uru4000: search for encryption byte
uru4000: search for encryption byte

New DigitalPersona devices have a new firmware. We now use a search
scheme to find the encryption byte, by examining known locations
in the firmware until we find something that we recognise.

anarsoul/libfprint,dsd/libfprint,abhishekgahlot/libfprint,ccsystems/libfprint,sbambrough/libfprint_extended,kunalg/libfprint,zemen/libfprint,bhdn/libfprint-vkapi,PDXostc/libfprint,FabriceSalvaire/libfprint-baspi,abhishekgahlot/fprint-bsapi,hyperair/fprint-bsapi,bhdn/libfprint-vkapi,rmarku/libfprint,bhdn/libfprint-vkapi,PDXostc/libfprint,ccsystems/libfprint,freedesktop-unofficial-mirror/libfprint__libfprint,sbambrough/libfprint_extended,abhishekgahlot/libfprint,payden/libfprint,dsd/libfprint,zemen/libfprint,kunalg/libfprint,ccsystems/libfprint,hyperair/fprint-bsapi,payden/libfprint,Gnate/libfprint,zemen/libfprint,micw/libfprint,abhishekgahlot/fprint-bsapi,zOrg1331/libfprint,kunalg/libfprint,iafilatov/libfprint,FabriceSalvaire/libfprint-baspi,sbambrough/libfprint_extended,yingted/etes603,abhishekgahlot/fprint-bsapi,jipumarino/libfprint,rmarku/libfprint,Gnate/libfprint,jipumarino/libfprint,yingted/etes603,freedesktop-unofficial-mirror/libfprint__libfprint,zOrg1331/libfprint,PDXostc/libfprint,yingted/etes603,rmarku/libfprint,hyperair/fprint-bsapi,micw/libfprint,abhishekgahlot/libfprint,payden/libfprint,zOrg1331/libfprint,Gnate/libfprint,anarsoul/libfprint,FabriceSalvaire/libfprint-baspi,jipumarino/libfprint,freedesktop-unofficial-mirror/libfprint__libfprint,micw/libfprint