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= Location =
IDStorage is located after the IPL on the nand at 0xC0000, and is used to store low-level information on the PSP, such as the serial, [[MAC address]], [[UMD]], WLAN and region. Most idstorage keys have a pair, although some do not (explained later.) Idstorage keys are 512(+16) bytes and are stored in an index of two nand pages (512 bytes.) Nand pages are also 515(+16 spare area) bytes. The index of idstorage is identified by byte 6 of the spare (0x73), byte 7 is the idstorage version, byte is either 1 or 0; depending on whether the idstorage has been formatted or not (???), and finally byte 9 indicates if the idstorage is read-only or not.


== PSP ==
Idstorage keys are 16 bit integers and are stored in the corresponding user areas. For example, a key appearing at position 27 (byte 54) in the index would find its associated data at the location:0xc0000 + (27 * 512) = 0xC3600


IDStorage area is located after the IPL on the NAND at offset 0xC0000.
= Importance to PSP Functions =


= Description =
As major functions such as UMD Decryption, Ad Hoc and DNAS Authentication rely on IDStorage keys, the loss or corruption of keys can be crippling to the usability of the PSP. Users are strongly recommended to take a [[NAND Backup]], giving them the opportunity to restore their IDStorage using a tool such as [[NandTool]].
 
It is used to store low-level information, such as the serial, [[MAC address]], [[UMD]], WLAN and region.
 
The IDStorage area is an associative array and information is stored using key/value pairs (index/leaf). The IDStorage seems a little coupled to the physical storage as each leaf is mapped to an area of 512-byte, which is equal to the pagesize of the PSP standard NAND flash, and it seems 512-byte page operations are intended.
 
= Structure =
 
Idstorage leaves are all 512 bytes. Most IDStorage leaves have a pair, although some do not.
 
Idstorage leaves indexes are 16-bit integers and are stored in an index table of two NAND pages of 512 bytes.
 
* The index is identified by byte 6 of the spare area (0x73).
* byte 7 is the idstorage version.
* byte is either 1 or 0 depending on whether the idstorage has been formatted or not, and finally byte 9 indicates if the idstorage is read-only or not.
 
For example, an index appearing at position 27 (byte 54) in the index table would find its associated data at the NAND offset: 0xC0000 + (27 * 512) = 0xC3600.
 
= Importance in OS =
 
As major functions such as UMD decryption, Ad Hoc and DNAS Authentication rely on IDStorage leaves, the loss or corruption of leaves can be crippling to the usability of the PSP. Users are strongly recommended to take a [[NAND Backup]], giving them the opportunity to restore their IDStorage using a tool such as [[NandTool]].
 
The firmware provides a driver to facilitate manipulations. In PSP: idstorage.prx. In PSVita: idstorage.skprx.


