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/pbkdf/pbkdf2/pbkdf2.cpp b/src/lib/pbkdf/pbkdf2/pbkdf2.cpp
index 6fc007bf3..9d0be3a58 100644
--- a/src/lib/pbkdf/pbkdf2/pbkdf2.cpp
+++ b/src/lib/pbkdf/pbkdf2/pbkdf2.cpp
@@ -25,7 +25,7 @@ void pbkdf2_set_key(MessageAuthenticationCode& prf,
       }
    catch(Invalid_Key_Length&)
       {
-      throw Exception("PBKDF2 cannot accept passphrase of the given size");
+      throw Invalid_Argument("PBKDF2 cannot accept passphrase of the given size");
       }
    }