Reported by elfring on GitHub.
I suggest to add the key word "const" to the type specifiers for parameters like the following.
key_string (function "BlowfishSetKey") src/Crypto/Blowfish.h#L18
name (function "ReadLocalMachineRegistryString") src/Common/Registry.h#L15
xmlNode (function "XmlNextNode") src/Common/Xml.h#L13
Would you like to apply the advices from an article to more places in your source files?