package main
import (
    "crypto/sha256"
    "fmt"
)
func main() {
    str := "nilpointer"
    data := []byte(str)
    hash := sha256.Sum256(data)
    fmt.Printf("%x", hash[:])
}
    
Output
6e0b3b41da495276c95bd32985b6dd5b870d50b965d6b4df50f810fb6eb1def8