github.com/nknorg/encrypted-stream

encrypted-stream

Encrypted-stream is a Golang library that transforms any net.Conn or io.ReadWriter stream to an encrypted and/or authenticated stream.

• The encrypted stream implements net.Conn and io.ReadWriter and can be used as drop-in replacement.

• Works with any encryption, authentication, or authenticated encryption algorithm or even arbitrary transformation. Only a cipher that implements encrypt/decrypt needs to be provided. XSalsa20-Poly1305 and AES-GCM are provided as reference cipher.

• The encrypted stream only adds a small constant memory overhead compared to the original stream.

Note: this library does not handle handshake or key exchange. Handshake should be done separately before using this library to compute a shared key.

Documentation

Full documentation can be found at GoDoc.

Usage

Assume you have a net.Conn and you want to transform it into an encrypted net.Conn:

conn, err := net.Dial("tcp", "host:port")

You first need to have a shared key at both side of the connection (e.g. derived from key exchange algorithm). Then all you need to do is to choose or implements a cipher:

encryptedConn, err := stream.NewEncryptedStream(conn, &stream.Config{
  Cipher: stream.NewXSalsa20Poly1305Cipher(&key),
  SequentialNonce: true, // only when key is unique for every stream
  Initiator: true, // only on the dialer side
})

Now you can use encryptedConn just like conn, but everything is encrypted and authenticated.

See stream_test.go for complete example and benchmark with TCP connection.

Benchmark

$ go test -v -bench=. -run=^$
goos: darwin
goarch: amd64
pkg: github.com/nknorg/encrypted-stream
BenchmarkPipeXSalsa20Poly1305-12    	    4064	    266725 ns/op	 491.41 MB/s	       3 B/op	       0 allocs/op
BenchmarkPipeAESGCM128-12           	   16195	     71669 ns/op	1828.86 MB/s	       0 B/op	       0 allocs/op
BenchmarkPipeAESGCM256-12           	   14328	     83337 ns/op	1572.79 MB/s	       0 B/op	       0 allocs/op
BenchmarkTCPXSalsa20Poly1305-12     	    6489	    185980 ns/op	 704.76 MB/s	       0 B/op	       0 allocs/op
BenchmarkTCPAESGCM128-12            	   20089	     59684 ns/op	2196.08 MB/s	       0 B/op	       0 allocs/op
BenchmarkTCPAESGCM256-12            	   17656	     67721 ns/op	1935.48 MB/s	       0 B/op	       0 allocs/op
PASS
ok  	github.com/nknorg/encrypted-stream	9.997s

Contributing

Can I submit a bug, suggestion or feature request?

Yes. Please open an issue for that.

Can I contribute patches?

Yes, we appreciate your help! To make contributions, please fork the repo, push your changes to the forked repo with signed-off commits, and open a pull request here.

Please sign off your commit. This means adding a line "Signed-off-by: Name " at the end of each commit, indicating that you wrote the code and have the right to pass it on as an open source patch. This can be done automatically by adding -s when committing:

git commit -s

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