2019-07-18 03:11:34 +08:00
|
|
|
# External flash
|
2021-12-31 17:55:16 +08:00
|
|
|
<a id="Top"></a>
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
External 256kbytes flash is a unique feature of the RDV4 edition.
|
|
|
|
|
|
2021-12-31 17:55:16 +08:00
|
|
|
# Table of Contents
|
|
|
|
|
- [External flash](#external-flash)
|
|
|
|
|
- [Table of Contents](#table-of-contents)
|
|
|
|
|
- [Addresses](#addresses)
|
|
|
|
|
- [Layout](#layout)
|
|
|
|
|
- [Page3 Layout](#page3-layout)
|
|
|
|
|
- [RSA signature](#rsa-signature)
|
|
|
|
|
- [backup first!](#backup-first)
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
2019-07-18 03:11:34 +08:00
|
|
|
## Addresses
|
2021-12-31 17:55:16 +08:00
|
|
|
^[Top](#top)
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
Flash memory is
|
|
|
|
|
|
2023-04-06 20:54:00 +08:00
|
|
|
* 256KB (0x40000= 262144)
|
|
|
|
|
* divided into 4 pages of 64KB (0x10000 = 65536)
|
|
|
|
|
* 4 pages divided into 16 sectors of 4KB (0x1000 = 4096), so last sector is at 0x3F000
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
Therefore a flash address can be interpreted as such:
|
|
|
|
|
```
|
|
|
|
|
0xPSxxx e.g. 0x3FF7F
|
|
|
|
|
^ page ^ page 3
|
|
|
|
|
^ sector ^ sector 0xF
|
|
|
|
|
^^^ offset ^^^ offset 0xF7F
|
|
|
|
|
```
|
|
|
|
|
|
|
|
|
|
## Layout
|
2021-12-31 17:55:16 +08:00
|
|
|
^[Top](#top)
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
Page 0:
|
|
|
|
|
* available for user data
|
|
|
|
|
* to dump it: `mem dump f page0_dump o 0 l 65536`
|
|
|
|
|
* to erase it: `mem wipe p 0`
|
|
|
|
|
|
|
|
|
|
Page 1:
|
|
|
|
|
* available for user data
|
|
|
|
|
* to dump it: `mem dump f page1_dump o 65536 l 65536`
|
|
|
|
|
* to erase it: `mem wipe p 1`
|
|
|
|
|
|
|
|
|
|
Page 2:
|
|
|
|
|
* available for user data
|
|
|
|
|
* to dump it: `mem dump f page2_dump o 131072 l 65536`
|
|
|
|
|
* to erase it: `mem wipe p 2`
|
|
|
|
|
|
|
|
|
|
Page 3:
|
|
|
|
|
* used by Proxmark3 RDV4 specific functions: flash signature and keys dictionaries, see below for details
|
|
|
|
|
* to dump it: `mem dump f page3_dump o 196608 l 65536`
|
|
|
|
|
* to erase it:
|
2021-03-07 15:56:36 +08:00
|
|
|
* **Beware** it will erase your flash signature so better to back it up first as you won't be able to regenerate it by yourself!
|
|
|
|
|
* edit the source code to enable Page 3 as a valid input in the `mem wipe` command.
|
2019-07-18 03:11:34 +08:00
|
|
|
* Updating keys dictionaries doesn't require to erase page 3.
