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CryptGetUserKey The CryptGetUserKey function retrieves a handle to a permanent user key pair, such as the user’s signature key pair.
VB4-32,5,6
Declare Function CryptGetUserKey Lib "advapi32.dll" (ByVal hProv As Long, ByVal dwKeySpec As Long, phUserKey As Long) As Long |
VB.NET
System.Security.Cryptography.* |
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Operating Systems Supported |
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Windows NT 4.0 or later; Windows 95 OSR2 or later (or Windows 95 with Internet Explorer 3.02 or later) |
- hProv
[in] A handle to the application’s CSP. An application obtains this handle using the CryptAcquireContext function.
- dwKeySpec
[in] The specification of the key to retrieve. The following keys are retrievable from almost all providers:
- AT_KEYEXCHANGE ¾ Exchange public key
- AT_SIGNATURE ¾ Signature public key
Additionally, some providers allow access to other user specific keys through this function. See the documentation on the specific provider for details.
- phUserKey
[out] The address that the function copies the handle of the retrieved key to. |
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.
ERROR_INVALID_HANDLE
One of the parameters specifies an invalid handle.
ERROR_INVALID_PARAMETER
One of the parameters contains an invalid value. This is most often an illegal pointer.
NTE_BAD_KEY
The dwKeySpec parameter contains an invalid value.
NTE_BAD_UID
The hProv parameter does not contain a valid context handle.
NTE_NO_KEY
The key requested by the dwKeySpec parameter does not exist. |
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