What do you mean you want to decipher an xprv / seed? If you have the keystore and the password to unlock it, then you can decrypt everything encrypted in it.
I don't know - I have only .json file and password for it.
Something tells me you bought someone else's wallet which supposedly have coins you try to gain access to. If that's the case, it's most certainly a scam.
These are hex numbers. I need at least seed to be converted to text.
Also xprv is in hex format that modern wallets do not accept.
I have no code to decrypt neither.