diff --git a/scripts/prepare-dm-create-script.sh b/scripts/prepare-dm-create-script.sh
new file mode 100755
index 0000000..d10deb4
--- /dev/null
+++ b/scripts/prepare-dm-create-script.sh
@@ -0,0 +1,74 @@
+#!/bin/bash
+
+TOPDIR=$1
+STAGING_DIR_HOST=$2
+squashfs=$3
+dm_crypt_cfg=$4
+
+SECTOR_SIZE=512
+BLOCK_SIZE=4096
+
+align_up() {
+    local offset=$1
+    local size=$2
+
+    echo $(((($offset + ($size - 1)) / $size) * $size))
+}
+
+verity_get_meta() {
+    local needle="$1"
+    local haystack="$2"
+
+    echo "$haystack" | grep "$needle" | cut -d: -f2 | tr -d '[ \t]'
+}
+
+
+if [[ "$dm_crypt_cfg" == "y" ]]; then
+CRYPT_KEY_SIZE=32
+FIXED_KEY=2f54e5b40c9de5e4700d52f5d3938c1fd19a1d5e05b9dcf74c34a653b4b73ff5
+RANDOM_KEY=$(openssl rand -hex $CRYPT_KEY_SIZE)
+
+openssl enc -aes-$(($CRYPT_KEY_SIZE * 8))-ecb -e -in $squashfs -out "$squashfs"_enc -K $RANDOM_KEY
+mv "$squashfs"_enc $squashfs
+
+ENCRYPTED_KEY=$(echo -ne $RANDOM_KEY | perl -ne 'print pack "H*", $_' | openssl enc \
+                -aes-$(($CRYPT_KEY_SIZE * 8))-ecb -K $FIXED_KEY -nopad | perl -ne 'print unpack "H*", $_' | tr -d '\n')
+fi
+
+VERITY_HASH_OFFSET=$(align_up $(stat --format=%s $squashfs) $BLOCK_SIZE)
+VERITY_HASH_BLOCKS=$(($VERITY_HASH_OFFSET / $BLOCK_SIZE))
+#echo "hash-blocks:"${VERITY_HASH_BLOCKS}
+
+VERITY_META="$(veritysetup format \
+    --hash-offset=$VERITY_HASH_OFFSET \
+    "$squashfs" "$squashfs")"
+
+#echo "VERITY_META= :"${VERITY_META}
+
+VERITY_SALT=$(verity_get_meta Salt "$VERITY_META")
+VERITY_ROOT=$(verity_get_meta Root "$VERITY_META")
+
+ROOT_SECTORS=$(($VERITY_HASH_OFFSET / $SECTOR_SIZE))
+
+ROOT_VERITY="$VERITY_ROOT $VERITY_SALT"
+SMASH_DM_MOD_CREATE="ROOT_SECTORS=$ROOT_SECTORS:HASH_BLOCKS=$VERITY_HASH_BLOCKS:HASHSALT=$ROOT_VERITY"
+if [[ "$dm_crypt_cfg" == "y" ]]; then
+SMASH_DM_MOD_CREATE="$SMASH_DM_MOD_CREATE:ENCRYPTED_KEY=$ENCRYPTED_KEY"
+fi
+DM_SIZE=`echo ${#SMASH_DM_MOD_CREATE}`
+
+DM_ALIGN_SIZE=0x20000
+ROOT_FS_SIZE=$(stat -c%s "$squashfs")
+
+BLOCK_MUL_SIZE=$(($ROOT_FS_SIZE / $DM_ALIGN_SIZE))
+
+if [ $(($ROOT_FS_SIZE % $DM_ALIGN_SIZE)) -eq 0 ]; then
+    APPEND_POS=$ROOT_FS_SIZE
+else
+    APPEND_POS=$((($BLOCK_MUL_SIZE + 1) * $DM_ALIGN_SIZE))
+fi
+
+FILL_SIZE=$(($APPEND_POS - $ROOT_FS_SIZE))
+dd if=/dev/zero of=$squashfs conv=notrunc bs=1 seek=$ROOT_FS_SIZE count=$FILL_SIZE
+echo -n -e "DM_SIZE=$DM_SIZE:"${SMASH_DM_MOD_CREATE} | dd of=$squashfs conv=notrunc bs=1 seek=$APPEND_POS
+