I have an encrypted share folder on my synology NAS DS413 (which uses ecryptfs). I can manually mount the encrypted folder and read the decrypted files without issue, using synologies GUI. For some reason, I have never been able to mount the encrypted folder using my passphrase . But I can always do it by using the private key generated during ecryptfs setup.
So I have since been doing some research on decrypting the encrypted files without a synology (for example if this thing catches fire or is stolen and I need to restore from backup). I've read several threads and howto's on decrypting synology/ecryptfs encrypted shares using linux and encryptfs-utils. But the howto always tells you to provide the passphrase and never mention the use of the key for decryption. So my question is how do I decrypt using the key (which works to mount and decrypt with synology's software)? The key I have is 80 bytes and is binary. The first 16 bytes are integers only and the remaining bytes appear to be random hex.
Thanks for any tips!