Comment 3 for bug 910719

Yeah, I agree regarding long format as well as fingerprint.

Here is a suggested fix which allows for case insensitive short format, long format alt full fingerprint; with or without the 0x prefix.

https://bazaar.launchpad.net/~andol/duplicity/signkeyformat/revision/1012#duplicity/commandline.py

No, the regex isn't as elegant as I would have liked, but still better than any alternative I could see.