This is a port of the Java version of Hybrid Backup Sync entirely written in go, small in size (< 3MB) and fast. It currently supports only QNAP HBS version 2 and OpenSSL ciphered files.
hbsdec (options) file1 directory2 ...
Options:
-o string
output directory (optional)
-p string
password for decryption
-r traverse directories recursively
-v verbose
docker build -t hbsdec .
docker run --rm -it -v hostdirA:/in -v hostdirB:/out hbsdec -r -o /out /in
Tool under GNU version 3 license.