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+# Go FIDO U2F Library
+
+This Go package implements the parts of the FIDO U2F specification required on
+the server side of an application.
+
+[![Build Status](https://travis-ci.org/tstranex/u2f.svg?branch=master)](https://travis-ci.org/tstranex/u2f)
+
+## Features
+
+- Native Go implementation
+- No dependancies other than the Go standard library
+- Token attestation certificate verification
+
+## Usage
+
+Please visit http://godoc.org/github.com/tstranex/u2f for the full
+documentation.
+
+### How to enrol a new token
+
+```go
+app_id := "http://localhost"
+
+// Send registration request to the browser.
+c, _ := NewChallenge(app_id, []string{app_id})
+req, _ := c.RegisterRequest()
+
+// Read response from the browser.
+var resp RegisterResponse
+reg, err := Register(resp, c, nil)
+if err != nil {
+    // Registration failed.
+}
+
+// Store registration in the database.
+```
+
+### How to perform an authentication
+
+```go
+// Fetch registration and counter from the database.
+var reg Registration
+var counter uint32
+
+// Send authentication request to the browser.
+c, _ := NewChallenge(app_id, []string{app_id})
+req, _ := c.SignRequest(reg)
+
+// Read response from the browser.
+var resp SignResponse
+newCounter, err := reg.Authenticate(resp, c, counter)
+if err != nil {
+    // Authentication failed.
+}
+
+// Store updated counter in the database.
+```
+
+## Installation
+
+```
+$ go get github.com/tstranex/u2f
+```
+
+## Example
+
+See u2fdemo/main.go for an full example server. To run it:
+
+```
+$ go install github.com/tstranex/u2f/u2fdemo
+$ ./bin/u2fdemo
+```
+
+Open https://localhost:3483 in Chrome.
+Ignore the SSL warning (due to the self-signed certificate for localhost).
+You can then test registering and authenticating using your token.
+
+## Changelog
+
+- 2016-12-18: The package has been updated to work with the new
+  U2F Javascript 1.1 API specification. This causes some breaking changes.
+
+  `SignRequest` has been replaced by `WebSignRequest` which now includes
+  multiple registrations. This is useful when the user has multiple devices
+  registered since you can now authenticate against any of them with a single
+  request.
+
+  `WebRegisterRequest` has been introduced, which should generally be used
+  instead of using `RegisterRequest` directly. It includes the list of existing
+  registrations with the new registration request. If the user's device already
+  matches one of the existing registrations, it will refuse to re-register.
+
+  `Challenge.RegisterRequest` has been replaced by `NewWebRegisterRequest`.
+
+## License
+
+The Go FIDO U2F Library is licensed under the MIT License.