IX509CertificateRequestPkcs10::GetCspStatuses method (certenroll.h)
The GetCspStatuses method retrieves an ICspStatuses collection that contains all provider/algorithm pairs consistent with the intended use of the private key as specified by the caller.
HRESULT GetCspStatuses( X509KeySpec KeySpec, ICspStatuses **ppCspStatuses );
An X509KeySpec enumeration value that specifies the intended use of the key. This can be one of the following values.
||Only Cryptography API: Next Generation (CNG) providers are selected.|
||Only CryptoAPI cryptographic service providers (CSPs) with encryption algorithms (including key exchange) are selected.|
||Only CryptoAPI CSPs with signature algorithms are selected.|
Address of a variable that receives a pointer to an ICspStatuses interface that represents the collection.
If the function succeeds, the function returns S_OK.
If the function fails, it returns an HRESULT value that indicates the error. Possible values include, but are not limited to, those in the following table. For a list of common error codes, see Common HRESULT Values.
||The private key cannot be found.|
||The object is not initialized.|
This method retrieves a collection of ICspStatus objects. Each object represents a single provider/algorithm pair. If you specify a template when initializing the IX509CertificateRequestPkcs10 request object, template attributes such as the pKIDefaultCSPs and pKIDefaultKeySpec affect which pairs are initially enabled. You can call the following properties on each ICspStatus object to retrieve information about a pair:
- The CspInformation property retrieves provider information.
- The CspAlgorithm property retrieves algorithm information.
- The EnrollmentStatus property retrieves an IX509EnrollmentStatus object. Call the Selected property on the status object to determine whether the provider/algorithm pair is enabled for this request.
- The Ordinal property retrieves the position in the provider/algorithm pair collection.
The collection retrieved by this method is saved internally on the request object. Up to three collections, one for each KeySpec value, can be created and saved. This is done to preserve the selection state of the provider/algorithm pairs so that relevant property pages can be displayed accurately and quickly multiple times and so that the Encode method can identify which providers and algorithms are selected if a private key must be created. If the selection state of a provider/algorithm pair is modified, the changes are saved to the appropriate collection. Changes made to the members of one collection do not affect the members of any other collection. The collections exist as long as the PKCS #10 object continues to exist.
Assume, for example, that this method is called with the KeySpec parameter set to XCN_AT_SIGNATURE and that a template is used to initialize the request. The following statements will be true:
- A collection of ICspStatus objects is created and saved on the IX509CertificateRequestPkcs10 object. The collection contains all valid provider/algorithm pairs installed on the computer.
- Because the KeySpec parameter is not set to XCN_AT_NONE, the Selected property is set to SelectedNo for each Cryptography API: Next Generation (CNG) provider/algorithm pair in the collection.
- Because the KeySpec parameter is not set to XCN_AT_KEYEXCHANGE, the Selected property is set to SelectedNo for each CryptoAPI CSP/algorithm pair in the collection where the algorithm can be used to encrypt data or archive a key.
- For each provider referenced by the template or private key but not supported on the computer, a placeholder ICspStatus object is created and added to the collection and the Selected property is set to SelectedNo.
- The Selected property is set to SelectedYes for each CryptoAPI CSP/algorithm pair where the algorithm can be used only to sign data.
- The Ordinal property is set to reflect the CSP order, if any, identified by the pKIDefaultCSPs template attribute. The CSPs listed first by the attribute are ordered first in the collection. This property is used during enrollment if a private key must be created. The first selected CSP/algorithm pair is used to create the key, but if the operation fails, the next selected pair is tried.
- Calling this method again with the same KeySpec parameter retrieves a pointer to the existing collection created previously for that parameter value.
- Calling this method again with a different KeySpec parameter will not affect the collection created for the XCN_AT_SIGNATURE KeySpec value. Further, changing the Selected property on any member of the new collection does not affect any member of the previous collection.
The GetCspStatuses method differs from the CspStatuses property by use of the KeySpec parameter. The method allows users to specify this value, but the property uses the value set on the private key associated with the request object.
You must initialize the IX509CertificateRequestPkcs10 object before calling this method. For more information, see any of the following methods:
|Minimum supported client||Windows Vista [desktop apps only]|
|Minimum supported server||Windows Server 2008 [desktop apps only]|