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GoCryptFS [](https://travis-ci.org/rfjakob/gocryptfs)
==============
An encrypted overlay filesystem written in Go.
gocryptfs is built on top the excellent
[go-fuse](https://github.com/hanwen/go-fuse) FUSE library and its
LoopbackFileSystem API.
This project was inspired by [EncFS](https://github.com/vgough/encfs)
and strives to fix its security issues (see EncFS tickets 9, 13, 14, 16).
For details on the security of gocryptfs see the
[SECURITY.md](SECURITY.md) document.
Current Status
--------------
* Feature-complete and working
* Passes the fuse-xfstests "generic" tests with one exception, results: [XFSTESTS.md](XFSTESTS.md)
* A lot of work has gone into this. The testing has found bugs in gocryptfs
as well as in go-fuse.
* The one exception is generic/035. This is a limitation in go-fuse,
check out https://github.com/hanwen/go-fuse/issues/55 for details.
* However, gocryptfs needs more real-world testing - please report any issues via github.
* Only Linux operation has been tested. Help wanted for Mac OS X verification.
Install
-------
$ go get github.com/rfjakob/gocryptfs
Use
---
Quickstart:
$ mkdir cipher plain
$ $GOPATH/bin/gocryptfs --init cipher
[...]
$ $GOPATH/bin/gocryptfs cipher plain
[...]
$ echo test > plain/test.txt
$ ls -l cipher
total 8
-rw-rw-r--. 1 user user 33 7. Okt 23:23 0ao8Hyyf1A-A88sfNvkUxA==
-rw-rw-r--. 1 user user 233 7. Okt 23:23 gocryptfs.conf
$ fusermount -u plain
See [MANPAGE.md](MANPAGE.md) for a description of available options.
Storage Overhead
----------------
* Empty files take 0 bytes on disk
* 18 byte file header for non-empty files (2 bytes version, 16 bytes random file id)
* 28 bytes of storage overhead per 4kB block (12 byte nonce, 16 bytes auth tag)
Performance
-----------
* uses openssl through [spacemonkeygo/openssl](https://github.com/spacemonkeygo/openssl)
for a 3x speedup compared to `crypto/cipher` (see [go-vs-openssl.md](openssl_benchmark/go-vs-openssl.md) for details
Run `./benchmark.bash` to run the test suite and the streaming read/write
benchmark. The benchmark is run twice, first with native Go crypto and
second using openssl.
The output should look like this:
$ ./benchmark.bash
[...]
BenchmarkStreamWrite 100 11816665 ns/op 88.74 MB/s
BenchmarkStreamRead 200 7848155 ns/op 133.61 MB/s
ok github.com/rfjakob/gocryptfs 9.407s
Changelog
---------
v0.4 (in progress)
* Add `--plaintextnames` command line option
* Can only be used in conjunction with `--init` and disables filename encryption
(added on user request)
* Add `FeatureFlags` config file paramter
* This is a config format change, hence the on-disk format is incremented
* Used for ext4-style filesystem feature flags. This should help avoid future
format changes.
* On-disk format 2
v0.3
* Add file header that contains a random id to authenticate blocks
* This is an on-disk-format change
* On-disk format 1
v0.2
* Replace bash daemonization wrapper with native Go implementation
* Better user feedback on mount failures
v0.1
* First release
* On-disk format 0
See https://github.com/rfjakob/gocryptfs/releases for the release dates
and associated tags.
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