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Diffstat (limited to 'src/mpi.cpp')
-rw-r--r-- | src/mpi.cpp | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/src/mpi.cpp b/src/mpi.cpp deleted file mode 100644 index 0a240fd..0000000 --- a/src/mpi.cpp +++ /dev/null @@ -1,203 +0,0 @@ -/* - * 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) 2007-2008 Othmar Gsenger, Erwin Nindl, - * Christian Pointner <satp@wirdorange.org> - * - * This file is part of Anytun. - * - * Anytun is free software: you can redistribute it and/or modify - * it under the terms of the GNU General Public License version 3 as - * published by the Free Software Foundation. - * - * Anytun 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 anytun. If not, see <http://www.gnu.org/licenses/>. - */ - -#include "mpi.h" - -#include "datatypes.h" -#include "cipher.h" - -#include <stdexcept> -#include <gcrypt.h> - -#include <iostream> -#include <cstring> - -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_ ); -} |