 
−
  0x41  = !!! HANG !!!
 
−
  0x43 = <0x03>
 
−
  0x4B = <0x0b>
 
−
  0x53 = <0x13>
 
−
  0x61  = !!! HANG !!!
 
−
  0x7B = <0x3b>
 
−
  0x141 = !!! HANG !!!
 
  
−
    Bit7:    UseExternalKey
+
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.
−
    Bit8-10: KeySize (0=64bit, 1=128bit, 2=192bit, 3=256bit)
 
−
            (Applies only to AesEcb, AesCbc, AesCmac)
 
−
    Bit11:  Nothing noticable for AesEcbEncrypt
 
−
    Bit12:  Nothing noticable for AesEcbEncrypt
 
−
    Bit24:  Causes hang
 
−
    Bit25:  Causes hang
 
−
    Bit28:  IsDstKeyslot
 
  
−
The following are known to be able to write keyslots:
+
Also some bits seem to affect the ARM cache.
 +
 
 +
  Bits    Mask Value  Description
 +
    0~2 | 0x00000007 | Algorithm
 +
    3~5 | 0x00000038 | Mode
 +
      6 | 0x00000040 | DES
 +
      7 | 0x00000080 | Use external key (a key placed at 0xE0050200 is used instead of the key in the keyring)
 +
    8~9 | 0x00000300 | Key size for AES and DES functions. 0x000: 64-bits, 0x100: 128-bits, 0x200: 192-bits, 0x300: 256-bits
 +
  10~11 | 0x00000C00 | Hash transform flags. 0x400: hashUpdate, 0x800: 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 an AES function triggers hang.
 +
  26~27 | 0x0C000000 | Unknown
 +
    28 | 0x10000000 | Is destination a keyring
 +
  29~31 | 0xE0000000 | Unknown
 +
 
 +
Functions list:
 +
* 0x00000000 Copy
 +
* 0x00000001 Encrypt. Default algorithm is AES. Default mode is ECB.
 +
* 0x00000002 Decrypt. Default algorithm is AES. Default mode is ECB.
 +
* 0x00000003 Hash. Default algorithm is SHA-1.
 +
* 0x00000004 RNG
 +
* 0x00000008 CBC mode
 +
* 0x0000000B Sha224
 +
* 0x0000000C Memset
 +
* 0x00000010 CTR mode
 +
* 0x00000013 Sha256
 +
* 0x00000020 HMAC-Sha
 +
* 0x0000003B CBC-MAC (The size written to dst is always 16-bytes)
 +
* 0x00000040 DES
 +
 
 +
Functions examples:
 +
* 0x00000001 AesEcbEncrypt
 +
* 0x00000009 AesCbcEncrypt
 +
* 0x00000011 AesCtrEncrypt
 +
* 0x00000002 AesEcbDecrypt
 +
* 0x0000000A AesCbcDecrypt
 +
* 0x00000012 AesCtrDecrypt
 +
* 0x00000041 DesEcbEncrypt
 +
* 0x00000042 DesEcbDecrypt
 +
* 0x00000049 DesCbcEncrypt
 +
* 0x0000004A DesCbcDecrypt
 +
* 0x00000003 SHA1
 +
* 0x0000000B SHA224
 +
* 0x00000013 SHA256
 +
* 0x00000023 HmacSha1
 +
* 0x0000002B HmacSha224
 +
* 0x00000033 HmacSha256
 +
* 0x0000003B AesCmac/AES-CBC-MAC-64 (CMAC, OMAC1)
 +
* 0x00000004 RNG
 +
* 0x0000000C Memset (ch is written to MacDevice offset 0x104. On FW 3.600.011, the ch is at offset 0x34)
 +
 
 +
Unlike for [[DMAC#DMAC5|Dmac5]], DES is not supported by Bigmac and it triggers hang up (to confirm). Note that 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.
 +
 
 +
Key sizes examples:
 +
* 0x00000101 Aes128EcbEncrypt
 +
* 0x00000102 Aes128EcbDecrypt
 +
* 0x00000201 Aes192EcbEncrypt
 +
* 0x00000202 Aes192EcbDecrypt
 +
* 0x00000301 Aes256EcbEncrypt
 +
* 0x00000302 Aes256EcbDecrypt
 +
* 0x00000109 Aes128CbcEncrypt
 +
* 0x0000010A Aes128CbcDecrypt
 +
* 0x00000209 Aes192CbcEncrypt
 +
* 0x0000020A Aes192CbcDecrypt
 +
* 0x00000309 Aes256CbcEncrypt
 +
* 0x0000030A Aes256CbcDecrypt
 +
* 0x0000013B Aes128Cmac/AES-CBC-MAC-128 (CMAC, OMAC1)
 +
* 0x0000023B Aes192Cmac/AES-CBC-MAC-192 (CMAC, OMAC1)
 +
* 0x0000033B Aes256Cmac/AES-CBC-MAC-256 (CMAC, OMAC1)
 +
 
