Golang Blake2b hash example

crypto.go

package crypto

import (
	"golang.org/x/crypto/blake2b"
)

// NewBlake2b256 ...
func NewBlake2b256(data []byte) []byte {
	hash := blake2b.Sum256(data)
	return hash[:]
}

// NewBlake2b512 ...
func NewBlake2b512(data []byte) []byte {
	hash := blake2b.Sum512(data)
	return hash[:]
}

crypto_test.go

package crypto

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

func TestNewBlake2b256(t *testing.T) {
	for i, tt := range []struct {
		in  []byte
		out string
	}{
		{[]byte(""), "0e5751c026e543b2e8ab2eb06099daa1d1e5df47778f7787faab45cdf12fe3a8"},
		{[]byte("abc"), "bddd813c634239723171ef3fee98579b94964e3bb1cb3e427262c8c068d52319"},
		{[]byte("hello"), "324dcf027dd4a30a932c441f365a25e86b173defa4b8e58948253471b81b72cf"},
	} {
		t.Run(fmt.Sprintf("%v", i), func(t *testing.T) {
			result := NewBlake2b256(tt.in)
			if hex.EncodeToString(result) != tt.out {
				t.Errorf("want %v; got %v", tt.out, hex.EncodeToString(result))
			}
		})
	}
}

func TestNewBlake2b512(t *testing.T) {
	for i, tt := range []struct {
		in  []byte
		out string
	}{
		{[]byte(""), "786a02f742015903c6c6fd852552d272912f4740e15847618a86e217f71f5419d25e1031afee585313896444934eb04b903a685b1448b755d56f701afe9be2ce"},
		{[]byte("abc"), "ba80a53f981c4d0d6a2797b69f12f6e94c212f14685ac4b74b12bb6fdbffa2d17d87c5392aab792dc252d5de4533cc9518d38aa8dbf1925ab92386edd4009923"},
		{[]byte("hello"), "e4cfa39a3d37be31c59609e807970799caa68a19bfaa15135f165085e01d41a65ba1e1b146aeb6bd0092b49eac214c103ccfa3a365954bbbe52f74a2b3620c94"},
	} {
		t.Run(fmt.Sprintf("%v", i), func(t *testing.T) {
			result := NewBlake2b512(tt.in)
			if hex.EncodeToString(result) != tt.out {
				t.Errorf("want %v; got %v", tt.out, hex.EncodeToString(result))
			}
		})
	}
}

Thanks. I am using this in production (Base64 makes it more compact for string storage).

func Blake384(data string) string {
    h := blake2b.Sum384([]byte(data))
    return base64.URLEncoding.EncodeToString(h[:])
}

Example (ignore the prefixes)

Redis Cache miss: data:K_gOYzuQhfd9jhmMYmmG3m5tV2QUfK_Y-TSiAdn3L-3wlkIyMsrfCsJWfjXQiIPM
Redis Cache miss: data:ia8NXWVbT5wAI3_9zxP6LujOHZFAQlxJy_zdKZlVMWVQ_HmYe9Lcs2HhzK-LixCJ