Connecting to a Cryptographic Service Provider
Each time an application is run, the first CryptoAPI function an application
calls is the
CryptAcquireContext function. This function returns to the application a handle to a particular
CSP. In addition, this handle specifies a particular key container within the
CSP. If the CSP has just been installed and no key containers yet exist, the
CryptAcquireContext function can also be used to create a new one.
When an application uses
CryptAcquireContext to obtain a CSP handle, it specifies a provider type and, optionally, a
provider name. If both a type and a name are specified, then the function looks for
a CSP with precisely the same type and name, loads it into memory, and returns
a handle to the application.
When an application calls
CryptAcquireContext specifying a provider type but no provider name, the function tries to find
the provider name, first on a list of default providers associated with the
logged-on user and, if that fails, from a list of default providers associated with
the computer.
Once the provider name has been determined successfully, the
CryptAcquireContext function searches for the CSP, loads it into memory, and returns a handle to
the application.
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