 +
The following commands are known to be able to write to keyrings:
 
   * AesEcbEncrypt/Decrypt:
 
   * AesEcbEncrypt/Decrypt:
 
       Size is rounded up to multiple of 4.
 
       Size is rounded up to multiple of 4.
 
       If size > 16, size = 16.
 
       If size > 16, size = 16.
−
 
+
     
 
       Read |size| bytes from |src| into HW state.
 
       Read |size| bytes from |src| into HW state.
 
       The remaining 16-|size| bytes of state *ARE KEPT FROM RESULT OF PREVIOUS AES OPERATION*.
 
       The remaining 16-|size| bytes of state *ARE KEPT FROM RESULT OF PREVIOUS AES OPERATION*.
−
       VULN! This allows key recovery of all slave keyslots during boot.
+
       VULN! This allows key recovery of all slave keyrings during boot.
−
 
+
     
−
       The key written to keyslot is always 16 bytes long, padded with 00's.
+
       The key written to keyring is always 16 bytes long, padded with 00's.
−
 
+
     
 
   * AesCbcEncrypt/Decrypt: Size is rounded up to multiple of 4.  
 
   * AesCbcEncrypt/Decrypt: Size is rounded up to multiple of 4.  
 
   * AesCtrEncrypt/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 keyslot.
+
   * AesCmac                Puts the 16 byte hash into keyring.
 
                           Bytes 16-31 are *FORCED* 0.
 
                           Bytes 16-31 are *FORCED* 0.
−
   * Sha1:                  Puts the 20 byte hash into keyslot.
+
   * Sha1:                  Puts the 20 byte hash into keyring.
 
                           Bytes 20-31 are *FORCED* 0.
 
                           Bytes 20-31 are *FORCED* 0.
−
   * Sha224:                Puts the 28 byte hash into keyslot.
+
   * Sha224:                Puts the 28 byte hash into keyring.
 
                           Bytes 28-31 are *FORCED* 0.
 
                           Bytes 28-31 are *FORCED* 0.
−
   * Sha256:                Puts the 32 byte hash into keyslot.
+
   * Sha256:                Puts the 32 byte hash into keyring.
 
   * HmacSha1              Probably same as Sha1.
 
   * HmacSha1              Probably same as Sha1.
 
   * HmacSha256            Probably same as Sha256.
 
   * HmacSha256            Probably same as Sha256.
 
   * Rng
 
   * Rng
  
−
AesCtrEncrypt when having a keyslot dst, still reads from src.
+
AesCtrEncrypt when having a keyring dst, still reads from src.
  
 
VULN! Any SHA with length==0 produces an output of all zeroes!
 
VULN! Any SHA with length==0 produces an output of all zeroes!
  
−
== E005003C BigmacRng ==
+
== 0xE0050024: Stat ==
 +
 
 +
  Bit  Mask Value  Description
 +
  0 | 0x00000001 | Busy
 +
  1 | 0x00000002 | DMAC transfer is aborted
 +
  15 | 0x00008000 | Some error status
 +
  16 | 0x00010000 | DMAC transfer error: read error
 +
  17 | 0x00020000 | DMAC transfer error: write error
 +
  18 | 0x00040000 | DMAC error: illegal configuration
 +
  19 | 0x00080000 | DMAC transfer error: tag error
 +
  20 | 0x00100000 | DMAC transfer error: zero byte error
 +
 
 +
== 0xE005003C: Bigmac Rng ==
 +
 
 
Reads a random value.
 
Reads a random value.
  
−
== E0050200 BigmacExternalKey ==
+
== 0xE0050104: Busy bigmac channels ==
−
Size: 0x20 bytes
+
RW Bitfield: bit0 - channel0 busy, bit1 - channel1 busy
 +
 
 +
== 0xE0050108: Disabled bigmac channels ==
 +
RO Bitfield: bit0 - channel0 disabled, bit1 - channel1 disabled
 +
 
 +
== 0xE005011C: Bigmac exception status ==
 +
* 0xE0050118: optional exception data such as illegal addr, RO
 +
* 0xE005011C: exception bitfield (eg bit8 illegal read, bit9 illegal write, higher bits are OPids - interface, cmd, internal etc)
 +
Once an exception occurs and the bitfield is set, you must ack by clearing it otherwise no further exceptions will be logged.
  
