For the last few weeks, I had problems with gpg signing, and thought
it was due to a temporary bug as everybody will face it.

Well, it still happens, so here is my lament :)

My messages weren't anymore classified as well signed in Gnus, so
after some investigations, it seems that the adding of `\r' at the end
of lines when verifying key broke something, and I had to add the
following to sign the message in the right way :