Headers

Structure

The full header is 64 bytes - it contains relevant information about the encrypted data.

  • The first two bytes of each header should contain 0xDE - this signifies that it is indeed a Dexios file.
  • The next two bytes signify the header version - as of v8.0.0, this is 0x01
  • The next two bytes contain the encryption algorithm, such as XChaCha20-Poly1305
  • The next two bytes contain the encryption mode, which is either stream or memory
  • The next 16 bytes contain the salt used for argon2id
  • We then have 16 bytes of empty space, this has the potential to store more information in later versions
  • We then have the n byte nonce length - this is determined by the encryption algorithm and encryption mode
  • We finally have enough zeroes to reach 64 bytes - this is extra empty space that may be used in later revisions

Stripping

Headers are stripped by zeroing out the first 64 bytes of the file - this is where the header is stored.

Dumping

Headers are dumped by reading the first 64 bytes of the input file, and writing them to the output file.

Restoring

Headers are restored by reading the first 64 bytes of the provided input file, and writing them to the first 64 bytes of the output file.