HRESULT DecryptConnectionString(const BYTE* pCipherText, DWORD cbCipherText, BYTE** ppPlainText) NCRYPT_PROV_HANDLE hProvider = NULL; NCRYPT_KEY_HANDLE hKey = NULL; HRESULT hr = E_FAIL; // 1. Open a NEW, isolated storage provider SECURITY_STATUS ss = NCryptOpenStorageProvider(&hProvider, L"MyCustomHSMProvider", NCRYPT_SILENT_FLAG); if (ss != ERROR_SUCCESS) return HRESULT_FROM_NT(ss);

SECURITY_STATUS OpenNewProvider(NCRYPT_PROV_HANDLE *phProvider) // Using NCRYPT_SILENT_FLAG ensures we don't inherit a dialog-based cache. // For a truly "New" specific context, many developers also combine this with // NCRYPT_MACHINE_KEY_FLAG to open a isolated machine store context. return NCryptOpenStorageProvider( phProvider, MS_KEY_STORAGE_PROVIDER, NCRYPT_SILENT_FLAG int main() NCRYPT_PROV_HANDLE hProvider = NULL; SECURITY_STATUS status = OpenNewProvider(&hProvider); if (status == ERROR_SUCCESS) printf("Successfully opened a NEW provider context.\n"); // Perform key generation or storage operations here... // e.g., NCryptCreatePersistedKey(hProvider, ...); // Critical: Close the handle to avoid memory leaks. NCryptFreeObject(hProvider); else printf("Failed with error: 0x%08x\n", status);

For every Open (or New ), there must be exactly one NCryptFreeObject .

// 3. Decrypt using the isolated key DWORD dwResult = 0; ss = NCryptDecrypt(hKey, pCipherText, cbCipherText, NULL, NULL, 0, &dwResult, NCRYPT_SILENT_FLAG); // ... allocate buffer and decrypt ...

In the ever-evolving landscape of cybersecurity and data management, the ability to programmatically access and manage encrypted storage is no longer a luxury—it is a necessity. For developers working with the Ncrypt library (a common cryptographic interface in enterprise environments, often associated with the Windows Cryptography API: Next Generation - CNG), one command stands at the threshold of secure data handling: NcryptOpenStorageProvider New .