package main

import (
	"fmt"

	"golang.org/x/crypto/blake2b"
)

func GenerateToken(pkey []byte, id int, a... []byte) ([]byte, error) {
	h, err := blake2b.New(blake2b.Size, nil)
	if err != nil {
		return nil, err
	}

	h.Write(pkey)
	h.Write([]byte(fmt.Sprintf(":%d", id)))

	for _, v := range a {
		h.Write([]byte(":"))
		h.Write(v)
	}

	return h.Sum(nil), nil
}