req.URL.RawQuery = query.Encode()

	// Save signature finally.
	req.URL.RawQuery += "&Signature=" + url.QueryEscape(signature)
	return nil
}

// Sign given request using Signature V2.
func signRequestV2(req *http.Request, accessKey, secretKey string) error {
	signer.SignV2(*req, accessKey, secretKey, false)
	return nil
}

// Sign given request using Signature V4.

}

// signatureErr is a signature returned when an error occurs.
var signatureErr = [4]byte{'e', 'r', 'r', 0}

// getSignature will return a signature that is expected to be the same across all disks.
func (j xlMetaV2Version) getSignature() [4]byte {
	switch j.Type {
	case ObjectType:
		return j.ObjectV2.Signature()
	case DeleteType:
		return j.DeleteMarker.Signature()
	case LegacyType:

		return
	}
	z.ModTime, err = dc.ReadInt64()
	if err != nil {
		err = msgp.WrapError(err, "ModTime")
		return
	}
	err = dc.ReadExactBytes((z.Signature)[:])
	if err != nil {
		err = msgp.WrapError(err, "Signature")
		return
	}
	{
		var zb0002 uint8
		zb0002, err = dc.ReadUint8()
		if err != nil {
			err = msgp.WrapError(err, "Type")
			return
		}

                        // verify the server signature here, this is not done automatically as we don't set the
                        // request digest
                        // Ignore a missing signature for SMB < 3.0, as
                        // - the specification does not clearly require that (it does for SMB3+)

			return
		}
	}

	// Verify policy signature.
	cred, errCode := doesPolicySignatureMatch(formValues)
	if errCode != ErrNone {
		writeErrorResponse(ctx, w, errorCodes.ToAPIErr(errCode), r.URL)
		return
	}

	if len(fanOutEntries) > 0 {
		// Once signature is validated, check if the user has
		// explicit permissions for the user.

		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingSignTag: {
		Code:           "AccessDenied",
		Description:    "Signature header missing Signature field.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMissingSignHeadersTag: {
		Code:           "InvalidArgument",
		Description:    "Signature header missing SignedHeaders field.",
		HTTPStatusCode: http.StatusBadRequest,
	},
	ErrMalformedExpires: {

     * type. So why even make that error possible by giving callers the choice?
     *
     * On the other hand, the current signature is consistent with the similar allAsList method. And
     * eventually this method may go away entirely in favor of an API like
     * whenAllComplete().collectSuccesses(). That API would have a signature more like the current
     * one.
     */
    return new ListFuture<V>(ImmutableList.copyOf(futures), false);
  }

        final boolean serverRequireSig = resp.getResponse().isSigningRequired();
        final boolean serverEnableSig = resp.getResponse().isSigningEnabled();
        if (log.isDebugEnabled()) {
            log.debug("Signature negotiation enforced " + this.signingEnforced + " (server " + serverRequireSig + ") enabled "
                    + this.getContext().getConfig().isSigningEnabled() + " (server " + serverEnableSig + ")");
        }

     *     .build();
     * ```
     *
     * ## TrustManagers on Android are Weird!
     *
     * Trust managers targeting Android must also define a method that has this signature:
     *
     * ```java
     *    @SuppressWarnings("unused")
     *    public List<X509Certificate> checkServerTrusted(
     *        X509Certificate[] chain, String authType, String host) throws CertificateException {

   * usually be handled more naturally using {@code tryFind(iterator, predicate).or(defaultValue)}.
   *
   * @since 7.0
   */
  // For discussion of this signature, see the corresponding overload of *Iterables*.find.
  public static <T extends @Nullable Object> @Nullable T find(
      Iterator<? extends T> iterator, Predicate<? super T> predicate, @Nullable T defaultValue) {