tweet_fake.go

package main

import (
	"crypto/hmac"
	"crypto/sha256"
	"encoding/hex"
	"fmt"
)

func main() {
	handle := "@someone"
	secret := "secret" // belonging to handle
	tweet := "tweeted a cat"

	h := hmac.New(sha256.New, []byte(secret))
	h.Write([]byte(tweet))
	sign := hex.EncodeToString(h.Sum(nil))

	sep := "---------------------------------------"
	fmt.Printf("%s\n%s \n%s \n{sign=%s}\n%s\n", sep, handle, tweet, sign[0:10], sep)
}