crypto: check key for validity
crypto: check key for validity

stuertz/restic,arithmetric/restic,kurin/restic,middelink/restic,middelink/restic,ar-jan/restic,restic/restic,byo/restic,jayme-github/restic,howeyc/restic,bchapuis/restic,ar-jan/restic,fawick/restic,kurin/restic,stuertz/restic,mappu/restic,restic/restic,byo/restic,fawick/restic,episource/restic,ckemper67/restic,jayme-github/restic