CardQueryKeySizes function
This topic is not current. For the most current information about the Smart Card API, see Smart Card Minidriver Specification.
The CardQueryKeySizes function, defined by a smart card module, retrieves the public key lengths supported by a smart card.
Syntax
DWORD WINAPI CardQueryKeySizes(
_In_ PCARD_DATA pCardData,
_In_ DWORD dwKeySpec,
_In_ DWORD dwFlags,
_Out_ PCARD_KEY_SIZES pKeySizes
);
Parameters
-
pCardData [in]
-
A pointer to a CARD_DATA structure received from a call to the CardAcquireContext function.
-
dwKeySpec [in]
-
A DWORD value that specifies the type of the private key for which to find the length.
This parameter can be one of the following values.
Value Meaning - AT_KEYEXCHANGE
- 1
This function gets the sizes of keys that are used to encrypt and decrypt session keys. - AT_SIGNATURE
- 2
This function gets the sizes of keys that are used to create and verify digital signatures. -
dwFlags [in]
-
Reserved. This parameter must be set to zero.
-
pKeySizes [out]
-
A pointer to a CARD_KEY_SIZES structure that, on output, contains information about the sizes of private keys supported on the smart card.
Return value
If the function succeeds, the function returns zero.
If the function fails, it returns a nonzero value.
Requirements
| Minimum supported client |
Windows XP [desktop apps only] |
| Minimum supported server |
Windows Server 2003 [desktop apps only] |
| Header |
|