Add signature support for files and text
For files a detached signature is created and additionally attached. This also generalizes the encryptInspector and uses it as a more generic interface to the message composer context. * src/common.c, src/common.h (get_pretty_attachment_name): Add Parameter to query for the name of a detached signature. * src/dialogs.h: Define ID for sign-48.png * src/engine-assuan.c, src/engine-assuan.h (op_assuan_sign): Add flags parameter to control signature options. * src/engine.c (engine_sign_start): Create detached signatures by default. (engine_sign_opaque_start): New. Creates an opaque signature. * src/engine.h (ENGINE_FLAG_DETACHED): New. * src/gpgoladdin.cpp (GetIDsOfNames, Invoke, GetCustomUI): Add sign Action. * src/sign-48.png: New. * src/Makefile.am (EXTRA_DIST): Add sing-48.png * src/ribbon-callbacks.cpp (copyFileToSink): New. Helper function to copy the contents of a file into a sink. (attachSignature): New. Helper function to add a detached signature of a File to a MailItem. (encryptInspector, do_composer_action): Renamed. Actions and data is now controled by flags. Added sign action. (decryptInspector): Use subject as session title. (attachEncryptedFile): New. Attaches an encrypted file. Optionally also attaches the signature of that file. * src/ribbon-callbacks.h: Update accordingly.
- It is not clear how we will handle text sign. For now you can just dump opaque signed data in the messagecomposer if you want to. Some clients like Kmail handle this gracefully. But we also need support for verify in Outlook.
