// CHash.h : header file

#pragma once

#include "sha1.h"

#define        SIZE_OF_BUFFER         16000

class CHash

{

// Construction

public:

    CString SHA1Hash(CString strHashFile);

};

// CHash.cpp : implementation file

//

#include "stdafx.h"

#include "CHash.h"

#include <atlconv.h>

CString CHash::SHA1Hash(CString strHashFile)

{

    USES_CONVERSION;

    FILE *fileToHash = NULL;

    unsigned long lenRead = 0;

    unsigned char fileBuf[SIZE_OF_BUFFER];

    sha1_ctx m_sha1;

    unsigned char* tempOut = new unsigned char[256];

    CString    tempHash;

    CString outHash;

    sha1_begin(&m_sha1);

    fileToHash = fopen(T2A(strHashFile), "rb");

    do

    {

        lenRead = fread(fileBuf, 1, SIZE_OF_BUFFER, fileToHash);

        if(lenRead != 0)

        {

            sha1_hash(fileBuf, lenRead, &m_sha1);

        }

    } while (lenRead == SIZE_OF_BUFFER);

    fclose(fileToHash); fileToHash = NULL;

    sha1_end(tempOut, &m_sha1);

    for (int i = 0 ; i < 20 ; i++)

    {

        char tmp[3];

        _itoa(tempOut[i], tmp, 16);

        if (strlen(tmp) == 1)

        {

            tmp[1] = tmp[0];

            tmp[0] = '0';

            tmp[2] = '\0';

        }

        tempHash += tmp;    

    }

    delete[] tempOut;

    outHash = tempHash;

    return outHash;

}