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.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/lib/hash/hash.h b/src/lib/hash/hash.h
index ac1c22a65..0f35685d4 100644
--- a/src/lib/hash/hash.h
+++ b/src/lib/hash/hash.h
@@ -40,6 +40,13 @@ class BOTAN_DLL HashFunction : public Buffered_Computation
       */
       virtual HashFunction* clone() const = 0;
 
+      /**
+      * @return provider information about this implementation. Default is "base",
+      * might also return "sse2", "avx2", "openssl", or some other arbitrary string.
+      * The return value is guaranteed to point to a string literal constant.
+      */
+      virtual const char* provider() const { return "base"; }
+
       HashFunction();
 
       virtual ~HashFunction();