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FreeCryptProvFromCertEx function

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.

Syntax


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
);

Parameters

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.

dwKeySpec

The address of a DWORD variable that receives additional information about the key. This can be one of the following values.

ValueMeaning
AT_KEYEXCHANGE

The key pair is a key exchange pair.

AT_SIGNATURE

The key pair is a signature pair.

CERT_NCRYPT_KEY_SPEC

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.

Return value

This function does not return a value.

Requirements

Minimum supported client

Windows 7 [desktop apps only]

Minimum supported server

Windows Server 2008 R2 [desktop apps only]

DLL

Mssign32.dll

 

 

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