generate random string with golang

gen_rand_string.go

package auth

import (
	"crypto/hmac"
	"crypto/rand"
	"crypto/sha256"
	"encoding/hex"
	"log"
)

func genHash() string {
	b := make([]byte, 16)
	if _, err := rand.Read(b); err != nil {
		log.Panic(err)
	}
	return hex.EncodeToString(
		hmac.New(sha256.New, b).
			Sum(b),
	)
}