Add final attribute to many classes

In some cases this can offer better optimization, via devirtualization.
And it lets the user know the class is not intended for derivation.

Some discussion in GH #402

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/kdf/kdf2/kdf2.h b/src/lib/kdf/kdf2/kdf2.h
index e8a8be1fa..ad62ed301 100644
--- a/src/lib/kdf/kdf2/kdf2.h
+++ b/src/lib/kdf/kdf2/kdf2.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * KDF2, from IEEE 1363
 */
-class BOTAN_DLL KDF2 : public KDF
+class BOTAN_DLL KDF2 final : public KDF
    {
    public:
       std::string name() const override { return "KDF2(" + m_hash->name() + ")"; }