= Generation =
= Generation =
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* together with the idps (called PSID on PSP), the openPSID is also generated on PSP (written to IdStorage).
* together with the idps (called PSID on PSP), the openPSID is also generated on PSP (written to IdStorage).
* there are 12 sections on PSP, unlike the 11 ones on PS3 EID0.
* there are 12 sections on PSP, unlike the 11 ones on PS3 EID0.
= IDStorage certified sections =
IDStorage certified sections are a security measure for critical information. For example PSID and OpenPSID are certified (leaves 0x100, 0x101, 0x120, 0x121). For PSPemu on PS3 and PS Vita, the same sort of certificates are contained in PS3 eEID and PS Vita ID Storage, and Kirk commands are implemented to handle them. Moreover, PS3 eEID certificates use almost the same structure and algorithms, whilst PS Vita extends block sizes from 128 to 192 and 256 bits.
Kirk command 0x12 is used to verify IDStorage certificates.
== Structure ==
{|class="wikitable"
|-
! Name !! Size !! Description
|-
| Data || 0x10 || contains the actual data (either PSID or OpenPSID)
|-
| plaintext public key || 0x28 || contains the certificate's public key (without padding)
|-
| R || 0x14 || part of the ECDSA signature pair (R, S)
|-
| S || 0x14 || part of the ECDSA signature pair (R, S)
|-
| public key || 0x28 || ECDSA public key (unknown what this is doing here)
|-
| encrypted private key || 0x20 || encrypted blob that contains the certificate's private key (with padding)
|-
| omac/cmac1 || 0x10 || hash of the previous information in CMAC1/OMAC mode
|}
<source lang="C">
typedef struct ECDSA160_signature { // size is 0x28
  unsigned char r[0x14];
  unsigned char s[0x14];
} ECDSA160_signature;
typedef struct ids_cert_main_psp { // size is 0xA8
char data[0x10];
char pub_key[0x28]; // ?generated using Kirk command 0xC? sent to Kirk command 0x11 for verification
ECDSA160_signature signature;
char constant_pub_key[0x28]; // hardcoded constant, same in all PSP consoles but depends on the certificate index in ID Storage
char enc_priv_key[0x20]; // decrypted and verified by Kirk command 0x10
} ids_cert_main_psp;
typedef struct ids_cert_psp { // size is 0xB8
ids_cert_main_psp cert_data; // data input for generating enc_aes_cmac_hash
char aes_cmac[0x10]; // verified by Kirk command 0x12
} ids_cert_psp;
</source>
= Content =
* Leaves 0x100-0x11F are identical to their backup leaves 0x120-0x13F
* Old PSP revision haven't leaves 0x046, 0x047
* Very old PSP revisions haven't leaf 0x140
* Leaf 0x50 is maybe Serial Number


= Uses =
= Uses =
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== IPL ==
== IPL ==


The Stage 2 [[IPL]] (main.bin) reads 3 leaves, 0x004, 0x005 and 0x006. These leaves play a significant part in the PSP as they are related to power. In TA-082 and TA-086 PSP's, these leaves are at different locations, causing a brick with the 1.50 IPL.
The Stage 2 [[IPL]] (main.bin) reads 3 keys from the idstorage, 0x004, 0x005 and 0x006. These keys play a significant part in the PSP as they are related to power. In TA-082 and TA-086 PSP's, these keys are at different locations, causing a brick with the 1.50 IPL.


0x004
0x004
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=== sceChkregGetPsCode ===
=== sceChkregGetPsCode ===


Chkreg (chkreg.prx) reads 2 leaves, 0x100 and 0x102 or 0x120 and 0x122.
Chkreg (chkreg.prx) reads 2 keys... 0x100 and 0x102 or 0x120 and 0x122 all contain the return of sceChkregGetPsCode 3 times.
 
exempl of PsCode: 0x00 0x00 0x00 0x01 0x00 0x03 0x00 0x01
It gets PSID from the IdStorage and convert it to PsCode.
 
Example of PSP PsCode: 00 00 00 01 00 03 00 01
 
The return from sceChkregGetPsCode is determined to be valid or invalid via KIRK command 0x12, just like other functions using leaves 0x100, 0x120.


== openpsid.prx ==
== openpsid.prx ==
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=== sceOpenPSIDGetPSID ===
=== sceOpenPSIDGetPSID ===


sceOpenPSIDGetPSID first reads leaf 0x100 or 0x120 into a buffer using sceIdStorageLookup with the following args:
0000000048                          00 00 00 01 00 '''03''' 00 01          ........
0000000240  00 00 00 01 00 '''03''' 00 01                          ........       
0000000416                          00 00 00 01 00 '''03''' 00 01          ........
('''Highlighted Byte''' - 01 for Development Tool, 02 for Testing Tool, 03 for Japan, 04 for USA, 05 for Europe/Africa, 06 for Korea, 09 for Australia/New Zealand, 0A for Hong Kong and Singapore, 0E for DTP-L1500)


sceIdStorageLookup(0x120, 0x38, buf, 0xB8); // ???offset to check???
The rest of key is filled with random data, which is unique to each PSP. If this data is changed, sceChkregGetPsCode will return: 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00, meaning an invalid region. The data above is also the return of getpscode inside vshbridge.prx and chkreg.prx. The return from sceChkregGetPsCode is determined to be valid or invalid via sceUtilsBufferCopyWithRange and OpenPSID... sceOpenPSIDGetPSID first reads 0x100 or 0x120 into a buffer, this buffer is then sent to sceUtilsBufferCopyWithRange (the same as OpenPSID) with the following args:


