Expose CMAC::poly_double as a static function since it looks like I may

want to inline the CMAC computation in EAX mode.

Also optimize CMAC::final_result slightly. Only write to state directly,
instead of also the write buffer (this should help L1 data caching), and
avoid what was basically a no-op where we zeroized part of a buffer and
then xored it against another buffer.

1 files changed, 4 insertions, 0 deletions

diff --git a/include/cmac.h b/include/cmac.h
index de3f8b87a..c7f107258 100644
--- a/include/cmac.h
+++ b/include/cmac.h
@@ -19,6 +19,10 @@ class BOTAN_DLL CMAC : public MessageAuthenticationCode
       void clear() throw();
       std::string name() const;
       MessageAuthenticationCode* clone() const;
+
+      static SecureVector<byte> poly_double(const MemoryRegion<byte>& in,
+                                            byte polynomial);
+
       CMAC(const std::string&);
       ~CMAC() { delete e; }
    private: