ecc25519-fhmqvc: add doxygen comments to the key check functions
ecc25519-fhmqvc: add doxygen comments to the key check functions

fpletz/fastd,rlei/fastd-android,rlei/fastd-android,fpletz/fastd,rlei/fastd-android,rlei/fastd-android,rlei/fastd-android,fpletz/fastd,fpletz/fastd,fpletz/fastd