The buffer is then sent to KIRK using sceUtilsBufferCopyWithRange with the following args:
sceUtilsBufferCopyWithRange(0, 0, scrambled_buf, 0xB8, 0x12);


  sceUtilsBufferCopyWithRange(0, 0, buf, 0xB8, 0x12);
  Arg 1 - Destination. ??
Arg 2 - size. ??
Arg 3 - Buffer 0x100 or 0x120 was read into and is 512 bytes.
Arg 4 - Length. ??
Arg 5 - KIRK key


It sends data to 2 modules: OpenPSID and memab. Once the scrambled buffer has been sent, "some check" is performed.
It sends data to 2 modules, these are OpenPSID and memab. Once the scrambled buffer has been sent, "some check" is performed. If sceUtilsBufferCopyWithRange is sucessful, this part of sceChkregGetPsCode returns 0, else it returns 0x80000108.


If sceUtilsBufferCopyWithRange is sucessful, this part of sceChkregGetPsCode returns 0, else it returns 0x80000108.


=== sceOpenPSIDGetOpenPSID ===
sceOpenPSIDGetPSID reads 0x120 using sceIdStorageLookup with the following args:


OpenPSID (openpsid.prx) reads 2 leaves, both relating to the region: 0x101 or 0x121 and 0x102 or 0x122. The OpenPSID is calculated via the above leaves and sceUtilsBufferCopyWithRange.
sceIdStorageLookup(0x120, 0x38, scrambled_buf, 0xB8);
Arg 1 - Idstorage key.
Arg 2 - Offset within the 512 byte leaf. The 1st occurrence of the region (sceChkregGetPsCode) is at 0x38, the second at 0xF0 and the third at 0x1A8. Each occurrence is 0xAF (175 bytes) apart.
Arg 3 - Buffer.
Arg 4 - Length.


It first reads 0x101 or 0x121 into a buffer. If this fails it returns 0xC0520001 and reads 0x102 or 0x122 into the buffer. If it fails again, it returns 0xC0520002.
=== sceOpenPSIDGetOpenPSID ===


The buffer is then passed to sceUtilsBufferCopyWithRange with the following args:
OpenPSID (openpsid.prx) reads 2 keys, both relating to the region: 0x101 or 0x121 and 0x102 or 0x122. The OpenPSID is calculated via the above keys and sceUtilsBufferCopyWithRange. It first reads 0x101 or 0x121 into a buffer, if this fails it returns 0xC0520001 and reads 0x102 or 0x122 into the buffer, if thisfails again, it returns 0xC0520002. This is then passed to sceUtilsBufferCopyWithRange with the following args:


  sceUtilsBufferCopyWithRange(0, 0, buf, 0xB8, 0x12);
  sceUtilsBufferCopyWithRange(0, 0, buf, 0xB8, 0x12);


If the sceUtilsBufferCopyWithRange returns 1, OpenPSID returns 0xC0520001, else it returns 0.
The args are explained above.
If the function returns 1, OpenPSID returns 0x0xC0520001, else it returns 0.


== Memab ==
==Memab==


Memab (memab.prx) reads 1 leaf, 0x100 or 0x120.
Memab (memab.prx) reads 1 key... once again being 0x100 or 0x120.


Mgr (mgr.prx) reads 2 leaves, 0x040 and another unknown leaf.
Mgr (mgr.prx) reads 2 keys.


0x040
0x040
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  00000001F0  25 00 00 00 64 99 2E 88-01 00 00 00 D0 99 2E 88  %...d...........
  00000001F0  25 00 00 00 64 99 2E 88-01 00 00 00 D0 99 2E 88  %...d...........


Another unknown leaf.
Another unknown key.


== Power ==
==Power==


Power (power.prx) reads 1 leaf, 0x0004. This leaf is related to power and is also read by the IPL.
Power (power.prx) reads 1 key, 0x0004. This key is related to power and is also read by the IPL.


