Auth: Add RandomBytes() to generate secure random bytes #98 #782

Signed-off-by: Michael Mayer <michael@photoprism.app>

pkg/rnd/bytes.go

@@ -0,0 +1,13 @@
+package rnd
+
+import "crypto/rand"
+
+// RandomBytes returns cryptographically secure random bytes.
+func RandomBytes(n int) ([]byte, error) {
+	b := make([]byte, n)
+	_, err := rand.Read(b)
+	if err != nil {
+		return nil, err
+	}
+	return b, nil
+}

pkg/rnd/bytes_test.go

@@ -0,0 +1,17 @@
+package rnd
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestRandomBytes(t *testing.T) {
+	for n := 0; n <= 64; n++ {
+		if result, err := RandomBytes(n); err != nil {
+			t.Fatal(err)
+		} else {
+			assert.Len(t, result, n)
+		}
+	}
+}