Compiling & using Crypto++ with mingw version of Qt

[FS Lover]

Hi pals!
I personally had much trouble with these.
apparently compiled version of crypto++ (cryptopp530win32win64.zip) is build using MSVC and does not work with mingw.
fortunately I could get it to work finally.
so I tell you too, step by step, how to do it.

first download the cryptopp552.zip (crypto++ v5.5.2 sources)
why cryptopp552.zip? apparently this is the latest version that is successfully compiled with mingw.

extract the contents of the cryptopp552.zip to C:\cryptopp552

edit the C:\cryptopp552\fipstest.cpp and replace every 'OutputDebugString' with 'OutputDebugStringA'. (3 replacements in total)
don't forget to save it!

delete the C:\cryptopp552\GNUmakefile

open the Qt command prompt (I used that of the Qt SDK 2009.05)
input the following commands at the Qt command line:
c:
cd \cryptopp552
qmake -project

open the cryptopp552.pro (that is now created in C:\cryptopp552)
in it:
change TEMPLATE = app to TEMPLATE = lib
add a line containing LIBS += -lws2_32 at the end.

type the following commands at the Qt command line:
qmake
mingw32-make all

wait for the build process to finish (may take many minutes)

now we should have files named libcryptopp552.a and cryptopp552.dll in directories C:\cryptopp552\release and C:\cryptopp552\debug

copy the C:\cryptopp552\release\libcryptopp552.a to <Qt dir>\lib
note that there is another directory named lib one level higher in the Qt SDK installation dir. So don't confuse them please.
copy the C:\cryptopp552\release\cryptopp552.dll to <Qt dir>\bin
note that there is another directory named bin one level higher in the Qt SDK installation dir. So don't confuse them please.

create a directory named cryptopp in <Qt dir>\include.
copy all header (.h) files from the C:\cryptopp552 to <Qt dir>\include\cryptopp.

now we can test crypto++ and see how to use it in our Qt programs.

first example is a program that computes an MD5 hash (of a hard coded string):

main.cpp

#include <iostream>
 
#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif
#include <cryptopp/md5.h>
 
USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)
const int MAX_PHRASE_LENGTH=250;
 
int main(int argc, char *argv[]) {
 
CryptoPP::MD5 hash;
byte digest[ CryptoPP::MD5::DIGESTSIZE ];
std::string message = "Hello World!";
 
hash.CalculateDigest( digest, (const byte*)message.c_str(), message.length());
 
CryptoPP::HexEncoder encoder;
std::string output;
encoder.Attach( new CryptoPP::StringSink( output ) );
encoder.Put( digest, sizeof(digest) );
encoder.MessageEnd();
 
std::cout << "Input string: " << message << std::endl;
std::cout << "MD5: " << output << std::endl;
 
return 0;
}

#include <iostream>

#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif
#include <cryptopp/md5.h>

USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)
const int MAX_PHRASE_LENGTH=250;

int main(int argc, char *argv[]) {

CryptoPP::MD5 hash;
byte digest[ CryptoPP::MD5::DIGESTSIZE ];
std::string message = "Hello World!";

hash.CalculateDigest( digest, (const byte*)message.c_str(), message.length());

CryptoPP::HexEncoder encoder;
std::string output;
encoder.Attach( new CryptoPP::StringSink( output ) );
encoder.Put( digest, sizeof(digest) );
encoder.MessageEnd();

std::cout << "Input string: " << message << std::endl;
std::cout << "MD5: " << output << std::endl;

return 0;
}

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code from: http://www.cryptopp.com/wiki/Hash_Functions

remember that you should add these lines to its .pro file before starting to build it:
LIBS += -lcryptopp552
CONFIG+=console

the program should print these on the console window:
Input string: Hello World!
MD5: ED076287532E86365E841E92BFC50D8C

second example is a program that takes 3 arguments at the command line.
arguments are file names.
the program then prompts for a Passphrase and then stores an encrypted version of the first file in the second file and then stores the result of decrypting the second file in the third file.
sample command line I used: release\cryptopptest.exe 1.jpg 2.jpg 3.jpg

#include <iostream>
 
#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#include <cryptopp/default.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif
 
USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)
 
const int MAX_PHRASE_LENGTH=250;
 
void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);
void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);
 
 
int main(int argc, char *argv[])
{
   try
    {
       char passPhrase[MAX_PHRASE_LENGTH];
       cout << "Passphrase: ";
       cin.getline(passPhrase, MAX_PHRASE_LENGTH);
       EncryptFile(argv[1], argv[2], passPhrase);
       DecryptFile(argv[2], argv[3], passPhrase);
    }
    catch(CryptoPP::Exception &e)
    {
       cout << "\nCryptoPP::Exception caught: "
              << e.what() << endl;
       return -1;
    }
    catch(std::exception &e)
    {
       cout << "\nstd::exception caught: " << e.what() << endl;
       return -2;
    }
 }
 
 
void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true, new DefaultEncryptorWithMAC(passPhrase,
                   new FileSink(out)));
 }
 
void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true,
         new DefaultDecryptorWithMAC(passPhrase, new FileSink(out)));
 }
 
RandomPool & GlobalRNG()
 {
    static RandomPool randomPool;
    return randomPool;
 }
int (*AdhocTest)(int argc, char *argv[]) = NULL;

