The FreeCryptProvFromCertEx function releases the handle either to a cryptographic service provider (CSP) or to a Cryptography API: Next Generation (CNG) key.
Note This function has no associated header file or import library. To call this function, you must create a user-defined header file and use the LoadLibrary and GetProcAddress functions to dynamically link to Mssign32.dll.
void WINAPI FreeCryptProvFromCertEx( _In_ BOOL fAcquired, _In_ HCRYPTPROV_OR_NCRYPT_KEY_HANDLE hProv, DWORD dwKeySpec, _In_opt_ LPWSTR pwszCapiProvider, _In_ DWORD dwProviderType, _In_opt_ LPWSTR pwszTmpContainer );
- fAcquired [in]
A value that specifies whether the provider handle was acquired from the certificate.
- hProv [in]
A handle to a CAPICOM CSP or a handle to a CNG key.
The address of a DWORD variable that receives additional information about the key. This can be one of the following values.
The key pair is a key exchange pair.
The key pair is a signature pair.
The key is a CNG key.
Windows Server 2003 and Windows XP: This value is not supported.
- pwszCapiProvider [in, optional]
A pointer to a null-terminated string for the provider name.
- dwProviderType [in]
Specifies the CSP type. This can be zero or one of the Cryptographic Provider Types. If this member is zero, the key container is one of the CNG key storage providers.
- pwszTmpContainer [in, optional]
A pointer to a null-terminated string for the name of the temporary key container.
This function does not return a value.
Minimum supported client
|Windows 7 [desktop apps only]|
Minimum supported server
|Windows Server 2008 R2 [desktop apps only]|