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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"
#include "log.h"
#include "buffer.h"
#include "authTag.h"
#include "threadUtils.hpp"
#include <gcrypt.h>
AuthTag NullAuthAlgo::calc(const Buffer& buf)
{
return AuthTag(0);
}
const char* Sha1AuthAlgo::MIN_GCRYPT_VERSION = "1.2.3";
// HMAC_SHA1
Sha1AuthAlgo::Sha1AuthAlgo() : ctx_(NULL)
{
Lock lock(mutex_);
gcry_error_t err;
// No other library has already initialized libgcrypt.
if( !gcry_control(GCRYCTL_ANY_INITIALIZATION_P) )
{
if( !gcry_check_version( MIN_GCRYPT_VERSION ) ) {
cLog.msg(Log::PRIO_ERR) << "Sha1AuthAlgo::Sha1AuthAlgo: Invalid Version of libgcrypt, should be >= " << MIN_GCRYPT_VERSION;
return;
}
/* Tell Libgcrypt that initialization has completed. */
err = gcry_control(GCRYCTL_INITIALIZATION_FINISHED);
if( err ) {
cLog.msg(Log::PRIO_CRIT) << "Sha1AuthAlgo::Sha1AuthAlgo: Failed to finish the initialization of libgcrypt: " << gpg_strerror( err );
return;
} else {
cLog.msg(Log::PRIO_DEBUG) << "Sha1AuthAlgo::Sha1AuthAlgo: libgcrypt init finished";
}
}
err = gcry_md_open( &ctx_, GCRY_MD_SHA1, GCRY_MD_FLAG_HMAC );
if( err )
cLog.msg(Log::PRIO_CRIT) << "Sha1AuthAlgo::Sha1AuthAlgo: Failed to open message digest algo";
}
Sha1AuthAlgo::~Sha1AuthAlgo()
{
Lock lock(mutex_);
gcry_md_close( ctx_ );
cLog.msg(Log::PRIO_DEBUG) << "Sha1AuthAlgo::~Sha1AuthAlgo: closed hmac handler";
}
void Sha1AuthAlgo::setKey(Buffer key)
{
Lock lock(mutex_);
gcry_error_t err;
err = gcry_md_setkey( ctx_, key.getBuf(), key.getLength() );
if( err )
cLog.msg(Log::PRIO_ERR) << "Sha1AuthAlgo::setKey: Failed to set cipher key: " << gpg_strerror( err );
}
AuthTag Sha1AuthAlgo::calc(const Buffer& buf)
{
Lock lock(mutex_);
// gcry_error_t err;
AuthTag hmac(10); // 10byte
gcry_mpi_t tmp = gcry_mpi_new(160); // 20byte
gcry_md_write( ctx_, static_cast<Buffer>(buf).getBuf(), buf.getLength() );
gcry_md_final( ctx_ );
gcry_mpi_scan( &tmp, GCRYMPI_FMT_STD, gcry_md_read(ctx_, 0), 20, NULL );
gcry_mpi_clear_highbit( tmp, 81 ); // truncate hmac from 20byte to 10byte
gcry_mpi_print( GCRYMPI_FMT_STD, hmac, hmac.getLength(), NULL, tmp );
return hmac;
}
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