I tried the following: https://stackoverflow.com/a/31012627/1006821

but the conversion of wstringDevicelocking is just extremely confusing. I have never used STL so the begin and end. I am guessing they are iterators.

Any help would be useful, Thanks.

string AuthFile::EncrptedFileName(std::string& userName, std::string& orgName,string& strDeviceLocking)
{ 
  string result;
  string hashVairable = "#" ;
  string hashValue(hashVairable + orgName + hashVairable + "::" + hashVairable + userName + hashVairable);

std::wstring wstringDevicelocking(strDeviceLocking.length(), L' ');
std::copy(strDeviceLocking.begin(), strDeviceLocking.end(), wstringDevicelocking.begin());
wstring guid = L"258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
std::string keyaccesStr(hashValue);
wstring keyaccessGuid(keyaccesStr.begin(), keyaccesStr.end());
keyaccessGuid.append(guid);
keyaccessGuid.append(wstringDevicelocking);
string utf8String = wstring_to_utf8(keyaccessGuid);

	 unsigned char digestStr2[SHA_DIGEST_LENGTH];
	 SHA1((unsigned char*)utf8String.c_str(), strlen(utf8String.c_str()), (unsigned char*)&digestStr2);
	 char* utf8StrSha1Base64 = convertToBase64(digestStr2, SHA_DIGEST_LENGTH);
	 string sha1DataStr(utf8StrSha1Base64);

     //Remove all characters except alphabets
     removeForbiddenChar(&sha1DataStr);

     result = sha1DataStr;

	 //printf("\n result [%s] \n", result.c_str());

     return result;
}


void AuthFile::removeForbiddenChar(string *s)
{
    string::iterator it;

    for (it = s->begin(); it < s->end(); ++it){
        switch (*it){
        case '/':case '\\':case ':':case '?':case '"':case '<':case '>':case '|':case '=':
            *it = 'B';
        }
    }

}