Reroot the exception hierarchy into a toplevel Exception class

As the alternatives are unfortunate for applications trying to catch
all library errors, and it seems deriving from std::runtime_error
causes problems with MSVC DLLs (GH #340)

Effectively reverts 2837e915d82e43

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/mac/cmac/cmac.cpp b/src/lib/mac/cmac/cmac.cpp
index 27edda233..1501bc316 100644
--- a/src/lib/mac/cmac/cmac.cpp
+++ b/src/lib/mac/cmac/cmac.cpp
@@ -55,7 +55,7 @@ secure_vector<byte> CMAC::poly_double(const secure_vector<byte>& in)
             out[out.size()-1] ^= 0x25;
             break;
          default:
-            throw std::runtime_error("Unsupported CMAC size " + std::to_string(in.size()));
+            throw Exception("Unsupported CMAC size " + std::to_string(in.size()));
          }
       }