On Mon, Jan 04, 2021 at 10:45:57PM +0100, Stephan Müller wrote:

The HKDF addition is used to replace the implementation in the filesystem
crypto extension. This code was tested by using an EXT4 encrypted file
system that was created and contains files written to by the current
implementation. Using the new implementation a successful read of the
existing files was possible and new files / directories were created
and read successfully. These newly added file system objects could be
successfully read using the current code. Yet if there is a test suite
to validate whether the invokcation of the HKDF calculates the same
result as the existing implementation, I would be happy to validate
the implementation accordingly.

See https://www.kernel.org/doc/html/latest/filesystems/fscrypt.html#tests
for how to run the fscrypt tests.  'kvm-xfstests -c ext4 generic/582' should be
enough for this, though you could run all the tests if you want.

- Eric