[bugfix] check for an empty hashKey (#52)

this scenario might occur when converting from an empty string to
byte slice, such as when reading from a configuration file.

1 files changed, 1 insertions, 1 deletions

diff --git a/securecookie.go b/securecookie.go
index cd4e097..61af390 100644
--- a/securecookie.go
+++ b/securecookie.go
@@ -141,7 +141,7 @@ func New(hashKey, blockKey []byte) *SecureCookie {
 		maxLength: 4096,
 		sz:        GobEncoder{},
 	}
-	if hashKey == nil {
+	if len(hashKey) == 0 {
 		s.err = errHashKeyNotSet
 	}
 	if blockKey != nil {