The md5 checksum for the /net-libs/openhbci-plugin-ddvcard is NOT valid. This happens probably on all mirrorservers (tested 2). The DEFAULT one (the one you get if you enter nothing as mirror in the make.conf) and uni-erlangen.de Due this error, the ebuild fails of course. (good thing) Please check if this is a really corrupt package or just a wrong md5file.
Sorry, my fault. I had this fix for ages in my own cvs-tree and forgot to commit it. Now it should be fixed.