- 1 year ago
Windows C++ crypto API: how to disable pin code UI for smart card
To disable the PIN code UI prompt for a smart card when using the Windows Crypto API in C++, you can set the CRYPT_SILENT
flag when acquiring a handle to the smart card's cryptographic provider.
Here's an example of how you can achieve this using the Crypto API functions:
cpp#include <windows.h>
#include <wincrypt.h>
int main()
{
// Acquire a handle to the smart card's cryptographic provider
HCRYPTPROV hProv = 0;
DWORD dwFlags = CRYPT_SILENT; // Set CRYPT_SILENT flag to disable PIN code UI
if (!CryptAcquireContext(&hProv, NULL, MS_SCARD_PROV, PROV_RSA_FULL, dwFlags))
{
// Handle error
DWORD errorCode = GetLastError();
// ...
return 1;
}
// Use the cryptographic provider handle for desired operations
// ...
// Release the handle to the cryptographic provider
if (hProv)
{
CryptReleaseContext(hProv, 0);
hProv = 0;
}
return 0;
}
In this example, the CryptAcquireContext
function is called to acquire a handle to the smart card's cryptographic provider. The dwFlags
parameter is set to CRYPT_SILENT
, which disables the PIN code UI. Make sure to replace MS_SCARD_PROV
with the appropriate provider name for your smart card.
By setting the CRYPT_SILENT
flag, the system attempts to acquire the smart card's provider without displaying any UI prompts for the PIN code. However, keep in mind that the behavior may vary depending on the smart card driver and the specific configuration of the system.
Remember to handle any errors that may occur during the use of the Crypto API functions, as shown in the example above.