First i've copied two 1.5-1.8 gbyte files on the luks test microSD, with samba,
then see the checksums:
cubie@cubieboard2:~$ sha1sum "/mnt/lukstest/dvdmasol.iso"
af645bcb47a0c6ab41e3c95a380fa839394a2dc9 /mnt/lukstest/dvdmasol.iso
cubie@cubieboard2:~$ sha1sum "/mnt/lukstest/xpeee.vdi"
bac8cb2601fb07985436b745f67d25c98e7d7e02 /mnt/lukstest/xpeee.vdi
cubie@cubieboard2:~$ sudo umount /mnt/lukstest
umount: /mnt/lukstest: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
cubie@cubieboard2:~$ sudo umount /mnt/lukstest
cubie@cubieboard2:~$ sudo cryptsetup luksClose testik
cubie@cubieboard2:~$ sudo sh -c 'echo 3 >/proc/sys/vm/drop_caches'
cubie@cubieboard2:~$ sudo cryptsetup luksOpen /dev/sdb testik
Enter passphrase for /dev/sdb:
cubie@cubieboard2:~$ sudo mount -t ext4 /dev/mapper/testik /mnt/lukstest
cubie@cubieboard2:~$ sha1sum "/mnt/lukstest/dvdmasol.iso"
af645bcb47a0c6ab41e3c95a380fa839394a2dc9 /mnt/lukstest/dvdmasol.iso
cubie@cubieboard2:~$ sha1sum "/mnt/lukstest/xpeee.vdi"
9a81183ffe4cdb6a75688f8786bfb3f061c9121a /mnt/lukstest/xpeee.vdi
cubie@cubieboard2:~$ sha1sum "/mnt/lukstest/dvdmasol.iso"
76e4603badbe853e4cbe11c6ea2dc53d7b0d1285 /mnt/lukstest/dvdmasol.iso
cubie@cubieboard2:~$
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