Hex Encoder and Decoder using Crypto++

std::string encoded;
CryptoPP::HexEncoder encoder( new CryptoPP::StringSink( encoded ),
    true /* Uppercase */, 2 /* Grouping */, ":" /* Separator */ );
encoder.Put( signature, dwLen );
encoder.MessageEnd();

// HexEnDn.cpp
//

#include "stdafx.h"
#include <hex.h>

void display(byte * pData, size_t length)
{
	byte * pTemp = pData;
	while(length--)
	{
		std::cout << *pTemp;
		pTemp++;
	}
}
void HexTest(void)
{
	//pData
	byte pData[] = {1,2,'d','e','f','g'};
	size_t dwLen = sizeof(pData);

	//dump pData
	display(pData,dwLen);
	std::cout << std::endl;

	//Encode
	byte * pData2 = (byte *)malloc(sizeof(byte)*dwLen*2);
	CryptoPP::HexEncoder hexEncoder;
	hexEncoder.Put(pData,dwLen);
	hexEncoder.MessageEnd();
	hexEncoder.Get(pData2,dwLen*2);

	//dump
	display(pData2,dwLen*2);
	std::cout << std::endl;

	//Decode
	byte * pData3 = (byte *)malloc(sizeof(byte)*dwLen);
	CryptoPP::HexDecoder hexDecoder;
	hexDecoder.Put(pData2,dwLen*2);
	hexDecoder.Get(pData3,dwLen);
	hexDecoder.MessageEnd();

	//dump
	display(pData3,dwLen);
	std::cout << std::endl;

	//clean
	free(pData2);
	free(pData3);
}
void HexTest2(void)
{
    byte signature[] = {1,2,'d','e','f','g'};
    size_t dwLen = sizeof(signature);
    ///////////////////////////////////////
    // Signature Hex Encoding
    std::string encoded;
    CryptoPP::HexEncoder encoder( new CryptoPP::StringSink( encoded ),
        true /* Uppercase */, 2 /* Grouping */, ":" /* Separator */ );
    encoder.Put( signature, dwLen );
    encoder.MessageEnd();

    ///////////////////////////////////////
    // Dump
    std::cout << "Signature:" << std::endl;
    std::cout << " " << encoded << std::endl;
    std::cout << std::endl;
}
int main(int argc, char * argv[])
{
	HexTest();
	std::cout << std::endl;
	HexTest2();
	return 0;
}