add rethrow option

test/encryption.js

@@ -22,6 +22,13 @@ test ('fail decryption', (t) => {
   t.is (dec, null);
 });
 
+test ('rethrow decryption', (t) => {
+  const enc = crypto.encrypt_aes ('foo', 'bar');
+  t.throws (() => {
+    const dec = crypto.decrypt_aes (enc, 'baz', true);
+  });
+});
+
 test ('unique crypto strings', (t) => {
   const enc = [
     crypto.encrypt_aes ('foo', 'bar'),