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dmsetup ls

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mkdir myreiser
mount -t reiserfs /dev/mapper/... myreiser

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root@Microknoppix:/home/knoppix# dmsetup ls
KNOPPIX-DATA	(250:0)
root@Microknoppix:/home/knoppix# cryptsetup -v status KNOPPIX-DATA
/dev/mapper/KNOPPIX-DATA is active and is in use.
  type:	PLAIN
  cipher:  aes-cbc-plain
  keysize: 256 bits
  device:  /dev/sda2
  offset:  0 sectors
  size:	3691491 sectors
  mode:	read/write
Befehl erfolgreich.

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# echo "SimSalaBim" | cryptsetup plainOpen /dev/sdb2 KNOPPIX-DATA --cipher=aes-cbc-plain --key-file=-
root@Microknoppix:/home/knoppix# mount -t reiserfs /dev/mapper/KNOPPIX-DATA mnt
mount: Falscher Dateisystemtyp, ungültige Optionen, der
Superblock von /dev/mapper/KNOPPIX-DATA ist beschädigt, fehlende
Kodierungsseite oder ein anderer Fehler

   	Manchmal liefert das Systemprotokoll wertvolle Informationen –
   	versuchen Sie  dmesg | tail  oder ähnlich

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root@Microknoppix:/home/knoppix# cryptsetup -v status KNOPPIX-DATA
/dev/mapper/KNOPPIX-DATA is active.
  type:	PLAIN
  cipher:  aes-cbc-plain
  keysize: 256 bits
  device:  /dev/sdb2
  offset:  0 sectors
  size:	3691491 sectors
  mode:	read/write
Befehl erfolgreich.

Quellcode

#!/bin/sh
#
# Microknopppix busybox-based initramfs bootscript
# (C) 2015 by Klaus Knopper <knoppix@knopper.net>
# LICENSE: GPL V2

# Its purpose: 
# 1. Mounting CD, DVD, Flashdisk or network drive,
# 2. unifying read-only compressed file system and ramdisk or file overlay,
# 3. give control to the real sysv init, which then continues to work like
#	we booted from a single disk partition.

DISTRO="Knoppix 7.7"
KVERSION="7.7.1-2016-10-22"

###########################################
# from here we start with a test
###########################################
# ich will Teile aus dem original-Script benutzen
# und damit dann eine verschlüsselte Overlay mounten
###########################################

home=/home/knoppix
lang=de

runknoppixlib(){
 local cmd="$1"; shift
 [ -r /UNIONFS/lib/ld-linux.so.2 -a -x "$cmd" ] && /UNIONFS/lib/ld-linux.so.2 --library-path "/UNIONFS/lib:/UNIONFS/usr/lib:/UNIONFS/lib/i386-linux-gnu" "$cmd" "$@"
 return "$?"
}

setkeyboard(){
 [ -n "$keyboard" ] || keyboard="$lang"
 [ -n "$keyboard" -a -x "/UNIONFS/bin/loadkeys" ] && /bin/loadkeys -q "$keyboard" >/dev/null 2>&1
}

# mountaes partition mountpoint filesystem [options]
mountaes(){
 local p="/dev/sdc2" mp="${2:-/KNOPPIX-DATAS}" fs="${3:-reiserfs}" mods="" m="" try="" h="" options="-o rw"
 [ -n "$4" ] && options="$4"
 for m in loop cryptoloop dm_crypt aes_generic aes_i586 cbc; do
  [ -d /sys/module/"$m" ] || mods="$mods $m"
 done
 [ -n "$mods" ] && /sbin/modprobe -a $mods >/dev/null 2>&1
 setkeyboard
 echo -n "${CYAN}$p "
  local h="" mapdev="${mp##*/}"
  if runknoppixlib /UNIONFS/sbin/cryptsetup create --key-size 256 --cipher aes "$mapdev" "$p"; then # Use dm-crypt
   h=/dev/mapper/"$mapdev"

   mount -t "$fs" $options "$h" "$mp" && return 0
  fi	
}

[ -d /KNOPPIX-DATAS ] || mkdir -m 755 /KNOPPIX-DATAS
mountaes

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root@Microknoppix:/home/knoppix# sh aes.sh 
/dev/sdc2 Passphrase eingeben: 
root@Microknoppix:/home/knoppix# ls /KNOPPIX-DATAS
etc  home  lost+found  root  sbin  usr  var
root@Microknoppix:/home/knoppix# umount /KNOPPIX-DATAS
root@Microknoppix:/home/knoppix# cryptsetup remove KNOPPIX-DATAS

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knoppix: > mkdir mnt
knoppix: > su
root@Microknoppix:/home/knoppix# cryptsetup create --key-size 256 --cipher aes Overlay /dev/sdb2
Passphrase eingeben:

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root@Microknoppix:/home/knoppix# ls /dev/mapper/
control  Overlay
root@Microknoppix:/home/knoppix# mount -t reiserfs -o rw /dev/mapper/Overlay /home/knoppix/mnt

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root@Microknoppix:/home/knoppix# mount | grep Over
/dev/mapper/Overlay on /home/knoppix/mnt type reiserfs (rw,relatime)
root@Microknoppix:/home/knoppix# ls mnt
etc  home  lost+found  root  sbin  usr  var

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root@Microknoppix:/home/knoppix# umount mnt
root@Microknoppix:/home/knoppix# ls mnt
root@Microknoppix:/home/knoppix# ls /dev/mapper/
control  Overlay
root@Microknoppix:/home/knoppix# cryptsetup remove Overlay
root@Microknoppix:/home/knoppix# ls /dev/mapper/
control

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root@Microknoppix:/home/knoppix# cryptsetup create --key-size 256 --cipher aes Overlay /dev/sdb2
Passphrase eingeben: 
root@Microknoppix:/home/knoppix# ls /dev/mapper/
control  Overlay
root@Microknoppix:/home/knoppix# mount -t reiserfs -o rw /dev/mapper/Overlay /home/knoppix/mnt
mount: Falscher Dateisystemtyp, ungültige Optionen, der
Superblock von /dev/mapper/Overlay ist beschädigt, fehlende
Kodierungsseite oder ein anderer Fehler

   	Manchmal liefert das Systemprotokoll wertvolle Informationen –
   	versuchen Sie  dmesg | tail  oder ähnlich
root@Microknoppix:/home/knoppix# dmesg | tail
[  231.586277] sd 11:0:0:0: [sdb] Attached SCSI removable disk
[  232.614926] FAT-fs (sdb1): utf8 is not a recommended IO charset for FAT filesystems, filesystem will be case sensitive!
[  232.624401] FAT-fs (sdb1): Volume was not properly unmounted. Some data may be corrupt. Please run fsck.
[  311.288457] REISERFS (device dm-0): found reiserfs format "3.6" with non-standard journal
[  311.288506] REISERFS (device dm-0): using ordered data mode
[  311.288509] reiserfs: using flush barriers
[  311.290360] REISERFS (device dm-0): journal params: device dm-0, size 512, journal first block 18, max trans len 256, max batch 225, max commit age 30, max trans age 30
[  311.290405] REISERFS (device dm-0): checking transaction log (dm-0)
[  311.336468] REISERFS (device dm-0): Using r5 hash to sort names
[  442.099672] REISERFS warning (device dm-0): sh-2021 reiserfs_fill_super: can not find reiserfs on dm-0