The CryptoAPI Programming Model
The Microsoft Cryptographic Application Program Interface (CryptoAPI) is a set
of functions that allow applications to encrypt or digitally sign data in a
flexible manner, while providing protection for the user's sensitive private key
data.
All cryptographic operations are performed by independent modules known as
cryptographic service providers (CSPs). One CSP, the Microsoft RSA Base Provider,
is bundled with the operating system.
Each CSP provides a different implementation of the CryptoAPI. Some provide
stronger cryptographic algorithms while others contain hardware components such
as smartcards. In addition, some CSPs may occasionally communicate with users
directly, such as when digital signatures are performed using the user's
signature private key.
The CryptoAPI programming model can be compared to the Windows GDI model in
that the CSPs are analogous to graphics device drivers, and the cryptographic
hardware (optional) is analogous to graphics hardware. Just as well-behaved
applications are not allowed to communicate with graphics device drivers and
hardware, well-behaved applications cannot directly access the CSPs and cryptographic
hardware.
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