Editing HDD Encryption
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[[Category:Software]] | |||
=Introduction= | =Introduction= | ||
* The following information was reverse engineered from LV1, Storage Manager in LPAR1 and sb_iso_spu_module.self. | * The following information was reverse engineered from LV1, Storage Manager in LPAR1 and sb_iso_spu_module.self. | ||
* I'm able to decrypt/encrypt my PS3 HDD and VFLASH on PC now. | * I'm able to decrypt/encrypt my PS3 HDD and VFLASH on PC now. | ||
=HDD Encryption= | =HDD Encryption= | ||
* XTS-AES-128 is used to encrypt all data on PS3 HDD. | * XTS-AES-128 is used to encrypt all data on PS3 HDD. | ||
* XTS is NOT CBC!!! It's AES-ECB with tweak XORing. AES-CBC is impractical for HDD encryption. Each sector can be encrypted/decrypted | * XTS is NOT CBC !!! It's AES-ECB with tweak XORing. AES-CBC is impractical for HDD encryption. Each sector can be encrypted/decrypted independantly from other HDD sectors. | ||
* Good paper about XTS-AES: http://ntnu.diva-portal.org/smash/get/diva2:347753/FULLTEXT01 | * Good paper about XTS-AES: http://ntnu.diva-portal.org/smash/get/diva2:347753/FULLTEXT01 | ||
* VFLASH is encrypted twice. First with ENCDEC keys and then with ATA keys. | * VFLASH is encrypted twice. First with ENCDEC keys and then with ATA keys. | ||
* Tweak and data XTS keys are of size 32 bytes but only the first 16 bytes are used. | * Tweak and data XTS keys are of size 32 bytes but only the first 16 bytes are used. | ||
* '''You can set and clear ATA keys with my Linux ps3encdec device driver which | * '''You can set and clear ATA keys with my Linux ps3encdec device driver which i use to test HDD/VFLASH encryption. But be careful, never set/clear ATA keys while some HDD regions/partitions are mounted !!! You will corrupt your data on your HDD !!!''' | ||
=Dumping ATA Keys= | =Dumping ATA Keys= | ||
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* I modified sb_iso_spu_module.self to dump ATA keys. | * I modified sb_iso_spu_module.self to dump ATA keys. | ||
* ATA keys are passed as parameters to sb_iso_spu_module.self. | * ATA keys are passed as parameters to sb_iso_spu_module.self. | ||
==Program== | ==Program== | ||
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==Test== | ==Test== | ||
* To test your ATA XTS tweak and data keys, you need encrypted HDD sectors. You can either connect your HDD to PC and dump it or use my ps3vuart-tools on Linux and clear ATA keys and then dump it from ps3da. I tried both methods. But make sure you unmount all HDD regions before using ps3vuart-tools to clear your ATA keys | * To test your ATA XTS tweak and data keys, you need encrypted HDD sectors. You can either connect your HDD to PC and dump it or use my ps3vuart-tools on Linux and clear ATA keys and then dump it from ps3da. I tried both methods. But make sure you unmount all HDD regions before using ps3vuart-tools to clear your ATA keys. | ||
* I coded a small application which implements XTS-AES encryption/decryption. | * I coded a small application which implements XTS-AES encryption/decryption. | ||
Result with 1st encrypted sector from HDD: | Result with 1st encrypted sector from HDD: | ||
<pre> | <pre> | ||
glevand@debian:~/xts_aes$ cat ../hdd_1st_sector_enc.bin | | glevand@debian:~/xts_aes$ cat ../hdd_1st_sector_enc.bin | ./xts_aes -d -k <your ATA XTS data key> -t <your ATA XTS tweak key> -s 0 -r | hexdump -C | ||
00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| | 00000000 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 |................| | ||
00000010 00 00 00 00 0f ac e0 ff 00 00 00 00 de ad fa ce |................| | 00000010 00 00 00 00 0f ac e0 ff 00 00 00 00 de ad fa ce |................| | ||
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* metldr passes to lv1ldr AES-CBC-256 IV and key which are used to compute ENCDEC keys. | * metldr passes to lv1ldr AES-CBC-256 IV and key which are used to compute ENCDEC keys. | ||
* I tested my ENCDEC keys with my ps3encdec Linux driver and set them again, and VFLASH was still working fine. As soon as i changed some bits in these keys, VFLASH could not be decrypted properly anymore :) It means keys are correct. | * I tested my ENCDEC keys with my ps3encdec Linux driver and set them again, and VFLASH was still working fine. As soon as i changed some bits in these keys, VFLASH could not be decrypted properly anymore :) It means keys are correct. | ||
==ENCDEC Key Seeds== | ==ENCDEC Key Seeds== | ||
* Use the dumped ENCDEC IV and key to encrypt these seeds and you will get your ENCDEC keys for VFLASH. | * Use the dumped ENCDEC IV and key to encrypt these seeds and you will get your ENCDEC keys for VFLASH. | ||
* You can find these seeds in | * You can find these seeds in lv1ldr. | ||
Tweak key seed: | |||
<pre> | <pre> | ||
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</pre> | </pre> | ||
Data key seed: | |||
<pre> | <pre> | ||
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... | ... | ||
</pre> | </pre> | ||