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Hi all,
please note that to stay compatible with the GNU md5sum utility you should print the file name prefixed by a "*" if you read the file in binary mode.
Also when digests is checked, files to check should be opened in binary or text mode according the presence/absence of the "*" character before the file name.
A explicit error should be raised IMO if some specific mode is not supported (e.g. text mode) by the check function.
Also, since the tool supports different hashing algorithms the openssl/BSD-style output format could be more appropriate IMO:
MD5 (file01.dat) = 101b455ce70d2e73e1a4d92a3e8c29e1
FYI I wrote a the hashsum package [1] that provides a command line tool that is intended to be a "Python drop-in replacement for md5sum and co.".
If my understanding is correct you want to keep this patch as simple as possible but, if you are interested in, I could provide patches to:
* fix the GNU style output: binary ("*") vs text mode
* implement full support for the text mode
* implement full support for BSD-style output format
I could also convert the hassum.py utility [1] to be integrated directly in hashlib.
[1] https://github.com/avalentino/hashsum