1 files changed, 19 insertions, 2 deletions
diff --git a/src/lib/hash/hash.h b/src/lib/hash/hash.h
index 9b2ca0d3b..ac1c22a65 100644
--- a/src/lib/hash/hash.h
+++ b/src/lib/hash/hash.h
@@ -20,11 +20,30 @@ namespace Botan {
 class BOTAN_DLL HashFunction : public Buffered_Computation
    {
    public:
+      typedef SCAN_Name Spec;
+
+      /**
+      * Create an instance based on a name
+      * Will return a null pointer if the algo/provider combination cannot
+      * be found. If provider is empty then best available is chosen.
+      */
+      static std::unique_ptr<HashFunction> create(const std::string& algo_spec,
+                                                  const std::string& provider = "");
+
+      /**
+      * Returns the list of available providers for this algorithm, empty if not available
+      */
+      static std::vector<std::string> providers(const std::string& algo_spec);
+
       /**
       * @return new object representing the same algorithm as *this
       */
       virtual HashFunction* clone() const = 0;
 
+      HashFunction();
+
+      virtual ~HashFunction();
+
       virtual void clear() = 0;
 
       virtual std::string name() const = 0;
@@ -33,8 +52,6 @@ class BOTAN_DLL HashFunction : public Buffered_Computation
       * @return hash block size as defined for this algorithm
       */
       virtual size_t hash_block_size() const { return 0; }
-
-      typedef SCAN_Name Spec;
    };
 
 }