Makes things a little bit more like similar APIs.
* Hash type is now set in constructor.
* MGF is set automtically or manually with `set_mgf()`
* Label defaults to empty
Some bad assumptions were made during the creation of our Python AES GCM
code. This is now modified to be more in-line with other libraries. This
is an API breaking change on unreleased code.
This now allows for aad data to be used, varying length of
authentication tags and fixes a bug for multipart.
1. Now unified to a single class AesGcmStream()
2. Used `encrypt()` and `decrypt()` instead of `update()` to avoid
confusion over encryption and aad semantics
3. final tag_bytes is configurable in the constructor
4. `set_aad()` added to add the aad data
5. aad data is cleared after first `encrypt()` or `decrypt()` call due
to quirk in the C API.
6. More tests added
Windows had an issue where it was trying to build the CFFI module after
it had already imported the CFFI module. Which caused permissions
errors during builds.
This fix does several things to make the Windows build work properly and
improve the Linux build too:
* The CFFI module is only build when needed, not as part of an sdist
package
* Version numbering spilt out into separate file so __init__.py import
is not required
* Merged _build_ffi.py and _build_wolfssl.py into one file
* Made CFFI only build when called as an executable (which happens
during binary build time)
* Make tox use bdist-wheel instead of sdist
* Fix some path and compiler things for Windows
* Move source code to align better with Python standards
* Have setup.py build wolfSSL and FFI
* Update Python versions in tox
* Add CMake building for Windows build
* Add missing __init__.py for tox
* Make wolfSSL a git submodule
Andrew Hutchings
Hayden Roche
Daniele Lacamera
Moisés Guimarães