DM-Steg: a deniably-encrypted block device

For an overview of the Steg specification and DM-Steg, see the .pdf file on http://dmsteg.sourceforge.net

You will need:
	- libdl. I understand this is part of libc.
	- A recent version of libdevmapper, distributed inside LVM2: ftp://sources.redhat.com/pub/lvm2/
	- A libcrypto with XTS support, included in OpenSSL >=1.1.0. This is not yet released so you'll have to go to http://www.openssl.org and grab the development sources from CVS. Rather than updating my system, I find it easier to keep a new libcrypto.a in my home directory and link to it statically. Change the Makefile if you want to link dynamically.

To install:
	make
	(as root) make install

To overwrite a device with pseudorandom data (you probably want to do this before you first use Steg on it):
	stegdisk <device/file>
		erase 0

To remove all traces of aspects from a device:
	stegdisk <device/file>
		nuke 0

To create an encrypted aspect directly on a block device:
	stegdisk <device/file>
		new 0 100% MyAspect
		write
		quit

To create two equal sized encrypted aspects inside a transparent aspect:
	stegdisk <device/file>
		new 0 100% Transparency -
		open 0
		new 0 50% AspectOne
		new 0 100% AspectTwo
		write
		quit

To set up your system for mounting aspects:
	Apply the kernel patch:
		cd linux-3.2-rc3
		patch -p1 < dmsteg-0.9-linux-3.2-rc3.patch
	Use menuconfig to enable DM-Steg. Enable:
		'General setup' -> 'Prompt for development and/or incomplete code/drivers'
		'Device drivers' -> 'Multiple device driver support (RAID and LVM)' -> 'DM-Steg target (EXPERIMENTAL)'
	Build and install a lovely new kernel:
		make
		make install
		make modules_install
	Add stegd to your bootup scripts
	Reboot with new kernel

To create a filesystem on an aspect:
	stegsetup <block device>
	mkreiserfs /dev/mapper/stegX	(the device stegsetup reported last)
	dmsetup remove_all

Once a filesystem is created, mount it like this:
	stegmount <block device> /mnt

And unmount it like this:
	stegumount <block device>
Or this:
	stegumount /mnt
	dmsetup remove /dev/mapper/stegX

Good luck!



And if you like this software, feel free to send me Bitcoins :)

	1BteMJCcWNKnPbJraCEM5HteiCCZS8NGTp

DM-Steg home page http://dmsteg.sourceforge.net

DM-Steg is hereby released in its entirety into the public domain. This means you may do with DM-Steg whatever you please, wherever you please, whenever you please, inasmuch as you please, for the rest of eternity. Having said that, I would kindly ask that you:

	1. Release all modified and derived works into the public domain
	2. Do not deviate from the specification without very good reason
	3. Give credit where credit is due

Also, please see the below boilerplate:

THIS SOFTWARE IS PROVIDED BY LEOPOLD SAMULIS ''AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL LEOPOLD SAMULIS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. LEOPOLD SAMULIS AND CONTRIBUTORS SHALL ALSO NOT BE LIABLE IF USE, POSESSION, OR TRANSMISSION OF THIS SOFTWARE GETS YOU IN TROUBLE WITH WHICHEVER LEGAL SYSTEM YOU LIVE UNDER.