feat: initial commit

internal/crypto/rand.go

@@ -0,0 +1,22 @@
+package crypto
+
+import (
+	"crypto/rand"
+
+	"github.com/pkg/errors"
+)
+
+func RandomBytes(size int) ([]byte, error) {
+	data := make([]byte, size)
+
+	read, err := rand.Read(data)
+	if err != nil {
+		return nil, errors.WithStack(err)
+	}
+
+	if read != size {
+		return nil, errors.New("unexpected number of read bytes")
+	}
+
+	return data, nil
+}