Add checks that keyed algorithms are actually keyed before use

Previously calling update or encrypt without calling set_key first
would result in invalid outputs or else crashing.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/lib/base/sym_algo.h b/src/lib/base/sym_algo.h
index a596f5932..a0ebac626 100644
--- a/src/lib/base/sym_algo.h
+++ b/src/lib/base/sym_algo.h
@@ -91,6 +91,13 @@ class BOTAN_PUBLIC_API(2,0) SymmetricAlgorithm
       */
       virtual std::string name() const = 0;
 
+   protected:
+      void verify_key_set(bool cond) const
+         {
+         if(cond == false)
+            throw Key_Not_Set(name());
+         }
+
    private:
       /**
       * Run the key schedule