Get the current time in go language, and the simple implementation of MD5, HMAC, SHA1 algorithms

package main

import (
	"crypto/hmac"
	"crypto/md5"
	"crypto/sha1"
	"encoding/hex"
	"fmt"
	"strconv"
	"time"
)

func main() {
	curTime := strconv.FormatInt(time.Now().Unix(), 10)
	fmt.Println(curTime)
	fmt.Println(Md5("hello"))
	fmt.Println(Hmac("key2", "hello"))
	fmt.Println(Sha1("hello", "file_"+curTime))
}

func Md5(data string) string {
	md5 := md5.New()
	md5.Write([]byte(data))
	md5Data := md5.Sum([]byte(""))
	return hex.EncodeToString(md5Data)
}

func Hmac(key, data string) string {
	hmac := hmac.New(md5.New, []byte(key))
	hmac.Write([]byte(data))
	return hex.EncodeToString(hmac.Sum([]byte("")))
}

func Sha1(data1 string, data2 string) string {
	sha1 := sha1.New()
	sha1.Write([]byte(data1))
	sha1.Write([]byte(data2))
	return hex.EncodeToString(sha1.Sum([]byte("")))
}