It's dangerous to go-alone! Take this.

go-alone is a Go package that provides

Methods to create and verify MAC signatures of data
Ability to add timestamps to signed tokens and use custom epoch if needed.
BLAKE2b signatures and Base58 time encoding provides outstanding performance and security.
A very simple to use API with good documentation and 100% test coverage.
Various helper methods for parsing tokens

For more information, please read the wiki

For help with this package or general Go discussion, please join the Discord Gophers chat server.

For a fast and easy to use snowflake ID library, check out this

Getting Started

This assumes you already have a working Go environment, if not please see this page first.

Installing

go get github.com/bwmarrin/go-alone

Usage

Here's a basic example below. There is also an example program in the example folder that demonstrates a few more ways of using Go-Alone. You can read the API documentation on GoDoc.

package main

import (
	"github.com/bwmarrin/go-alone"
)

func main() {

	// This secret is used as the hash key for the signer.
	var secret = []byte("It's a secret to everybody")

	// This data is what we will be signing below.
	var data = []byte("It's dangerous to go alone! Take this.")

	// Create a new Signer using our secret
	s := goalone.New(secret)

	// Sign and return a token in the form of `data.signature`
	token := s.Sign(data)

	// Unsign the token to verify it - if successful the data portion of the
	// token is returned.  If unsuccessful then d will be nil, and an error
	// is returned.
	d, err := s.Unsign(token)
	if err != nil {
		// signature is not valid. Token was tampered with, forged, or maybe it's
		// not even a token at all! Either way, it's not safe to use it.
	} else {
		// signature is valid, it is safe to use the data
		println(string(d))
	}
}