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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.
Compiling cryptlib.lib
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:
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C:\Users\mantvydas\Desktop\cryptopp\x64\Output\Release\cryptlib.lib
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Including cryptlib.lib in a Project
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
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// code copy pasted from here https://www.cryptopp.com/w/images/b/bd/AES-CBC-Filter.zip
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// crypto.cpp : This file contains the 'main' function. Program execution begins and ends there.
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//
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​
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#include "pch.h"
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#include <iostream>
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#include "aes.h"
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#include <Windows.h>
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​
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#include "osrng.h"
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using CryptoPP::AutoSeededRandomPool;
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​
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#include <iostream>
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using std::cout;
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using std::cerr;
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using std::endl;
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​
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#include <string>
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using std::string;
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​
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#include <cstdlib>
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using std::exit;
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​
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#include "cryptlib.h"
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using CryptoPP::Exception;
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​
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#include "hex.h"
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using CryptoPP::HexEncoder;
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using CryptoPP::HexDecoder;
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​
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#include "filters.h"
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using CryptoPP::StringSink;
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using CryptoPP::StringSource;
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using CryptoPP::StreamTransformationFilter;
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​
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#include "aes.h"
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using CryptoPP::AES;
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​
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#include "ccm.h"
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using CryptoPP::CBC_Mode;
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​
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#include "assert.h"
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​
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int main(int argc, char* argv[])
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{
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AutoSeededRandomPool prng;
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​
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byte key[AES::DEFAULT_KEYLENGTH];
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prng.GenerateBlock(key, sizeof(key));
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​
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byte iv[AES::BLOCKSIZE];
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prng.GenerateBlock(iv, sizeof(iv));
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​
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string plain = "CBC Mode Test";
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string cipher, encoded, recovered;
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​
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/*********************************\
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\*********************************/
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​
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// Pretty print key
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encoded.clear();
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StringSource(key, sizeof(key), true,
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new HexEncoder(
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new StringSink(encoded)
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) // HexEncoder
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); // StringSource
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cout << "key: " << encoded << endl;
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​
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// Pretty print iv
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encoded.clear();
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StringSource(iv, sizeof(iv), true,
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new HexEncoder(
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new StringSink(encoded)
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) // HexEncoder
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); // StringSource
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cout << "iv: " << encoded << endl;
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​
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/*********************************\
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\*********************************/
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​
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try
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{
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cout << "plain text: " << plain << endl;
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​
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CBC_Mode< AES >::Encryption e;
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e.SetKeyWithIV(key, sizeof(key), iv);
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​
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// The StreamTransformationFilter removes
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// padding as required.
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StringSource s(plain, true,
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new StreamTransformationFilter(e,
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new StringSink(cipher)
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) // StreamTransformationFilter
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); // StringSource
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​
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#if 0
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StreamTransformationFilter filter(e);
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filter.Put((const byte*)plain.data(), plain.size());
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filter.MessageEnd();
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​
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const size_t ret = filter.MaxRetrievable();
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cipher.resize(ret);
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filter.Get((byte*)cipher.data(), cipher.size());
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#endif
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}
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catch (const CryptoPP::Exception& e)
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{
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cerr << e.what() << endl;
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exit(1);
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}
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​
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/*********************************\
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\*********************************/
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​
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// Pretty print
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encoded.clear();
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StringSource(cipher, true,
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new HexEncoder(
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new StringSink(encoded)
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) // HexEncoder
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); // StringSource
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cout << "cipher text: " << encoded << endl;
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​
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/*********************************\
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\*********************************/
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​
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try
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{
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CBC_Mode< AES >::Decryption d;
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d.SetKeyWithIV(key, sizeof(key), iv);
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​
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// The StreamTransformationFilter removes
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// padding as required.
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StringSource s(cipher, true,
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new StreamTransformationFilter(d,
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new StringSink(recovered)
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) // StreamTransformationFilter
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); // StringSource
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​
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#if 0
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StreamTransformationFilter filter(d);
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filter.Put((const byte*)cipher.data(), cipher.size());
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filter.MessageEnd();
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​
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const size_t ret = filter.MaxRetrievable();
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recovered.resize(ret);
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filter.Get((byte*)recovered.data(), recovered.size());
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#endif
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​
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cout << "recovered text: " << recovered << endl;
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}
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catch (const CryptoPP::Exception& e)
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{
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cerr << e.what() << endl;
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exit(1);
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}
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​
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/*********************************\
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\*********************************/
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​
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return 0;
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}
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References
https://www.cryptopp.com/w/images/b/bd/AES-CBC-Filter.zip
Link errors using cryptopp on VS2012 static library, console application and clr program
Stack Overflow
Crypto++ Library 8.6 | Free C++ Class Library of Cryptographic Schemes
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