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, 5 insertions, 5 deletions

diff --git a/src/lib/stream/chacha/chacha.h b/src/lib/stream/chacha/chacha.h
index df6e1c9c0..92f8ef035 100644
--- a/src/lib/stream/chacha/chacha.h
+++ b/src/lib/stream/chacha/chacha.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * DJB's ChaCha (http://cr.yp.to/chacha.html)
 */
-class BOTAN_DLL ChaCha : public StreamCipher
+class BOTAN_DLL ChaCha final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/ctr/ctr.h b/src/lib/stream/ctr/ctr.h
index f59f06d5f..dc05fa596 100644
--- a/src/lib/stream/ctr/ctr.h
+++ b/src/lib/stream/ctr/ctr.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * CTR-BE (Counter mode, big-endian)
 */
-class BOTAN_DLL CTR_BE : public StreamCipher
+class BOTAN_DLL CTR_BE final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/ofb/ofb.h b/src/lib/stream/ofb/ofb.h
index 32dc199bc..4775c5575 100644
--- a/src/lib/stream/ofb/ofb.h
+++ b/src/lib/stream/ofb/ofb.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * Output Feedback Mode
 */
-class BOTAN_DLL OFB : public StreamCipher
+class BOTAN_DLL OFB final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/rc4/rc4.h b/src/lib/stream/rc4/rc4.h
index c8c81d1a2..db1726a18 100644
--- a/src/lib/stream/rc4/rc4.h
+++ b/src/lib/stream/rc4/rc4.h
@@ -16,7 +16,7 @@ namespace Botan {
 /**
 * RC4 stream cipher
 */
-class BOTAN_DLL RC4 : public StreamCipher
+class BOTAN_DLL RC4 final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;
diff --git a/src/lib/stream/salsa20/salsa20.h b/src/lib/stream/salsa20/salsa20.h
index a5e7a1f14..7e75470da 100644
--- a/src/lib/stream/salsa20/salsa20.h
+++ b/src/lib/stream/salsa20/salsa20.h
@@ -15,7 +15,7 @@ namespace Botan {
 /**
 * DJB's Salsa20 (and XSalsa20)
 */
-class BOTAN_DLL Salsa20 : public StreamCipher
+class BOTAN_DLL Salsa20 final : public StreamCipher
    {
    public:
       void cipher(const byte in[], byte out[], size_t length) override;