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#!/bin/sh
#
###################################################################
# paczor wrote this! :)                                           #
# Very primitive script that creates ext2 filesystem inside file  #
# encrypted with AES256 algorithm. You can mount this image as    #
# normal fs and all operation are transparently encrypted.        #
###################################################################
HASH=`head -c 15 /dev/urandom | uuencode -m - | head -2 | tail -1`
echo "Hash: $HASH" > ./HASH
echo ""
echo "Preparing file for encypted storage..."
read -p "give me the full path and name of image file:" CRYPT_FILE
read -p "give me the count of 4k sectors for dd tool:" COUNT
dd if=/dev/zero of=$CRYPT_FILE bs=4k count=$COUNT
echo "File $CRYPT_FILE was created."
echo ""
echo "Preparing mountpoint..."
read -p "give me the mount point (directory) where encrypted file \
will be mounted:" MOUNTPOINT
# If MOUNTPOINT doesn't exists make it
if [ -d ${MOUNTPOINT} ] ; then
echo "$MOUNTPOINT already exists!"
else
mkdir $MOUNTPOINT
echo "$MOUNTPOINT created!"
fi
echo ""
echo "Setting up loop device for encrypted storage..."
echo "You will be asked for password. It must be at least 20 characters long."
echo "Please, don't lose your password!!!"
read -p "give me the name of loop device you choose (ex. loop1):" LOOP
read -p "give me the count of password iteration count in units \
of thousands (integer):" ITERATION
losetup -e AES256 -T -S $HASH -C $ITERATION /dev/$LOOP $CRYPT_FILE
# Here goes the password question and then we'll make a filesystem
echo "Making EXT2 filesystem on the file/loop device..."
mkfs -t ext2 /dev/$LOOP
losetup -d /dev/$LOOP
echo "Adding mount options to /etc/fstab file for future use..."
echo "$CRYPT_FILE $MOUNTPOINT ext2 defaults,noauto,loop=/dev/$LOOP,\
encryption=AES256,itercountk=$ITERATION,pseed=$HASH 0 0" >> /etc/fstab
echo "Success!"
echo "Now you can mount your encrypted file with command: mount $MOUNTPOINT"