typo md4 to md5

checksum.go

@@ -34,7 +34,7 @@ func isLeanworkFormValid(form url.Values) bool {
 	return r == sign
 }
 
-func md4RpnFormP2P(r RpnReq) string {
+func md5RpnFormP2P(r RpnReq) string {
 	return md5RpnForm(r, Config.Rpn.MD5P2P)
 }