NAME

       Crypt::U2F::Server - Low level wrapper around the U2F two factor authentication C library
       (server side)

SYNOPSIS

         use Crypt::U2F::Server;

DESCRIPTION

       This is a very low level wrapper around the original C library. You probably shouldn't use
       it, but use Crypt::U2F::Server::Simple instead!

       This API is subject to change, depending on the underlying library, the weather and the
       whims of the developer.

       If you decide to use it anyway, it would probably be a good idea to specify the exact
       version number of Crypt::U2F::Server to use.

INSTALLATION

       This module requires the Yubico u2f-server shared library installed, please see the
       official project page at <https://developers.yubico.com/libu2f-server/> on how to do that.

NO MULTITHREADING / MULTI INSTANCES

       The way this is currently implemented, i doubt very much that multithreading or even use
       in more than one instance in your program will work. Multi-Forking should be OK, though,
       if you only call u2fclib_init() after forking, but this isn't tested as of yet.

       The problem is how u2fclib_init() and u2fclib_deInit() are implemented. While the
       underlying library has a context-handle (not used here), u2fclib_deInit() will tear down
       everything as far as i can tell.

       Crypt::U2F::Server::Simple works around this problem by reference counting and always
       requiring all values to call the relevant u2fclib_set* functions.

   EXPORT
       None by default.

   Exportable functions
         char* u2fclib_calcRegistrationChallenge(void* ctx)
         int u2fclib_deInit(void)
         int u2fclib_free_context(void* ctx)
         char* u2fclib_getError(void)
         void* u2fclib_get_context(void)
         int u2fclib_init(bool debug)
         int u2fclib_setAppID(void* ctx, char* appid)
         int u2fclib_setChallenge(void* ctx, char* challenge)
         int u2fclib_setKeyHandle(void* ctx, char* buf)
         int u2fclib_setOrigin(void* ctx, char* origin)
         int u2fclib_setPublicKey(void* ctx, char* buf)
         int u2fclib_verifyAuthentication(void* ctx, char* buf)
         registrationData_t* u2fclib_verifyRegistration(void* ctx, char* buf)

SEE ALSO

       See Crypt::U2F::Server::Simple for the module you should actually be using.

BUGS

       Yes, there should be some in there. First of all, this is crypto stuff, so it's broken by
       default (it only depends on the time it takes to happen).

       Also, at the moment, this module has seen only very limited testing.

AUTHOR

       Rene Schickbauer, <rene.schickbauer@magnapowertrain.com>
       Xavier Guimard, <x.guimard@free.fr>

COPYRIGHT AND LICENSE

       Adapted as a Perl library by Rene 'cavac' Schickbauer

       This roughly based on u2f-server.c from Yubico's C library, see
       <https://developers.yubico.com/libu2f-server/>

       In order for this to work, you need to install that library.

       This adaption is (C) 2014-2018 Rene 'cavac' Schickbauer and 2018 Xavier Guimard, but as it
       is based on Yubico's code, the licence below applies!

       We, the community, would hereby thank Yubico for open sourcing their code!

           /*
           * Copyright (c) 2014 Yubico AB
           * All rights reserved.
           *
           * Redistribution and use in source and binary forms, with or without
           * modification, are permitted provided that the following conditions are
           * met:
           *
           * * Redistributions of source code must retain the above copyright
           * notice, this list of conditions and the following disclaimer.
           *
           * * Redistributions in binary form must reproduce the above
           * copyright notice, this list of conditions and the following
           * disclaimer in the documentation and/or other materials provided
           * with the distribution.
           *
           * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
           * "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 THE COPYRIGHT
           * OWNER 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.
           */