We did a lot of work a few years ago to make the test suite PKI reproducible (see #212). The only remaining binary blob with no clear provenance is t/data/binary-test.file. While I don't for a second suspect that Mike put anything malicious in there, I think it'd be reassuring to be more transparent about the source of the underlying data in a file like this, especially given recent adventures with opaque test data in other open-source projects.

t/data/binary-test.file is only used to test the behaviour of RAND_load_file and various digest functions. In fact there's no reason it has to have binary content at all - we could make it an ASCII text file containing widely-known text, to show we have nothing up our sleeves.