add "go.mod"

.travis.yml

@@ -1,18 +1,20 @@
 sudo: false
 language: go
-go:
-  - 1.9
-  - 1.9.1
-  - 1.9.2
-  - 1.9.3
-  - 1.9.4
-  - 1.9.5
-  - 1.10.1
+matrix:
+  include:
+  - go: "1.9.x"
+  - go: "1.10.x"
+  - go: "1.11.x"
+
+env:
+  - GO111MODULE=on
+
 before_install:
   - go get -v ./...
   - go get github.com/stretchr/testify/assert
   - go get github.com/modocache/gover
   - go get github.com/mattn/goveralls
+
 script:
   - go test -coverprofile=crypto.coverprofile
   - go test -coverprofile=cipher.coverprofile ./cipher

cipher/cipher.go

@@ -25,7 +25,7 @@ func GenerateKey() (publicKey, privateKey string) {
 	return base64.RawURLEncoding.EncodeToString(public[:]), base64.RawURLEncoding.EncodeToString(private[:])
 }
 
-// Box use to encrypts/decrypts message with nacl/box (curve25519&salsa20), it implemented Cipher insterface.
+// Box use to encrypts/decrypts message base on public key infrastructure (nacl/box, curve25519&salsa20), it implemented Cipher insterface.
 type Box struct {
 	sharedEncryptKey *[32]byte
 }

crypto.go

@@ -9,7 +9,7 @@ import (
 )
 
 // Version -
-const Version = "3.0.0"
+const Version = "3.0.1"
 
 // Equal compares two []byte for equality without leaking timing information.
 //

go.mod

@@ -0,0 +1,10 @@
+module github.com/teambition/crypto-go
+
+require (
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/stretchr/testify v1.2.2
+	golang.org/x/crypto v0.0.0-20181127143415-eb0de9b17e85
+)
+
+replace golang.org/x/crypto => github.com/golang/crypto v0.0.0-20181030102418-4d3f4d9ffa16

go.sum

@@ -0,0 +1,10 @@
+github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/golang/crypto v0.0.0-20181030102418-4d3f4d9ffa16 h1:eYYX4kSnlwJkijnThiBqTSx3NiIV1R2K1SkNo7viDi0=
+github.com/golang/crypto v0.0.0-20181030102418-4d3f4d9ffa16/go.mod h1:uZvAcrsnNaCxlh1HorK5dUQHGmEKPh2H/Rl1kehswPo=
+github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
+golang.org/x/crypto v0.0.0-20181127143415-eb0de9b17e85 h1:et7+NAX3lLIk5qUCTA9QelBjGE/NkhzYw/mhnr0s7nI=
+golang.org/x/crypto v0.0.0-20181127143415-eb0de9b17e85/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=