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/*
* anytun
*
* The secure anycast tunneling protocol (satp) defines a protocol used
* for communication between any combination of unicast and anycast
* tunnel endpoints. It has less protocol overhead than IPSec in Tunnel
* mode and allows tunneling of every ETHER TYPE protocol (e.g.
* ethernet, ip, arp ...). satp directly includes cryptography and
* message authentication based on the methodes used by SRTP. It is
* intended to deliver a generic, scaleable and secure solution for
* tunneling and relaying of packets of any protocol.
*
*
* Copyright (C) 2007 anytun.org <satp@wirdorange.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program (see the file COPYING included with this
* distribution); if not, write to the Free Software Foundation, Inc.,
* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "authAlgo.h"
extern "C" {
#include <gcrypt.h>
}
AuthTag NullAuthAlgo::calc(const Buffer& buf)
{
return AuthTag(0);
}
// HMAC_SHA1
AuthTag HmacAuthAlgo::calc(const Buffer& buf)
{
gcry_error_t err;
gcry_md_hd_t ctx;
Buffer hmac; //80bit
err = gcry_md_open( &ctx, GCRY_MD_SHA1, GCRY_MD_FLAG_HMAC );
//gcry_md_setkey( ctx, key, keylen );
gcry_md_write( ctx, static_cast<Buffer>(buf).getBuf(), buf.getLength() );
gcry_md_final( ctx );
hmac = Buffer(gcry_md_read( ctx, 0 ), 10);
gcry_md_close( ctx );
return hmac;
}
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