Add a runtime map of string->func() which when called return

Transforms and BlockCiphers. Registration for all types is done at
startup but is very cheap as just a std::function and a std::map entry
are created, no actual objects are created until needed. This is a
huge improvement over Algorithm_Factory which used T::clone() as the
function and thus kept a prototype object of each type in memory.

Replace existing lookup mechanisms for ciphers, AEADs, and compression
to use the transform lookup. The existing Engine framework remains in
place for BlockCipher, but the engines now just call to the registry
instead of having hardcoded lookups.

s/Transformation/Transform/ with typedefs for compatability.

Remove lib/selftest code (for runtime selftesting): not the right approach.

1 files changed, 5 insertions, 0 deletions

diff --git a/src/lib/compression/comp_util.h b/src/lib/compression/comp_util.h
index 6e1ee1671..963eae642 100644
--- a/src/lib/compression/comp_util.h
+++ b/src/lib/compression/comp_util.h
@@ -9,6 +9,7 @@
 #define BOTAN_COMPRESSION_UTILS_H__
 
 #include <botan/compression.h>
+#include <botan/algo_registry.h>
 #include <memory>
 #include <unordered_map>
 
@@ -84,6 +85,10 @@ class Zlib_Style_Stream : public Compression_Stream
       std::unique_ptr<Compression_Alloc_Info> m_allocs;
    };
 
+#define BOTAN_REGISTER_COMPRESSION(C, D) \
+   BOTAN_REGISTER_T_1LEN(Transform, C, 9) \
+   BOTAN_REGISTER_T_NOARGS(Transform, D)
+
 }
 
 #endif