C++ gets the file hash value of hash and the torrent of bt seed magnetic link hash value

  • 2020-04-02 02:02:29
  • OfStack


// 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;
}


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