CryptEnumProviders Example

#pragma comment(lib, "crypt32.lib")

#include <stdio.h>
#include <tchar.h>
#include <windows.h>
#include <wincrypt.h>
#include <iostream>

void MyHandleError(TCHAR* s);
void Wait(TCHAR* s);

int _tmain(int argc, _TCHAR* argv[])
{
    // Declare and initialize variables.
    LPTSTR pszName;
    DWORD dwType;
    DWORD cbName;
    DWORD dwIndex = 0;
    LPTSTR pbProvName;
    DWORD cbProvName;

    //--------------------------------------------------------------
    // Print header lines for providers.
    _tprintf(TEXT("\n\nListing Available Providers.\n"));
    _tprintf(TEXT("Provider type    Provider Name\n"));
    _tprintf(TEXT("_____________    ")
        TEXT("_____________________________________\n"));

    //---------------------------------------------------------------
    // Loop through enumerating providers.
    dwIndex = 0;
    while (CryptEnumProviders(
        dwIndex,
        nullptr,
        0,
        &dwType,
        nullptr,
        &cbName))
    {
        //-----------------------------------------------------------
        // cbName is the length of the name of the next provider.
        // Allocate memory in a buffer to retrieve that name.
        if (!(pszName = static_cast<LPTSTR>(LocalAlloc(LMEM_ZEROINIT, cbName))))
        {
            //MyHandleError(TEXT("ERROR - LocalAlloc failed!"));
            _tprintf(TEXT("ccc.\n"));
        }

        //-----------------------------------------------------------
        // Get the provider name.
        if (CryptEnumProviders(
            dwIndex++,
            nullptr,
            0,
            &dwType,
            pszName,
            &cbName))
        {
            /* _tprintf(TEXT("     %4.0d        %s\n"),
                 dwType,
                 pszName);*/
            std::wcout << dwType << " " << pszName << "\n";
        }
        else
        {
            ///MyHandleError(TEXT("ERROR - CryptEnumProviders"));
            _tprintf(TEXT("ddd.\n"));
        }

        LocalFree(pszName);
    } // End while loop.

    //---------------------------------------------------------------
    // Get the name of the default CSP specified for the
    // PROV_RSA_FULL type for the computer.
} // End main.


void MyHandleError(TCHAR* s)
{
    _tprintf(TEXT("An error occurred in running the program.\n"));
    _tprintf(TEXT("%s\n"), s);
    _tprintf(TEXT("Error number %x\n."), GetLastError());
    _tprintf(TEXT("Program terminating.\n"));
    exit(1);
}

void Wait(TCHAR* s)
{
    char x;
    _tprintf(s);
    x = getchar();
}