#include "CryptoPP/hex.h"
#include "CryptoPP/dll.h"
#include "CryptoPP/default.h"
#include "CryptoPP/md5.h"
#include "CryptoPP/hex.h"

.....

	String EncryptString(String &instr, String &passPhrase)
	{
		std::string outstr;
	
		CryptoPP::DefaultEncryptorWithMAC encryptor(passPhrase, new CryptoPP::HexEncoder(new CryptoPP::StringSink(outstr)));
		encryptor.Put((byte *)instr.Begin(), instr.GetLength());
		encryptor.MessageEnd();
	
		return outstr;
	}
	
	String DecryptString(String &instr, String &passPhrase)
	{
		std::string outstr;
	
		CryptoPP::HexDecoder decryptor(new CryptoPP::DefaultDecryptorWithMAC(passPhrase, new CryptoPP::StringSink(outstr)));
		decryptor.Put((byte *)instr.Begin(), instr.GetLength());
		decryptor.MessageEnd();
	
		return outstr;
	}