gosss

gosss is a tool for splitting/combining files using shamir algorithm More on wikipedia
This project can be used either as a tool or as a library
It allows to split and combine large files rather than tiny strings

Idea

The initial idea has been taken form HashiCorp shamir splitter and somewhere rewritten
The main goal is to add ability to split/combine large files by slightly modified block-aware algorithm

build

$ make

cross build

You can cross-compile gosss for different platforms using command $ make build-cross
It will create _dist folder with binaries for various platforms

install

$ sudo make install

using

$ gosss --help

Usage examples

Split file test to six parts with combine threshold 3:
$ gosss split -i test -d parts -p 'test-%i.part' -s 6 -t 3

Combine parts back to one file:
$ gosss combine -d parts -p 'test-%i.part' -o combined

Check that checksums are equal:
$ sha256sum test combined

--input / --output args can be omitted or equal to '-'. In that case input/output file will be read/written from/to stdin/stdout:
$ gosss combine -d parts -p 'test-%i.part' will output file to stdout

Combine tries to search all files matching the specified --pattern. Operation will be successful only if there are enough files found (more then or equal to threshold)
Default --pattern is just %i. Default --dir is a current dir