.. highlight:: sh

.. _OpenSC with PACE: http://github.com/frankmorgner/OpenSC
.. _OpenPACE: http://openpace.sourceforge.net


.. _npa:

********************************************************************************
nPA Smart Card Library
********************************************************************************

:Author:
    Frank Morgner <morgner@informatik.hu-berlin.de>
:License:
    GPL version 3
:Tested Platforms:
    - Linux (Debian, Ubuntu, OpenMoko)
    - Windows
:Potential Platforms:
    Unix-like operating systems (Mac OS, Solaris, BSD, ...)

Welcome to the nPA Smart Card Library. The purpose of the nPA Smart Card Library is to offer an easy to use API for the new
German identity card (neuer Personalausweis, nPA). The library also implements
secure messaging, which could also be used for other cards.

The nPA Smart Card Library is implemented using OpenPACE_.
Some fragments of the source code are based on the source code of the OpenSC tools.

The included npa-tool has support for Password Authenticated Connection
Establishment (PACE). npa-tool can be used for PIN management or to encrypt
APDUs inside a secure messaging channel established with PACE.


.. _npa-install:

.. include:: autotools.rst

The nPA Smart Card Library has the following dependencies:

- `OpenSC with PACE`_
- OpenSSL with OpenPACE_


------------------------------
Hints on OpenSSL with OpenPACE
------------------------------

The nPA Smart Card Library links against OpenSSL, which must be patched with OpenPACE_.
Here is an example of how to get the standard installation of OpenSSL with
OpenPACE_::
 
    PREFIX=/tmp/install
    OPENPACE=openpace
    svn co https://openpace.svn.sourceforge.net/svnroot/openpace $OPENPACE
    cd $OPENPACE
    make patch_with_openpace
    cd openpace
    ./config experimental-pace --prefix=$PREFIX
    make depend
    make
    make install

Building the nPA Smart Card Library with OpenPACE_ is done best using :command:`pkg-config`.  The file
:file:`libcrypto.pc` should be located in ``$INSTALL/lib/pkgconfig``. Here is how
to configure the nPA Smart Card Library to use it::

    ./configure PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig


---------------
Hints on OpenSC
---------------

The nPA Smart Card Library links against OpenSC, which is discouraged and hindered
since OpenSC version >= 0.12. However, I extended OpenSC to support smart card
readers with PACE capabilities. You need the OpenSC components to be installed
(especially :file:`libopensc.so`). Here is an example of how to get the
standard installation of `OpenSC with PACE`_::

    PREFIX=/tmp/install
    OPENSC=opensc
    git clone git://github.com/frankmorgner/OpenSC.git $OPENSC
    cd $OPENSC
    autoreconf -i
    # adding PKG_CONFIG_PATH here lets OpenSC use OpenSSL with OpenPACE
    ./configure --prefix=$PREFIX PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig
    make
    make install

Now :file:`libopensc.so` should be located in ``$PREFIX/lib``. Here is how to
configure the nPA Smart Card Library to use it::

    ./configure OPENSC_LIBS="-L$PREFIX/lib -lopensc"


.. _npa-usage:

=====
Usage
=====

When testing PACE with either PIN, CAN, MRZ or PUK run npa-tool. Here you can
enter APDUs which are to be converted according to the secure messaging
parameter and to be sent to the card. Herefor insert the APDU in hex (upper or
lower case) with a colon to separate the bytes or without it. Example APDUs can
be found in the file apdus.

To pass a secret to npa-tool, the command line parameters or the environment
variables PIN/CAN/MRZ/PUK/NEWPIN can be used. If none of these options is used,
npa-tool will show a password prompt.

.. program-output:: npa-tool --help

----------------------
Linking against libnpa
----------------------

Following the section `Installation`_ above, you have installed `OpenSC with
PACE`_, OpenPACE_ and the nPA Smart Card Library to :file:`/tmp/install`. To compile a
program using nPA Smart Card Library you need to get the header files from `OpenSC with
PACE`_ as well.  Here is how to compile an external program with these
libraries::

    PREFIX=/tmp/install
    OPENSC=opensc
    git clone git://github.com/frankmorgner/OpenSC.git $OPENSC
    cc example.c -I$OPENSC/src \
        $(env PKG_CONFIG_PATH=$PREFIX/lib/pkgconfig \
            pkg-config --cflags --libs npa)

Alternatively you can specify libraries and flags by hand::

    PREFIX=/tmp/install
    OPENSC=opensc
    git clone git://github.com/frankmorgner/OpenSC.git $OPENSC
    cc example.c -I$OPENSC/src \
        -I$PREFIX/include \
        -L$PREFIX/lib -lcrypto -lnpa -lopensc"


.. include:: questions.rst