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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 "cipher.h"
#include <stdexcept>
#include <gcrypt.h>
#include <iostream>
Mpi::Mpi() : val_(NULL)
{
val_ = gcry_mpi_set_ui(NULL, 0);
if(!val_)
throw std::bad_alloc();
}
Mpi::Mpi(u_int8_t length) : val_(NULL)
{
val_ = gcry_mpi_new(length);
if(!val_)
throw std::bad_alloc();
}
Mpi::Mpi(const Mpi &src) : val_(NULL)
{
val_ = gcry_mpi_copy(src.val_);
if(!val_)
throw std::bad_alloc();
}
Mpi::Mpi(const u_int8_t* src, u_int32_t len) : val_(NULL)
{
u_int8_t* src_cpy = new u_int8_t[len+1];
if(!src_cpy)
throw std::bad_alloc();
u_int8_t* buf = src_cpy;
u_int32_t buf_len = len;
if(src[0] & 0x80) // this would be a negative number, scan can't handle this :(
{
src_cpy[0] = 0;
buf++;
buf_len++;
}
std::memcpy(buf, src, len);
gcry_mpi_scan( &val_, GCRYMPI_FMT_STD, src_cpy, buf_len, NULL );
delete[] src_cpy;
if(!val_)
throw std::bad_alloc();
}
Mpi::~Mpi()
{
gcry_mpi_release( val_ );
}
void Mpi::operator=(const Mpi &src)
{
gcry_mpi_release( val_ );
val_ = gcry_mpi_copy(src.val_);
if(!val_)
throw std::bad_alloc();
}
void Mpi::operator=(const u_int32_t src)
{
gcry_mpi_release( val_ );
val_ = gcry_mpi_set_ui(NULL, src);
if(!val_)
throw std::bad_alloc();
}
Mpi Mpi::operator+(const Mpi &b) const
{
Mpi res;
gcry_mpi_add(res.val_, val_, b.val_);
return res;
}
Mpi Mpi::operator+(const u_int32_t &b) const
{
Mpi res;
gcry_mpi_add_ui(res.val_, val_, b);
return res;
}
Mpi Mpi::operator*(const u_int32_t n) const
{
Mpi res;
gcry_mpi_mul_ui(res.val_, val_, n);
return res;
}
Mpi Mpi::operator/(const Mpi &b) const
{
Mpi res;
gcry_mpi_div(res.val_, NULL, val_, b.val_, 0);
return res;
}
//TODO: this is outstandingly ugly!!!!!!!!
Mpi Mpi::operator^(const Mpi &b) const
{
u_int32_t a_len = gcry_mpi_get_nbits(val_);
u_int32_t b_len = gcry_mpi_get_nbits(b.val_);
Mpi res = (a_len >= b_len) ? Mpi(*this) : 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);
else
gcry_mpi_clear_bit(res.val_, i);
}
return res;
}
Mpi Mpi::mul2exp(u_int32_t e) const
{
Mpi res;
gcry_mpi_mul_2exp( res.val_, val_, e );
return res;
}
//TODO: problem, seems as gcry_mpi_(a)print doesn't work for mpi values of '0'
u_int8_t* Mpi::getNewBuf(size_t* written) const
{
u_int8_t* res_cpy;
gcry_mpi_aprint( GCRYMPI_FMT_STD, &res_cpy, written, val_ );
if(!res_cpy)
throw std::bad_alloc();
u_int8_t* buf = res_cpy;
if(*written > 1 && ! (res_cpy[0])) // positive number with highestBit set
{
buf++;
(*written)--;
}
u_int8_t* res = new u_int8_t[*written];
if(!res)
throw std::bad_alloc();
std::memcpy(res, buf, *written);
gcry_free(res_cpy);
return res;
}
//TODO: why does this not work ?????
std::string Mpi::getHexDump() const
{
// u_int8_t *buf;
// u_int32_t len;
// gcry_mpi_aprint( GCRYMPI_FMT_HEX, &buf, &len, val_ );
// std::string res(buf, len);
// delete[] buf;
gcry_mpi_dump( val_ );
std::string res("\n");
return res;
}
u_int32_t Mpi::getLength() const
{
return gcry_mpi_get_nbits( val_ );
}
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