Looking for reverse-engineering partner for DiskCryptor

[Mateusz Jończyk <mat.jonczyk@xxxxx>]

Hello,

I'm trying to implement support for opening DiskCryptor partitions. DiskCryptor is licensed under GPLv3, which is incompatible with libcryptsetup's LGPL2+. I'd therefore prefer not to read DiskCryptor source code. I'm asking for someone to do this and provide some information - mostly about header encryption ATM.

I tried to reverse-engineer the format from public info:

• https://diskcryptor.org/volume/
• https://security.stackexchange.com/a/83792
  

and by trial and error, but failed.

I've tried the following (with many variations) on a FAT partition encrypted with AES:

1. Password is encoded as an ASCII string.
2. This ASCII string is hashed with PBKDF2 with the following parameters:
   
   • hash: sha512
   • salt - 64 bytes from start of the volume header,
   • output size: 64 or perhaps 192 bytes,
   • 1000 iterations.
3. Encryption key consists of the first or perhaps last 64 bytes (512 bits) of the output of PBKDF2.
4. Bytes 64 - 2048 of the header are encrypted with AES cipher in XTS mode:
• decryption starts from byte 64,
• IV is 16 bytes long.
  

Code could be found at https://github.com/DavidXanatos/DiskCryptor/ . Thank you in advance.

Greetings,

Mateusz Jończyk

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