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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 "mpi.h"
#include "datatypes.h"
#include "cypher.h"
#include <stdexcept>
#include <gcrypt.h>
Mpi::Mpi()
{
val_ = gcry_mpi_new(1);
}
Mpi::Mpi(u_int8_t length)
{
val_ = gcry_mpi_new(length);
}
Mpi::Mpi(const Mpi &src)
{
val_ = gcry_mpi_copy(src.val_);
}
Mpi::Mpi(const u_int8_t * src, u_int32_t len)
{
gcry_mpi_scan( &val_, GCRYMPI_FMT_STD, src, len, NULL );
}
void Mpi::operator=(const Mpi &src)
{
val_ = gcry_mpi_copy(src.val_);
}
void Mpi::operator=(const long unsigned int src)
{
gcry_mpi_set_ui(val_, src);
}
Mpi Mpi::operator+(const Mpi &b) const
{
Mpi res;
gcry_mpi_add(res.val_, val_, b.val_);
return res;
}
Mpi Mpi::operator*(const unsigned long int n) const
{
Mpi res;
gcry_mpi_mul_ui(res.val_, val_, n);
return res;
}
Mpi Mpi::operator^(const Mpi &b) const
{
u_int32_t a_len=0, b_len=0;
Mpi res;
a_len = gcry_mpi_get_nbits(val_);
b_len = gcry_mpi_get_nbits(b.val_);
if(a_len>=b_len)
res = Mpi(*this);
else
res = Mpi(b);
for(u_int32_t i=0; i<a_len && i<b_len; i++) {
if(gcry_mpi_test_bit(val_, i) ^ gcry_mpi_test_bit(b.val_, i))
gcry_mpi_set_bit(res.val_, i);
}
return res;
}
void Mpi::rShift(u_int8_t n)
{
gcry_mpi_rshift(val_, val_, n);
}
Mpi Mpi::mul2exp(u_int32_t e) const
{
Mpi res;
gcry_mpi_mul_2exp( res.val_, val_, e );
return res;
}
Buffer Mpi::getBuf() const
{
u_int32_t len = 0, written = 0;
len = gcry_mpi_get_nbits( val_ );
Buffer res(static_cast<u_int32_t>(len/8)+1);
gcry_mpi_print( GCRYMPI_FMT_STD, res, len, &written, val_ );
return res;
}
u_int32_t Mpi::getLen() const
{
return gcry_mpi_get_nbits( val_ );
}
Mpi::~Mpi()
{
gcry_mpi_release( val_ );
}
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