−
VULN! Allows partial overwrite. However when using keyslot crypto, this key remains unaffected. Thus it cannot be used to recover keyslot keys.
+
== 0xE0050200: Bigmac External Key ==
  
−
= SceBigmac Keyring =
+
Size: 0x20 bytes
  
−
== E0058000 KeyRingDirectAccess ==
+
VULN! Allows partial overwrite. However when using keyring crypto, this key remains unaffected thus it cannot be used to recover keyring keys.
−
Size: 0x10000 bytes.
 
  
−
Key slots
+
= Bigmac Key Ring Base =
  
−
0x000-0x07F:
+
See [[Cmep Key Ring Base]].
−
    Initial state: Empty keyslots.
 
−
    0x000-0x007: Empty group0 slave keyslots, for AES decryption only.
 
−
    0x008-0x00F: Empty group1 slave keyslots, any algo.
 
−
    0x010-0x01F: Empty group2 slave keyslots, for AES decryption only.
 
−
    0x020-0x02F: Empty group3 slave keyslots, any algo.
 
−
    0x030-0x07F: Empty normal keyslots, any algo.
 
  
−
0x100-0x17F:
+
All keyrings flags are reset when Cmep is reset.
−
    Initial state: Empty keyslots.
 
−
    0x100-0x17F: Empty normal keyslots, any algo.
 
  
−
0x200-0x217:
+
  Keyrings lock list
−
     Initial state: Filled in, key material.
+
    Location        Keyring      Clear    When
−
     0x200-0x203: AES decryption-only keys (for memory buffers).
+
    first_loader |        0xA | 0x1C1F | decrypt_enc_body
−
    0x204-0x205: Master keys (for group0), any algo.
+
                          0x20 | 0x1C1F | update_slsk_metadata_keys
−
    0x206-0x20D: Master keys (for group1), any algo.
+
                          0x207 | 0x1C1F | remove_slsk_personalization
−
    0x20E-0x20F: Emmc keys, fully protected.
+
                    0x208~0x20D | 0x1C1F | update_slsk_metadata_keys
−
    0x210-0x217: General purpose keys (for memory buffers).
+
                          0x20F | 0x1C0F | set first 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 | set second eMMC key
 +
     secure_kernel |        0x8 | 0x1FFE | on TZS communication
 +
                      0x2~  0x7 | 0x1FFF | on TZS communication
 +
                      0x9~  0xF | 0x1FFF | on TZS communication
 +
                    0x11~ 0x21 | 0x1FFF | on TZS communication
 +
                    0x25~ 0x2F | 0x1FFF | on TZS communication
 +
                    0x35~ 0x7F | 0x1FFF | on TZS communication
 +
                    0x101~0x17F | 0x1FFF | on TZS communication
 +
                    0x200~0x203 | 0x1FFF | on TZS communication
 +
                    0x206~0x20D | 0x1FFF | on TZS communication
 +
                    0x20E~0x20F | 0x1FEF | on TZS communication
 +
                    0x210~0x211 | 0x1FFF | on TZS communication
 +
                    0x214~0x215 | 0x1FFF | on TZS communication
 +
                          0x217 | 0x1FFF | on TZS communication
 +
                    0x300~0x33F | 0x1FFF | on TZS communication
 +
                    0x341~0x344 | 0x1FFF | on TZS communication
 +
                    0x349~0x3FF | 0x1FFF | on TZS communication
 +
                    0x400~0x47F | 0x1FFF | on TZS communication
 +
                          0x50E | 0x0800 | on TZS communication
 +
                    0x51C~0x57F | 0x1FFF | on TZS communication
 +
                    0x605~0x607 | 0x1FFF | on TZS communication
 +
                    0x700~0x7FF | 0x1FFF | on TZS communication
  
−
0x300-0x3FF:
+
== 0xE0058000: Bigmac KeyRings ==
−
    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).
 
  
−
0x400-0x47F:
+
Size: 0x10000 bytes.
−
    Initial state: Empty data storage, read-write from keyring.
 
