if !compareSignatureV2(v2Auth, expectedAuth) {
		return ErrSignatureDoesNotMatch
	}
	return ErrNone
}

func calculateSignatureV2(stringToSign string, secret string) string {
	hm := hmac.New(sha1.New, []byte(secret))
	hm.Write([]byte(stringToSign))
	return base64.StdEncoding.EncodeToString(hm.Sum(nil))
}

// Return signature-v2 for the presigned request.

  private var nextQueueName = 10000
  private var coordinatorWaiting = false
  private var coordinatorWakeUpAt = 0L

  /**
   * When we need a new thread to run tasks, we call [Backend.execute]. A few microseconds later we
   * expect a newly-started thread to call [Runnable.run]. We shouldn't request new threads until
   * the already-requested ones are in service, otherwise we might create more threads than we need.
   *

  // The thread executing the task publishes itself to the superclass' reference and the thread
  // interrupting sets DONE when it has finished interrupting.
  private static final Runnable DONE = new DoNothingRunnable();
  private static final Runnable PARKED = new DoNothingRunnable();
  // Why 1000?  WHY NOT!
  private static final int MAX_BUSY_WAIT_SPINS = 1000;

  @Override
  public final void run() {
    /*

	if keyID == "" && len(kmsKey) != 0 {
		logger.CriticalIf(context.Background(), errors.New("The key ID must not be empty if a KMS data key is present"))
	}
	if keyID != "" && len(kmsKey) == 0 {
		logger.CriticalIf(context.Background(), errors.New("The KMS data key must not be empty if a key ID is present"))
	}

	if metadata == nil {
		metadata = make(map[string]string, 5)
	}

        if (isRetainPayload()) {
            final byte[] payload = new byte[len];
            System.arraycopy(buffer, start, payload, 0, len);
            setRawPayload(payload);
        }

        if (!verifySignature(buffer, start, len)) {
            throw new SMBProtocolDecodingException("Signature verification failed for " + getClass().getName());
        }

    //                                                                           Singleton
    //                                                                           =========
    private static final RequestHeaderDbm _instance = new RequestHeaderDbm();

    private RequestHeaderDbm() {
    }

    public static RequestHeaderDbm getInstance() {
        return _instance;
    }

		Transport:   transport,
		CloseRespFn: closeRespFn,
	}
	if err = args.Validate(); err != nil {
		return args, err
	}
	return args, nil
}

// New - initializes Authorization Management Plugin.
func New(args Args) *AuthZPlugin {
	if args.URL == nil || args.URL.Scheme == "" && args.AuthToken == "" {
		return nil
	}
	return &AuthZPlugin{
		args:   args,

            case HALF_UP:
              return (x >= 0) ? roundCeilingAsDouble : roundFloorAsDouble;
            default:
              throw new AssertionError("impossible");
          }
        }
    }
    throw new AssertionError("impossible");
  }

  /**
   * Returns the closest representable {@code long} to the absolute value of {@code x}.
   *

        DomUtils.insertContentElement(customParent, "newChild", "new value");

        String xmlOutput = DomUtils.toXml(doc);

        // Should be appended at the end since no ordering is defined for customParent
        assertTrue(xmlOutput.contains("<newChild>new value</newChild>"), "Should contain new child element");

        int existingChildIndex = xmlOutput.indexOf("<existingChild>");

import org.junit.Test;

/**
 * @author koichik
 *
 */
public class SingleValueIteratorTest {

    /**
     *
     */
    @Test
    public void test() {
        final SingleValueIterator<String> it = new SingleValueIterator<String>("Foo");
        assertThat(it.hasNext(), is(true));
        assertThat(it.next(), is("Foo"));
        assertThat(it.hasNext(), is(not(true)));
    }