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, 4 insertions, 3 deletions

diff --git a/src/lib/hash/md5/md5.h b/src/lib/hash/md5/md5.h
index b0465c838..bbeffee50 100644
--- a/src/lib/hash/md5/md5.h
+++ b/src/lib/hash/md5/md5.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * MD5
 */
-class BOTAN_DLL MD5 : public MDx_HashFunction
+class BOTAN_DLL MD5 final : public MDx_HashFunction
    {
    public:
       std::string name() const override { return "MD5"; }
@@ -30,13 +30,14 @@ class BOTAN_DLL MD5 : public MDx_HashFunction
       void compress_n(const byte[], size_t blocks) override;
       void copy_out(byte[]) override;
 
+   private:
       /**
-      * The message buffer, exposed for use by subclasses (x86 asm)
+      * The message buffer
       */
       secure_vector<u32bit> m_M;
 
       /**
-      * The digest value, exposed for use by subclasses (x86 asm)
+      * The digest value
       */
       secure_vector<u32bit> m_digest;
    };