Article ID: 2513526 - Last Review: March 24, 2011 - Revision: 1.0

CryptSetProvider function or CryptSetProviderEx fails to change the user’s default cryptographic service provider (CSP).

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SYMPTOMS

When you try to change the user’s default cryptographic service provider (CSP) by calling the CryptSetProvider function or CryptSetProviderEx function with dwFlags set to CRYPT_USER_DEFAULT on the Microsoft products listed in the "Applies to" section, this results in the ERROR_CALL_NOT_IMPLEMENTED error.
This is by design.

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CAUSE

The call to the CryptSetProvider or CryptSetProviderEx function does not succeed when a CSP specified to the function is different from the default CSP. This error occurs because the operating system does not let you to change the default cryptographic service provider (CSP).

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RESOLUTION

To use a CSP that is different from the default one, specify the CSP to the pszProvider parameter of the CryptAcquireContext function.

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MORE INFORMATION

For more information about the CryptSetProvider function and CryptSetProviderEx function, visit the following Microsoft Web site:

CryptSetProvider Function
http://msdn.microsoft.com/en-us/library/aa380274(VS.85).aspx (http://msdn.microsoft.com/en-us/library/aa380274(VS.85).aspx)

CryptSetProviderEx Function
http://msdn.microsoft.com/en-us/library/aa380275(VS.85).aspx (http://msdn.microsoft.com/en-us/library/aa380275(VS.85).aspx)

For additional information regarding Windows Server 2003, click the following article number to view the article in the Microsoft Knowledge Base:

A call to the CryptSetProvider function does not succeed on Windows Server 2003-based computer
http://support.microsoft.com/kb/840694/en-us (http://support.microsoft.com/kb/840694/en-us)

The default CSP for the operating system that you are using can be found by calling the CryptGetDefaultProvider function:

CryptGetDefaultProvider Function
http://msdn.microsoft.com/en-us/library/aa379945(VS.85).aspx (http://msdn.microsoft.com/en-us/library/aa379945(VS.85).aspx)

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Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use (http://go.microsoft.com/fwlink/?LinkId=151500) for other considerations.

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