Clean crypto_util module.
Clean crypto_util module.

BillKeenan/lets-encrypt-preview,bestwpw/letsencrypt,jtl999/certbot,rlustin/letsencrypt,jsha/letsencrypt,BillKeenan/lets-encrypt-preview,ruo91/letsencrypt,mitnk/letsencrypt,beermix/letsencrypt,digideskio/lets-encrypt-preview,DavidGarciaCat/letsencrypt,rugk/letsencrypt,armersong/letsencrypt,letsencrypt/letsencrypt,ghyde/letsencrypt,TheBoegl/letsencrypt,lmcro/letsencrypt,twstrike/le_for_patching,lmcro/letsencrypt,xgin/letsencrypt,goofwear/letsencrypt,jmhodges/letsencrypt,vcavallo/letsencrypt,martindale/letsencrypt,diracdeltas/lets-encrypt-preview,armersong/letsencrypt,jmaurice/letsencrypt,ahojjati/letsencrypt,wteiken/letsencrypt,sjerdo/letsencrypt,rutsky/letsencrypt,mitnk/letsencrypt,brentdax/letsencrypt,sapics/letsencrypt,digideskio/lets-encrypt-preview,thanatos/lets-encrypt-preview,diracdeltas/lets-encrypt-preview,wteiken/letsencrypt,kuba/letsencrypt,modulexcite/letsencrypt,rutsky/letsencrypt,tyagi-prashant/letsencrypt,skynet/letsencrypt,twstrike/le_for_patching,bsmr-misc-forks/letsencrypt,jtl999/certbot,thanatos/lets-encrypt-preview,solidgoldbomb/letsencrypt,PeterMosmans/letsencrypt,tdfischer/lets-encrypt-preview,bestwpw/letsencrypt,rugk/letsencrypt,kuba/letsencrypt,Sveder/letsencrypt,hsduk/lets-encrypt-preview,stweil/letsencrypt,TheBoegl/letsencrypt,letsencrypt/letsencrypt,dietsche/letsencrypt,ghyde/letsencrypt,luorenjin/letsencrypt,Bachmann1234/letsencrypt,ahojjati/letsencrypt,BKreisel/letsencrypt,kevinlondon/letsencrypt,mrb/letsencrypt,solidgoldbomb/letsencrypt,fmarier/letsencrypt,lbeltrame/letsencrypt,goofwear/letsencrypt,fmarier/letsencrypt,skynet/letsencrypt,martindale/letsencrypt,jmaurice/letsencrypt,mrb/letsencrypt,VladimirTyrin/letsencrypt,deserted/letsencrypt,bsmr-misc-forks/letsencrypt,beermix/letsencrypt,modulexcite/letsencrypt,riseofthetigers/letsencrypt,stweil/letsencrypt,Hasimir/letsencrypt,ruo91/letsencrypt,jmhodges/letsencrypt,sapics/letsencrypt,brentdax/letsencrypt,g1franc/lets-encrypt-preview,piru/letsencrypt,kevinlondon/letsencrypt,piru/letsencrypt,DavidGarciaCat/letsencrypt,tyagi-prashant/letsencrypt,stewnorriss/letsencrypt,tdfischer/lets-encrypt-preview,vcavallo/letsencrypt,hlieberman/letsencrypt,VladimirTyrin/letsencrypt,hsduk/lets-encrypt-preview,BKreisel/letsencrypt,stewnorriss/letsencrypt,deserted/letsencrypt,Bachmann1234/letsencrypt,Jonadabe/letsencrypt,Jadaw1n/letsencrypt,Jonadabe/letsencrypt,riseofthetigers/letsencrypt,rlustin/letsencrypt,dietsche/letsencrypt,xgin/letsencrypt,g1franc/lets-encrypt-preview,Sveder/letsencrypt,luorenjin/letsencrypt,sjerdo/letsencrypt,hlieberman/letsencrypt,PeterMosmans/letsencrypt,Jadaw1n/letsencrypt,lbeltrame/letsencrypt,jsha/letsencrypt,Hasimir/letsencrypt