  
−
0x500-0x57F:
+
= 0xE0070000: SceEmmcController =
−
    Initial state: Empty data storage, read-write from keyring.
 
  
−
0x600-0x607:
+
{| class="wikitable"
−
    Initial state: Filled in data, read-only. Keyring only.
+
|-
−
    0x603: u32 BootromFlags.
+
! Address !! Length !! Description
−
      Bit0-15: HasRsaRevocationKey. This is set to 0xFFFF.
+
|-
−
      Bit16:  UseAlternativeEmmcClock
+
| 0xE0070000 || 4 || Ex: 1. Set to 0, then 1 after writing to 0xE0070008.
 +
|-
 +
| 0xE0070008 || 4 || Set to 0x020E020F in second_loader. Probably also set to 0x020E020F in first_loader.
 +
|-
 +
| 0xE007000C || 4 || Ex: 2.
 +
|-
 +
| 0xE0070014 || 4 || Set to 6 under some condition in second_loader.
 +
|}
  
−
0x700-0x77F:
+
== 0xE0070000: EmmcCrypto Toggle ==
−
    Initial state: Filled in data, read-only. Keyring only.
 
−
    0x700-0x708: RsaRevocationKey0
 
−
    0x708-0x710: RsaRevocationKey1
 
−
    0x710-0x718: RsaRevocationKey2
 
−
    0x718-0x720: RsaRevocationKey3
 
−
    0x720-0x728: RsaRevocationKey4
 
−
    0x728-0x730: RsaRevocationKey5
 
−
    ...
 
−
    0x778-0x780: RsaRevocationKey15
 
  
−
= SceEmmcController =
+
Toggle: Set to 1 to enable eMMC crypto, 0 to disable.
  
−
== 0xE0070000 EmmcCrypto Toggle/Status? ==
+
== 0xE0070004: EmmcCrypto availability status ==
  
−
Toggle : Set to 1.
+
bit0 (& 1): Not available -> [[Second Loader]] throws error.
  
−
Status : enabled emmc encdec?
+
== 0xE0070008: EmmcCrypto keyrings indexes ==
  
−
== 0xE0070004 EmmcCrypto avaliable status ==
+
There are two 16-bit keyrings indexes.
  
−
bit0(& 1) : Not avaliable. -> second_loader throw error.
+
Ex: 0x020E020F (set in 1.69-3.740.011 second_loader): keyrings 0x20E and 0x20F.
  
−
== 0xE0070008 EmmcCrypto keyset ==
+
Only writeable.
  
−
1.69-3.73 : 0x20E and 0x20F.
+
If set to an invalid keyring, eMMC crypto is disabled.
  
−
write only.
+
== 0xE007000C: Unknown ==
  
−
== 0xE007000C Unknown ==
+
Read value example: 2
  
−
Can to read the 2.
+
= 0xE00C0000 - Cmep XBar =
  
−
[[Category:Keyring]]
+
[[Category:Cmep]]
 +
[[Category:ARM]]
 +
[[Category:MMIO]]

Latest revision as of 02:14, 27 October 2023

0xE0000000: Mailbox

The mailbox is used for communication between ARM TrustZone and Cmep (Second Loader and Secure Kernel), and with the debugger. Communication seems to go through some sort of FIFO register.

Messages

Messages are sent by Cmep to ARM TrustZone using the lower 16-bits at 0xE0000000. When ARM TrustZone has read it, the register is set to 0.

ARM TrustZone can write a 32-bit response to 0xE0000010. For ARM to Cmep, bit0 is used to indicate that the message has been written by ARM TrustZone. 

     1 = Request succeeded
     4 = Debug string
 0x101 = Main init started
 0x102 = Sm can be loaded/resumed
 0x103 = Sm resumed successfully
 0x104 = Sm was shut down
 0x106 = Main shutting down
 0x107 = Suspend beginning
 0x108 = Ready for suspending, when using the async version.
0x8016 = Error: Invalid address range
0x802F = Error: Failed to init E003, E006.

0xE0000000: MailboxCmepToArm

Response to ARM is written here. To read, get a double word from physical address 0xE0000000. If it returns 0, no data is available. Otherwise, acknowledge that the data has been read by ARM TrustZone by putting the same data into 0xE0000000.

Address RW permissions Use Description
0xE0000000 RW Status Read for status.
0xE0000004 RW Result Cmep to ARM. 1: success. 3: command not found. 5: Invalid arguments. Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.
0xE0000008 RW ? Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.
0xE000000C RW ? Used by SMC 0x12d, 0x136, 0x137, 0x13B, interrupt 0xC8.

