Add a function to query algorithm providers

2 files changed, 27 insertions, 0 deletions

diff --git a/src/algo_factory/algo_factory.cpp b/src/algo_factory/algo_factory.cpp
index cdef6351f..2f7921ce0 100644
--- a/src/algo_factory/algo_factory.cpp
+++ b/src/algo_factory/algo_factory.cpp
@@ -45,6 +45,31 @@ Engine* Algorithm_Factory::get_engine_n(u32bit n) const
    }
 
 /**
+* Return the possible providers of a request
+*/
+std::vector<std::string>
+Algorithm_Factory::providers_of(const SCAN_Name& request)
+   {
+   std::vector<std::string> providers;
+   for(u32bit i = 0; i != engines.size(); ++i)
+      {
+      std::string provider = engines[i]->provider_name();
+      if(request.provider_allowed(provider))
+         {
+         if(engines[i]->prototype_block_cipher(request, *this) ||
+            engines[i]->prototype_stream_cipher(request, *this) ||
+            engines[i]->prototype_hash_function(request, *this) ||
+            engines[i]->prototype_mac(request, *this))
+            {
+            providers.push_back(provider);
+            }
+         }
+      }
+
+   return providers;
+   }
+
+/**
 * Return the prototypical object cooresponding to this request
 */
 const BlockCipher*
diff --git a/src/algo_factory/algo_factory.h b/src/algo_factory/algo_factory.h
index 2513c42c9..fb41b4882 100644
--- a/src/algo_factory/algo_factory.h
+++ b/src/algo_factory/algo_factory.h
@@ -39,6 +39,8 @@ class BOTAN_DLL Algorithm_Factory
          };
       friend class Engine_Iterator;
 
+      std::vector<std::string> providers_of(const SCAN_Name& request);
+
       // Block cipher operations
       const BlockCipher* prototype_block_cipher(const SCAN_Name& request);
       BlockCipher* make_block_cipher(const SCAN_Name& request);