Driver failing to load, if Bcrypt library is used

Question

I want to use SHA256 hash in my driver, that I need to run on ARM64 platform.

After including bcrypt.h file in my driver source code and linking Bcrypt.lib. I used BCryptOpenAlgorithmProvider function in my driver source code.

When I load the driver, I get
"Windows cannot load the device driver for this hardware. The driver may be corrupted or missing. (Code 39)

Object Name not found"

Question 1. Can we use Bcrypt api for ARM64 platform or should it be used only for WIN32 platform?

Question 2. If it can be used for ARM64 platform, can someone point how to resolve the loading error?

Answer 1

Hello,
Welcome to Microsoft Q&A!

In ARM, The device drivers run in ring 0.
In ring zero, device drivers don't have access to Windows APIs: instead they have access to various NT kernel APIs.

Thank you.

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