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CryptSetProvParam info  Overview  Group

The CryptSetProvParam function lets applications customize the operations of a CSP.



    DWORD dwParam,

    BYTE *pbData,

    DWORD dwFlags



[in] A handle to the CSP on which to set parameters.
[in] The parameter number to set.

When this parameter is set to PP_CLIENT_HWND, the pbData buffer should contain a DWORD value specifiying the window handle that the provider is to use when interacting directly with the user. When setting this parameter, applications should call the CryptSetProvParam function before calling CryptAcquireContext. This is necessary because many CSPs will display a user interface during the CryptAcquireContext function. Note that CSPs that do not ever display a user interface will ignore the value of this parameter.

[in] The parameter data buffer. Place the parameter data in this buffer before calling CryptSetProvParam. The form of this data will vary, depending on the parameter number.
[in] The flag values. This parameter is reserved for future use and should always be zero.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero. To retrieve extended error information, use the GetLastError function.

The following table lists the error codes most commonly returned by the GetLastError function. The error codes prefaced by “NTE” are generated by the particular CSP you are using.




One of the parameters specifies an invalid handle.


The CSP context is currently being used by another process.


One of the parameters contains an invalid value. This is most often an illegal pointer.


The dwFlags parameter is nonzero or the pbData buffer contains an invalid value.


The dwParam parameter specifies an unknown parameter.


The CSP context that was specified when the hKey key was created cannot be found.


The function failed in some unexpected way.

See Also

CryptAcquireContext, CryptGetProvParam, CryptSetKeyParam 

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