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ITsVISTA KB-Link: KB974971

Error message when you use the CryptAcquireContext function to request a handle to a third-party CSP on a computer that is running Windows Vista or Windows Server 2008: “0x800b0100 (Invalid Signature)”

Consider the following scenario:

  • You have a multiprocessor computer that is running Windows Vista or Windows Server 2008.
  • You try to use the CryptAcquireContext function to request a handle to a third-party cryptographic service provider (CSP).

In this scenario, the function may generate the following error message:

0x800b0100 (Invalid Signature)

Note: Because a CSP from Microsoft is signed by using a different signing method, this problem does not occur if the CSP is a software-based CSP from Microsoft.

There is a download that resolves this issue. See Hotfixes for details.
32-bit Download: Contact Microsoft
64-Bit Download: Contact Microsoft

For more information on this issue, including potential causes, workarounds, and resolutions, see: Microsoft KB Article KB974971.

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