0xE0000010: MailboxArmToCmep

Request from ARM is written here. To write, put the double word into physical address 0xE0000010. Next read 0xE0000010 until it returns 0, which indicates the data was read by Cmep.

Address RW permissions Use Description
0xE0000010 RW Command ARM to Cmep. Send a command to Cmep.
0xE0000014 RW Arguments ARM to Cmep. (PA & 1) == 1: valid arguments. See Executing Secure Module functions.
0xE0000018 RW ? See Executing Secure Module functions.
0xE000001C RW ? See Executing Secure Module functions.

0xE0000020: MailboxCmepToDebugger

Size: 2 * DWORD.

0xE0000028: MailboxDebuggerToCmep

Size: 2 * DWORD.

0xE0000054: unknown

Address RW permissions Use Description
0xE0000054 RW ? Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.
0xE0000058 RW ? Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.
0xE000005C RW ? Used by SMC 0x12d, 0x135, 0x13B, interrupt 0xC8.

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

   0xE0010000: 00 00 00 00 05 00 00 80 00 00 00 00 00 00 00 00

   Bit0: Hangs. ARM uses this to reset the Cmep subsystem. Used by Cmep command 0 to prepare Cmep to receive an address that contains the secure_kernel.enp. RW.

0xE0010004: CmepStatus

   Bit31:  IsCmepAlive
   Bit0-2: ?

Used by Cmep command 0 to check if the value written in 0xE0010000 is okay (it should return a value <= 0). Read allowed, maybe not write.

0xE0010010: Device disable

Each bit corresponds to a different secure device This functionality is only present on SoC v3.2+

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 Used in bignum powmod worker. 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

status bits 

0x2000000 : error
 0x4000000 : busy for vEX (exponent)
 0x8000000 : still need vEX (exponent)
0x80000000 : busy

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.

Also some bits seem to affect the ARM cache. 

 Bits    Mask Value   Description
   0~2 | 0x00000007 | Algorithm
   3~5 | 0x00000038 | Mode
     6 | 0x00000040 | DES
     7 | 0x00000080 | Use external key (a key placed at 0xE0050200 is used instead of the key in the keyring)
   8~9 | 0x00000300 | Key size for AES and DES functions. 0x000: 64-bits, 0x100: 128-bits, 0x200: 192-bits, 0x300: 256-bits
 10~11 | 0x00000C00 | Hash transform flags. 0x400: hashUpdate, 0x800: 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 an AES function triggers hang.
 26~27 | 0x0C000000 | Unknown
    28 | 0x10000000 | Is destination a keyring
 29~31 | 0xE0000000 | Unknown

Functions list:

  • 0x00000000 Copy
  • 0x00000001 Encrypt. Default algorithm is AES. Default mode is ECB.
  • 0x00000002 Decrypt. Default algorithm is AES. Default mode is ECB.
  • 0x00000003 Hash. Default algorithm is SHA-1.
  • 0x00000004 RNG
  • 0x00000008 CBC mode
  • 0x0000000B Sha224
  • 0x0000000C Memset
  • 0x00000010 CTR mode
  • 0x00000013 Sha256
  • 0x00000020 HMAC-Sha
  • 0x0000003B CBC-MAC (The size written to dst is always 16-bytes)
  • 0x00000040 DES

Functions examples:

  • 0x00000001 AesEcbEncrypt
  • 0x00000009 AesCbcEncrypt
  • 0x00000011 AesCtrEncrypt
  • 0x00000002 AesEcbDecrypt
  • 0x0000000A AesCbcDecrypt
  • 0x00000012 AesCtrDecrypt
  • 0x00000041 DesEcbEncrypt
  • 0x00000042 DesEcbDecrypt
  • 0x00000049 DesCbcEncrypt
  • 0x0000004A DesCbcDecrypt
  • 0x00000003 SHA1
  • 0x0000000B SHA224
  • 0x00000013 SHA256
  • 0x00000023 HmacSha1
  • 0x0000002B HmacSha224
  • 0x00000033 HmacSha256
  • 0x0000003B AesCmac/AES-CBC-MAC-64 (CMAC, OMAC1)
  • 0x00000004 RNG
  • 0x0000000C Memset (ch is written to MacDevice offset 0x104. On FW 3.600.011, the ch is at offset 0x34)

Unlike for Dmac5, DES is not supported by Bigmac and it triggers hang up (to confirm). Note that 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.

