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CryptDestroyHash info  Overview  Group

The CryptDestroyHash function destroys the hash object referenced by the hHash parameter. Once a hash object has been destroyed, it can no longer be used and its handle is useless from then on.

All hash objects should be destroyed with the CryptDestroyHash function when the application is finished with them.

BOOL CRYPTFUNC CryptDestroyHash(




[in] A handle to the hash object to be destroyed.


When a hash object is destroyed, the many CSPs will scrub the memory in the CSP where the hash object was held. The CSP memory is then freed.

There should be a one-to-one correspondence between calls to CryptCreateHash and CryptDestroyHash.

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.




The hash object specified by hHash is currently being used by another process.


One of the parameters specifies an invalid handle.


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


The hHash handle specifies an algorithm that this CSP does not support.


The hash object specified by the hHash parameter is invalid.


The CSP context that was specified when the hash object was created cannot be found.


See the “Example” section in the CryptSignHash function.

See Also

CryptCreateHash, CryptHashData, CryptSignHash 

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