I'm looking for a tool similar to Veracrypt, Boxcryptor or Cryptomator which runs on the Raspberry Pi 4 (armv8). The above mentioned apps don't seem to support the arm architecture (or at least not v8). I want to create an encrypted container file which I could mount when needed and put files in it. Needs to run without network access.
Veracrypt does support ARM: check out Contributed Resources. The Pi 4 can run ARMv7 code just fine.
Of course, you can always build an open-source program for any CPU architecture you like, e.g. ARMv8. Since Pi 4 CPU does not support the AES extensions (
armv8-a+crypto), making an ARMv8 Veracrypt build will not achieve anything in terms of performance, besides ruining compatibility with ARMv7.