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AES Encryption Using Crypto++ .lib in Visual Studio C++
This is a quick note showing how to compile, link and include a Crypto++ static library (cryptlib.lib), compile and execute a sample code that uses AES CBC to encrypt and decrypt some string data.
Open the crypto++ solution file cryptest.sln:
Change cryptlib project runtime library to
Multi-threaded and change configuration to Release x64:
Build cryptlib project. It will spit out a cryptlib.lib static library:
C:\Users\mantvydas\Desktop\cryptopp\x64\Output\Release\cryptlib.lib
Create a new VS project and include cryptlib.lib that you've just compiled:
Change project's runtime library to Multi-threaded - it has to use the same runtime library as cryptlib.lib:
Copy over all the header files from the crypto++ project to your project's folder like so:
Include those headers in the project by adding the folder to
Include Directories list:
Copy over the below sample code to your main .cpp file and compile:
crypto.cpp
// code copy pasted from here https://www.cryptopp.com/w/images/b/bd/AES-CBC-Filter.zip
// crypto.cpp : This file contains the 'main' function. Program execution begins and ends there.
//
#include "pch.h"
#include <iostream>
#include "aes.h"
#include <Windows.h>
#include "osrng.h"
using CryptoPP::AutoSeededRandomPool;
#include <iostream>
using std::cout;
using std::cerr;
using std::endl;
#include <string>
using std::string;
#include <cstdlib>
using std::exit;
#include "cryptlib.h"
using CryptoPP::Exception;
#include "hex.h"
using CryptoPP::HexEncoder;
using CryptoPP::HexDecoder;
#include "filters.h"
using CryptoPP::StringSink;
using CryptoPP::StringSource;
using CryptoPP::StreamTransformationFilter;
#include "aes.h"
using CryptoPP::AES;
#include "ccm.h"
using CryptoPP::CBC_Mode;
#include "assert.h"
int main(int argc, char* argv[])
{
AutoSeededRandomPool prng;
byte key[AES::DEFAULT_KEYLENGTH];
prng.GenerateBlock(key, sizeof(key));
byte iv[AES::BLOCKSIZE];
prng.GenerateBlock(iv, sizeof(iv));
string plain = "CBC Mode Test";
string cipher, encoded, recovered;
/*********************************\
\*********************************/
// Pretty print key
encoded.clear();
StringSource(key, sizeof(key), true,
new HexEncoder(
new StringSink(encoded)
) // HexEncoder
); // StringSource
cout << "key: " << encoded << endl;
// Pretty print iv
encoded.clear();
StringSource(iv, sizeof(iv), true,
new HexEncoder(
new StringSink(encoded)
) // HexEncoder
); // StringSource
cout << "iv: " << encoded << endl;
/*********************************\
\*********************************/
try
{
cout << "plain text: " << plain << endl;
CBC_Mode< AES >::Encryption e;
e.SetKeyWithIV(key, sizeof(key), iv);
// The StreamTransformationFilter removes
// padding as required.
StringSource s(plain, true,
new StreamTransformationFilter(e,
new StringSink(cipher)
) // StreamTransformationFilter
); // StringSource
#if 0
StreamTransformationFilter filter(e);
filter.Put((const byte*)plain.data(), plain.size());
filter.MessageEnd();
const size_t ret = filter.MaxRetrievable();
cipher.resize(ret);
filter.Get((byte*)cipher.data(), cipher.size());
#endif
}
catch (const CryptoPP::Exception& e)
{
cerr << e.what() << endl;
exit(1);
}
/*********************************\
\*********************************/
// Pretty print
encoded.clear();
StringSource(cipher, true,
new HexEncoder(
new StringSink(encoded)
) // HexEncoder
); // StringSource
cout << "cipher text: " << encoded << endl;
/*********************************\
\*********************************/
try
{
CBC_Mode< AES >::Decryption d;
d.SetKeyWithIV(key, sizeof(key), iv);
// The StreamTransformationFilter removes
// padding as required.
StringSource s(cipher, true,
new StreamTransformationFilter(d,
new StringSink(recovered)
) // StreamTransformationFilter
); // StringSource
#if 0
StreamTransformationFilter filter(d);
filter.Put((const byte*)cipher.data(), cipher.size());
filter.MessageEnd();
const size_t ret = filter.MaxRetrievable();
recovered.resize(ret);
filter.Get((byte*)recovered.data(), recovered.size());
#endif
cout << "recovered text: " << recovered << endl;
}
catch (const CryptoPP::Exception& e)
{
cerr << e.what() << endl;
exit(1);
}
/*********************************\
\*********************************/
return 0;
}
Success:
