Make exceptions easier to translate to error codes

Avoid throwing base Botan::Exception type, as it is difficult to
determine what the error is in that case.

Add Exception::error_code and Exception::error_type which allows
(for error code) more information about the error and (for error type)
allows knowing the error type without requiring a sequence of catches.

See GH #1742

1 files changed, 1 insertions, 1 deletions

diff --git a/src/lib/modes/cbc/cbc.cpp b/src/lib/modes/cbc/cbc.cpp
index aa73eb884..a4af7f0bf 100644
--- a/src/lib/modes/cbc/cbc.cpp
+++ b/src/lib/modes/cbc/cbc.cpp
@@ -136,7 +136,7 @@ void CBC_Encryption::finish(secure_vector<uint8_t>& buffer, size_t offset)
    padding().add_padding(buffer, bytes_in_final_block, BS);
 
    if((buffer.size()-offset) % BS)
-      throw Exception("Did not pad to full block size in " + name());
+      throw Internal_Error("Did not pad to full block size in " + name());
 
    update(buffer, offset);
    }