|
|
|
|
|
|
|
|
|
|
## Page3 Layout
|
2021-12-31 17:55:16 +08:00
|
|
|
^[Top](#top)
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
Page3 is used as follows by the Proxmark3 RDV4 firmware:
|
|
|
|
|
|
|
|
|
|
* **MF_KEYS**
|
|
|
|
|
* offset: page 3 sector 9 (0x9) @ 3*0x10000+9*0x1000=0x39000
|
|
|
|
|
* length: 2 sectors
|
|
|
|
|
|
|
|
|
|
* **ICLASS_KEYS**
|
|
|
|
|
* offset: page 3 sector 11 (0xB) @ 3*0x10000+11*0x1000=0x3B000
|
|
|
|
|
* length: 1 sector
|
|
|
|
|
|
|
|
|
|
* **T55XX_KEYS**
|
|
|
|
|
* offset: page 3 sector 12 (0xC) @ 3*0x10000+12*0x1000=0x3C000
|
|
|
|
|
* length: 1 sector
|
|
|
|
|
|
|
|
|
|
* **T55XX_CONFIG**
|
|
|
|
|
* offset: page 3 sector 13 (0xD) @ 3*0x10000+13*0x1000=0x3D000
|
|
|
|
|
* length: 1 sector (actually only a few bytes are used to store `t55xx_config` structure)
|
|
|
|
|
|
|
|
|
|
* **RSA SIGNATURE**, see below for details
|
2021-03-07 15:56:36 +08:00
|
|
|
* offset: page 3 sector 15 (0xF) offset 0xF7F @ 3*0x10000+15*0x1000+0xF7F=0x3FF7F (decimal 262015)
|
2019-07-18 03:11:34 +08:00
|
|
|
* length: 128 bytes
|
|
|
|
|
* offset should have been 0x3FF80 but historically it's one byte off and therefore the last byte of the flash is unused
|
|
|
|
|
|
|
|
|
|
## RSA signature
|
2021-12-31 17:55:16 +08:00
|
|
|
^[Top](#top)
|
2019-07-18 03:11:34 +08:00
|
|
|
|
|
|
|
|
To ensure your Proxmark3 RDV4 is not a counterfeit product, its external flash contains a RSA signature of the flash unique ID.
|
|
|
|
|
You can verify it with: `mem info`
|
|
|
|
|
|
2021-03-07 17:18:50 +08:00
|
|
|
|
|
|
|
|
Here below is a sample output of a RDV4 device.
|
2019-07-18 03:11:34 +08:00
|
|
|
```
|
2021-03-07 17:18:50 +08:00
|
|
|
[usb] pm3 --> mem info
|
|
|
|
|
|
|
|
|
|
[=] --- Flash memory Information ---------
|
|
|
|
|
[=] ID................... 25AD99A782A867D5
|
|
|
|
|
[=] SHA1................. 67C3B9BA2FA90AD4B283926B70017066C082C156
|
|
|
|
|
[+] Signature............ ( ok )
|
|
|
|
|
|
|
|
|
|
[=] --- RDV4 RSA signature ---------------
|
|
|
|
|
[=] C7C7DF7FA3A2391A2B36E97D227C746ED8BB475E8766F54A13BAA9AAB29299BE
|
|
|
|
|
[=] 37546AACCC29157ABF8AFBF3A1CFB24275442D565F7E996C6B08090528ADE25E
|
|
|
|
|
[=] ED1498E3089C72C68348D83CBD13F1247327BDBC9D75B09ECE3E051E19FE19BB
|
|
|
|
|
[=] 98CB038757F2EDFD2DC5060D05C3296BC19A6F768290D555DFD50407E0E13A70
|
|
|
|
|
|
|
|
|
|
[=] --- RDV4 RSA Public key --------------
|
|
|
|
|
[=] Len.................. 128
|
|
|
|
|
[=] Exponent............. 010001
|
|
|
|
|
[=] Public key modulus N
|
|
|
|
|
[=] E28D809BF323171D11D1ACA4C32A5B7E0A8974FD171E75AD120D60E9B76968FF
|
|
|
|
|
[=] 4B0A6364AE50583F9555B8EE1A725F279E949246DF0EFCE4C02B9F3ACDCC623F
|
|
|
|
|
[=] 9337F21C0C066FFB703D8BFCB5067F309E056772096642C2B1A8F50305D5EC33
|
|
|
|
|
[=] DB7FB5A3C8AC42EB635AE3C148C910750ABAA280CE82DC2F180F49F30A1393B5
|
|
|
|
|
|
|
|
|
|
[+] RSA public key validation.... ( ok )
|
|
|
|
|
[+] RSA private key validation... ( ok )
|
|
|
|
|
[+] RSA verification..... ( ok )
|
|
|
|
|
[+] Genuine Proxmark3 RDV4 signature detected
|
2019-07-18 03:11:34 +08:00
|
|
|
```
|
|
|
|
|
|
2021-03-07 17:18:50 +08:00
|
|
|
# backup first!
|
2021-12-31 17:55:16 +08:00
|
|
|
^[Top](#top)
|
|
|
|
|
|
2021-03-07 15:56:36 +08:00
|
|
|
To make a backup of the signature to file:
|
2021-03-07 17:18:50 +08:00
|
|
|
|
2024-03-10 03:41:48 +08:00
|
|
|
`mem dump -f flash_signature_dump -o 262015 -l 128`
|
2019-07-18 03:11:34 +08:00
|
|
|
|
