146 lines
3.0 KiB
C++
146 lines
3.0 KiB
C++
/*
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* steghide 0.5.1 - a steganography program
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* Copyright (C) 1999-2003 Stefan Hetzl <shetzl@chello.at>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <cstdlib>
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#include <string>
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#include <mhash.h>
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#include "BitString.h"
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#include "common.h"
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#include "error.h"
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#include "MHashPP.h"
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MHashPP::MHashPP ()
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{
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hashing = false ;
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HashBytesValid = false ;
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}
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MHashPP::MHashPP (hashid id)
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{
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init (id) ;
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}
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void MHashPP::init (hashid id)
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{
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if ((HashD = mhash_init (id)) == MHASH_FAILED) {
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throw SteghideError (_("could not initialize libmhash %s algorithm."), getAlgorithmName(id).c_str()) ;
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}
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hashing = true ;
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HashBytesValid = false ;
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}
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const std::vector<BYTE>& MHashPP::end ()
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{
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myassert (hashing) ;
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unsigned int n = getHashSize() ;
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HashBytes = std::vector<BYTE> (n) ;
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BYTE hash[n] ;
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mhash_deinit (HashD, hash) ;
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hashing = false ;
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for (unsigned int i = 0 ; i < n ; i++) {
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HashBytes[i] = hash[i] ;
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}
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HashBytesValid = true ;
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return HashBytes ;
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}
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unsigned int MHashPP::getHashSize (void)
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{
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myassert (hashing) ;
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return ((unsigned int) mhash_get_block_size (mhash_get_mhash_algo (HashD))) ;
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}
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MHashPP& MHashPP::operator<< (std::string v)
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{
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myassert (hashing) ;
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mhash (HashD, v.data(), v.size()) ;
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return *this ;
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}
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MHashPP& MHashPP::operator<< (BitString v)
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{
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myassert (hashing) ;
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myassert (v.getLength() % 8 == 0) ;
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unsigned long n = v.getLength() / 8 ;
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for (unsigned int i = 0 ; i < n ; i++) {
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(*this) << (BYTE) v.getValue (8 * i, 8) ;
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}
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return *this ;
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}
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MHashPP& MHashPP::operator<< (BYTE v)
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{
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myassert (hashing) ;
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mhash (HashD, &v, 1) ;
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return *this ;
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}
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MHashPP& MHashPP::operator<< (MHashPP::Command c)
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{
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switch (c) {
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case endhash:
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HashBytes = end() ;
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break ;
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default:
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myassert (0) ;
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break ;
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}
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return *this ;
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}
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std::string MHashPP::getAlgorithmName ()
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{
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myassert (hashing) ;
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return getAlgorithmName (mhash_get_mhash_algo (HashD)) ;
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}
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std::string MHashPP::getAlgorithmName (hashid id)
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{
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char *name = (char *) mhash_get_hash_name (id) ;
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std::string retval ;
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if (name == NULL) {
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retval = std::string ("<algorithm not found>") ;
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}
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else {
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retval = std::string (name) ;
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}
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free (name) ;
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return retval ;
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}
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BitString MHashPP::getHashBits ()
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{
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myassert (HashBytesValid) ;
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return BitString (HashBytes) ;
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}
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const std::vector<BYTE>& MHashPP::getHashBytes()
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{
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myassert (HashBytesValid) ;
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return HashBytes ;
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}
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