CryptCATAdminCalcHashFromFileHandle function (mscat.h)

[The CryptCATAdminCalcHashFromFileHandle function is available for use in the operating systems specified in the Requirements section. It may be altered or unavailable in subsequent versions.]

The CryptCATAdminCalcHashFromFileHandle function calculates the hash for a file. This function has no associated import library. You must use the LoadLibrary and GetProcAddress functions to dynamically link to Wintrust.dll.

Syntax

BOOL CryptCATAdminCalcHashFromFileHandle(
  [in]      HANDLE hFile,
  [in, out] DWORD  *pcbHash,
  [in]      BYTE   *pbHash,
  [in]      DWORD  dwFlags
);

Parameters

[in] hFile

A handle to the file whose hash is being calculated. This parameter cannot be NULL and must be a valid file handle.

[in, out] pcbHash

A pointer to a DWORD variable that contains the number of bytes in pbHash. Upon input, set pcbHash to the number of bytes allocated for pbHash. Upon return, pcbHash contains the number of returned bytes in pbHash. If pbHash is passed as NULL, then pcbHash contains the number of bytes to allocate for pbHash.

[in] pbHash

A pointer to a BYTE buffer that receives the hash. If this parameter is passed in as NULL, then pcbHash contains the number of bytes to allocate for pbHash, and a subsequent call can be made to retrieve the hash.

[in] dwFlags

This parameter is reserved for future use and must be set to zero.

Return value

The return value is TRUE if the function succeeds; FALSE if the function fails. If FALSE is returned, call the GetLastError function to determine the reason for failure. If not enough memory has been allocated for pbHash, the CryptCATAdminCalcHashFromFileHandle function will set the last error to ERROR_INSUFFICIENT_BUFFER.

Requirements