diff --git a/wormhole/send.go b/wormhole/send.go
index 2e2d1c5..39890da 100644
--- a/wormhole/send.go
+++ b/wormhole/send.go
@@ -175,7 +175,7 @@ func (c *Client) SendText(ctx context.Context, msg string, opts ...SendOption) (
 			close(ch)
 			return
 		} else {
-			sendErr(fmt.Errorf("unexpected answer"))
+			sendErr(errors.New("unexpected answer"))
 			return
 		}
 	}()
@@ -423,7 +423,7 @@ func (c *Client) sendFileDirectory(ctx context.Context, offer *offerMsg, r io.Re
 		}
 
 		shaSum := hex.EncodeToString(hasher.Sum(nil))
-		if strings.ToLower(ack.SHA256) != shaSum {
+		if strings.EqualFold(ack.SHA256, shaSum) {
 			sendErr(fmt.Errorf("receiver sha256 mismatch %s vs %s", ack.SHA256, shaSum))
 			return
 		}