Add T::provider() to allow user to inquire about implementation used

For block ciphers, stream ciphers, hashes, MACs, and cipher modes.
Cipher_Mode already had it, with a slightly different usage.

2 files changed, 13 insertions, 0 deletions

diff --git a/src/lib/block/serpent/serpent.cpp b/src/lib/block/serpent/serpent.cpp
index 1e3699914..f2a6035f1 100644
--- a/src/lib/block/serpent/serpent.cpp
+++ b/src/lib/block/serpent/serpent.cpp
@@ -231,4 +231,16 @@ void Serpent::clear()
    zap(m_round_key);
    }
 
+const char* Serpent::provider() const
+   {
+#if defined(BOTAN_HAS_SERPENT_SIMD)
+   if(CPUID::has_simd_32())
+      {
+      return "simd";
+      }
+#endif
+
+   return "base";
+   }
+
 }
diff --git a/src/lib/block/serpent/serpent.h b/src/lib/block/serpent/serpent.h
index 8f854678a..72c26d452 100644
--- a/src/lib/block/serpent/serpent.h
+++ b/src/lib/block/serpent/serpent.h
@@ -23,6 +23,7 @@ class BOTAN_DLL Serpent final : public Block_Cipher_Fixed_Params<16, 16, 32, 8>
       void decrypt_n(const byte in[], byte out[], size_t blocks) const override;
 
       void clear() override;
+      const char* provider() const override;
       std::string name() const override { return "Serpent"; }
       BlockCipher* clone() const override { return new Serpent; }