Golang SHA256 hash example

crypto.go

package crypto

import (
	"crypto/sha256"
)

// NewSHA256 ...
func NewSHA256(data []byte) []byte {
	hash := sha256.Sum256(data)
	return hash[:]
}

crypto_test.go

package crypto

import (
	"encoding/hex"
	"fmt"
	"testing"
)

func TestNewSHA256(t *testing.T) {
	for i, tt := range []struct {
		in  []byte
		out string
	}{
		{[]byte(""), "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855"},
		{[]byte("abc"), "ba7816bf8f01cfea414140de5dae2223b00361a396177a9cb410ff61f20015ad"},
		{[]byte("hello"), "2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824"},
	} {
		t.Run(fmt.Sprintf("%v", i), func(t *testing.T) {
			result := NewSHA256(tt.in)
			if hex.EncodeToString(result) != tt.out {
				t.Errorf("want %v; got %v", tt.out, hex.EncodeToString(result))
			}
		})
	}
}

main.go

package main

import (
	"crypto/sha256"
	"fmt"
)

func main() {
	data := []byte("hello")
	hash := sha256.Sum256(data)
	fmt.Printf("%x", hash[:]) // 2cf24dba5fb0a30e26e83b2ac5b9e29e1b161e5c1fa7425e73043362938b9824
}