I'm making a program that will allow the user to use multiple ciphers
together (twofish -> aes -> etc) I would store the encryption they
wanted into a vector and store the order and encryption methods in the
file. The problem is I'm not quite sure how to implement this. this is
what i have so far. I though it would work but it keeps segfaulting in
crypto++
gdb's output = 0x00007ffff762be06 in
CryptoPP::Rijndael_Enc_AdvancedProcessBlocks(void*, unsigned int
const*) () from /usr/lib/libcrypto++.so.8
@note i'm not good with gdb just the basics
#include <cstdio>
#include <iostream>
#include <fstream>
#include <fcntl.h>
#include <algorithm>
#include <boost/program_options.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/iostreams/device/file_descriptor.hpp>
#include <boost/iostreams/stream.hpp>
#include <boost/algorithm/string.hpp>
#include <cryptopp/sha.h>
#include <cryptopp/hex.h>
#include <cryptopp/filters.h>
#include <cryptopp/files.h>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include <cryptopp/modexppc.h>
#include <cryptopp/hmac.h>
#include <cryptopp/osrng.h>
#include <cryptopp/rng.h>
#include <cryptopp/pwdbased.h>
#include <cryptopp/base64.h>
using namespace CryptoPP;
using namespace std;
using namespace boost;
namespace po = boost::program_options;
namespace std
{
template<class A1, class A2>
ostream& operator<<(ostream& s, vector<A1, A2> const& vec)
{
if(vec.size() > 0) s << vec.at(0);
for(size_t i = 1; i < vec.size(); i++)
s << "," << vec.at(i);
return s;
}
}
//TODO split all of this into different files
int main(int argc, char * argv[])
{
/** just for demo */
bool encrypt = true;
if(encrypt)
{
AutoSeededRandomPool rng;
SecByteBlock salt1(64), salt2(64), passwd(10);
rng.GenerateBlock(salt1,salt1.size());
rng.GenerateBlock(salt2,salt2.size());
rng.GenerateBlock(passwd,passwd.size());
/** key derivation function */
PKCS5_PBKDF2_HMAC<SHA512> pbkdf;
/** derived key (storage) */
SecByteBlock derived(512);
pbkdf.DeriveKey(derived,derived.size(),
0,passwd,passwd.size(),salt1,salt1.size(),10);
/** just for demo */
vector<string> algs;
algs.push_back("aes");
// algs.push_back("twofish"); //TODO add this
SecByteBlock iv(AES::BLOCKSIZE);
rng.GenerateBlock(iv,iv.size());
typedef boost::shared_ptr<StreamTransformation> TransPtr;
typedef boost::shared_ptr<BlockCipher> BlockCPtr;
vector< TransPtr > tranformations;
vector< BlockCPtr > blockciphers;
BufferedTransformation * prev = new FileSink(cout);
for(size_t i = 0; i < algs.size(); i++)
{
BlockCipher * cipher = NULL;
if(iequals("aes",algs.at(i)))
{
cerr << "using cipher 'aes'" << endl;
AES::Encryption * aes = new AES::Encryption();
blockciphers.push_back(BlockCPtr(aes));
cipher = aes;
}
else /** invalid cipher */
{
cerr << "invalid cipher '" << algs.at(i) << "'"
<< endl;
exit(1);
}
if(cipher)
{
StreamTransformation * filt = NULL;
string mode = "ofb";
if(iequals("ofb",mode))
{
cerr << "using block cipher mode 'ofb'"
<< endl;
OFB_Mode_ExternalCipher::Encryption *
enc =
new
OFB_Mode_ExternalCipher::Encryption(*cipher,iv);
filt = enc;
}
else /** invalid mode */
{
cerr << "invalid cipher mode of
operation '" << mode << "'" <<
endl;
exit(1);
}
if(filt)
{
cerr << "adding filter @ " << std::hex
<< filt << endl;
tranformations.push_back(TransPtr(filt));
prev = new
StreamTransformationFilter(*filt,prev);
cerr << "prev = " << std::hex << prev
<< endl;
}
}
}
cerr << "alg = " << prev->AlgorithmName() << endl;
cerr << "prev = " << std::hex << prev << endl;
/** demo only */
int fd = fileno(stdin);
boost::iostreams::file_descriptor_source fdsrc(fd);
boost::iostreams::stream<boost::iostreams::file_descriptor_source>
ifstm(fdsrc);
std::istream & std_ifstm = ifstm;
FileSource(std_ifstm,true,prev);
}
else
{
cerr << "wtf... unknown mode" << endl;
}
return 0;
}
there are uneeded header files included but thats because alot of
code has been removed. I test and compiled this using this makefile
and it crashes
TARGET = tomb-dbg
OBJS = main.o
CFLAGS = -O2 -g -Wall
CXXFLAGS = $(CFLAGS) -fmessage-length=0
ASFLAGS = $(CFLAGS)
INCS = -I/usr/include -I/usr/local/include -I.
LIBS = -lboost_program_options -lboost_iostreams -lcrypto++
CFLAGS += $(INCS)
$(TARGET): $(OBJS)
$(CXX) -o $(TARGET) $(OBJS) $(LIBS)
all: $(TARGET)
clean:
rm -f $(OBJS) $(TARGET)
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