== Umdman ==
==Umdman==


Umdman (umdman.prx) reads 5 leafs, 0x102, 0x103, 0x104, 0x105, 0x106, 0x107. The leaf 0x102 is related to the region, and is probably used to determine what UMD video's can be read on the PSP.
Umdman (umdman.prx) reads 1 key, 0x102. This key is related to the region, and is probably used to determine what UMD video's can be read on the PSP.


== USB ==
==USB==


=== usb.prx ===
===usb.prx===


USB (usb.prx) reads 1 leaf, 0x041. This leaf has information on the USB types.
USB (usb.prx) reads 1 key, 0x041. This key has information on the USB types.


0x041
0x041
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                                       0x65 0x00 0x20 0x00 0x45
                                       0x65 0x00 0x20 0x00 0x45


=== usbstor.prx ===
===usbstor.prx===


USBstor (usbstor.prx) reads 1 leaf, ?0x040 or 0x043?.
USBstor (usbstor.prx) reads 1 key, 0x043.


?0x040 or 0x043?
0x040
  0000000000  55 73 74 72 53 6F 6E 79-20 20 20 20 50 53 50 20  UstrSony    PSP  
  0000000000  55 73 74 72 53 6F 6E 79-20 20 20 20 50 53 50 20  UstrSony    PSP  
  0000000016  20 20 20 20 20 20 20 20-20 20 20 20 31 2E 30 30              1.00
  0000000016  20 20 20 20 20 20 20 20-20 20 20 20 31 2E 30 30              1.00
  0000000032  50 00 53 00 50 00 00 00-00 00 00 00 00 00 00 00  P.S.P...........  
  0000000032  50 00 53 00 50 00 00 00-00 00 00 00 00 00 00 00  P.S.P...........  


== WLAN ==
==WLAN==


WLAN (wlan.prx) reads 2 leaves, 0x044 and 0x045.
WLAN (wlan.prx) reads 2 keys, 0x044 and 0x045.


0x044
0x044
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  0000000000  03 00 01                                        ...             
  0000000000  03 00 01                                        ...             


These leaves contains the MAC address of the PSP. This can be changed, but does not effect the hardware, only the address displayed under System Information.
This key contains the MAC address of the PSP. This can be changed, but does not effect the hardware, only the address displayed under System Information.


== Sysconf_plugin ==
==Sysconf_plugin==


Sysconf_plugin (sysconf_plugin.prx) reads 1 leaf, 0x044. This is probably why the VSH displays a different MAC address when leaves 0x044/0x045 are changed.
Sysconf_plugin (sysconf_plugin.prx) reads 1 key, 0x044. This is probably why the VSH displays a different MAC address when 0x044 is changed.


== Vshmain ==
==Vshmain==


Vshmain (vshmain.prx) reads 1 leaf, 0x046.
Vshmain (vshmain.prx) reads 1 key, 0x046.


0x046
0x046
  Empty, however vshmain uses the first byte of this leaf to set a param for vshImposeSetParam.  
  Empty, however vshmain uses the first byte of this key to set a param for vshImposeSetParam.  


= Legality of distribution =
= Legality of Distribution =


There is question as to whether [[Sony]] are able to take legal action against those found to be distributing IDStorage leaves among the community, for research, repair, or otherwise. The worry is that the leaves are proprietary data (particularly UMD decryption leaves).
There is question as to whether [[Sony]] are able to take legal action against those found to be distributing IDStorage keys among the community, for research, repair, or otherwise. The worry is that the keys are proprietary data (particularly UMD Decryption keys).


= Useful links =
= Useful links =


* [https://github.com/esxgx/uofw/blob/master/src/lowio/nand.c]
* [https://gigawiz.github.io/yapspd/html_chapters_split/chap19.html#sec19.2.4]
* [https://xero1.wordpress.com/2007/01/06/hello-world/]
* [https://xero1.wordpress.com/2007/01/06/hello-world/]
* [https://www.elotrolado.net/hilo_referencia-sobre-el-idstorage_839995]
* [https://www.elotrolado.net/hilo_referencia-sobre-el-idstorage_839995]
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