#include <iostream>

#define CRYPTOPP_DEFAULT_NO_DLL
#include <cryptopp/dll.h>
#include <cryptopp/default.h>
#ifdef CRYPTOPP_WIN32_AVAILABLE
#include <windows.h>
#endif

USING_NAMESPACE(CryptoPP)
USING_NAMESPACE(std)

const int MAX_PHRASE_LENGTH=250;

void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);
void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase);


int main(int argc, char *argv[])
{
   try
    {
       char passPhrase[MAX_PHRASE_LENGTH];
       cout << "Passphrase: ";
       cin.getline(passPhrase, MAX_PHRASE_LENGTH);
       EncryptFile(argv[1], argv[2], passPhrase);
       DecryptFile(argv[2], argv[3], passPhrase);
    }
    catch(CryptoPP::Exception &e)
    {
       cout << "\nCryptoPP::Exception caught: "
              << e.what() << endl;
       return -1;
    }
    catch(std::exception &e)
    {
       cout << "\nstd::exception caught: " << e.what() << endl;
       return -2;
    }
 }


void EncryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true, new DefaultEncryptorWithMAC(passPhrase,
                   new FileSink(out)));
 }

void DecryptFile(const char *in,
                    const char *out,
                    const char *passPhrase)
 {
    FileSource f(in, true,
         new DefaultDecryptorWithMAC(passPhrase, new FileSink(out)));
 }

RandomPool & GlobalRNG()
 {
    static RandomPool randomPool;
    return randomPool;
 }
int (*AdhocTest)(int argc, char *argv[]) = NULL;

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code from: http://www.codeguru.com/cpp/misc/mis...le.php/c11953/

remember that you should add these lines to its .pro file before starting to build it:
LIBS += -lcryptopp552
CONFIG+=console

--------------------------------

I appreciate your feedback.
good luck!

[FS Lover]

this is a function I wrote & tested for encrypting an in memory file stored in a QByteArray.
it takes a QByteArray and a passPhrase and then encrypts the contents of the QByteArray.
Crypto++ encryption class which it uses is DefaultEncryptorWithMAC and according to the reference doc it uses Password-Based Encryptor using DES-EDE2 and HMAC/SHA-1.

void encrypt(QByteArray &in_out, const char *passPhrase) {
 
string tmp;	
StringSource s((const byte *)in_out.constData(), in_out.size(), true, new DefaultEncryptorWithMAC(passPhrase, new StringSink(tmp)));
in_out.clear();
in_out.append(QByteArray(tmp.c_str(), tmp.size()));
 
}

void encrypt(QByteArray &in_out, const char *passPhrase) {

string tmp;	
StringSource s((const byte *)in_out.constData(), in_out.size(), true, new DefaultEncryptorWithMAC(passPhrase, new StringSink(tmp)));
in_out.clear();
in_out.append(QByteArray(tmp.c_str(), tmp.size()));
	
}

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for decrypting u simply need to a DefaultDecryptorWithMAC instead of the DefaultEncryptorWithMAC:

void decrypt(QByteArray &in_out, const char *passPhrase) {
 
string tmp;	
StringSource s((const byte *)in_out.constData(), in_out.size(), true, new DefaultDecryptorWithMAC(passPhrase, new StringSink(tmp)));
in_out.clear();
in_out.append(QByteArray(tmp.c_str(), tmp.size()));
 
}

void decrypt(QByteArray &in_out, const char *passPhrase) {

string tmp;	
StringSource s((const byte *)in_out.constData(), in_out.size(), true, new DefaultDecryptorWithMAC(passPhrase, new StringSink(tmp)));
in_out.clear();
in_out.append(QByteArray(tmp.c_str(), tmp.size()));
	
}

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I am new to Crypto++ (and to cryptography in general) and haven't read the entire crypto++'s reference; Any idea about a better code is welcome.

[FS Lover]

compiled (with mingw) Crypto++ lib and include files: http://www.4shared.com/file/24082421...mingw-bin.html (12 MB)

and another download with no debug lib included: http://www.4shared.com/file/24082839...n-nodebug.html (2.5 MB)

[Thà nh Viên Mới]

compiled (with mingw) Crypto++ lib and include files: http://www.4shared.com/file/24082421...mingw-bin.html (12 MB)

and another download with no debug lib included: http://www.4shared.com/file/24082839...n-nodebug.html (2.5 MB)

if i want use Vmac in Crypto Plus Plus On QT then how do i do ?

_http://www.cryptopp.com/docs/ref/class_v_m_a_c.html

[udit]

Man your tutorial is just what a newbie needs
else i would have been a goner


Thank you really from my heart

I love working in Qt , the only thing i Fell Qt lacks is real tutorials of using external plugins,library or dll's etc
But you really made my day today
thanks again

[tbscope]

the only thing i Fell Qt lacks is real tutorials of using external plugins,library or dll's etc

That's because this has almost nothing to do with Qt.

[FS Lover]

Crypto++ v5.5.1 Reference Manual: http://www.4shared.com/file/S5jvueo-...oPP551Ref.html

[the_jinx]

Thanks for all the help in this thread!
For all who might like, Crypto++ v 5.6.1 compiled on Windows 7 (32 bit) with the latest Qt 4.7 2010.05
http://jinx.etv.cx/media/cryptopp561-mingw32-qt47.zip (12.2 MB)

There might be a header or two too much in the includes etc, but they seem to be working.

[udit]

could you tell me waht would be the dependency when i run this program on different machine what parts of cryptolibrary need to be with the executable