Re: Decrypt AES(rijndael) file

[Vladimir 'phcoder' Serbinenko]

Le Mon, Jul 10, 2017 à 8:38 PM, Rafael Machado <address@hidden> a écrit :

Hi everyone

I need to find a way to decrypt a file at grub, and this file is encrypted as AES256 (rijndael).

This is far from being a complete task description. What do you want to do with decrypted content? What is cipher mode? ECB? CBC? XTS? CTR? GCM? Which IV? Where does the key come from? Password? Key file? Result of some computation? Which key derivation? PBKDF2? scrypt? Number of iterations?

Please specify your task more exactly. Even better detail what you want to accomplish. What is your end goal?

As far as I could check at grub source code, there is a lib (lib/libgcrypt-grub/cipher/rijndael.c), that implements this algorithm, for encryption and decryption.

Is there any existing command that I could do this decryption? (I tried but didn't find anything like this. Just partitions decryption seems to be supported, not files decryption.)

I was able to compile grub and insmod the gcry_rijndael.mod, but was not able to do anything with this mod (command). Is there any dependence this mod need to have installed to make something?

Thanks and Regards

Rafael Machado

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