Key sizes examples:

  • 0x00000101 Aes128EcbEncrypt
  • 0x00000102 Aes128EcbDecrypt
  • 0x00000201 Aes192EcbEncrypt
  • 0x00000202 Aes192EcbDecrypt
  • 0x00000301 Aes256EcbEncrypt
  • 0x00000302 Aes256EcbDecrypt
  • 0x00000109 Aes128CbcEncrypt
  • 0x0000010A Aes128CbcDecrypt
  • 0x00000209 Aes192CbcEncrypt
  • 0x0000020A Aes192CbcDecrypt
  • 0x00000309 Aes256CbcEncrypt
  • 0x0000030A Aes256CbcDecrypt
  • 0x0000013B Aes128Cmac/AES-CBC-MAC-128 (CMAC, OMAC1)
  • 0x0000023B Aes192Cmac/AES-CBC-MAC-192 (CMAC, OMAC1)
  • 0x0000033B Aes256Cmac/AES-CBC-MAC-256 (CMAC, OMAC1)

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

 Bit  Mask Value   Description
  0 | 0x00000001 | Busy
  1 | 0x00000002 | DMAC transfer is aborted
 15 | 0x00008000 | Some error status
 16 | 0x00010000 | DMAC transfer error: read error
 17 | 0x00020000 | DMAC transfer error: write error
 18 | 0x00040000 | DMAC error: illegal configuration
 19 | 0x00080000 | DMAC transfer error: tag error
 20 | 0x00100000 | DMAC transfer error: zero byte error

0xE005003C: Bigmac Rng

Reads a random value.

0xE0050104: Busy bigmac channels

RW Bitfield: bit0 - channel0 busy, bit1 - channel1 busy

0xE0050108: Disabled bigmac channels

RO Bitfield: bit0 - channel0 disabled, bit1 - channel1 disabled

0xE005011C: Bigmac exception status

* 0xE0050118: optional exception data such as illegal addr, RO
* 0xE005011C: exception bitfield (eg bit8 illegal read, bit9 illegal write, higher bits are OPids - interface, cmd, internal etc)

Once an exception occurs and the bitfield is set, you must ack by clearing it otherwise no further exceptions will be logged.

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 Cmep 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 | set first 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 | set second eMMC key
   secure_kernel |         0x8 | 0x1FFE | on TZS communication
                     0x2~  0x7 | 0x1FFF | on TZS communication
                     0x9~  0xF | 0x1FFF | on TZS communication
                    0x11~ 0x21 | 0x1FFF | on TZS communication
                    0x25~ 0x2F | 0x1FFF | on TZS communication
                    0x35~ 0x7F | 0x1FFF | on TZS communication
                   0x101~0x17F | 0x1FFF | on TZS communication
                   0x200~0x203 | 0x1FFF | on TZS communication
                   0x206~0x20D | 0x1FFF | on TZS communication
                   0x20E~0x20F | 0x1FEF | on TZS communication
                   0x210~0x211 | 0x1FFF | on TZS communication
                   0x214~0x215 | 0x1FFF | on TZS communication
                         0x217 | 0x1FFF | on TZS communication
                   0x300~0x33F | 0x1FFF | on TZS communication
                   0x341~0x344 | 0x1FFF | on TZS communication
                   0x349~0x3FF | 0x1FFF | on TZS communication
                   0x400~0x47F | 0x1FFF | on TZS communication
                         0x50E | 0x0800 | on TZS communication
                   0x51C~0x57F | 0x1FFF | on TZS communication
                   0x605~0x607 | 0x1FFF | on TZS communication
                   0x700~0x7FF | 0x1FFF | on TZS communication

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. Probably also set to 0x020E020F in first_loader.
0xE007000C 4 Ex: 2.
0xE0070014 4 Set to 6 under some condition in second_loader.

0xE0070000: EmmcCrypto Toggle

Toggle: Set to 1 to enable eMMC crypto, 0 to disable.

0xE0070004: EmmcCrypto availability status

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

0xE0070008: EmmcCrypto keyrings indexes

There are two 16-bit keyrings indexes.

Ex: 0x020E020F (set in 1.69-3.740.011 second_loader): keyrings 0x20E and 0x20F.

Only writeable.

If set to an invalid keyring, eMMC crypto is disabled.

0xE007000C: Unknown

Read value example: 2

0xE00C0000 - Cmep XBar

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