package main
 
import (
	"crypto/hmac"
	"crypto/md5"
	"crypto/sha1"
	"encoding/hex"
	"fmt"
)
 
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(data string) string {
	sha1 := sha1.New()
	sha1.Write([]byte(data))
	return hex.EncodeToString(sha1.Sum([]byte("")))
}
 
func main() {
	fmt.Println(Md5("hello"))
	fmt.Println(Hmac("key2","hello"))
	fmt.Println(Sha1("hello"))
}