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First Vita Savedata Decryption

Open discussions on programming specifically for the PS Vita.
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dmaskell92
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Re: First Vita Savedata Decryption

Post by dmaskell92 »

God if you could figure out a way to cross save between PCSX2 and Ps Vita that would be amazing! I have the undub version on my PC with widscreen hacks and such. I hope encryption is possible. If you can self convert this to PS3 I can self convert it to PCSX2!
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wth
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Re: First Vita Savedata Decryption

Post by wth »

:lol:
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Keberasky
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Re: First Vita Savedata Decryption

Post by Keberasky »

As far as encrypting goes it may be possible to use the PS3 cross save feature to "encrypt" them if you will. This probably depends on how many checks the remote save servers have. Never the less I have modified a PS3 save before and have used cross save to get it onto the Vita.
nitefia
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Joined: Sat Sep 13, 2014 3:18 pm

Re: First Vita Savedata Decryption

Post by nitefia »

op should try that
siska7421
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Re: First Vita Savedata Decryption

Post by siska7421 »

will I can convert a my psvita savedata for another psn account?
MrFwibbles
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Re: First Vita Savedata Decryption

Post by MrFwibbles »

Can we have some more information about this save? What did you name Tidus, for example?
mr.gas
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Re: First Vita Savedata Decryption

Post by mr.gas »

MrFwibbles wrote:Can we have some more information about this save? What did you name Tidus, for example?
its the same ( tidus ) .. I think its similar to the ps3 ffx saves
cryyifei
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Re: First Vita Savedata Decryption

Post by cryyifei »

mr.gas wrote:
MrFwibbles wrote:Can we have some more information about this save? What did you name Tidus, for example?
its the same ( tidus ) .. I think its similar to the ps3 ffx saves
So encryption algorithm is same? :)
Hykem
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Re: First Vita Savedata Decryption

Post by Hykem »

cryyifei wrote:
mr.gas wrote:
MrFwibbles wrote:Can we have some more information about this save? What did you name Tidus, for example?
its the same ( tidus ) .. I think its similar to the ps3 ffx saves
So encryption algorithm is same? :)
No. This method doesn't involve knowing the algorithm.
Instead, it allows to intercept the destination to where decrypted SAVEDATA is stored in the Vita.

Re-encryption will not be as trivial as some users think because Sony actually learned with past mistakes.
In the files that mr.gas provided you can see that save game data now enforces 4 kinds of encryption/verification:
- sce_pfs: The Vita's file system itself has a protection layer;
- clearsign: This is a key (header of the file is "pfsSKKey", just like in the PS4's save data files) that is used by the protected file system to verify/encrypt/decrypt contents (presumably, in a per block basis);
- ICV: The save game files have individual integrity check value files (or checksums) that are kept and controlled in a database;
- keystone: This key is involved in PKG encryption/decryption/verification and it's highly likely to be used in the first encryption of a save game file.

I guess I should add this information to the devwiki.
mr.gas
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Re: First Vita Savedata Decryption

Post by mr.gas »

it is very helpful .. thanks.
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