encoding/hex
package main
import (
"encoding/hex"
"fmt"
)
func main() {
msg := []byte("Hello 世界")
encoded := hex.EncodeToString(msg)
fmt.Println(encoded)
// 48656c6c6f20e4b896e7958c
decoded, _ := hex.DecodeString(encoded)
fmt.Println(string(decoded))
// Hello 世界
}