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

5 files changed, 6 insertions, 6 deletions

diff --git a/src/lib/kdf/hkdf/hkdf.h b/src/lib/kdf/hkdf/hkdf.h
index d8389a886..d4e4006ca 100644
--- a/src/lib/kdf/hkdf/hkdf.h
+++ b/src/lib/kdf/hkdf/hkdf.h
@@ -18,7 +18,7 @@ namespace Botan {
 * HKDF, see @rfc 5869 for details
 * This is only the expansion portion of HKDF
 */
-class BOTAN_DLL HKDF : public KDF
+class BOTAN_DLL HKDF final : public KDF
    {
    public:
       HKDF(MessageAuthenticationCode* prf) : m_prf(prf) {}
diff --git a/src/lib/kdf/kdf1/kdf1.h b/src/lib/kdf/kdf1/kdf1.h
index a22d19d97..2697685ac 100644
--- a/src/lib/kdf/kdf1/kdf1.h
+++ b/src/lib/kdf/kdf1/kdf1.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * KDF1, from IEEE 1363
 */
-class BOTAN_DLL KDF1 : public KDF
+class BOTAN_DLL KDF1 final : public KDF
    {
    public:
       std::string name() const override { return "KDF1(" + m_hash->name() + ")"; }
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() + ")"; }
diff --git a/src/lib/kdf/prf_tls/prf_tls.h b/src/lib/kdf/prf_tls/prf_tls.h
index bb7cc2c4f..f000484a7 100644
--- a/src/lib/kdf/prf_tls/prf_tls.h
+++ b/src/lib/kdf/prf_tls/prf_tls.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * PRF used in TLS 1.0/1.1
 */
-class BOTAN_DLL TLS_PRF : public KDF
+class BOTAN_DLL TLS_PRF final : public KDF
    {
    public:
       std::string name() const override { return "TLS-PRF"; }
@@ -36,7 +36,7 @@ class BOTAN_DLL TLS_PRF : public KDF
 /**
 * PRF used in TLS 1.2
 */
-class BOTAN_DLL TLS_12_PRF : public KDF
+class BOTAN_DLL TLS_12_PRF final : public KDF
    {
    public:
       std::string name() const override { return "TLS-12-PRF(" + m_mac->name() + ")"; }
diff --git a/src/lib/kdf/prf_x942/prf_x942.h b/src/lib/kdf/prf_x942/prf_x942.h
index d0b23067c..f31036649 100644
--- a/src/lib/kdf/prf_x942/prf_x942.h
+++ b/src/lib/kdf/prf_x942/prf_x942.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * PRF from ANSI X9.42
 */
-class BOTAN_DLL X942_PRF : public KDF
+class BOTAN_DLL X942_PRF final : public KDF
    {
    public:
       std::string name() const override { return "X942_PRF(" + m_key_wrap_oid + ")"; }