To use a smart card container, first instantiate a smart card container. When a smart card container is instantiated, it registers with the smart card subsystem. Next, an application calls the smart card container's CreateInstance function. The smart card container creates a CSP or KSP interface, and registers it with the smart card subsystem.
For each smart card container, there is one corresponding CreateInstance function, and the container is registered with the smart card subsystem. This makes it possible for a smart card container to be used by multiple applications without requiring multiple calls to the smart card subsystem.
When an application uses a smart card container, it must be registered before the smart card container can be used. For more information on registering a smart card container, see IEnumWinsCardContainers . To check whether a smart card container is installed, call the
The smart card subsystem does not call the CSP or KSP interfaces. Instead, it calls the CSP or KSP interfaces from the smart card container. This allows an application to use a single interface to access CSPs or KSPs on multiple smart cards.
For each CSP, there is one corresponding IEnumWinsCardClasses interface, and there is one corresponding IEnumWinsCardContainers interface. When the smart card subsystem receives a CreateInstance request for a CSP, the container is checked to see whether it is installed. If the container is not installed, the smart card subsystem returns a WINCREATE_E_CLASSNOTREGISTERED error. This error is returned when the container is not registered, and a container without a CSP is registered.
If the smart card is unable to open the container, the smart card stores this information in the PIN cache and attempts to open the container again. This process continues until either the smart card finds the container or the Base CSP is forced to close the smart card handle. If the smart card finds the requested container, the container is opened using the PIN.
When a smart card is authenticated by the Base CSP, the Base CSP stores a list of containers the smart card can be used with. This information can be retrieved by the smart card, along with the PIN. The smart card can then be used to attempt to open the requested container.
If the handle does not match, then the Base CSP looks for a new handle. If one does not exist, the Base CSP closes the handle and returns an empty result. This return value is cached by the Base CSP, and is returned to the smart card for future operations.
The PIN cache uses a key called the PIN cache key. This key is stored in the smart card and must be used when calculating the signatures. The cache key is the same for all PIN cache entries, and a new cache key is generated for each new entry.
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