1 files changed, 13 insertions, 0 deletions
diff --git a/src/lib/pk_pad/emsa.cpp b/src/lib/pk_pad/emsa.cpp
index 0501bc5f4..4d4b96ad1 100644
--- a/src/lib/pk_pad/emsa.cpp
+++ b/src/lib/pk_pad/emsa.cpp
@@ -41,6 +41,19 @@ EMSA* get_emsa(const std::string& algo_spec)
    throw Algorithm_Not_Found(algo_spec);
    }
 
+std::string hash_for_emsa(const std::string& algo_spec)
+   {
+   SCAN_Name emsa_name(algo_spec);
+
+   if(emsa_name.arg_count() > 0)
+      {
+      const std::string pos_hash = emsa_name.arg(0);
+      return pos_hash;
+      }
+
+   return "SHA-512"; // safe default if nothing we understand
+   }
+
 #define BOTAN_REGISTER_EMSA_NAMED_NOARGS(type, name) \
    BOTAN_REGISTER_NAMED_T(EMSA, name, type, make_new_T<type>)